全自动石墨消解法在检验粮食中总砷的应用

通过测试石墨消解仪的参数，分析比较石墨消解法和微波消解法两种前处理方法对测定大米中总砷的结果影响。试验结果表明，石墨消解法消解大米标准样品测定总砷的相对标准偏差为5.25%~ 6.86%，检验结果与标准值的相对误差为5.66%~7.55%；微波消解法消解大米标准样品测定总砷的相对标准偏差为8.67%~12.20%，检验结果与标准值的相对误差为17.9%~21.7%。石墨消解法的准确度与精密度比微波消解法有明显的提高。

Application of Automatic Graphite Digestion Method in Inspection of Total Arsenic in Grain Inspection

By testing the parameters of graphite digestion instrument, the effects of graphite digestion method and microwave digestion method on the determination of total arsenic in rice were analyzed and compared. The results showed that the RSD of rice standard sample digested by graphite digestion method was 5.25%~6.86%, and the relative error between the test result and the standard value was 5.66%~7.55%. The RSD of rice standard sample digested by microwave digestion method was 8.67%~12.26%, and the relative error was 17.96%~21.7%. The accuracy and precision of graphite digestion method are higher than that of microwave digestion method.