双硫腙水相光度法快速测定水中微量铅

Rapid Determination of Micro Lead with Dithizone Water Phase by Spectrophotometry

研究了在非离子表面活性剂TritonX-100存在下，双硫腙分光光度法测定水中微量铅的方法．检测溶液在波长503nm处有最大吸收峰，铅离子浓度在0—6μg／mL范围内符合比尔定律，铅离子的测定范围已由过去的0—3μg／mL提高到0～6μg／mL．用此方法与原子吸收法作对比，分别测铅合成水样的浓度，偏差为1．3％，可在水相中直接用光度法测定微量铅，是一种简单、快速、准确的方法．

This paper studies the determination of micro lead（ Ⅱ ） in aqueous solution by the dithizone spectrophotometry in the presence of Triton X - 100. The maximum absorbance peak value of test solution is at 503 nm. Lambert - Beer＇s law is obeyed in the range of Pb（ Ⅱ ）0 -6 μg/mL. The determination range of the lead concentration can be extended from 0 - 3 μg/mL to 0 - 6 μg/mL. Compared with atomic absorption method, the difference of the result is only 1.3% , and the content of micro Pb （ Ⅰ） can be directly determined in aqueous medium by spectrophotometry. This method is proved to be simple, rapid and exact.