Determination of Cadmium in Rice and Soil by Means of Atomic Absorption Spectroscopy Using an APDC-chloroform Extraction System

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Determination of cadmium in rice and soil by means of atomic absorption spectroscopy was examined using an APDC-Chloroform extraction system.<BR>An APDC (ammonium pyrrolidinedithiocarbamate) -chelate of cadmium was extracted from the sample solution into chloroform which had seemed unsuitable to a solvent for atomic absorption spectroscopy, followed by direct spraying to a air-hydrogen flame. The flame was quite stable and the background was vanishingly small at 2288 Å (resonance line of cadmium). The proposed method of determination was scarcely subjected to the interference from other metals, because of the excellent solubility of APDC-chelate in chloroform.<BR>Experimental conditions including hollow cathode lamp current, gas pressure and pH of the sample solution etc. were examined and the calibration curve gave a straight line in the range of 0.02-1.0ppm of cadmium. On the basis of these result, a method for determination of cadmium was established and has been proved to be simple, convenient and moreover accurate by practical application to analysis of cadmium in rice and soil.
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