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一、前言高含量钼的分析,目前国内外多采用钼酸铅重量法,8-羟基喹啉重量法,2-安息香肟重量法,这些方法,不仅流程长,而且干扰也较多,对于含有钨、磷、砷、铬、钒的样品,处理起来较为麻烦。近年来出现了以EDTA为络合剂的间接滴定、直接滴定的络量法以及以硫酸肼为选择性还原剂的快速氧化还原法,钒仍干扰测定。本文提出一种基于硫氰酸盐比色的“全差示光度法”,较之上述方法均快速、简便,选择性高,准确度好。
First, the preface Analysis of high molybdenum content, at home and abroad to use more lead molybdenum weight method, 8-hydroxyquinoline gravimetric method, 2-benzoin oxime weight method, these methods, not only long process, but also more interference, for containing Tungsten, phosphorus, arsenic, chromium, vanadium samples, to deal with more trouble. In recent years, indirect titration with EDTA as the complexing agent, direct titration of the volumetric method, and rapid redox method using the hydrazine sulfate as a selective reductant have been reported. Vanadium still interferes with the determination. This paper presents a thiocyanate colorimetric “full differential spectrophotometry,” compared with the above methods are fast, simple, high selectivity and accuracy.