摘要
本文研究了在ｐＨ９．０和有Ｔｗｅｅｎ－８０存在下非水溶性试剂ｍｅｓｏ－四（４－溴苯基）卟啉与铅的络合反应条件，络合物的最大吸收波长为４６８ｎｍ，组成摩尔比为１∶１，铅含量在０～２４μｇ／２５ｍＬ范围内有较好的线性关系，表观摩尔吸光系数为２．８７×１０￣５，用于烟草中痕量铅的测定，结果令人满意。
Spectrophotometric determination oflead in tobacco has been described.In thepresence of Tween-80,the complex can formwithin 3 minutes in a boiling water bath atthe pH range of 8.5～9.5.The Soret band ofthe complex lies at 468nm. Beer’ s law isobeyed for lead in the range of 0～24μg/25mL.The molar ratio of complex is 1∶1,of apparent molar absorptioity is 2.8 × 10￣5L.mol￣(-1).cm￣(-1).This method has been appliedto determine lead in tobacco with satisfactoryresults as compared with AAS method.
出处
《分析试验室》
CAS
CSCD
北大核心
1995年第2期58-60,共3页
Chinese Journal of Analysis Laboratory
关键词
铅
烟草
卟啉
分光光度法
lead determination
por-phyrin
pectrophotometry.
