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中国农学通报 ›› 2025, Vol. 41 ›› Issue (11): 159-164.doi: 10.11924/j.issn.1000-6850.casb2024-0737

• 食品·营养·检测·安全 • 上一篇    

液液萃取-衍生化/气相色谱-质谱法测定水中6种苯氧羧酸类除草剂

王媛媛1(), 梁晶1, 王玲玲1, 赖晓姗2()   

  1. 1 河南省生态环境监测和安全中心,郑州 450000
    2 新疆维吾尔自治区哈密生态环境监测站,新疆哈密 839000
  • 收稿日期:2024-11-25 修回日期:2025-02-20 出版日期:2025-04-15 发布日期:2025-04-11
  • 通讯作者:
    赖晓姗,女,1986年出生,新疆哈密人,工程师,学士,主要从事环境监测和污染防治方面的研究。通信地址:839000 新疆哈密市伊州区西河街道翰林路15号 哈密市生态环境局,Tel:0902-2236068,E-mail:
  • 作者简介:

    王媛媛,女,1983年出生,河南郑州人,高级工程师,硕士研究生,研究方向:生态环境监测。通信地址:450000 河南郑州郑东新区学理路10号 河南省生态环境监测和安全中心,Tel:0371-66309327,E-mail:

  • 基金资助:
    环境标准制修订项目“水质氯代苯氧酸类除草剂的测定气相色谱-质谱法”(2014-48)

Determination of Six Types of Phenoxy Acid Herbicides in Water by Gas Chromatography-Mass Spectrometry with Liquid-Liquid Extraction and Derivatization

WANG Yuanyuan1(), LIANG Jing1, WANG Lingling1, LAI Xiaoshan2()   

  1. 1 Henan Ecological Environment Monitoring and Safety Center, Zhengzhou 450000
    2 Hami Ecological Environment Monitoring Station in Xinjiang Uygur Autonomous Region, Hami, Xinjiang 839000
  • Received:2024-11-25 Revised:2025-02-20 Published:2025-04-15 Online:2025-04-11

摘要:

本研究建立了一种可同时测定水中6种苯氧羧酸类除草剂的气相色谱-质谱法。水样经二氯甲烷液液萃取、脱水浓缩后,在碳酸钾催化下经五氟苄基溴衍生,衍生物进气相色谱-质谱分析。样品经Rtx-5ms毛细管色谱柱分离,采用选择离子扫描模式检测,内标法定量。结果表明:在最优实验条件下,6种苯氧羧酸类除草剂在质量浓度0.5~20.0 μg/mL范围内线性关系良好,相关系数不低于0.999。方法检出限为0.2 μg/L,精密度范围2.2%~6.9%。采用该方法对地下水、地表水、海水、生活污水和工业废水样品进行加标回收试验,基体加标回收率在83.0%~113%之间。该方法精密度较好、回收率稳定,为水中苯氧羧酸类除草剂的检测提供了一种有效的解决方案。

关键词: 液液萃取, 衍生化, 气相色谱-质谱法, 苯氧羧酸类除草剂, 分析方法

Abstract:

A method for determination of 6 phenoxy acid herbicides in water by gas chromatography-mass spectrometry was established. After liquid-liquid extraction with dichloromethane, the extract was dehydrated and concentrated, then derivatized with PFBBR under the catalysis of potassium carbonate. The derivatives were analyzed by gas chromatography-mass spectrometry. Samples were separated by Rtx-5ms capillary chromatography column, detected by SIM mode, and quantified by internal standard. The results showed that under the optimal experimental conditions, 6 phenoxy acid herbicides showed good linear relationships in the concentration range of 0.5 to 20.0 μg/mL, the correlation coefficient was not less than 0.999. The detection limit was 0.2 μg/L, and the precision range was 2.2%-6.9%. The spiked tests were conducted on groundwater, surface water, seawater, domestic sewage, and industrial wastewater samples, and the recovery range was 83.0%-113%. Results showed that this method had good precision and stable recovery, providing an effective solution for the detection of phenoxy acid herbicides in water.

Key words: liquid-liquid extraction, derivatization, gas chromatography-mass spectrometry, phenoxy acid herbicides, analysis method