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Simultaneous analysis of Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) by spectrophotometry and the Kalman filter
Author(s) -
Shi Leming,
Li Zhiliang,
Xu Zhihong,
Pan Zhongxiao,
Wang Leshan
Publication year - 1991
Publication title -
journal of chemometrics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.47
H-Index - 92
eISSN - 1099-128X
pISSN - 0886-9383
DOI - 10.1002/cem.1180050307
Subject(s) - spectrophotometry , chemistry , nickel , copper , zinc , atomic absorption spectroscopy , cationic polymerization , cadmium , ternary operation , cobalt , analytical chemistry (journal) , nuclear chemistry , inorganic chemistry , chromatography , physics , organic chemistry , computer science , quantum mechanics , programming language
This paper describes the simultaneous determination of cobalt, nickel, copper, zinc and cadmium by spectrophotometry and the Kalman filter method. Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) react with 5‐bromo‐2‐(2‐pyridylazo)‐5‐diethylaminophenol (5‐Br‐PADAP) in the presence of cationic surfactant cetyl pyridinium bromide (CPB) to form five different coloured ternary complexes. The absorption curves of these complexes overlap severely in the scanning range 500–620 nm. The Kalman filter algorithm is successfully applied to resolve the overlapped absorption curves and therefore makes the simultaneous determination of these metallic ions possible without tedious pretreatment. The proposed method is applied to analyse the titled elements in synthetic samples and in environmental samples such as hair, fingernail and river water samples with satisfactory results.