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关於硫中硒的测定,文献上虽已有不少方法提出,但在含硒量低时,一般需用数十克以至百克的硫進行分析,並且这些方法也不能用來測定含量低於十万分之一的样品。使硒还原为元素狀态的比色法虽可用於微量硒的测定,但当硫中含硒極微时,仍需用数十克样品進行分析,这不僅要耗費很多試剂,操作上也有困难。Lindhe提出的用可待因与SeO_2在濃硫酸中的顏色反应來测定硫中含硒量的比色法,由於
Although many methods have been proposed in the literature for the determination of selenium in sulfur, it is generally required to use tens of grams or even one hundred grams of sulfur for analysis when the amount of selenium is low, and these methods can not be used to determine the content of selenium One hundred thousandth sample. The colorimetric method of reducing selenium to an elemental state may be used for the determination of trace amounts of selenium but it still requires tens of grams of sample for analysis when it contains very little selenium in the sulfur, which requires not only a lot of reagents but also operational difficulties . Lindhe proposed colorimetric determination of the amount of selenium in sulfur by the color reaction of codeine and SeO 2 in concentrated sulfuric acid. As a result of