[Not Available].
A method is described for the microanalytical determination of arsenic, antimony and copper in organic compounds. These compounds are decomposed in a mixture of sulphuric and nitric acids. The decomposition products are then oxidized by hydrogen peroxide in the case of arsenic and by potassium permanganate in the case of antimony in order to obtain AsO(4)(3-) or SbO(4)(3-) ions respectively. In the case of copper, Cu(2+) ions are obtained directly as a decomposition product. Iodine generated by constant-current electrolysis of potassium iodide contained in the solution is the titrating reagent, with sodium thiosulphate solution as intermediate reagent, and amperometric end-point detection. The iodine consumption is measured coulometrically.
Bigois
M
M
Service Central de Microanalyse du Centre National de la Recherche Scientifique, 2, rue Henry Dunant, 94-Thiais, France.