分光光度法测定茶叶中的微量铅(Ⅱ)  

Determination of Trace Lead in Tea with Spectrophotometry

作　　者：刘秋文[1] 刘海莲[1] 

机构地区：[1]忻州师范学院,山西忻州034000

出　　处：《忻州师范学院学报》2011年第5期1-3,共3页Journal of Xinzhou Teachers University

摘　　要：用三氯甲烷作萃取剂,通过Pb2+和双硫腙的配位显色反应,研究了茶叶中微量铅含量的测定方法。实验结果表明:在pH=10.5的三酸缓冲溶液中,有色溶液的最大吸收波长为510nm,Pb2+浓度在0～2.0mg/L的范围内符合朗伯-比尔定律,加标回收率为98.9%～102.2%之间,且重现性较好。本法用于测定茶叶中的Pb2+,方法简单易行,结果可靠[1]。The determination method of trace lead content in tea was studied by Pb2＋ and diphenylthiocarbazone matching place coloration reaction which uses trichloromethane as extraction agent.The results showed that：in pH=10.5 Britton-Robinson buffer solution,coloured solution maximum absorbs wavelength being 510 nm,Pb2＋ concentration accords with Lambert-Beer law within 0~2.0 mg/l range,add the bid coefficient of recovery is 98.9%～102.2%,and reappearance was better.This law used for Pb2＋ in determine tea is simple and reliable.

关 键 词：茶叶 铅 双硫腙 分光光度法 

分 类 号：O657.3[理学—分析化学]