AbstractThe authors describe a method for the extraction of the herbicide 2-methyl-4-chlorophenoxyacetic acid (MCPA) from agricultural products. The metal organic framework (MOF) HKUST-1 (a copper(II) benzene-1,3,5-tricarboxylate) was used as a sorbent for efficient clean-up and preconcentration of MCPA. The effects of pH value, stirring time, amount of sorbent on extraction were optimized by central composite design. Ultrasonic waves were used for desorption procedure and its advantage was demonstrated for an increase in extraction recovery. Corona discharge ion mobility spectrometry (IMS) was then applied for fast and sensitive determination of MCPA. The method was validated in terms of sensitivity, recovery and reproducibility. Under the optimum conditions the calibration plot is linear between 0.035–0.200 μg. L−1. The detection limit is 10 ng L−1, with relative standard deviations of <5%. Real samples (water, soil and agricultural product) were spiked and then analyzed by this method, and the results revealed efficient solid phase extraction and recovery. Graphical abstractSchematic presentation of a procedure for extraction of an organochlorine pesticide (2-methyl-4-chlorophenoxyacetic acid) from agriculture products using the HKUST-1 metal-organic framework prior to determination by ion mobility spectrometry based on its ionization in drift cell.

中文翻译：

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HKUST-1 金属有机骨架，用于 2-甲基-4-氯苯氧乙酸 (MCPA) 的分散固相萃取，然后再通过离子迁移谱法测定

摘要 作者描述了一种从农产品中提取除草剂 2-甲基-4-氯苯氧乙酸 (MCPA) 的方法。金属有机骨架 (MOF) HKUST-1（一种铜 (II) 苯-1,3,5-三羧酸盐）用作吸附剂，用于高效净化和预浓缩 MCPA。通过中心复合设计优化pH值、搅拌时间、吸附剂用量对萃取的影响。超声波用于解吸过程，其优势被证明可以提高提取回收率。然后应用电晕放电离子迁移谱 (IMS) 快速、灵敏地测定 MCPA。该方法在灵敏度、回收率和重现性方面得到了验证。在最佳条件下，校准曲线在 0.035–0.200 μg 之间呈线性关系。L-1。检测限为 10 ng L-1，相对标准偏差 <5%。将实际样品（水、土壤和农产品）加标，然后通过该方法进行分析，结果表明固相萃取和回收效率很高。图形摘要示意图展示了使用 HKUST-1 金属-有机骨架从农产品中提取有机氯农药（2-甲基-4-氯苯氧乙酸）的过程，然后基于其在漂移池中的电离通过离子迁移谱法进行测定。