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Determination of micro-amounts of nickel by extraction-spectrophotometry with 2,2'-dipyridyl-2-benzothiazolylhydrazone and increase of its sensitivity by analogue-derivative spectrophotometry

Bestimmung von Mikromengen Nickel durch Extraktions-Spektrophotometrie mit 2,2'-Dipyridyl-2-benzothiazolylhydrazon und Erhöhung der Empfindlichkeit durch Sekundär-Spektrophotometrie

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Summary

A simple, sensitive and selective procedure for the extractionspectrophotometric determination of nickel has been developed. Nickel forms a 1∶2 (metal:ligand) water-insoluble complex with 2,2'-dipyridyl-2-benzothiazolylhydrazone (DPBH), which can be quantitatively extracted into benzene from aqueous medium of pH 4.0–10.3. The complex shows maximum absorption at 480 nm, with a molar absorptivity of 5.4×104l·mole−1·cm−1. The method has been applied to the determination of nickel in iron and steel samples. The sensitivity can be increased by use of second derivative spectrophotometry.

Summary

Ein einfaches, empfindliches und selektives Verfahren für die Extraktion-spektrophotometrische Bestimmung von Nickel wurde ausgearbeitet. Dieses bildet mit 2,2'-Dipyridyl-2-benzothiazolylhydrazon (DPBH) einen wasser-unlöslichen Komplex (Metall:Ligand=1∶2), der sich aus wäßrigem Medium bei pH 4,0–10,3 quantitativ mit Benzol extrahieren läßt. Dieser Komplex hat ein Absorptionsmaximum bei 480 nm; die molare Absorptivität beträgt 5,4×104l·mol−1·cm−1. Das Verfahren wurde zur Nickelbestimmung in Eisen- und Stahlproben verwendet. Seine Empfindlichkeit läßt sich durch Sekundär-Spektrophotometrie erhöhen.

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Authors and Affiliations

  1. Chemical Research Institute of Non-Aqueous Solutions, Tohoku University, Sendai, Japan

    Hajime Ishii, R. B. Singh & Tsugikatsu Odashima

Authors
  1. Hajime Ishii
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  2. R. B. Singh
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  3. Tsugikatsu Odashima
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On study leave from Bareilly College, Bareilly-243005, India.

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Ishii, H., Singh, R.B. & Odashima, T. Determination of micro-amounts of nickel by extraction-spectrophotometry with 2,2'-dipyridyl-2-benzothiazolylhydrazone and increase of its sensitivity by analogue-derivative spectrophotometry. Mikrochim Acta 81, 149–158 (1983). https://doi.org/10.1007/BF01202689

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  • DOI: https://doi.org/10.1007/BF01202689

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