Comparison of two digestion methods for determination of cadmium in Pinctada martensii by flame atomic absorption spectrometry

Two kinds of sample digestion methods, high pressure airproof digestion and conventional wet digestion, were tested for determination of cadmium content in Pinctada martensii by flame atomic absorption spectrometry. The results showed that the cadmium contents in Pinctada martensii by high pressure digestion digestion and wet digestion were 60.96 mg/kg and 61.65 mg/kg, respectively. The RSD were less than 3% and the recovery by the two methods were 97.44~101.29% and 96.77~102.19%, respectively. Both of the two methods required relatively simple equipments and low cost. Digestion with high pressure airproof was more facile, convenient and needed less consumption of acid than wet digestion.