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高铅青銅中含銅65%左右,鉛30%左右,铁0.15%以下,磷0.1%以下,其他元素含量甚微。銅的测定我們采用碘量法;铁、磷采用比色法;現将我們采用的铅的絡合滴定法介紹于下,仅有关单位参考。 1956年GBoItz等制訂过铅青銅中铅的絡合滴定法,他們是以絡黑T为指示剂,氰化鉀隐蔽銅后进行测定的。我們认为在大量分析时采用氰化鉀是不方便的。R蒲希比认为应用二甲酚橙为指示剂,在PH5-6间測定铅是个很好的方法。A.N.kaporeB等进一步指出滴定終了时的溶液PH为5.4～5.9间指示剂变化最为明显。
High-lead bronze contains about 65% copper, about 30% lead, less than 0.15% iron and less than 0.1% phosphorus, with little other elements. We use the determination of copper iodine method; iron, phosphorus by colorimetric method; now we use the complexation of lead titration method introduced below, only the relevant units. In 1956, GBoItz et al. Formulated the complexometric titration method for lead in lead bronze. They measured the concealed copper after concealing potassium cyanide with indicator T on black. We consider it inconvenient to use potassium cyanide in a large number of analyzes. R Pohjibi believes that the use of xylenol orange as an indicator of lead in the PH5-6 is a good method. A.N.kaporeB further pointed out that the end of the titration solution PH is 5.4 to 5.9 indicator changes the most obvious.