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含锑样品中砷的测定,一般需分离锑、砷,手续繁琐,时间长,本法采用浓硫酸溶样,过滤除去大部分锑(Ⅲ)水解沉淀物,得到透明的待测溶液,最后用砷锑钼蓝直接光度法测定砷:即吸取二份待测液,一份不加入硫代硫酸钠的显色液,磷、砷同时显色;另一份加入硫代硫酸钠,将砷(Ⅴ)选择性还原为砷(Ⅲ)后,再加混合显色剂,则仅磷显色,可消除磷的干扰。待测液中所含少量锑和其他常见元素不干扰测定。本法
Determination of arsenic in samples containing antimony, the general separation of antimony, arsenic, tedious procedures for a long time, the law using concentrated sulfuric acid sample, filtered to remove most of the antimony (III) hydrolysates to obtain a transparent test solution, and finally with Arsenic antimony molybdenum blue direct spectrophotometric determination of arsenic: that is, to absorb two to be measured solution, one without sodium thiosulfate color reagent, phosphorus, arsenic at the same time color; the other by adding sodium thiosulfate, arsenic ( Ⅴ) selective reduction of arsenic (Ⅲ), coupled with mixed color reagent, only phosphorus color, phosphorus can eliminate the interference. The test solution contains a small amount of antimony and other common elements do not interfere with the determination. This Law