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程广禄曾报告钼(Ⅳ)在0.1—0.2N高氯酸溶液中与二甲苯酚橙作用呈微红色,反应灵敏度不高。低价钼与二甲苯酚橙的反应似未见报告,作者试验若干种还原剂,提出用盐酸羟胺还原钼,随后用二甲苯酚橙检出钼的方法。本法具颇高的灵敏度和选择性,可在钨和铼存在下检出钼。兹将实验结果报告如下。实验部份一、试剂二甲苯酚橙——新中化学厂,钠盐,于乙酸钠溶液中用乙醇重沉淀数次。钼酸铵——美国Merck,微量分析用试剂,配成溶液,用钼酸铅法测定其浓度为
Cheng Guanglu had reported molybdenum (Ⅳ) in 0.1-0.2N perchloric acid solution with xylenol orange role was reddish, the reaction sensitivity is not high. Low molybdenum and xylenol orange reaction like no report, the author tested a number of reducing agents, the proposed reduction of molybdenum hydroxylamine hydrochloride, followed by xylenol orange detection of molybdenum. This method has a high sensitivity and selectivity, molybdenum can be detected in the presence of tungsten and rhenium. The experimental results are reported below. Experimental part A reagent xylenol orange - New Chemical Plant, sodium salt, sodium acetate solution in precipitation with ethanol several times. Ammonium molybdate - United States Merck, trace analysis reagents, dubbed the solution, the concentration of lead molybdate was determined as