论文部分内容阅读
纯铜中微量铋的测定,至今为止,大都采用以铁或锰作载体共沉淀与主体分离,然后采用KI或DDTC比色法完成测定。沉淀分离须进行多次,费时,并消耗大量试剂,这给分析工作者带来很大不便。本法于0.3mol/L硝酸溶液中,用二-2-乙基己基磷酸(简称P204)-正庚烷萃取铋使与主体铜分离,再用碘化钾-硫脲混合液反萃取铋,利用铋与碘离子的黄色络合物进行光度测定。经实践证明,该法简单快速,准确度高,选择性较好,适用于纯铜中微量铋的测定。
Determination of trace amounts of bismuth in pure copper, so far, most of the use of iron or manganese as a carrier co-precipitation and the main separation, and then use KI or DDTC colorimetric determination. Precipitation separation to be carried out many times, time-consuming, and consume large amounts of reagents, which brings great inconvenience to the analyst. In this method, bismuth is separated from the main copper by extracting the bismuth with di-2-ethylhexylphosphoric acid (abbreviated as P204) -n-heptane in 0.3 mol / L nitric acid solution, and the bismuth is back extracted with the mixture of potassium iodide and thiourea. Photometry with yellow complex with iodide ion. The practice proved that the method is simple and fast, high accuracy and good selectivity, suitable for the determination of trace amounts of bismuth in pure copper.