Simultaneous Determination of Cobalt and Nickel in Wastewater with 2-Hydroxyl-5-benzeneazoformoamithiozone by Spectral Correction Technique

A new chromogenic reagent, 2‐hydroxyl‐5‐benzeneazoformoamithiozone (HBASA) was synthesized and it can complex Co(II) and Ni(II) at pH 6.0 with high sensitivity and good selectivity. The complexations were characterized by a spectral correction technique. Complexes Co(HBASA)2 and Ni(HBASA) were forme...

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Bibliographic Details
Published in:Journal of the Chinese Chemical Society (Taipei) 2005-12, Vol.52 (6), p.1145-1152
Main Authors: Hu, Nai-Liang, Gao, Hong-Wen, Zhang, Biao, Zhan, Guo-Qing
Format: Article
Language:English
Subjects:
2-Hydroxyl-5-benzeneazoformoamithiozone
Determination of Co and Ni
Metal complex
Spectral correction technique
Spectrophotometry
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Summary:A new chromogenic reagent, 2‐hydroxyl‐5‐benzeneazoformoamithiozone (HBASA) was synthesized and it can complex Co(II) and Ni(II) at pH 6.0 with high sensitivity and good selectivity. The complexations were characterized by a spectral correction technique. Complexes Co(HBASA)2 and Ni(HBASA) were formed and their stepwise stability constants (Kn) and stepwise molar absorptivities (ϵn) were worked out. The spectral correction matrix method was applied to the simultaneous determination of Co and Ni. At the range from 0 to 12.0 μg/25‐mL Co and Ni, the correction absorbances (Aβ) of the mixed complexes' solutions have good linearity. The limit of detection is 0.01 mg/l Co and 0.03 mg/l Ni and the relative standard deviation (RSD) is 2.5% for Co and 5.6% for Ni. This method was applied to the analysis of wastewater. The recovery of Co was between 94.5 and 109% and that of Ni between 99.0 and 111%.
ISSN:0009-4536
2192-6549
0009-4536
DOI:10.1002/jccs.200500164