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近年来EDTA络合滴定已广泛的被应用于SO_4″的测定,其方法是在试液中加入过量的Ba¨,使成BaSO_4沉淀,过量的Ba¨在有Mg¨存在和pH=10的缓冲溶液中以铬黑T为指示剂用标准EDTA溶液滴定。或加入过量的Ba¨使生成BaSO_4沉淀后,再加入过量的EDTA与Ba¨络合,而以氯化镁的标准溶液返滴剩余的EDTA,也采用铬黑T为指示剂。或采用二甲酚橙为指示剂,在pH5.6—6.0间进行铅的络合滴定以测定硫酸盐的含量。松井进作等采用铬黑T与甲基红混合指示剂,终点由酒红色变
In recent years, EDTA complexometric titration has been widely used in the determination of SO 4 ", by adding excess Ba ¨ in the test solution to precipitate BaSO 4, excess Ba ¨ in the presence of Mg ¨ and pH = 10 buffer Titration with a solution of chromium black T standard EDTA solution titration or excess Ba ¨ BaSO4 generated precipitation, and then add an excessive amount of EDTA and Ba ¨ complexation, and magnesium chloride standard solution back drop of the remaining EDTA, Chromium black T is also used as an indicator or the use of xylenol orange as an indicator at pH 5.6-6.0 complexation titration of lead to determine the sulfate content of Matsui Jin et al use of chromium black T and methyl Mixed red indicator, the end point from wine red