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微量砷的测定一般多以砷钼蓝光度法和二乙硫代甲酸银法。后来以锑盐在室温使砷显色,生成的三元配合物比二元杂多酸灵敏度高。近年来使用三苯甲烷碱性染料后,其灵敏度大大提高。 作者研究了在0.6～0.7N硫酸介质中以抗坏血酸—硫酸羟胺为还原剂,用锑盐在室温使砷显色,使砷锑钼三元配合物在阳离子表面活性剂存在下与孔雀绿形成多元离子缔合物,该离子缔合物经正丁醇—乙酸丁酯混合有机溶剂萃取后,可以直接在有机相中进行比色测定。该方法简单、灵敏度高、可用于铅粉中0.00×％微量砷的分光光度测定。
Determination of trace arsenic is generally more with arsenic molybdenum blue photometry and silver thiosulfate method. Later antimony salt at room temperature to arsenic color, the resulting ternary complex than the binary heteropoly acid sensitivity. In recent years, the use of triphenylmethane basic dyes, the sensitivity greatly increased. The authors studied the use of ascorbic acid-hydroxylamine sulfate as a reducing agent in a 0.6-0.7 N sulfuric acid medium to color arsenic with an antimony salt at room temperature to form a multi-elemental mixture of arsenic antimony-molybdenum ternary complex with malachite green in the presence of a cationic surfactant Ion complex, the ion-association by n-butanol - butyl acetate mixed organic solvent extraction, the colorimetric determination of the organic phase can be carried out directly. The method is simple and has high sensitivity and can be used for the spectrophotometric determination of 0.00 ×% trace arsenic in lead powder.