利用原子荧光光谱法测定生鲜乳中总砷的方法探讨

摘要

The determination of total arsenic and inorganic arsenic in food (GB5009.11-2014) is methodology foundation and research subject of this experiment. This experiment detects arsenic in fresh milk by using Atomic Fluorescence Spectrometry after digestive treatment in hermetical pressure digestion tank. This experiment discussed the method of arsenic in raw milk, and the method was improved and optimized, tested and validated. As a consequence, the improved method is more sensitive than the old. The detection limit is 0.004 mg/kg. Precision RSD value is 0.98%. Standard addition recovery rate is 100.7%. The improved and optimized method is simple in operation, and has higher precision and recovery rate. It's more convenient for promoting and using.%本试验以食品卫生标准中砷的测定方法(GB/T5009.11-2014)为基础,采用密闭式压力消解罐对生鲜乳进行消化处理,使用原子荧光光谱仪对生鲜乳中的砷含量进行了测定.试验探讨了食品卫生标准中总砷的测定方法,并对该方法进行了改进、优化和验证.结果表明:改进后的方法灵敏度大幅提高,检出限达到0.004mg/kg、精密度的RSD值为0.98%、回收率达到100.7%,相比原方法,新方法灵敏度高、精密度好、回收率高,省时省力,操作简单,便于推广和使用.