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从复杂的土壤中提取半挥发性有机化合物 (SVOCs) 的改进QuEChERS方法的开发和验证

Hongbo Lou^1,2, Fujia Wang^1,3, Hangchen Zhao¹

¹Environmental Testing and Experiment Center, Chinese Research Academy of Environmental Sciences, Beijing 100012, China. x.w.wang@outlook.com.

Analytical methods : advancing methods and applications

|September 12, 2023

概括

一种新方法使用优化的QuEChERS提取和GC-MS分析快速确定土壤中的63种半挥发性有机化合物 (SVOC). 这种方法快速,准确,环保,大大减少了溶剂使用和分析时间.

科学领域:

环境化学环境化学
分析化学分析化学
绿色化学绿色化学

背景情况:

半挥发性有机化合物 (SVOC) 是常见的土壤污染物,需要敏感的检测方法.
在土壤中测定SVOC的现有方法可能是耗时的,溶剂密集的,可能涉及多个提取步骤.
需要用于土壤SVOC分析的快速,高吞吐量和环保的分析技术.

研究的目的:

开发和验证一种快速,灵敏和高通量方法,用于在土壤样本中确定63种SVOC.
优化QuEChERS (快速,轻松,廉价,有效,坚固和安全) 提取技术用于土壤矩阵.
在效率和环境影响方面,将开发的方法与现有的标准方法 (如EPA 3545) 进行比较.

主要方法:

优化QuEChERS提取技术,使用一个小的土壤样本 (5.0 g) 与乙/n-hexane混合物.
使用铜粉和八甲基 (C18) 分散剂的混合物进行净化,然后进行过.
使用气体染色体质谱法 (GC-MS) 分析SVOCs.

主要成果:

该方法证明了63种SVOC的良好的线性 (R2>0.99),其度范围为100-5000μg L-1.1.
方法检测极限 (MDLs) 低于0.050毫克/公斤-1,恢复率一般高于70%.
与EPA 3545 ASE方法相比,QuEChERS方法将有机溶剂的使用量减少了14倍,并显著缩短了操作时间,对于大多数化合物来说,其提取结果优越.

结论:

优化的QuEChERS方法与GC-MS相结合,是一种快速,简单,准确和高效的技术,用于在土壤中高通量确定63种SVOC.
这种方法需要最小的样本量,并大大减少环境污染,与绿色分析化学原则保持一致.
开发的方法为快速选受污染的土壤样本中的SVOC提供了实用和优质的替代方案.

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