Differential pulse polarographic determination of traces of arsenic in semiconductor silicon

Analysis and Speciation of Traces of Arsenic in Environmental, Food and Industrial Samples by Voltammetry: a Review

“…Dissolution with HF/HNO 3 and KMnO 4 for As( III ) 3 As( V ) to avoid loosing As( III ); As( V ) 3 As(III ) with Na 2 SO 3 for total As determination as As( III ) [51,138] Semiconductor silicon Voltammetric technique: DPASV; W.E. : Au disk; Electrolyte: HCl; LOD: not given (subppm levels)…”

“…Dissolution with HCl/H 2 SO 4 ; distillation of AsCl 3 under vacuum; As( V ) 3 As( III ) with N 2 H 4 ¥ H 2 SO 4 for total As determination as As( III ) [86] ed as SO 2À 3 [12,14,50,73,102,133,138], HSO À 3 [49] or SO 2(g) [34,36,52,66]), S 2 O 2À 3 [70], hydrazine (added as sulfate or hydrochloride) on its own or in the presence of HBr [24,34,35,67,74,86,87,98], KI (sometimes in the presence of ascorbic acid) [65, 103, 110 ± 112, 114, 122, 123, 131] and hydroxylamine [135]. Dubey and Puri [64] claim that As(V) is reduced to As(III) during the solid-phase extraction of its morpholine-4-carbothioate complex onto naphthalene.…”

“…Methods for oxidizing the trivalent form, when the As(V) determination is preferred, have included chemical oxidation by KMnO 4 [7,55,138] and chlorine water [36] or photochemical conversion with UV radiation [21,23]. The latter can be useful also for the decomposition of dissolved organic matter in natural water samples [21,23,34,36] or arseno-organic compounds extracted from soil samples [138].…”

“…The latter can be useful also for the decomposition of dissolved organic matter in natural water samples [21,23,34,36] or arseno-organic compounds extracted from soil samples [138]. In this case, however, due to the simultaneous oxidation of As(III) by UV radiation, speciation is no longer possible [23].…”

“…For the determination of arsenic in cadmium, distillation of AsCl 3 is carried out [86]. The determination in fluorspar (CaF 2 ) [136] does not require any purification step; neither does the analysis of gold [69], electronic grade reagents [51,53], mineral acids in general [34], glass [137] and electronic grade materials [28,50,138,146].…”