【摘要】 目的:建立电感耦合等离子体质谱(ICP-MS)法直接测定酱油中铅的方法。方法:酱油经适当稀释后直接进样测定,外标法绘制工作曲线、在线内标校准基体效应及信号漂移。结果:相对标准偏差<3.0%,加标回收率95.8%~104.3%,用该方法对CNAS能力验证酱油样品进行了测定,测定结果令人满意。结论:该方法样品前处理简单,方法准确、灵敏、快速,检出限低,精密度好。更多还原

【Abstract】 Objective:To develop a method for the determination of lead in soybeam sauce by using ICP-MS.Methods:The sample was 1:10 diluted with 1% HNO3 and then introduced into ICP-MS.External calibration was applied for making calibration curve and on-line internal calibrtion for eliminating matrix effect and signal drift,respectively.Results:The relative standard deviations(RSD) was <3.0% and the recovery percentages were between 94.2%~104.3%.The approach was validated using soybeam sauce reference sample during CNAS test,the analytical value matched very well the certified value.Conclusion:This is a simple,sensitive and accurate method to determine lead in soybeam sauce.更多还原