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一、前言高含量铋的分析,目前普遍采用EDTA容量法。本试验以硫脲比色法为基础,用全差示法测定高含量铋。硫脲比色法与其他比色法相比较,干扰较多,但用于高含量铋的分析,这不是主要矛盾,由于它的克分子消光系数较低,ε_(479)=9×10~3,正适于高含量的测定。原硫脲比色法较突出的问题是发色后溶液不够稳定,夏天(室温30℃—40℃)放置30分钟以上就可能析出单体硫磺而发生浑浊,我们通过调整显色条件而使显色后的溶液
First, the introduction of high content of bismuth analysis, the current general use of EDTA volumetric method. This test based on thiourea colorimetry, determination of high content of bismuth by the whole differential method. Thiourea colorimetric method has more interference than other colorimetric methods, but it is not the main contradiction for the analysis of high content of bismuth. Because of its low molar extinction coefficient, ε 479 = 9 × 10 -3 , Is suitable for high content determination. More prominent problem of the original thiourea colorimetric solution is not stable enough after the hair color, the summer (room temperature 30 ℃ -40 ℃) for more than 30 minutes may precipitate monomer sulfur turbidity occurs, we adjust the color condition so that significant After the color solution