摘要
本文应用流动注射分析技术为痕量钴、镍和镉的火焰原子吸收光谱测定建立了一个有效的在线共沉淀预浓集系统。钴、镍和镉离子在弱酸性介质中与ＡＰＤＣ－Ｆｅ２＋产生共沉淀，共沉淀反应和沉淀收集在编结反应器中同时进行。用甲基异丁基甲酮溶洗沉淀在线引入火焰原子化器中进行测定。分析速度为７２样／ｍｉｎ，样品消耗量为１．１ｍｌ以及装样时间３０ｓ时，测定钴、镍和镉获得的增感系数分别为４２、３０、３３。测定含量水平分别为２０．０、１００．０和１０．０μｇ／ｌ，钴、镍和镉的相对标准偏差为２．３％、２．０％和２．４％（ｎ＝１１）。测定钴、镍和镉的检出限（３σ）分别为１．０、３．０和０．３μｇ／ｌ。
An efficient on-line coprecipitation system was developed for flame atomic absorption spectrometry (FAAS) using a flow injection technique. Cobalt, nickel and cadmium were coprecipitated with ammonium pyrrolidinedithiocarbamite (APDC) -Fe complex, and the precipitate was collected on a knotted reactor (KR) made of 250cm long 0. 5mm. i. d,PTFE tube without filter. The precipitate was dissolved by MIBK and directly introduced into the spectrometer. Enhancement factors were 42, 30 and 33 for Co,Ni and Cd,respectively,and the corresponding detection limits were 1, 3 and 0. 3 μg/L, respectively. The RSD were 2. 3% for 20. 0μg/L Co, 2. 0% for 100μg/L Ni, and2. 4% for 10. 0μg/L Cd. The analytical results obtained for determination of Co in standard reference bovine liver (NBS1577a) and Ni, Cd in standard reference urine (GBW09103) agreed well with the recommended values.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
1994年第1期85-90,98,共7页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金
关键词
流动注射
钴
镍
镉
原子吸收光谱
Flow-injection analysis, Coprecipitation, FAAS, Cobalt, Nickel and cadmium
