M. H. Yang

• Ph.D
• National Tsing Hua University

Nuclear fission reactions can release massive amounts of energy accompanied by neutrons and γ photons, which create a mixed radiation field and enable a series of reactions in nuclear reactors. This study demonstrates a one-pot/one-step approach to synthesizing radioactive gold nanoparticles (RGNP) without using radioactive precursors and reducing...

According to the mechanical characteristics of pile-net composite foundation of high fill section of soft soil subgrade under embankment load, this paper made an in-depth analysis of the load transfer mechanism from the top to the bottom. Firstly, embankment soil was simplified as an inside and outside column. Then, according to integral differenti...

This study aims to establish a (198)Au-radiotracer technique for in vivo tracing, rapid quantification, and ex vivo visualization of PEGylated gold nanoparticles (GNPs) in animals, organs and tissue dissections. The advantages of GNPs lie in its superior optical property, biocompatibility and versatile conjugation chemistry, which are promising to...

An improved finite bar element method was developed to reasonably analyze the pile foundation in high and steep slopes of mountainous region. Firstly, the influences of the "P-Δ" effect and the pile-soil interaction on the internal force and displacement were taken into account by amending the element stiffness matrix of finite element method of ge...

The stressed forces and deformations of piles under axial and lateral loads will become very complex when considering lateral displacements of liquefied soil mass caused by earthquake. In this paper, the foundation pile was divided into the non-liquidizing section, liquidizing section and embedded section according to the liquidizing degree of the...

In order to study the failure mode and bearing mechanism of double-pile foundation for pile-column bridge in high and steep cross slope, on the basis of the similarity theory, this study designed and accomplished model tests under complex loads from slope angle of 45°, 60° and 75°. The results indicate that the impacts of the combined loads at the...

With the site project as the prototype, indoor model of load-bearing test was designed for three kinds of bridge pile foundations in the high-steep transverse slope which was 45°, 60° and 75° respectively. Through the monitoring of the top displacement of pile, internal force of pile body and soil pressure around the pile, the load transferring law...

Compared with bridge piles in fat ground, the bearing mechanism of a pile-column bridge pier foundation in a high and steep slope mainly includes a steep slope effect and an embedded depth effect. Firstly, the residual sliding force of high and steep slopes is deduced based on the theory of limit equilibrium. Secondly, based on the force analysis o...

Many nanomaterials, such as quantum dots, nano-gold, nano-silver, nano-ZnO, etc., consist of metal components. When these metal-based nanomaterials are used for biological applications, their biological safety must be evaluated. The biological disposition (ADME: absorption, deposition, metabolism, and elimination) of these nanomaterials need to be...

A new method for calculating the settlement of group piles in non-homogeneous soils is presented in this study. Firstly, assuming the shear stiffness coefficient of the non-homogeneous soils grows exponentially with the increase of depth, the stress field caused by frictional resistant along piles is obtained by using the shear deformation method,...

The bridge piles in high and steep slopes not only bear the loads from the superstructure, but bear the residual sliding force and the resistance from the slope. The loads from the superstructure can be simplified as vertical loads, horizontal loads and eccentric moments, the interaction model of piles-soils-slopes and the equilibrium differential...

Although zinc oxide nanoparticles (ZnONPs) have been applied in nanotechnology, their kinetics and tissue distribution in vivo are unknown. Here we compared the kinetics and tissue distribution of 10 nm (65)ZnONPs, 71 nm (65)ZnONPs and (65)Zn(NO(3))(2) in mice after intravenous injection. The areas under the curves and the half-lives in the second...

The formation mechanism of P-Δ effect of bridge double-pile foundation in steep slope was analyzed. According to the theory of the earth pressure and the elastic foundation beam, a pile-soil interaction model was established on the basis of the reasonably simplified residual pushing force and soil resistance, and then the differential equation of t...

Aiming at the effect of piles-soil interaction on high pier stability, this paper, based on the equal force- effect principle, substituted pile foundation to a "pier-style + level spring" mode to simulate that effect, then a critical load calculation method considering the pier- piles-soil system under the vertical load was developed. And to valida...

Polycrystalline Si crystals grown by gas-assistedsolidification have been characterized by chemical and physical techniques with particular emphasis on carbon determination. The life time of this material appears to be not correlated with [0] or [C].

Pulsed Electron beam annealing of phosphorus implanted CuInS2 has been found to be an efficient method in p-type doping of CuInS2. A sheet resistance as low as 10.1 Ω/‮, a sheet carrier concentration as high as l.0 ×1016 cm−2, and a hole mobility as high as 499 cm2 /V.s have been obtained. The irradiation energy density for the best doping conditio...

The objective of this study was to investigate whether quantum dot 705 (QD705) disrupts the cellular antioxidant systems leading to hepatotoxicity in mice. Mice were intravenously injected with QD705 and then sacrificed at week 12 or 16. Homeostasis of antioxidant-related metals, antioxidant activities, induction of oxidative stress, and toxicity i...

Determining the contact area and the distributing law of contact force is the key to the calculation of the laminated beam. In this paper, the contact problem of laminated beam was constructed into a linear complementarity model so as to overcome some irrational conclusions of traditional analytical solution. Then, the general solving process of th...

The increasing uses of zinc oxide nanoparticles (ZnONPs) in coatings, paints, personal care products and many other products increase the possibility of the body's exposure to ZnONPs. Accurate and quantitative profiling on the tissue distribution and body clearance of ZnONPs, which is an important factor to clarify the acute and chronic safety conc...

In order to effectively calculate and analyse the stress and strain of pile in soft soil foundation, soil elastoplastic three-phase segmented model is adopted to calculate the pile-soil relative displacement and skin friction. Considering that pile and soil keep energy balance when settlement of foundation soil occurred, an energy balance formulati...

Understanding the properties that determine the distribution and behavior of trace impurities in Si wafers is critical to defining and controlling the performance, reliability, and yields of integrated microelectronic devices. It remains, however, an intrinsically difficult task to determine trace impurities in Si because of the minute concentratio...

A method has been developed based on an on-line isotope dilution technique couple with laser ablation/inductively coupled plasma mass spectrometry (LA-ICP-MS), for the determination of boron in p-type silicon wafers. The laser-ablated sample aerosol was mixed on-line with an enriched boron aerosol supplied continuously using a conventional nebuliza...

Inorganic arsenic (iAs) is carcinogenic to humans. Methylated metabolites of arsenic (As) found in the urine could serve as potential tools for screening and early detection of cancer in populations exposed to As. Relatively little information is available regarding changes in As methylation profiles after cessation of As exposure. We examined the...

Arsenic-metabolism-related genes can regulate the arsenic methylation process and may influence susceptibility to cancer. We evaluated the roles of arsenic metabolism genes on urinary arsenic profiles of repeated measurement with 15-year follow-up (1988-2004) through general linear model (GLM) and assessed the effect of the changed extent of urinar...

Inorganic arsenic has been linked to decreased kidney function through oxidative damage. Arsenic methylation is believed to be a pathway for arsenic metabolism. Lycopene is an antioxidant that reduces oxidative stress; however, the association between urinary arsenic species, plasma lycopene level, and chronic kidney disease (CKD) has seldom been e...

QD705 is a cadmium/selenium/tellurium (Cd/Se/Te)-based quantum dot with good potential for biomedical applications. Although the biological fate of QD705 is established, its chemical fate in the biological system is still unknown. Since the chemical nature of Cd in QD705 (either stays as bounded Cd or becomes free Cd) is closely related to the toxi...

Long-term exposure to inorganic arsenic from artesian drinking well water is associated with carotid atherosclerosis in the Blackfoot Disease (BFD)-hyperendemic area in Taiwan. The current study examined the arsenic methylation capacity and its risk on carotid atherosclerosis. A total of 304 adults (158 men and 146 women) residing in the BFD-hypere...

Arsenic exposure is associated with an increased risk of bladder cancer. To explore the distribution of the arsenic methylation capability and myeloperoxidase (MPO) and sulfotransferase (SULT) 1A1 genotypes in patients at different stages and grades of urothelial carcinoma (UC), 112 UC cases were recruited between September 2002 and May 2004 for th...

The roles of metal ions to sustain normal function and to cause dysfunction of neurological systems have been confirmed by various studies. However, because of the lack of adequate analytical method to monitor the transfer kinetics of metal ions in the brain of a living animal, research on the physiopathological roles of metal ions in the CNS remai...

To elucidate the influence of folate concentration on the association between urinary arsenic profiles and urothelial carcinoma (UC) risks in subjects without evident arsenic exposure, 177 UC cases and 488 controls were recruited between September 2002 and May 2004. Urinary arsenic species including inorganic arsenic, monomethylarsonic acid (MMA(V)...

The risk of urothelial carcinoma (UC) and urinary arsenic speciation have been evaluated in a few case-control studies; however, the association has not been verified in a prospective cohort study. The aim of this study was to examine the association between urinary arsenic speciation and the incidence of UC in a cohort study. A total of 1,078 resi...

Arsenic exposure is associated with an increased risk of urothelial carcinoma (UC). To explore the distribution of the arsenic methylation capability in patients with different stages and grades of UCs, 100 UC cases were recruited between September 2002 and May 2004 for this study. Urinary arsenic species, including inorganic arsenic (As(III) + As(...

We have developed an on-line analytical system involving microdialysis (MD) sampling, a carbohydrate membrane desalter (CMD), and an inductively coupled plasma mass spectrometer (ICPMS) system for the simultaneous determination of multiple trace metals in the extracellular fluid (ECF) in the brains of anesthetized rats. The microdialysate that perf...

Arsenic exposure is associated with an increased risk of urothelial carcinoma (UC). To explore the association between individual risk and urinary arsenic profile in subjects without evident exposure, 177 UC cases and 313 age-matched controls were recruited between September 2002 and May 2004 for a case-control study. Urinary arsenic species includ...

Cumulative arsenic exposure (CAE) from drinking water has been shown to be associated with hypertension in a dose-response pattern. This study further explored the association between arsenic methylation capability and hypertension risk among residents of arseniasis-hyperendemic areas in Taiwan considering the effect of CAE and other potential conf...

Based on the metal plastic forming principle and the characteristic of spinning, a new spinning technology for forming thin-walled inner meshing gear was presented. In the paper, a 3D finite element elastic-plastic model had been used to analyse the spin-forming of the gear. The strain distributions and the metal flowing rules in different directio...

Based on 3D ELASTIC-PLASTIC theory, a finite element model has been established to analysis the spin-forming of the oblique tubes by the finite element software, MSC. MARC. In this paper, the distribution characteristics of the spinning force of the oblique tubes is presented, the effects of processing parameter on spinning force are also explicate...

Long-term exposure to ingested inorganic arsenic is associated with peripheral vascular disease (PVD) in the blackfoot disease (BFD)-hyperendemic area in Taiwan. This study further examined the interaction between arsenic exposure and urinary arsenic speciation on the risk of PVD. A total of 479 (220 men and 259 women) adults residing in the BFD-hy...

A novel on-line microdialysis sampling coupled with flame atomic absorption spectrometry (FAAS) with an attractive application is reported. Microdialysates perfused through implanted microdialysis probes were directly introduced into the flame atomizer of a FAAS system using 0.2% HNO(3) as carrier solution at a nebulizer uptake flow rate of 6mlmin(...

An approach based on utilization of epithermal neutron activation analysis (ENAA) is proposed for determination of trace Al in silicon carbide (SiC) materials. The feasibility and restrictions of the ENAA were evaluated in terms of the associated uncertainties that resulted from counting and from propagation in calculations. Experimental measuremen...

A direct, rapid and continuous in vivo monitoring of diffusible calcium in the blood of living rabbits has been developed using microdialysis sampling coupled on-line with flame atomic absorption spectrometry. Microdialysates perfused through implanted microdialysis probes were collected with a sample loop on an injection valve and directly introdu...

An on-line microdialysis sampling coupled with flow injection (FI) electrothermal atomic absorption spectrometry (ETAAS) method has been developed for in vivo monitoring of extracellular diffusible Mn in brains of living rats. Microdialysates perfused through implanted microdialysis probes were collected with a sample loop of an on-line injection v...

A study was conducted to measure the arsenic species in farmed mouthbreeder (Oreochromis mossambicus) and culture ponds in water in blackfoot disease (BFD) hyperendemic areas in Taiwan. The relationships between arsenic species of aquaculture ponds and farmed fish were also explored. Biota samples were extracted with methanol/water (1/1, v/v) using...

The performance of conventional and low-flow nebulizer systems with liquid chromatography in differentiating four arsenic species in urine was evaluated. Two low-flow (DIN and MCN) chamber assemblies and a conventional (CFN) nebulizer-spray chamber assembly were compared in the hyphenation of anion-exchange microbore liquid chromatography with indu...

The objective of this study was to assess individual variation in inorganic arsenic methylation capability and the association between selenium levels in urine and blood, and inorganic arsenic methylation capability among residents of the Lanyang Basin who drank groundwater and were exposed to high concentrations of inorganic arsenic. According to...

Arsenic contamination of groundwater can occur by natural leaching of minerals and by human activities. In aquatic environments, arsenic usually exists in +3 and +5 oxidation states, both as inorganic and organometallic species. Inorganic arsenite is more toxic than arsenate which in turn is more toxic than monomethylarsonic acid and dimethylarsini...

An on-line and fully automated method was developed for the continuous and dynamic in vivo monitoring of four arsenic species [arsenite (AsIII), arsenate (AsV), monomethylarsonic acid (MMA) and dimethylarsinic acid (DMA)] in urine of living organisms. In this method a microdialysis sampling technique was employed to couple on-line with high perform...

AbstractA method for direct de termination of total in organic arsenic (III+V), arsenic (III) and dimethylarsinate (DMA) in sea water was developed by combining continuous‐flow selective hydride generation and inductively coupled plasma mass spectrometry (ICP‐MS) is presented. The principle underlying selective hydride generation is based on proper...

A high-throughput method involving laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) was developed for the determination of critical elements in semiconductor photoresist samples. An innovative procedure, including a sequence of spiking, mixing, spin-coating, and baking, was developed for the preparation of photoresist film st...

A method for the determination of the dopant concentration of tellurium in dissolved indium antimonide semiconductor material by electrothermal atomic absorption spectrometry (ETAAS) was developed. Efforts were made to investigate the optimal conditions of the furnace heating program and the effect of palladium modifier on the variation of telluriu...

A study was made of the possible mechanism of tellurium atomization with the use of palladium and palladium–magnesium nitrate as chemical modifiers in electrothermal atomic absorption spectrometry (ETAAS). The experiments were performed by adding various masses of Pd and Pd–Mg(NO3)2 to the standard solution of tellurium and then injecting them into...

A new approach to matrix modification, in which polyhydroxy compounds (polyols) were used as complexing agents, has been evaluated for the determination of trace elements (B, As, Se, Sb, Cr and Mo) by electrothermal vaporization inductively coupled plasma mass spectrometry (ETV-ICP-MS). The effects of eight kinds of polyhydroxy compounds on the sen...

The comparative determination of barium, copper, iron, lead and zinc in tea leaf samples by two atomic spectrometric techniques is reported. At first, slurry sampling electrothermal atomization atomic absorption spectrometry (ETAAS) was applied. The results of Ba and Pb determination were calculated using the method of standard additions, and resul...

Indium antimonide was washed with acetone, etched with 1M-HCl, rinsed with H2O and dried in air, and a 1 g portion was ground to a particle size of ≤3 µm. Then a 2.5-40 mg sub-portion in a 2.5 ml polyethylene phial was treated with 2 ml of 0.005% Triton X-100 solution in 0.2% HNO3. The slurry was sonicated and the phial was placed in the autosample...

A neutron activation analysis method for the determination of Au, Co, Cu, Fe, Hg and Zn in high purity silver materials with prior isolation of the analytes by a two-step selective precipitation separation from the silver matrix was developed. In the first step, the silver matrix was separated from the trace impurities of interest through the addit...

In order to elucidate whether urinary levels of inorganic and organic arsenic metabolites are associated with previous exposure to high-arsenic artesian well water, a total of 302 residents of age 30 yr or older were recruited from three arseniasis-hyperendemic villages in Taiwan. Most study subjects had stopped consuming high-arsenic artesian well...

A new analytical procedure for the direct determination of metal impurities in aluminium oxide by ultrasonic slurry sampling–electrothermal vaporization–inductively coupled plasma mass spectrometry (ETV–ICP-MS) is reported. The elements studied include Cr, Cu, Ga, Fe, Mg, Mn, Na, V and Zn. Two samples of fine alumina powder (including the certified...

Manganese is an essential element but it may result in a toxic event if the workers are excessively exposed to this element. Monitoring of biological Mn exposure is therefore important. The careful preparation for Mn analysis is necessary. In order to get a correct protocol for sampling and storage of the biological samples, identification of the p...

The study of the composition of human milk has attracted worldwide interest, since it represents the pattern of nutrients most suitable for the younger infant. In the present study, the concentration of Ca, Mg, Fe, Cu, and Zn was measured in a total of 211 samples of human milk. The analytical technique of inductively coupled plasma atomic emission...

Slurried sediment and soil samples of the certified reference materials with a highly elevated level of the metals of interest (Mn, Cr and V) were analysed by electrothermal atomic absorption spectrometry (ETAAS) with Zeeman effect background correction. The method of slurry preparation and time-temperature programmes were optimized and, finally, t...

The analytical conditions of the direct determination of bismuth in some certified reference material samples (soil and sediment) by slurry sampling Zeeman electrothermal atomic absorption spectrometry (ETAAS) with the use of automated ultrasonic slurry mixing are discussed. Palladium nitrate was used as a chemical modifier. With the use of this mo...

A fully automated on-line sample pretreatment system combining microwave digestion with sample preconcentration/matrix separation for the determination of trace metals (Fe, Ni, Cu, Zn, and Pb) in blood and serum samples by inductively coupled plasma mass spectrometry (ICPMS) was designed and evaluated. The samples were mixed with an appropriate rea...

Cobalt and nickel were determined in slurry samples of soils and river sediments by electrothermal atomization atomic absorption spectrometry (ETAAS) with Zeeman effect background correction. It is suggested that cobalt and nickel can be determined simultaneously by slurry sampling ETAAS. The results of determinations with the use of slurry samplin...

A new method of efficient rotating gold-film glassy-carbon electrode preparation prior to the determination of As(III) and As(V) in seawater by anodic stripping voltammetry (ASV) is described. Factors affecting sensitivity and precision including pH, deposition time and potential, rotation and scan rate, and the nature of working electrode were inv...

To elucidate the associations of arsenic-induced skin cancer with serum beta-carotene level and arsenic methylation capability, a total of 654 residents of age 30 or older were recruited from three arseniasis-hyperendemic villages in Taiwan and regularly examined for skin lesions during the follow-up period. There were 33 cases affected with newly...

In order to elucidate the relationships among arsenic methylation capacity, body retention, and genetic polymorphisms of glutathione S-transferase (GST) M1 and T1, a total of 115 study subjects were recruited from Lanyang Basin located on the northeast coast of Taiwan. Specimens of drinking water, blood, urine, hair and toenail were collected from...

A simple and rapid method for the determination of some trace element impurities in high purity silver, combining the isolation of analytes from the silver matrix with selective precipitation followed by ICP-MS determination was developed. On the basis of an extreme difference in the solubilities of the chlorides of silver and the other accompanyin...

A microwave-assisted digestion system enabling simultaneous treatment of thirty-six samples with oxidizing acidic media in double-closed vessels was devised. Aluminum was subsequently separated from the digested solution through solid phase extraction by prior reacting with 8-quinolinol and adsorbing onto the simple XAD-4 resin column. In the separ...

A gas-liquid separator is described in which the liquid-exit of a sleeved tubular microporous PTFE membrane leads into a U-shaped separator so that residual hydride diffusing out of the liquid can be combined with that emerging from the gas-exit of the sleeved membrane. The length of the PTFE tubing and the ratio of the tubing i.d. to the wall thic...

 A method is proposed which involves sample pretreatment followed by electrothermal atomic absorption spectrometry (ETAAS) for determination of cadmium in human urine. A microwave digestion system was devised to accommodate double-closed vessels for simultaneous digestion of batches of up to 24 urine samples in about 20 min. After digestion, matrix...

A novel method of in-situ conversion of inorganic mercury to organic mercury combined with the supercritical fluid extraction of the organic mercury by supercritical carbon dioxide is proposed. The removal of inorganic mercury and/or organic mercury from cellulose matrix was accomplished with very good efficiency. An analytical procedure including...

The results of a series of inter‐laboratory cross‐check on the determinations of ppb and sub‐ppb levels of copper and lead in environmental samples are described. Thirteen laboratories participated during a five‐stage comparison. Seven analytical methods and two pre‐concentration procedures were performed on certified and real samples. For controll...

In this work, we propose a method to determine trace amounts of Cd in human whole blood samples by electrothermal atomic absorption spectrometry (ETAAS) with the combined chemical modifier including magnesium chloride and sodium hydroxide. Prior to the ETAAS analysis, dissolution of the blood samples is accomplished using a HNO3‐HClO4double closed‐...

A method was developed for the determination by inductively coupled plasma mass spectrometry of germanium, arsenic and selenium in urine and blood after microwave acid digestion and on-line anion-exchange separation. After acid digestion, the analytes exist mainly as H2GeO3, H3AsO3, H3AsO4, H2SeO3 and H2SeO4 in the resulting sample solution. Separa...

A method for the determination of trace impurities of phosphorus and arsenic in trichlorosilane with prior separation followed by electrothermal vaporization inductively coupled plasma mass spectrometry (ETV-ICP-MS) has been developed. The preconcentration of the analytes from the sample matrix was made by adding cuprous chloride to a 10 mL trichlo...

Blackfoot disease is a peripheral vascular disease resulting in gangrene of the lower extremities. Although extensive epidemiological study has implicated high arsenic content in artesian well water in the endemic area, there is more to learn about the etiology of the disease. In this study, effort is paid on multielement determination and arsenic...

A microwave digestion method utilizing an acid mixture of HNO3–HClO4–HF (3 + 5 + 2 v/v) in closed vessels was developed for the determination of major, minor and trace elements in very small amounts of airborne particulate matter collected on Teflon filters by a dichotomous sampler, and was tested on NIST Standard Reference Material (SRM 1648 Urban...

The possibility of improving the detection sensitivity for boron with the use of mannitol as a chemical modifier in electrothermal vaporization inductively coupled plasma mass spectrometry (ETV-ICP-MS) is presented. Experiments were performed by adding mannitol to a boron analyte solution to form a boron–mannitol complex and then injecting the resu...

A method is described which combines radiotracer techniques with paper electrophoresis to investigate the optimal decomposition conditions for zinc and selenium in rice leaf and grain samples. After administration of the respective nuclides of Zn-65 and Se-75 solutions to the rice, samples of the tested rice are harvested and decomposed with a nitr...

The groundwaters collected from three wells in the Blackfoot disease (BFD) area in southwest Taiwan contain, on the average, 671 149 [mu]g of total dissolved arsenic/L. The arsenic contents in the well waters of Hsinchu, a city in the northwest of the island where no BFD has ever been reported, are less than 0.7 [mu]g/L. The predominant arsenic spe...

A one-step Mannich reaction has been developed for the immobilization of 8-quinolinol on aminopropylsilica gel that results in a product exhibiting a capacity of 466 ± 20 μmol g−1 for copper(II) ions. Capacity measurements were made by copper(II) uptake and elemental analysis. Characterization of the silica bound ligands in this synthetic context i...

The coupling of an on-line column preconcentration manifold with continuous flow ultrasonic nebulizer equipped with a desolvation system for simultaneous determination of metal ions by inductively coupled plasma atomic emission spectrometry (ICP-AES) is described. The silica-immobilized 8-quinolinol prepared by an improved synthetic route has been...

Blackfoot disease is a peripheral vascular disease resulting in gangrene of the lower extremities. Though extensive epidemiological study has implicated that high arsenic content in artesian well water of the endemic area, bears some important connection with the disease, the etiology of the disease is still unknown. In this study, attention is pai...

A simple and quantitative method for separating antimony(III) from antimony(V) by coprecipitation with thionalide is described. The total concentration of antimony is determined through addition of tin(II) chloride followed by thionalide coprecipitation and antimony(V) is determined by substraction. The coprecipitation system was investigated with...

The elemental composition and trace element impurities are known to be two important factors which greatly influence the physical properties of compound semiconductor materials. For stoichiometric analysis of compound semiconductors, high precision and accuracy with an error of less than or equal to 0.5% are prerequisite. Chemical methods, especial...

Spectrophotometric methods for the determination of boron in the low g/g and ng/g range in high-purity silicon and dichloro- and trichlorosilanes were investigated in detail. The procedures established involve dissolution of silicon samples and the hydrolyzed products of chlorosilane samples in hydrofluoric acid-containing reagents followed by evap...

A two-step method for the determination of CrVI and CrIII in natural waters was developed. The method is based on the variation of the coprecipitation yields with Pb(PDC)2(PDC = pyrrolidine dithiocarbamate) as a function of pH. By using two different pH values both species can be determined separately. Firstly, CrVI was coprecipitated at pH 4.0 and...

The concentrations of ten trace and dopant elements in GaAs semiconductor were determined by reactor neutron activation analysis after removal of As by evaporation of AsCl3. The retentions of the elements of interest were measured using radiotracers. The concentrations of doping elements (Te, Cr and Zn) in commercial GaAs samples were compared to t...

The coprecipitation of trace elements from natural water samples by Pb and Bi salts of pyrrolidine dithiocarbamate or Bi salts with oxine and thionalide was studied with radiotracers. The concentration of the trace elements in samples of sea water was studied by coprecipitation followed by neutron activation analysis.

A method combining radiotracer techniques with paper electrophoresis to investigate the optimal decomposition conditions for cobalt, copper, selenium, and zinc in rat liver samples is described. After oral and intraperitoneal administration of the respective nuclides of 60Co, 64Cu, 75Se, and 65Zn solutions, the livers of the tested rats are removed...

Four kinds of gallstones from 40 patients have been analyzed for the presence of a total of 18 elements by instrumental neutron activation analysis. Of these elements, Ca, Mg, Fe, Co, Zn, Na, and Cl are found in the core of all types of stones. The differences in elemental composition of the various types of stones as well as the differences in the...

Methods are described for the determination of trace elements in Si and chlorosilanes by inductively coupled plasma atomic emission spectrometry (ICP-AES) and neutron activation analysis. The chlorosilanes were hydrolysed and Si was removed as SiF4 by evaporation of an HF solution. The dependence of the ICP signal on several parameters was studied...

The multi-element analysis of airborne particulate matter collected on glass-fibre filters by various acid mixture digestion procedures and inductively coupled plasma atomic emission spectrometry (ICP-AES) was studied. In order to achieve sensitive and reliable multi-element analyses, the analytical blanks obtained as a result of the dissolution of...

The depth profile of phosphorus concentration in phosphorus-doped silicon was shown to be measureable with an accuracy of 1–3% by the use of liquid scintillation counting after neutron irradiation. Both the amount of Si and P are determined by neutron activation analysis followed by liquid scintillation counting for 1–5 hours after the end of irrad...

CuInS2 is one of the important I–III–VI2 ternary compounds which has in recent years received increasing interest in semiconductor science. In this study an electrochemical method has been developed based on a limited amount of available sample (0.5–10mg) for the precise and accurate determination of CuInS2 composition. After decomposition of the s...

CuInS2 thin films were prepared by three-source evaporation. Special features of the system design are described. The material characterization by compositional, photoluminescence and electrical analyses are reported. Both p and n films were produced: the resistivities were between 0.01 and 10 ω cm, the grain size was between 2 and 8 Ωm, the best e...