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常用的硫氰酸盐光度法测定钢中钼灵敏度较低。对微量钼且须富集或萃取。近年来,对阳离子表面活性剂存在下,邻苯二酚紫光度法测定钼已有报导。本文采用在溴化十六烷基吡啶(CPB)存在下,邻苯二酚紫(PV)分光光度法直接在水溶液中测定钼。并用抗坏血酸(AK)、KF-EDTA掩蔽共存元素的干扰。对六种含钼量为0.005-0.56％的普碳钢及低合金钢标样测定均获得满意结果。本方法钼浓度在25—150微克/50毫升范围内符合比尔定律,比现行的硫氰酸盐光度法更为快速、灵敏、简便,适于测定普碳钢及低合金钢中钼的含量。 1.主要试剂:(1)10％AK(现用现配);
Common thiocyanate spectrophotometric determination of molybdenum in steel with lower sensitivity. For trace amounts of molybdenum, it must be enriched or extracted. In recent years, the presence of cationic surfactants, catechol violet spectrophotometry has been reported molybdenum. In this paper, molybdenum was directly measured in aqueous solution by catechol violet (PV) spectrophotometry in the presence of cetyl pyridinium bromide (CPB). Ascorbic acid (AK) and KF-EDTA were used to mask the interference of coexisting elements. Satisfactory results were obtained on the determination of six standard carbon steel and low alloy steel containing 0.005-0.56% molybdenum. The method of molybdenum concentration in the range of 25-150 micrograms / 50 milliliters of Beer’s Law, than the current thiocyanate photometric method is more rapid, sensitive and simple, suitable for the determination of carbon content of carbon steel and low alloy steel. 1. The main reagents: (1) 10% AK (now with the current allocation);