玄米中のカドミウムの原子吸光分析のための低温灰化法

抄録

In order to save time required for a low-temperature ashing (usually 18∼20 hrs) for the determination of cadmium in unpolished rice, pre-treatment of rice samples in an electric furnace at different temperatures was conducted and the efficiency of ashing was examined. The opti- mum conditions of ashing was found as follows: 5 g of unpolished rice was weighed and ashed for hrs in a chamber of a low-temperature asher under 150 ml/min oxygen flow and consuming 200 W of RF power, after treating 3 hrs in an electric furnace (260∼280°C).
The ashed sample was dissolved in an acid, and trace amounts of cadmium were determined by assuming that the loss did not occur by ashing. The present method was applied to unpolished rice samples and the results are shown.