摘要
提出了在高酸度下流动注射在线共沉淀预富集－火焰原子吸收法测定痕量铅的新体系。在０．５ｍｏｌ／ＬＨＣｌ介质中痕量铅与ＤＤＴＣ－Ｚｎ螯合物产生共沉淀。在线生成的沉淀物收集在编结反应器中，用甲基异丁酮溶解沉淀并直接引入火焰原子化器中进行测定。经４０ｓ富集，检测限为２．７μｇ／Ｌ。测定含量为２００μｇ／Ｌ的铅时，相对标准偏差为１．３％。
A flow injection on line coprecipitation system operating at high acidity is proposed to be coupled to flame atomic absorption spectrometry for trace lead determination.Lead is coprecipitated with zinc diethyldithiocarbamate in 0.5 mol/L HCl.The precipitate is collected in a knotted reactor,and then eluted and transferred into the AAS nebulizer with methyl isobutyl ketone.A detection limit of 2.7 μg/L can be achieved with a 40 second preconcentration period.The relative standard deviation is 1.3% for 200 μg/L Pb.The proposed method has been successfully applied to the determination of trace lead in human hair and water samples.
出处
《分析测试学报》
CAS
CSCD
1997年第1期22-26,共5页
Journal of Instrumental Analysis
基金
浙江省分析测试基金
浙江省教委科学基金
关键词
流动注射
在线预富集
火焰原子吸收
铅
毛发
水
Flow injection on line preconcentration
Atomic absorption spectrometry
Lead.
