Determination of Cadmium in Rice by Atomic Absorption Spectrophotometry with Pretreatment by Low-temperature Asher

Abstract

A study was made from the basic viewpoints of determination of cadmium in rice (especially in unpolished and polished rice) by atomic absorption spectrophotometry after ashing samples at low temperature by means of exited oxygen plasma.Unlike the conventional ashing methods, low-temperature ashing method made it possible to retain Cadmium (Cd) almost completely without its volatilization, thus we have obtained 97.2% in average recovery from the experiments by the addition of Cd to the polished rice, and in the following atomic absorption analysis we have found an excellent linear relation in the calibration range from 0.05 to 1.5ppm in concentration.