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在有乙醇的酸性介质中,苯基萤光酮与溴化十六烷基三甲铵能与钨离子生成稳定的胶束三元络合物,是测钨比较灵敏的显色反应,摩尔吸光系数可达1.1×10~5,桑德尔灵敏度S=0.00165微克/厘米~2。在试验条件下钼与钨的化学性质极为相似,钼离子形成的络合物,严重干扰钨的测定,可以利用盐酸羟胺与EDTA还原掩蔽予以消除,基体铁元素被抗坏血酸还原后,可以不需分离,在试样酸溶后直接进行钨的测定。适合于钢铁中钨的快
In acidic media with ethanol, phenylfluorone and cetyltrimethylammonium bromide can form stable micellar ternary complexes with tungsten ions, which is a relatively sensitive color reaction for the determination of tungsten. The molar extinction coefficient Up to 1.1 × 10 ~ 5, SANDAL sensitivity S = 0.00165 μg / cm ~ 2. Under the experimental conditions, the chemical properties of molybdenum and tungsten are very similar. The complex formed by molybdenum ions seriously interferes with the determination of tungsten and can be eliminated by using hydroxylamine hydrochloride and EDTA to reduce the masking. After the matrix iron is reduced by ascorbic acid, it can be separated without isolation , In the sample acid solution directly after the determination of tungsten. Suitable for fast tungsten in steel