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当镍精炼车间处理夹带钨的废镍时,少量钨就会进入镍净化系统,故需在大量镍存在下进行微量钨的测定。本文参考了钼中钨的测定方法,在8～9N盐酸溶液中,W~(6+)被二氯化锡还原成W~(5+)与二安替比林甲烷和硫氰酸盐形成黄色的三元络合物,然后用氯仿萃取比色进行钨的测定。一检量线的绘制分别加入0、2.5、5、……32.5微克钨(称取0.1260克纯三氧化钨,溶于20毫升2%的氢氧化钠溶液中,以水稀至1升。此溶液1毫升含钨100微克,再分液稀释10倍使用)于100毫升高型烧杯中,滴入10滴浓硫酸,加热至冒白烟,冷却,加盐酸(8N)15毫
When the nickel refineries process scrap nickel that is entrained with tungsten, a small amount of tungsten enters the nickel purification system, so the determination of trace tungsten in the presence of a large amount of nickel is required. This paper refers to the determination of tungsten in molybdenum, W ~ (6+) is reduced to W ~ (5+) with di-antipyrine methane and thiocyanate in 8 ~ 9N hydrochloric acid solution Yellow ternary complex, followed by colorimetric extraction with chloroform for the determination of tungsten. A calibration curve were drawn 0,2.5,5, ... 32.5 micrograms of tungsten (weighed 0.1260 grams of pure tungsten oxide, dissolved in 20 ml of 2% sodium hydroxide solution, diluted with water to 1 liter. This Solution 1 ml of tungsten 100 μg, and then dilute 10 times the use of sub-use) In 100 ml high-type beaker, drip 10 drops of concentrated sulfuric acid, heated to white smoke, cooled, add hydrochloric acid (8N) 15 milliseconds