Extraction-spectrophotometric determination of nickel as Ni-(PAR)2-(CTAB)2 complex in polymetallic sea-bed nodules and steels |
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| Authors: | S. N. Bhadani Madhu Tewari Archana Agrawal K. Chandra Sekhar |
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| Affiliation: | (1) Department of Chemistry, Ranchi University, Ranchi, India;(2) Analytical Chemistry Division, National Metallurgical Laboratory, 831 007 Jamshedpur, Bihar State, India |
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| Abstract: | A red, water-soluble complex of nickel with PAR can be extracted into chloroform with CTAB at pH 7.0. The system obeys Beer's law upto 0.5  g/ml with a molar absorptivity of 45 200 L·mol–1·cm–1 at 540 nm. Job's method of continuous variations revealed that the composition of the extracting species is 1:2:2 for nickel:PAR:CTAB. Based on this extraction, a highly sensitive and selective spectrophotometric method for the determination of nickel in polymetallic sea-bed nodules and in steels, after prior separation of iron and manganese, was developed. The standard deviation was 0.04–0.127 g for 5–25 g of nickel. |
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