Elemental Analysis - Science method

When EDX can be used under all conditions, why XRF need to be used. Or why people buy XRF instruments.

Even though both the techniques use different sources viz., electron (EDX) and X-ray (XRF), both the analysis are dependent on their characteristic X-rays for elemental analysis. Why their is difference in the detection limits and sensitivities.

I conducted elemental analysis for some agricultural wastes for use in the production of bio-oils. The C,H,N,S,O have been determined but need to calculate the H/C and O/C ratios.

We are currently developing a BFT system. It is necessary to measure the C:N ratio level in BFT. Imhoff cone techniques are used only to observe floc density.

However we prefer to measure the C:N ratio in the BFT rather than using elemental analysis. Can anyone suggest if there is a device or kit available?

Hello,

I am trying to find the H/C effective ratio from waste cooking oil and LDPE feedstock. i conducted already the elemental analysis and got the element percentage. I found the formula:

H/Ceff= (H-2*O-3*N-2*S)/C

however this are moles, may i know if someone have experience with this or know how to find this ratio?

Thanks in advance

As the article reported,

Reaction Yield= m_purified^*w%/n_*M_Pb

where mpurified is the mass of the dried quantum dots, w% is the mass

percentage of lead (28.74 %) [by inductively coupled plasma optical

emission spectroscopy (ICP-OES) elemental analysis], n is the number of

CsPbBr3 quantum dot moles, and MPb is 207.

n should be the moles of Pb precursor according to "The reaction yield is assessed in terms of Pb present in the DBSA-QDs compared to the Pb precursor."

mineral element analysis

WHEN WE DONE THE ELEMENTAL ANALYSIS OF THE BLACK SPOT AREA THE CHROMIUM CONCENTRATION INCREASES. CAN ANYONE PLEASE TELL ME WHAT IS THE REASON BEHIEND THE INCREASE IN THE CHROMIUM CONCENTRATION PARTICULARLY AT THE BLACK SPOTS.

Can you please explain the type of steel mentioned in the elemental analysis above

Porphyrin-fullerene dyads have been there for quite a few decades now and have applications in diverse fields ranging from medicine to energy applications, and as energy storage devices. A variety of methods are available for accurate characterization of such dyads, such as, 1HNMR, Mass Spectra (HRMS or MALDI-TOF), XRD among others. While it is understandable that 1HNMR is a mandatory criterion in combination with mass spectra to characterize the structural features of such systems. The question is what role does 13C NMR play here? or HRMS? These are macromolecular systems and getting accurate 13C spectra is a near to impossible task, the same applies to HRMS as well, and elemental analysis. There are numerous publications on the synthesis of porphyrin-fullerene dyads which do not report, in other words cannot report analysis results such as 13CNMR or elemental analysis or HRMS. Is it fair then to impose 13CNMR/HRMS/elemental analysis as a mandatory criterion for complete characterization of such macromolecules? Shouldn't the standards be different than that for small molecules considering the sheer size and structural complexity? I believe a clean NMR and MALDI-TOF analysis is more than sufficient to establish the structural identity of such molecules. I would love to know the opinion of the scientific community on this matter.

For electrodeposition of metals on a small SS disk at trace level I used XPS to know whether the the deposition was in metallic form or it was in compound form. In XRF, I did not get such information. Will you please explain me the reason behind it?

I need, how many elements are present in the sample and how to find out from the sample.

Do anyone understand how the author determine the Chemical formula and vacancy from the elemental analysis?

If instruments are good please mention the name.

According to my view, even the mere opening of a drawer or a cupboard is already damaging to cultural remains. The shock of opening a drawer, the changing environment between the inside and the outside of a drawer, as well as a sudden light that falls on an artifact that has been in the dark is damaging to any item, especially to parchment, papyrus and paper.

When it comes to 'taking a sample' needed for applying a analytical technique to an artifact, one can only speak of less and more destructive, because destructive it is.

For example in Neutron Activation and Petrography, one needs either an amount of 80 mg of pottery powder or a thin-section before submitting the sample either as powder or as a pellet to a nuclear reactor or to a glass slide to be looked at under a microscope.

I think that the formula "non-destructive sampling technique" was invented by scientists to obtain samples they needed from a curator or conservator. I, therefore, suggest to omit the word "non-destructive" from the Cultural Heritage vocabulary.

I'm doing an elemental analysis of soils using an XRF Analyzer, the results obtained are in ppm. My question is, can I directly convert values from ppm to mg/Kg of soil?

I mean, identifying the presence of some complex unknown compounds, not just finding the crystalline phases!

Moreover, I have the XRF result of the mentioned compound (elemental analysis) and the existence of crystalline phases. However, I need to know if it is possible to characterize the probable complex compositions.

Thank you in advance for your help

Dear scholars,

I have a database with 100 geolocated samples in a given area, each sample contains 38 chemical elements that were quantified.

Some of these samples contain values Below the Detection Level of the instrument (BDL), clearly, when we have 100% of the samples with BDL values there is not much to do, but what can be done when, for example, when there is only 20% BDL, what do we do with them, with what value do we replace a BDL sample?

Some papers show that a BDL sample can be replaced by the detection level (for the instrument's minimum detection level for that chemical element) divided by 0.25, others show that you have to divide it by 0.5... What would you do in each case, and is there any literature you would recommend? If it matters, I am mostly interested in Copper and Arsenic.

Regards

How do I calculate the ratio e / a (eletron/atom) for a metallic alloy with more than two elements?

I want to do plant experimental studies of wheat. Prior to this, I have done soil elemental analysis of primary nutrient and organic carbon. In 1 gram of soil , they are as follows:

N = 0.007 %

P= 0.00024 %

K= 0.00002 %

Organic carbon = 0.0025%

Organic matter = 0.0043 %

pH = 6.5

Now, I want to compare that is this alright to start the experiments or they are nnutrient deficient soil? How to compare with recommended level of soil. Kindly help

Nitrogen peak areas of 6 out of 10 blank samples (synthetic quartz) are below the lower working range. I am afraid the estimate of the limit of detection (LoD) might not be realistic.

The mean value of the 10 blanks is 41.5 (42 is the lower limit of the range).

"In case the noise peak in the blank sample is not measurable, the peak relative to the lowest concentration of the calibration curve can be used, provided its value is comparable to LOD. In this case, the LOD will be simply 3 times the standard deviation of the lowest concentration level, as mean blank is considered as zero."

From: Bratinova, S., Raffael, B., & Simoneau, C. (2009). Guidelines for performance criteria and validation procedures of analytical methods used in controls of food contact materials. JRC Scientific and Technical Reports, EUR, 24105.

Does that mean I can take the mean blank value to be 42 since that is the lower noise peak for N and to calculate LoD add three times the standard deviation of the 4 readings that are above 42?

Please give me your thoughts on this. I am a student trying to understand more about the analytics behind elemental analysis.

Every reply will be greatly appreciated.

Hi everyone, I want to obtain the elemental composition of a thin film coated on a gold surface. What I need to prove is that the presence of sulphur in the thin film. Which analysis gives better proof? SEM-EDX or XRF?

I have synthesize Nickel cobaltite through various methods. I have gone through XRD and EDS, But I still wonder what preliminary test/characterization can be performed to support the elemental composition is 1 :2 :4 for Ni: Co: O.

I have to justify that Co is 2.

How do I use the CHN methodology liquids? Does anyone have a paper that describing this methodology?

Using Elemental Analyzer to measure Soil Total Carbon (STC), Soil total nitrogen (STN), C/N ratio, total sulfur content is a good technic. Sulfanilamide usually used as standard for machine calibration and after every ten measurements. How we can ensure the accuracy of the data after analysis?

I have functionalized a material with an organic compound and performed different analyses such as TGA, XPS, elemental analysis (by EDS and varioMICRO) but I have a difficulty to determine the general formula. Is there any equation?

Most of the journal articles show that the plasmon peak of silver nanoparticles exists at the wavelength range of 400-500 nm. However, what I get is at around 550 nm (the AgNPs were synthesized through chemical reduction of silver nitrate by sodium borohydride with the presence of dodecylamine as capping agent). The formation of AgNPs has been confirmed by other elemental analysis (XRD,EDX). So I am not sure that does the peak presences at the wavelength of 550 nm is attributed to AgNPs or not?

Dear Experts:

In the absence of elemental analyzer and XRF, Is it possible to calculate composition of compound elements from the compound formula listed in crystallographic data?

If there is any formula or software that can assist, please clarify.

Is EDX-FS sensitive enough to quantify the available and total micronutrients (Fe, Mn, Zn, and Cu) concentration in soil and plant samples?

Is EDX-FS accurate in terms of nutrients/elements analysis when we compare it with wet-analytical methods?

Can carbon, nitrogen, phosphorus and potassium (both total and available form) be measured accurately in soil and plant samples using EDX-FS? And based on its results can we calculate fertilizers recommendations for the particular crop?

Is EDX-FS sensitive enough to quantify the available and total micronutrients (Fe, Mn, Zn, and Cu) concentration in soil and plant samples?

Is EDX-FS accurate in terms of nutrients/elements analysis when we compare it with wet-analytical methods?

Can carbon, nitrogen, phosphorus and potassium (both total and available form) be measured accurately in soil and plant samples using EDX-FS? And based on its results can we calculate fertilizers recommendations for the particular crop?

For example in one research article the Elemental analysis values of COF-TpPa-1 ( Triformylphloroglucinol (Tp) (63 mg, 0.3 mmol), Paraphenylenediamine (Pa-1) (48 mg, 0.45 mmol) are as follows

Anal. Calcld. For C80O12N13H48 : C, 69.5; H, 3.47; N, 13.87; found : C, 65.7; H, 3.32; N, 12.71

I've prepared some metal composites based on transition metal oxides. How may I be able to digest the sample in order to have elemental analysis?

I've prepared some metal composites based on transition metal oxides. How may I be able to digest the sample in order to have elemental analysis?

I have great differences between duplicate digestions of sewage sludge, but only for some elements like Fe and P.

l use closed vessel microwave digestion with HNO3 and H2O2.

Usually the "failed" duplicates have a much lighter colour compared to the usual yellow solution and they have a fraction of the concentration for certain elements. Sometimes the same sample produces multiple failed duplicant, and sometimes none.

l checked the acid dispensers, the loss of mass during digestion and the microwaves, but no correlation so far.

l have trouble investigating the problem beacuse of its apparent randomness. l tried running a study on the effects of different digestion parameters with a sample that had previously produced the issue. But no major effect that is comparable to the main problem was discoverd.

Hi there,

we want to press pellets from different soil samples (powdered in advance) in order to use them for total element analysis via XRF.

In advance, we tried to produce pellets from certified reference material which is very finely powdered. We used Licowax Micropowder as binding addidive but never got satisfying results after homogenization - there were always white dots (wax) remaining. We used both homogenization "by hand" in a mortar and homogenization in a Retsch Mixer Mill (30 min., frequency: 20, using agate balls).

Can anyone suggest a good way of preparing XRF pellets from reference material (e.g. sewage sludge) or natural soil samples?

Thank you in advance!

I am working on the development of an elementary impurities method for an API by acid digestion via microwave and ICP-OES analysis. [API = Amiodarone HCl]

However, at the end of the microwave program, I notice that a platinum / black solid is impregnated in the Teflon tube. I figured it could be the iodine from API composition, that is not soluble in acid reagents.

Has anyone worked with the analysis of elemental impurities for a compound with a high concentration of iodine and can you help me with this? (microwave digestion)

Could the solid on the wall of the Teflon tube be the iodine?

Would add AgNO3 for precipitation work in this case?

Would it be correct to let the solid form on the tube wall and proceed with a simple filtration of the solution?

I synthesized some (metallo) porphyrins. I am now characterizing them by Mass spec and also confirming their purity by Elemental analysis. The values I got are a little deviated from the calculated values. What is the allowed limit of deviation for mass spec and elemental analysis in porphyrin chemistry? I will appreciate some references too. Thank you.

Following elemental analysis of two osteoma samples using XRF spectroscopic & MPAES techniques, I have detected Nickel in both the samples; whereas in native bone sample of the same species from same geographical area was found without presence of Nickel.

After elemental analysis of the samples, carbon content of the charcoal was 102 (several repetitions were made, but obtained the same values), the equipment was tested with other samples of wood obtained coherent results (the equipment is working well). How can I adjust the elemental composition values since the sum of C,H,N,O and ash should be 100?

Here, I mean the accuracy and the major differences.

I prepared an activated carbon by chemical activation process using H3PO4 as activating agent, the pHpzc of this carbon is 6, I analyzed this carbon by elemental analysis and by TPD to know its composition. I had different results on oxygen contents

For TPD the oxygen content is around 11.5 %

For elemental analysis the oxygen content is around 36 %

While elemental analysis of the canine uroliths by energy dispersive X-ray (EDX) spectroscopy; on weight basis, we have detected Gold (Au) 23.46% in sample 1, 28.25% in sample 2, 9.46 % in sample 3, 9.25% in sample 4 and 6.11% in sample 5. Is it a normal findings

Extracted chitin was subjected to Kjeldahl method, the result of nitrogen level obtained was 1.7 % ; however, EDX elemental analysis present various values of nitrogen form 3 to 6 %.

How can we explain this difference?

is each method present specific meaning of percentage?

I recently submitted my samples to a laboratory for ICPOES, I am only provided with Standard Deviation and Mean data of one element out of two. I want to know if there is any spectra that is generated during the process?

Hi everyone,

i would like to extract some elements and molecule from soil for an Continuous-Flow Analysis (Futura, AMS Alliance) but for these analysis I only have very little material (about 0.1g). It is dust from the Sahel as part of a project on erosion. I want to analyze PO4 (Olsen extraction method and colouring of a phosphomolybdic complex ), NH4 (2M KCl extraction, Salicylate method on CFA), total phosphorus (HCl method) and NO3/NO2 (2M KCl method, cadmium reduction method). For quantification Do you think I can do these analysis with so little material? I’m open to advice.

Thank you so much

for my bachelor project I did some measurements on solid polymeric samples with an handheld XRF (X-MET8000 optimum). data of 13 different samples where collected, the data contained information about the measured concentration and 95% confidence interval. (see file)

I am not sure which validation/statistics/… method i can use to make a discission out of these results. i was thinking about an analysis of the average but then i do not know what to do with the 95% B.I.

it would be wonderful if anyone could help me with finding an appropriate method to process these results

I often have troubles obtaining adequate elemental analysis for iridium compounds when the ligand is triflate (CF3SO3), hydrogen and nitrogen work well but carbon is usually about 5% lower and sulfur values are random, even in samples from the same batch. Does anyone know if this is frequent? Are there any references to problems in the analysis when there is sulfur in the organometallic samples?

Hi i am working with PSI(pipe soil interaction) elements in abaqus. i am getting an error message as "The elements have been identified in element set ErrElemMissingSection. " i have included pipe-soil keyword in the keyword editor also. what should i do?

I have to work with Aluminium foil (8079alloy- 38 micrometer thickness) , in the last months we encountered an adhesion problem between the aluminium and the coating materials (primer), so I think the problem is that the foil has some traces of rolling oil or other slipping addition from the source of the aluminium ! but how to make a test to be sure about this hypothesis .. I have a simple laboratory with no elemental analysis instruments.

We are developing a general method for Q3D elements by ICP-MS, out of all Q3D elements Au shows inconsistency in spike recoveries and bracketing standard recoveries. We are using 2% Nitric acid and 0.5% HCl in water(Trace elemental grade) as diluent. Au was analysed against Y and Tb as internal standards, results remain same. Some times we were getting recoveries with in limit (70% to 150%) with the same conditions the other time recoveries fell short. The reason for this is Au is not stable in HNO3 and HCl? or is there any other reason? and what would be the optimal conditions to get consistent results? (We are not using any glassware for sample preparation, we only use Poly propylene tubes throughout the analysis.)

the sample is a mixture of activated sludge with agricultural residues that have been subjected to anaerobic digestion for 40 days in order to biomethane production.

For the determination of percentage of limestone in Portland limestone cement using X-ray fluorescence spectrometer. By using the elemental analysis of major oxides is it possible to calculate this percentage ?

I want to know if it is possible to make any definitive conclusion about Carbon present in Aluminium alloy from the EDS report as it might be highly inaccurate.

Typically, several factors are considered, when deciding between Finite Element [FE] Analysis and Boundary Element [BE] Analysis, for a specific problem, and include whether the problem to be solved is a "Shell-type" Structure, "Linear" or "Nonlinear" application. It also depends on the degree of accuracy that you want to achieve, and the amount of time that will be necessary to prepare and analyze (interpret) the output data that will be obtained.

Keeping this in mind, what do you prefer to use for your Analysis work and Research ?

We have some O-rings made of perfluoroelastomer (FFKM) from a different vendors and we would like to determine the cross-linking density to correlate with performance. Can anyone suggest a suitable technique?

I was run 100ns MD simulation for native and mutant structures. Although, RMSD, RMSF plotting was done but I want to compare native and mutant structures through secondary structure element analysis. How can I start for building SSE plot from YASARA trajectory files?

Thanks in advance.

while performing edx on powder MgB2 sample in TEM, i observe Cu and C intense peaks. I was thinking this might be because of the TEM grid i am using. But can anyone help me how to avoid these signals.

Please I need information on laboratory that can undertake xrd (quantitative and qualitative) and elemental analysis using ICP-MS

For the work on a project, I need to convert results from proximate analysis of wood biomass to elemental. After looking in the literature, I have found only Gebhardt formula applicable to coal. Is there any published method/formula to convert proximate analysis to elemental for biomass?

I am searching possibilities of analyzing coordination sphere geometry of particular d-block metals contained in microcrystals (areas of up to, say, 20x20 microns) of a mineral embedded in a typical geological (electron-microprobe-dedicated) thin section. I was wondering if such an analysis is possible and if there is any laboratory that provides such analytical capabilities. The extraction of the mineral domains from the thin section using FIB is rather impossible in this case. I would be grateful for any suggestions of a laboratory where the above might be achieved. I am interested in the NMR analysis of H, Mg, Al, Si, V, Fe, Co, Ni, Ge and possibly Ag.

Dear Scholars,

I need to know is there any possible lab, institute or organisation in world providing economical ICP-MS/OES based elemental analysis of soil and plant samples.

I need to get my samples analysed for Ce (III,IV) , if there is any such lab which can offer Ce analysis at economical rates (~2-3$) then i can ship my samples (100+) to sourced laboratory.

Need your kind response in this regard.

Thanks!

Alright, I am trying to find LHV for a liquid fuel. Let's say the fuel is a type of gasoline. The first thing that came up to my mind was to perform elemental analysis, then calculate HHV using Dulong and Petit equation, then convert to LHV using this equation:

LHV = HHV – 2400 ( M+9H2) kJ/Kg

I know EDS is not an option, I also doubt whether GC-MS might be helpful.

I don't really know any other liquid fuel elemental analysis instruments. If someone's willing to share an insight, I'd be very grateful.

Thanks in advance

A strange fact has been noticed in an ICP-MS instrument equipped with triple quadrupole: After the performance check (interface check), the uranium (238 isotope) counts have been consistently lower than the counts for the In (115 isotope).

Theoretically, it is expected that the larger the element mass, the higher counts recorded by the detector. And this theory proves true in practice for all the other elements present in the TUNE solution. Only uranium contravenes the trend and presents lower counts (U <In).

Could any ICP-MS expert suggest a procedure to improve this performance? Anyone else with similar problem?

Relevant informations:

1 * Commercial tune solution: 1 ppb for each element

2 * Fact repeats with aqueous standards for different concentrations

3 * Formation of oxide <2% (measured by the ratio 140Ce.160O / 140Ce)

4 * Uranium oxide formation <3% (measured by 238U.160 / 238U)

5 * The U-signal measured in the TUNE solution is often below 330,000 cps (value set by the performance) and usually its stability is above 2%. After cleaning the sampling cone, the skimmer and the lens, an improvement in the Uranium signal can be immediately noticed. However, this signal remains less than that of the Indium (In) and after a short time of use (typically 1-2 hours) the U signal drops again and the stability worsens.

6 * Skimmer, torch and new cones have been tested and the situation persists.

7 * Situation continues, even after new tuning, mass and detector calibration.

I did CHNS analysis of my biochar samples ans i have to g=find out these ratio. In some papers i saw they directly calculate it by the %C, %H, %N obtained by CHNS. but in some papers they minus the %ash content from %C content. and for some papers they did it with some entirely different way which i am not able to figure out. Kindly help me to figure out the right way to calculate these ratios.

I have to done use SEM-EDX for the imaging and elemental analysis of a fabric coated with metal nanoparticles. Do i have to sputter coat the fabric with is coated with nps ? Can i take the SEM images without sputter coating? I want to know, will i get dark image of fabric with illuminated nps on it. If yes then its fine if no then i want to know is the fabric visible? And if the gold sputter coating will have any reaction with coated nanoparticles which could alter edx data/result .. Suggest please.

It is a known fact that the Si/Al ratio of the cementitious matrix influences the behavior of the geopolymer concrete.

However, I would like to know about the effect of the Si/Al ratio of the cementitious matrix on the behavior/characteristics of a normal Portland cement concrete or high performance concrete made with supplementary cementitious materials.

-Also, is there any method to calculate the 'Si/Al ratio of the C-S-H' from the 'Si/Al ratio of the hardened concrete'?

In so many publications, ICP-OES (inductively coupled plasma optical emission spectrometry) has been used for the calculation of nanoparticles concentration. Is it the right way? I feel that ICP-OES can do elemental analysis. Expecting your views.

I have some data in which a number of the analyte concentrations (data points) obtained were below the quantitation limit (LOQ) of the method used. This is possibly as a result of both the low values of the analytes of intrest expected in the test samples and the method and instrument detection limits. In such a case, how are these "missing" data points treated during statistical analysis and subsequent interpretation and representation?

We are testing for surface elemental contamination in Plasma Sprayed Yttrium Oxide. The problem we are having is that our extraction solution is not beading up on the surface very well. Is there anyone that has experience doing this that can tell me the best way to prep the surface? The Yttria is sprayed on a small Aluminum coupon, and we need the extraction solution to bead up as much as possible. Right now we are having a lot of instances where our solution spreads across most of the coupon, which makes recovering the solution for analysis difficult. We also want to have more control over the extraction area.

Assuming that the alloy is completely dissolved using acid digestion.

If possible, can someone please suggest the type of ICP to use?

We want to do the elemental analysis on sand samples with ICP-OES can anyone recommend a certified reference material which we could purchase?

I am looking for sample preparation technique for trace elemental analysis of spinel. I need to perform analysis using solution-ICP-MS. My colleagues advise me to put spinel sample and hydrochloric acid (or aqua-regia) into glass vessel, solder up the vessel and keep it in the furnace for 7~30 days at 250°C. The same method I see in old handbooks. In modern publications usually mentioned LA-ICP-MS, but I have no such device. Can I dissolve spinel in some acid (or mixture) using Microwave Digestion Workstation with PTFE or TFM vessel? Have somebody had such experience?

I am trying to analyze Lead in water samples using an atomic absorption analyzer. I tried without modifier but i get really low absorbance levels. I guess I need appropriate matrix modifier to increase the signal.

Hello, I am currently researching a spectral computed tomography system for medical applications. The system excels in delineating the elemental composition of materials, providing a 3D representation of the each element's distribution. This has shown excellent results in determining the composition of calcifications but I'm wondering what other diseases researchers are aware of that might benefit from this technique.

Cedar is the common name for cedar wood, used for several different trees that grow in different parts of the world.

The characterization along with chemical analysis of the adsorbent is essential for my study to know about the percentage of different chemical constituents in the adsorbent.

Please, suggest me the specific tests for characterization as well as for elemental analysis of the adsorbent.

Which technique is most suitable for elemental analysis in the environmental analysis?

Instrumental neutron activation analysis INAA

Inductively coupled plasma mass spectrometer ICP-MS

X-ray fluorescence XPR