Simultaneous separation and preconcentration of Cr(III), Cu(II), Cd(II) and Pb(II) from environmental samples prior to inductively coupled plasma optical emission spectrometric determination
We have developed a new method of the separation, preconcentration, and determination of Cr(III), Cu(II), Cd(II) and Pb(II) ion in water samples. It is based on the use of activated carbon that was modified with rhodamine 6G to yield a solid-phase sorbent. The experimental conditions for adsorption were optimized. Cr(III), Cu(II), Cd(II) and Pb(II) can be quantitatively adsorbed at pH 4, and adsorbed Cr(III), Cu(II), Cd(II) and Pb(II) can be completely eluted with 1M hydrochloric acid. The maximum adsorption capacity is 37.8, 47.8, 56.5 and 41.7 mg g(-1) for Cr(III), Cu(II), Cd(II) and Pb(II). Cr(III), Cu(II), Cd(II) and Pb(II) ions were then determined by inductively coupled plasma optical emission spectrometry. The detection limit (3σ) is under 0.35 ng mL(-1), and the relative standard deviation is lower than 3.5% (n=11). Common potentially interfering ions do not interfere with the adsorption and determination of the analytes. The method displays selectivity, sensitivity and reproducibility, and was successfully applied to the determination of biological and water samples.
Available from: Chris Harrington
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ABSTRACT: This is the fifth Atomic Spectrometry Update (ASU) to focus specifically on developments in elemental speciation and covers a period of approximately 12 months from January 2012. The International Union for Pure and Applied Chemistry (IUPAC) have evaluated speciation and provided a definition as follows: "speciation analysis is the analytical activity of identifying and/or measuring the quantities of one or more individual chemical species in a sample; the chemical species are specific forms of an element defined as to isotopic composition, electronic or oxidation state, and/or complex or molecular structure; the speciation of an element is the distribution of an element amongst defined chemical species in a system". This review therefore deals with all aspects of the analytical speciation methods developed for: the determination of oxidation states; organometallic compounds; coordination compounds; metal and heteroatom-containing biomolecules, including metalloproteins, proteins, peptides and amino acids; and the use of metal-tagging to facilitate detection via atomic spectrometry. As with all ASU reviews(1-5) the coverage of the topic is confined to those methods that incorporate atomic spectrometry as the measurement technique. However, in the spirit of meeting the needs of the subject, material is incorporated that is not strictly "atomic spectrometry". For the most part, such procedures are those in which some form of molecular MS is used for speciation measurements, often in parallel with an elemental detector. As the content of this Update shows, the field is now maturing as evidenced by the extent to which the speciation of particular elements or technique combinations have been the subject of review articles. However, it is becoming increasingly difficult to ascertain the analytical details of the methodologies applied in speciation analysis, particularly where the paper is published in an 'application' based journal.
Journal of Analytical Atomic Spectrometry 08/2011; 26(8):1561-1595. DOI:10.1039/C1JA90030G · 3.47 Impact Factor
Available from: Aleksandar Lolic
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ABSTRACT: A gas-diffusion flow injection method with amperometric detection for the indirect detn. of copper on a silver electrode was developed. The flow through system was equipped with two injection valves and a gas-diffusion unit. In the first step, a signal of a cyanide soln. was recorded. In the subsequent step, the signal of cyanide in the presence of copper was measured. Interferences (Cd(II), Co(II), Ag(I), Ni(II), Fe(III), Hg(II) and Zn(II)) were investigated and successfully removed. The calibration graph was linear in the range 1-90 μmol dm-3 of copper with a correlation coeff. of 0.993. The regression equation is I = (0.0455 ± 0.0015)c + (0.4611 ± 0.0671), where I is the relative signal decrease in μA and c is concn. in μmol dm-3. Relative std. deviation for six consecutive injections of 30 μmol dm-3 copper(II) was 1.47 % and for 1 μmol dm-3 copper(II), it was 3.40 %. The detection limit, calcd. as 3 s/m (where s is a std. deviation of nine measurement of a reagent blank and m is the
Journal of the Serbian Chemical Society 01/2012; 77(11-11):1641-1647. DOI:10.2298/JSC120616090L · 0.87 Impact Factor
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ABSTRACT: A new, simple and rapid method based on dispersive liquid-liquid microextraction (DLLME) was developed for extracting and preconcentrating copper (Cu), nickel (Ni), lead (Pb) and cadmium (Cd) in water samples prior to flame atomic absorption spectrometry (FAAS) analysis. 1-(2-thiazolylazo)-naphthol (TAN) was used as chelating reagents, and non-ionic surfactant Triton X-114 and CCl(4) as disperser solvent and extraction solvent, respectively. Some influential factors relevant to DLLME, such as the concentration of TAN, type and volume of disperser and extraction solvent, pH and ultrasound time, were optimized. Under the optimal conditions, the calibration curve was linear in the range of 10-800 μg L(-1) for Cu and Ni, 10-500 μg L(-1) for Pb, and 10-1,000 μg L(-1) for Cd, respectively. The limits of detection for the four metal ions were below 0.5 μg L(-1), with the enhancement factors of 105, 66, 28 and 106 for Cu, Ni, Pb and Cd, respectively. The relative standard deviations (RSD, n = 6) were 2.6-4.1%. The proposed method was applied to determination of Cu, Ni, Pb and Cd in water samples and satisfactory relative recoveries (93.0-101.2%) were achieved.
Water Science & Technology 11/2012; 67(2):247-53. DOI:10.2166/wst.2012.524 · 1.11 Impact Factor
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