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Extraction Spectrophotometric Method for the Determination of Uranium in Geological Samples Using a Ternary Complex of 2-(p-Methylphenylazo)pyridine and Thiocyanate

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Abstract

An uranyl ion (UO22+) reacts with 2-(p-methylphenylazo)pyridine in thiocyanate system. The species is extractable quantitatively into methyl isobutyl ketone (MIBK) in the presence of nitrate ion, showing an absorption maximum at 370 nm. Beer’s law is obeyed over the range 0.15-1.5μg of uranium/ml. The molar absorptivity and Sandell’s sensitivity are 0.166×104 lmol−1 cm−1 (on the basis of uranium content) and 0.0014 μg/ cm2, respectively. Various international geochemical reference samples were chosen to check the validity of the method. The results obtained were in good agreement with the published data.

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Author notes

  1. Partha Chattopadhyay

    Present address: Regional Research Laboratory, C. P. A. F. Division, Bhubaneswar-, 751 013, India

Authors and Affiliations

  1. Geological Survey of India, Chemical Laboratory, Nongrim Hilk, Shillong-, 793 003, India

    Partha Chattopadhyay & Tapan Kumar Sinha

  2. Regional Sophisticated Instrumentation Centre, North-Eastem Hill University, Shillong-, 793 003, India

    T. S. Basu Baul

Authors
  1. Partha Chattopadhyay
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  2. Tapan Kumar Sinha
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  3. T. S. Basu Baul
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Chattopadhyay, P., Sinha, T.K. & Baul, T.S.B. Extraction Spectrophotometric Method for the Determination of Uranium in Geological Samples Using a Ternary Complex of 2-(p-Methylphenylazo)pyridine and Thiocyanate. ANAL. SCI. 7, 931–933 (1991). https://doi.org/10.2116/analsci.7.931

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  • DOI: https://doi.org/10.2116/analsci.7.931

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