新型高压湿法消解方法在食品检验中的应用

Application Of New High Pressure Hydrothermal Decomposition method in Food Analy

利用新型高压湿法消解前处理方法对普通食品 ,最佳消解条件为 12 0℃时 ,3h ,样品质量 /浓HNO3体积 /H2 O2 体积为 1∶3∶1。铅的回收率在 95 8%～ 10 4 5 % ,铜的回收率在 96 5 %～ 10 2 2 % ,其准确度完全能够满足食品中微量金属元素分析的要求。

A new convenient high pressure hydrothermal decomposition method for detection of metal element in food and organism materials is reported. The food and organism materials can be decomposed quickly and completely under high pressure hydrothermal condition. Considering all sectors, the best decomposition condition for ordinary food and organism material is 120 ℃,3 hours, and the ratio of sample weight(gram)to volume of nitrate acid (millilitre )is 1 to 3, the ratio of sample weight (gram)to volume of H 2O 2(millilitre)is 1 to 1. The recovery of lead in 95 8%～\{104\^5%\} and the recovery of copper is 96 5%～102 2% in this experiment.This modthod is proved to be practical,convenient and accurate.