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铅电解液中加入木质素磺酸钙(以下简称木钙),能改善析出铅的表面物理性能,但对木钙的测定尚未见报导。为适应生产需要,试验了分光光度法测定铅电解液中木钙的方法。木钙是一种表面活性剂,经硝酸氧化后生成相应的醌式硝基酯有色物质,通过测量其颜色的吸光度可确定木钙的含量。本法可用于大量金属盐类及其他有机物(例如骨胶、稻草)存在下,电解液中木钙含量的测定,测定范围为0.003—25克。实验表明:至少2克的PbSiF_6;5毫克Cu~(2+)、Zn~(2+)、Bi~(3+)、Ag~+、Fe~(3+);2.5毫克As~(3+)、As~(5+)、Sn~(4+)、CO~(2+)、Ni~(2+)、Se~(4+)、
Adding lead lignin sulfonate calcium (hereinafter referred to as calcium) can improve the surface physical properties of precipitated lead, but the determination of calcium has not been reported. In order to meet the production needs, the method of spectrophotometric determination of calcium in lead electrolyte was tested. Calcium-calcium is a surfactant that is oxidized by nitric acid to form the corresponding quinone nitro-ester colored substance. By measuring the absorbance of its color, the content of calcium can be determined. This method can be used for the determination of the amount of calcium in the electrolyte in the presence of a large amount of metal salts and other organic substances (such as bone glue, straw) in the range of 0.003-25 g. The results showed that: at least 2 g PbSiF 6, 5 mg Cu 2+, Zn 2+, Bi 3+, Ag 2+, Fe 3+, 2.5 mg As 3+ , As ~ (5 +), Sn ~ (4 +), CO ~ (2 +), Ni ~ (2 +), Se ~