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由文献可知钨与BPR-CTMAB形成的有色络合物严重干扰钼的测定,所以本文研究了W(Ⅵ)-BPR-CTMAB三元络合物的光度测定条件。鉴于钼(V)和硫氰酸盐形成的络合物不被活性氧化铝所吸附的性质,使钨和钼分离,消除了钼的干扰。本法用于测定纯铁及钢中微量钨,获得了良好的结果。 (一)主要试剂与仪器 1.钨标准溶液(1):称光谱纯三氧化钨1.2611克于100毫升5N氢氧化钠溶液中,加热溶解,冷却后移入一升容量瓶
It is known from the literature that the colored complex formed by tungsten and BPR-CTMAB seriously interferes with the determination of molybdenum. Therefore, the photometric conditions of W (VI) -BPR-CTMAB ternary complex were studied in this paper. In view of the nature of the complex formed by molybdenum (V) and thiocyanate being not adsorbed by activated alumina, tungsten and molybdenum are separated, eliminating the interference of molybdenum. This method is used to determine the trace amounts of tungsten in pure iron and steel and gives good results. (A) of the main reagents and instruments 1. Tungsten standard solution (1): Weigh the spectrum of pure tungsten trioxide 1.2611 g in 100 ml of 5N sodium hydroxide solution, heated to dissolve, cooled into a liter flask