奶粉中二噁英类化合物的检测

Determination of PCDDs/PCDFs in Milk Power by Isotope Dilution HRGC/HRMS

目的 采用高分辨气相色谱 /高分辨双聚焦磁式质谱联用仪 (HRGC/HRMS)定量检测奶粉中二英类化合物。方法 采用索式抽提和自动纯化系统等仪器对奶粉样品中的二英组分进行纯化和富集 ,采用同位素稀释法 ,以HRGC/HRMS联用仪检测。结果 同位素标准物的回收率分布于 90 6%～ 116 3 %之间 ,CRM 5 3 4的检测结果均在标准值范围之内 ,3次实验结果的RSD <2 0 % ,该方法检测下限可达pg/g水平。 结论 该方法灵敏、定性、定量准确 ,为目前国际上权威机构认可的二英定量检测方法。

Objective 2,3,7,8-Chlorine-Substiturted Dibenzo-p-dioxins and furans in milk power were determined by HRGC/HRMS Methods Dibenzo-p-Dioxins and Dibenzo-Furans were extracted from milk power by Soxhlet extraction,cleaned up by FMS and quantified by HRGC/HRMS-MID,using isotope dilution methodology Results The recovery was 90 6%～116 3%,the concentration of PCDDs/PCDFs in CRM534 was in the range of certifined value,and RSD was less than 20 percent PCDDs/PCDFs in milk power can been measured at pg/g level by this method Conclusions The method is sensitive and accurate