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测定水溶液中微量铋,原子吸收分光光度法是一种快速而灵敏的方法,但一般实验室尚无条件使用。常用的是双硫腙分光光度法。双硫腙与Bi(Ⅲ)离子生成橙红色螯合物,反应非常灵敏,且螯合物能被氯仿完全萃取。用氰化物作掩蔽剂时,方法的选择性良好。但双硫腙的氯仿溶液为绿色,生成的螯合物为橙红色,试液中含有两种有色成份,它们的吸收峰又部份重叠。随着试液中Bi(Ⅲ)含量的增加,双硫腙的绿色变浅,螯合物的橙红色加深。两种有色成份的含量都是变数,因此背景吸收不能用固定量的双硫腙(空白溶液)来消除,
Determination of trace amounts of bismuth in aqueous solution, atomic absorption spectrophotometry is a fast and sensitive method, but the general laboratory is still unconditional use. Commonly used is dithizone spectrophotometry. Dithizone and Bi (Ⅲ) ion generated orange red chelate, the reaction is very sensitive, and the chelate can be fully extracted by chloroform. Cyanide as a masking agent, the method of good selectivity. However, the dithizone solution of chloroform is green, the resulting chelate is orange-red, the test solution contains two colored components, their absorption peaks and partially overlap. With the increase of Bi (Ⅲ) content in the test solution, the dithizone green became lighter and the chelate orange deepened. The content of the two colored components is a variable, so the background absorption can not be eliminated with a fixed amount of dithizone (blank solution)