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钨铁样品经酸溶解后,采用氢氧化钠碱分离除去大部分干扰元素。所得钨酸钠试液,加醋酸铅使钨酸铅沉淀析出,无需过滤,在pH5.5—5.8时用EDTA滴定过量的铅,与钨酸一起进入碱液中的元素有铝和少量铁、锰、铜、锡等,分别用乙酰丙酮,邻啡啰啉及乳酸掩蔽。由于省却了过滤、洗涤、沉淀的操作,本方法比较简便、快速。
Tungsten iron samples after acid dissolution, the use of sodium hydroxide alkali to remove most of the interference element separation. The resulting sodium tungstate test solution, plus lead acetate lead precipitates lead tungstate, without filtering, titration with EDTA at pH 5.5-5.8 when excessive lead, together with the tungstic acid into the alkaline solution of aluminum and a small amount of iron, manganese , Copper, tin, etc., were masked with acetylacetone, o-phenanthroline and lactic acid, respectively. As a result of eliminating the filtering, washing, sedimentation operation, the method is relatively simple and fast.