Abstract
AbstractA simple and rapid method for the determining arsenate and phosphate in rainwater is proposed. These compounds form molybdoarsenate– and molybdophosphate–Malachite Green aggregates with MoMG reagent (MoMG = a mixture of ammouium molybdate and Malachite Green). The aggregates were first collected on a nitrocellulose membrane filter (pore size 3μm) and then dissolved with the filter in a small amount of 2‐methoxyethanol. Absorbance (627 nm), denoted as A(As + P), was found to be proportional to the sum of the arsenate and phosphate concentrations with a molar absorptivity of 2.8 × 105 (mol dm−3)−1 cm−1. Following the addition of thiosulphate, an agent which reduces arsenate, the absorbance A(P) was measured as described above. A(P) corresponded to the concentration of phosphate alone and A(As + P)–A(P), to arsenate concentration only. This method is shown to be a rapid and highly accurate means for determining arsenate and phosphate levels within the 1–150 nmol dm−3 concentration range.
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