منابع مشابه
Chromium redox speciation in food samples
Chromium is an element with important biological characteristics, depending on its different species. Cr(III) is considered as essential; however, the Cr(VI) form is classified as carcinogenic. For this reason, speciation analysis in food samples is a very important question. The proposed data procedures for chromium redox speciation in the literature can be divided into those with the use of o...
متن کاملSpeciation of arsenic, chromium, and vanadium in red mud samples from the Ajka spill site, Hungary.
Results are presented from X-ray absorption spectroscopy based analysis of As, Cr, and V speciation within samples of bauxite ore processing residue (red mud) collected from the spill site at Ajka, Western Hungary. Cr K-edge XANES analysis found that Cr is present as Cr(3+) substituted into hematite, consistent with TEM analysis. V K-edge XANES spectra have E(1/2) position and pre-edge features...
متن کاملSpeciation of chromium in water samples by solid-phase extraction on a new synthesized adsorbent.
Poly(1,3-thiazol-2-yl methacrylamide-co-4-vinyl pyridine-co-divinylbenzene) was prepared and used as a sorbent for the solid-phase extraction of Cr(VI) ions from aqueous solution. Two forms of chromium showed different exchange capacities at different pH values; Cr(VI) was selectively retained especially at pH 2. The total chromium was determined after the oxidization of Cr(III) to Cr(VI) by po...
متن کاملPreconcentration and speciation of chromium in water samples by atomic absorption spectrometry after cloud-point extraction.
A rapid, sensitive and accurate atomic absorption method for Cr(III) and Cr(VI) ions was developed based on the cloud-point extraction (CPE) technique. Cr(III) reacts with a new Schiff's base ligand to form the hydrophobic complex, which is subsequently entrapped in the surfactant micelles. The Cr(VI) assay is based on its reduction to Cr(III) by the addition of concentrated H2SO4 and ethanol t...
متن کاملSpeciation Analysis of Chromium in Waters
The total content of chromium in natural waters does not generally exceed several μg/l. Thus, it is obvious that various forms of chromium will occur at the levels of tenths or hundredths of μg/l. Their determination requires the application of a sufficiently sensitive method, but its specificity has an important role to play in the case of chemical individuals or selectivity in regard to speci...
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ژورنال
عنوان ژورنال: TURKISH JOURNAL OF CHEMISTRY
سال: 2016
ISSN: 1300-0527,1303-6130
DOI: 10.3906/kim-1606-5