Spectrophotometric determination of copper,cobalt,nickel,and tellurium after extraction with morpholine-4-carbodithioate into molten naphthalene.

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概要

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• Potassium morpholine-4-carbodithioate has been examined as a reagent for the spectrophotometric determination of copper, cobalt, nickel and tellurium after extraction into molten naphthalene. The extracted mixture of metal complex and naphthalene was dissolved in chloroform and the trace amounts of these metals determined spectrophotometrically. Beer's law holds in the concentration range Cu: 5.0–70.0, Co: 5.0–81.0, Ni: 6.0–90.0, and Te: 5.7–125.0 μg per 10 ml of the final solution. The molar absorptivity and sensitivity are calculated to be Cu: 1.067×10<SUP>4</SUP> mol<SUP>−1</SUP> cm<SUP>−1</SUP>, 0.0059 μg/cm<SUP>2</SUP> (440 nm), Co: 1.350×10<SUP>4</SUP> mol<SUP>−1</SUP> cm<SUP>−1</SUP>, 0.0043 μg/cm<SUP>2</SUP> (360 nm), Ni: 7.920×10<SUP>3</SUP> mol<SUP>−1</SUP> cm<SUP>−1</SUP>, 0.0088 μg/cm<SUP>2</SUP> (390 nm), and Te: 1.075×10<SUP>4</SUP> mol<SUP>−1</SUP> cm<SUP>−1</SUP>, 0.0110 μg/cm<SUP>2</SUP> (415 nm). Aliquots containing 25.0 μg of copper, 27.0 μg of cobalt, 24.0 μg of nickel and 25.5 μg of tellurium gave a mean absorbance of 0.420, 0.620, 0.270, and 0.215 with a relative standard deviation of 0.0016, 0.0024, 0.0015, and 0.0013 respectively. The interference of various ions has been studied in detail. Only cobalt interfered in the determination of nickel which was eliminated by extraction first at low pH. Methods were developed for the determination of copper, cobalt and nickel in various alloys. A method was also developed for simultaneous determination of tellurium and selenium in the pure solution, based upon the thermal instability of seleniumelided carbodithioate complex.

• 公益社団法人 日本化学会の論文

著者

• Puri B.

  Department Of Chemistry Indian Institute Of Technology

• Gautam Mamta

  Department of Chemistry, Indian Institute of Technology

• Bansal R.

  Department of Chemistry, Indian Institute of Technology

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• Spectrophotometric determination of copper,cobalt,nickel,and tellurium after extraction with morpholine-4-carbodithioate into molten naphthalene.
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