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Nuclear Chemistry Division Saha Institute of Nuclear Physics 92, Acharya Prafulla Chandra Road Calcutta-9, India.
Both iron(III) and its EDTA complex in 0-1N H(2)SO(4) medium absorb in the ultraviolet region of the spectrum, with absorption maxima at 305 and 258 nm respectively. EDTA can thus be determined by addition of excess of Fe(III) and measurement of the absorbance at the two wavelengths. An EDTA concentration as low as 10(-6)M can be determined with a fair degree of accuracy. The method is free from interferences from most common metal ions, and is simple and rapid.
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