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硫酸-苦杏仁酸-辛可宁-氯酸钾体系中钨的催化极谱测定,已有许多报导,但钼的允许量都较低。本文着重研究了在该体系中大量钼存在下微量钨的测定。本法可不经分离直接测定钼基样品中含量为0.005%以上的钨。实验部分一仪器与试剂 JP-1A型示波极谱仪。钨标准溶液:称取光谱纯三氧化钨0.3152克,加入10毫升25%氢氧化钠(特纯),溶解后转入250毫升量瓶中,用二次蒸馏水稀释至刻度,摇匀。此溶液为1mgW ml~(-1)。以此溶液配制1μg ml~(-1)和0.1μg ml~(-1)
Catalytic polarographic determination of tungsten in the sulfuric acid-mandelic acid-cinchonine-potassium chlorate system has been reported, but the allowable amount of molybdenum is low. This article focuses on the determination of trace amounts of tungsten in the presence of a large amount of molybdenum in this system. This method can be directly measured without separation of molybdenum-based samples containing more than 0.005% of tungsten. Experimental part of an instrument and reagent JP-1A oscilloscope. Tungsten standard solution: Weigh spectral pure tungsten trioxide 0.3152 grams, add 10 ml of 25% sodium hydroxide (special purity), dissolved into 250 ml volumetric flask, diluted with distilled water to the mark, shake. This solution is 1mgW ml ~ (-1). Prepare 1μg ml ~ (-1) and 0.1μg ml ~ (-1)