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钨矿中锡的测定前人已做了大量的工作,但不管哪种方法,钨都有不同程度的干扰,必须进行预分离。钨矿及其他矿物以及它们的选冶产品中锡的含量往往相差很大,对于同一批试样,一般需用两种方法分析,这给分析工作带来很大不便。资料提出在碱性介质中,有酒石酸和EDTA存在下,用硫化钠沉淀分离铅、铜等干扰元素,并使锡在碱性介质中定量地进入溶液。在四苯砷氯盐酸盐(TPAC)体系中,最低可测至每毫升0.01微克锡,
Tungsten in the determination of tin has done a lot of work before, but no matter which method, tungsten have different levels of interference, must be pre-separation. The content of tin in tungsten ore and other minerals and their smelting products often varies greatly. For the same batch of samples, two methods are generally required for the analysis, which brings great inconvenience to the analysis. The data suggest that in alkaline media, with tartaric acid and EDTA, the interference elements such as lead and copper are separated by sodium sulphate precipitation and the tin is allowed to enter the solution quantitatively in an alkaline medium. In tetraphenyl arsenic chloride hydrochloride (TPAC) system, the minimum measurable 0.01 micrograms tin per milliliter,