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作者曾用砷锑钼蓝直接光度法测定金属锑中砷,方法是:样品经分解后制成待测液。吸取待测液二份,一份不加入Na_2S_2O_3,磷砷同时显色;另一份加入Na_2S_2O_3,使磷单独显色。从而计算砷的含量。金属锑含杂质较少,砷的含量一般高于磷的含量,可用上法测定。若将此法推广应用到锑矿石及其它成份较复杂的含锑样品,用Na_2S_2O_3掩蔽砷,共存的多种金属离子(例如Cu~(2+)、Bi~(3+)等)与Na_2S_2O_3生成沉淀物或酸度不当时Na_2S_2O_3也容易分解析出硫,二种情况均使溶液浑浊。故本文采用硼氢化钾法挥发除砷,消除磷显色时砷的干扰。方法快速、干扰少,对大多数含砷量高于含磷量的锑矿石,采用本法可快速测定砷含量,测定范围为0.01～2%。
The authors have used arsenic antimony molybdenum blue direct spectrophotometric determination of arsenic in metallic antimony, the method is: the sample after decomposition made of the test solution. Draw two test solution, one without adding Na_2S_2O_3, phosphorous arsenic at the same time color; the other by adding Na_2S_2O_3, phosphorus alone color. To calculate the arsenic content. Antimony metal impurities less, the content of arsenic is generally higher than the phosphorus content can be determined by the method. If this method is widely applied to the antimony ore and other complex samples containing antimony, Na 2 S 2 O 3 masks arsenic, coexisting metal ions (such as Cu 2+ and Bi 3+) and Na 2 S 2 O 3 When the precipitate or acidity is not right Na_2S_2O_3 is also easy to break down the precipitation of sulfur, both cases make the solution cloudy. Therefore, this paper adopts potassium borohydride method to volatilize arsenic to eliminate the interference of arsenic when phosphorus is colored. Rapid method, less interference, for most of the arsenic content higher than the phosphorus content of antimony ore, the rapid determination of arsenic content by this method, the determination of the range of 0.01 to 2%.