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Rapid spectrophotometric determination of manganese(II) with 4-(2-thiazolylazo)-resorcinol

Spektrophotometrische Bestimmung von Mangan(II) mit 4-(2-Thiazolylazo)-resorcin

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Summary

Manganese forms a red chelate with 4-(2-thiazolylazo)-resorcinol at pH 8.8 (borate buffer), and absorbance is measured after 30 s, at 540 nm in the presence of 20%tert-butyl alcohol (by volume). The 1∶2 complex obeys Beer's law for manganese concentration of 0.04–1.4μg per ml, has molar absorptivity 4.176 x 104 and Sandell sensitivity 0.0013μg cm−2. The formation constant (logK) is found to be 9.32, and relative standard deviation ±0.22%. Of the 48 ions studied for interference, only Co(II), Zn(II), Cd(II), Pb(II) and EDTA2− are found to interfere. This method has been applied for the determination of manganese content in alloy steels.

Zusammenfassung

Mangan bildet bei pH 8,8 (Boratpuffer) mit 4-(2-Thiazolylazo)-resorcin ein rotes Chelat, dessen Absorbanz nach 30 sec bei 540 nm in Gegenwart von 20% tert. Butylalkohol gemessen wird. Dieser 1∶2-Komplex entspricht bei einer Mangan-Konzentration von 0,04–1,4μg/ml dem Beerschen Gesetz; seine molare Absorption beträgt 4,176 x 104, die Empfindlichkeit nach Sandell 0,0013μg·cm−2. Die Bildungskonstante (log K) beträgt 9,32, die rel. Standardabweichung ±0,22%. Unter 48 untersuchten Ionen erwiesen sich nur Co(II), Zn(II), Cd(II), Pb(II) und EDTA als störend.-Das Verfahren wurde zur Bestimmung des Mangangehaltes in Stahl verwendet.

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Authors and Affiliations

  1. Department of Chemistry, Indian Institute of Technology, Bombay, India

    U. G. Gaokar & M. C. Eshwar

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  1. U. G. Gaokar
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  2. M. C. Eshwar
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Gaokar, U.G., Eshwar, M.C. Rapid spectrophotometric determination of manganese(II) with 4-(2-thiazolylazo)-resorcinol. Mikrochim Acta 78, 247–252 (1982). https://doi.org/10.1007/BF01206925

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  • DOI: https://doi.org/10.1007/BF01206925

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