用TritonX-100-PAN-S作为络合滴定指示剂测定铜  

The Effect of TritonX-100-PAN-S as a Complexometric Titration Indicator in Determining Copper

作　　者：李敏[1] 连国军[1] 

机构地区：[1]温州医学院检验医学与公共卫生学院,浙江温州325000

出　　处：《广东微量元素科学》2004年第2期56-58,共3页Trace Elements Science

摘　　要：研究了用TritonX-100-PAN-S作为络合滴定指示剂测定铜的方法。在pH 4.5的乙酸-乙酸钠介质中,采用PAN-S为指示剂,以TritoX-100增敏、增稳,用EDTA为络合剂滴定铜。结果表明,待测溶液在测定终点前和达到终点时对比度为79 nm,滴定标准偏差为0.039,共存离子的影响小,指示剂在室温下保存至少稳定6个月。可认为用TritonX-100-PAN-S作金属指示剂,能改善反应条件,提高变色灵敏度,是一种优于PAN的金属指示剂。To study the effects of TritonX - 100 - PAN - S as a indicator on determining copper, in the acetic acid and sodium acetate solution (pH 4.5), using TritonX - 100 enhance the sensitivity and stability, PAN-S as indicator, EDTA as complex agent, copper was determined. The results show that the contrast of before and arrive at titration point is 79 nm. Standard devariation of titration is 0.039. There's little interference of other ions, the indicator can be stored six months at least. It concludes the metallochromic indicator TritonX - 100 - PAN - S is better than PAN on determining copper, which can enhance the sensitivity and improve the reaction conditions.

关 键 词：络合滴定 铜 PAN-S 

分 类 号：O657.32[理学—分析化学]