邻苯二甲酰亚胺（PI）和灭菌丹总量作为灭菌丹残留限量标准,造成茶叶中灭菌丹检测的假阳性误判,成为阻碍我国茶叶出口主要因素之一。本文优化了QuEChERS前处理条件,建立了气相色谱串联质谱法检测茶叶中PI残留的方法。样品经乙腈提取,多壁碳纳米管、十八烷基硅烷和苯磺基强阳离子交换剂组成的混合分散吸附剂净化。在10、20、50、100βμg∙kg-1添加水平下,回收率为73%~104%,相对标准偏差低于20%。方法定量限为10.0βμg∙kg-1。该方法简便、可靠、准确,灵敏度高,适用于茶叶中PI残留检测。
As folpet residues, phthalimide (PI) and folpet were responsible for a high risk of false positive detection of folpet in tea, which became a major factor restricting the export of Chinese tea. A modified QuEChERS method for the determination of PI residue in tea using gas chromatography-tandem mass was developed and validated. The target analyte was extracted using acetonitrile and the crude extracts were purified using multiwalled carbon nanotubes, octadecyl silica and strong cation exchanger. At the spiked levels of 10, 20, 50 and 100βμg∙kg-1, the average recoveries were from 73% to 104%, and the relative standard deviations were below 20%. The limit of quantification of PI in tea was 10.0βμg∙kg-1. The method was simple, reliable, accurate, sensitive and appropriate for the determination of PI residue in tea.
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