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矿石中硫的测定以重量法较为准确,燃烧法较为快速,但均需较特殊设备。在例行容量测定中,由于干扰元素较多,难于得到满意的结果。为了适应地质野外化验工作的需要,我们采用逆王水(或碱熔)分解样品,把矿石中的硫氧化成SO_4~(2-),在2％的硝酸介质中,用EDTA络合Pb~(2+)、Sr~(2+)、Ca~(2+)等干扰元素,然后加入Ba~(2+),使生成BaSO_4沉淀,经过滤分离大多数干扰元素后,用EDTA法测定Ba~(2+),换算出硫的含量。此法适于测定2％以上的硫。我们曾对十个矿种的样品进行过测定,得到了满意的结果。
Determination of sulfur in ore ore gravimetric method is more accurate, combustion method is faster, but all need more special equipment. In routine capacity measurement, it is difficult to obtain satisfactory results due to the large number of interfering elements. In order to meet the needs of geological field laboratory work, we use inverse Wang water (or alkali melting) decomposition of the sample, the sulfur in the ore oxidation SO_4 ~ (2-), 2% nitric acid medium, complexation with Pb ~ (2 +), Sr ~ (2 +), Ca ~ (2+) and other interference elements, and then add Ba ~ (2+) to produce BaSO_4 precipitate, the majority of interference elements were separated by filtration, ~ (2+), converted sulfur content. This method is suitable for the determination of more than 2% sulfur. We have carried out the determination of the samples of ten minerals, and got satisfactory results.