摘要
本文研究了弱酸性介质中钴（Ⅱ）与ＴＰＰＳ４的显色反应条件。实验发现胺类化合物质子化后，不参与成络反应，而均能使ＴＰＰＳ４试剂的吸光度大大降低，从而提高了测定的灵敏度，Ｃｏ（Ⅱ）－ＴＰＰＳ４络合比为１：１，ε＿（４２６）＝３．５４×１０￣５，钴含量在０～５．０μｇ／２５ｍＬ范围内呈线性，并用于烟草、茶叶中痕量钴的测定，得到了满意的结果。
he condition of the color reaction ofmesotetrakis(4-sulfophenyl)porphyrin with Co(Ⅱ)were studied in the presence of ethylene diamine andsome other aminocompounds at pH4.0.It was foundthat the protonated aminocompound can react withTPPS_4 and become electroneutral,therefore theabsorption of TPPS_4 declines and the sensitivity of thecomplex increases,The complex has maximumabsorption at 426nm with a mola absorbtivitycofficient of 3.54 ×10￣5L. mol￣(-1). cm￣(-1).The calibrationcurve is linear in the range of 0 to 5 μg/25mL for Co(Ⅱ),This method has been applied to thedetermination of Co(Ⅱ)intea-leave and tobacco withsatisfactory results.
出处
《分析试验室》
CAS
CSCD
北大核心
1994年第6期56-58,共3页
Chinese Journal of Analysis Laboratory
关键词
卟啉
钴
显色反应
Cobalt
spectropho to metry
porphyrin
ethylene diamine
