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Magnuss Vircavs Vallija Rone Daina Vircava 《Analytical and bioanalytical chemistry》1994,350(10-11):650-651
Oxidation products of 5-bromo and 2-methylthio-quinoline-8-thiol are used for the quantitative coprecipitation of As(III), Cu(II) and Cd(II) from water solutions in a wide range of acidity. The recovery is >95%. 相似文献
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Magnuss Vircavs 《Fresenius' Journal of Analytical Chemistry》1995,351(2-3):340-341
The coprecipitation of Fe(III) quinoline-8-thiolate (QT) with bis (8-quinolyl) disulphide has been investigated with 1 mol × dm–3 potassium tartrate and 0.001 mol × dm–3 aqueous tartaric acid solutions in dependence on their pH. In return QTs of Cu(II), Cd(II) and Hg(II) have been coprecipitated from 0.2, 0.1, 0.01 and 0.001 mol × dm–3 aqueous solutions of tartaric acid after adjusting the pH to 6–7. These tartaric acid concentrations relate to their initial concentrations before the coprecipitation. The presence of tartrate ions influences the recovery of the coprecipitated Fe(III), Cd(II) and Hg(II) QTs. A complete coprecipitation of the Cu(II) inner complex compound can be achieved from the aqueous solutions indicated. 相似文献
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A method has been developed for the group concentration of microamounts of metals (Fe, Co, Ni, Mn, Cu, Zn, Cd, Hg, Pb, Bi, Sb, Mo, W, V, Cr, Ga, In, Sn, Ag, Au, Pd, Pt) in the form of their 8-mercaptoquinolinates co-precipitated on bis(8-quinolyl) disulphide as collector, the latter being an oxidation product of 8-mercaptoquinoline. The collector is formed during the co-precipitation process, which is the reason for its high co-precipitating power. The elements thus concentrated are determined by atomic-absorption spectrometry after dissolution of the precipitate in dilute nitric acid. 相似文献
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