新型活性炭纤维固相微萃取衍生化与GC-MS联用测定牛奶中的碘

Determination of iodine in milk by activated carbon fiber-solid phase microextraction coupled with derivatization GC-MS

优化了影响新型活性炭纤维衍生化固相微萃取（ACF-SPME）效率的萃取时间、萃取温度、解析时间、解析温度以及离子强度等主要条件。碘的检出限为0．1μg／L，线性范围为1～500μg／L，相对标准偏差（RSD％）为6．9％。方法用于牛奶样品分析，样品的加标回收率为86％。活性炭纤维与商用纤维相比，具有吸附量大，成本低，使用寿命长和耐高温等优点，是一种有发展前景的固相微萃取纤维。

An accurate and precise method is proposed for the determination of iodine in milk by homemade activated carbon fiber-solid phase microextraction （ACF-SPME） coupled with derivatization GC-MS. Under optimized conditions, the linear range obtained was from 1 to 500μg/L. The limit of detection （LOD） was 0.1μg/L. This method has successfully been applied to the determination of iodine in milk. The mean recoveries was 86% with the relative standard deviation （RSD） of 6.9%. Compared with commercial fibers, ACF has many advantages, such as low cost, longer lifetime and better endurance to high temperature, which is a promising alternative for the solid phase microextraction procedure.