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Volume 45, Number 1
(January - February 2000) |
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Volume 45, Number 1
(January - February 2000) |
A Rapid Method for the Spectrophotometric Determination of Iron in Silicate Rocks
by Pranab K. Tarafder1 and Anil K. Sardana2
1Regional
Centre for the Exploration and Research, Atomic Minerals Division, Department
of Atomic Energy, Nongmynsong, Shillong, India
2Chemical
Laboratory, AMD, Department of Atomic Energy, R.K. Puram, New Delhi, India
Key words: spectrophotometry, iron, silicate rocks, 2,3-dihydroxynaphtalene
A sensitive and selective method for the rapid determination of iron in silicate rocks has been devised using the reagent, 2,3-dihydroxynaphtalene. The molar absorptivity at 452 nm and Sandell`s sensitivity of the method are 1.1 x 104 l mol-1 cm-1 and 0.005 mg cm-2, respectively. The Beer`s low is obeyed over a vide range from 0.04 to 10 mg ml-1 of iron. The selectivity of the method has been improved by extraction spectrophotometry. The method has been applied to number of diverse silicate rock samples and results obtained are found to be favourably comparable with those obtained from 1,10-phenanthroline and iron methods. The method is better than that of the tiron in terms sensitivity and selectivity. The reagent used here is a better variant of tiron for iron determination.
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