Abstract
Chromotrope 2R forms a pink complex ( λ max=570 nm) with magnesium in aqueous acetone medium at pH 10.8; down to 0.01 p.p.m. of magnesium can be determined spectrophotomctrically. The metliod is sensitive (ϵ =37,000) and relatively selective. The colour is formed immediately, and is stable for 90 min. Zinc (200 mg), aluminum (10 mg), iron(III) (20 mg), manganese (1.5 mg), copper (1 mg), lead (0.7 mg), cadmium (1 mg), tin (0.5 mg) and nickel (0.02 mg) do not interfere in the presence of triethanolamine and many other metals can be tolerated; large amounts of beryllium interfere. The method is applicable to the direct determination of magnesium (0.01–4%) in zinc and aluminum alloy die castings.
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