论文部分内容阅读
锡青铜中微量铅的测定,除光谱、极谱、原子吸收光谱等方法外,常见的打萨腙[1]、PAR[2—4]比色法总是采用氰化物做掩蔽剂,资料[5]介绍了用硫酸钾——硫酸铅复盐沉淀分离铜合金中的铅,用半二甲酚橙发色比色测定铅的方法,避免了使用氰化物,但对含量较低(如0.03%以下)的试料的测定就略感不便,本文试图以硫酸铅——硫酸锶沉淀分离锡青铜中的微量铅,在避免使用氰化物的条件下,用PAR发色,比色测定铅。经过试验,结果是满意的。
Tin bronze trace lead determination, in addition to spectroscopy, polarography, atomic absorption spectrometry and other methods, the common hit the hydrazone [1], PAR [2-4] colorimetric always use cyanide as a masking agent, data [ 5] introduced the use of potassium sulfate - lead sulfate double salt precipitation of copper alloy separation of lead, with semi-xylenol orange hair colorimetric method for the determination of lead, to avoid the use of cyanide, but the content is low (such as 0.03 %) Of the sample slightly inconvenient to measure, this paper attempts to lead sulfate - strontium sulfate tin trace separation of trace amounts of lead in the use of cyanide to avoid the conditions of using PAR color, colorimetric determination of lead. After testing, the result is satisfactory.