The speciation of arsenic(V) and arsenic(III), by ion-exclusion chromatography, in solutions containing iron and sulphuric acid |
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Authors: | Hemmings M J Jones E A |
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Affiliation: | Analytical Science Division, Mintek, Private Bag X3015, Randburg 2125, Republic of South Africa. |
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Abstract: | Arsenic(V) and arsenic(III) can be separated, by ion-exclusion chromatography, in solutions containing iron and sulphuric acid. Iron is removed by ion-exchange before the speciation of arsenic, with phosphoric acid as the eluent. The separated arsenic(V) and arsenic(III) are measured spectrophotometrically in the ultraviolet region at a wavelength of 195 mn. Arsenic(V) and arsenic(III) can be determined at concentrations > or = 3 mg/1. The relative standard deviations are 1.3% for arsenic(V) and 0.9% for arsenic(III), at the 10 mg/1. level. The time required for the separation of the inorganic arsenic species is 11 min. |
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