微型固相萃取柱结合胃袋式大体积进样-气相色谱-质谱法对食品中205种农药残留快速测定研究

分别选取菠菜、洋白菜、苹果、大米和大豆5种基质，利用微型固相萃取柱对样品进行前处理，采用胃袋式大体积进样技术结合气相色谱-质谱（GC-MS），建立了同时测定13本通关检测项目要求的205种农药残留的快速分析方法。通过增加进样量提高检测灵敏度，通过减少样品处理量缩短前处理时间，以保留时间和特征离子丰度比进行定性，以特征离子强度进行定量。该方法与日本通知法进行了比对，结果表明两种方法净化效果、检出限、回收率和RSD等指标水平相当，平均回收率在80％-120％之间，RSD（n=7）小于10％，满足残留分析方法的要求。

一种用于电热蒸发-原子光谱的微型化固相萃取技术

A new method of combination micro column packed with 2 ethylhexyl hydrogen 2 ethylhexyl phosphonate(P 507 ) extraction resin with electrothermal vaporization inductively coupled plasma atomic emission spectrometry(ETV ICP AES) for separation and determination of trace rare earth elements(lanthanum, europium, yttrium and ytterbium) has been developed. Various influencing factors, such as the acidity of solution, flow rate and the volume of the sample, the length of the micro column on the separation and the preconcentration are examined in detail, the effect of the existence of organic matrix and the pre ashing temperature on determination of rare earth elements by ETV ICP AES has also been studied.

固相萃取技术在农药残留测定中的应用

本文介绍了固相萃取技术的原理和使用，应用该技术测定了柑桔中唑螨酯的残留量。