Nicotinamidoxime as an analytical reagent |
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Authors: | K K Tripathi and D Banerjea |
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Institution: | (1) Department of Inorganic and Analytical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Calcutta-32, India |
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Abstract: | Summary Cobalt(II) gives a deep blue colour with nicotinamidoxime in alkaline aqueous-ethylalcoholic medium which has been used with advantage for the spectrophotometric determination of this metal. The optimum pH for the development of colour is 9.8–11.3 in aqueous-alcoholic (40% v./v.) medium in presence of a large excess of the reagent, at 15–40°C. The colour intensity is measured at 580 m ,. Sensitivity is 0.01 g cobalt per cm2, while visual identification limit is 0.5 g cobalt per ml (1 2·106). Beer's law is obeyed in the range of 0.2–20 ppm of the metal, with an optimum range of 2–16 ppm. The colour is stable for about half an hour in the pN range of 9.8–11.3 and at least one hour in the range of 10.5 to 11.0. On account of the high pN and alcoholic medium used, most of the cations and anions interfere and, hence, must be removed.Part I: See Z. anal. Chem. 168, 326 (1959). |
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