Departamento de Química Analítica, Nutrición y Bromatología, Facultad de Ciencias Químicas, Universidad de Salamanca, 37008 Salamanca, Spain.
Talanta. 2010 Apr 15;81(1-2):385-91. doi: 10.1016/j.talanta.2009.12.013. Epub 2009 Dec 16.
A simplified version of the QuEChERS method for the extraction of chlorinated pollutant compounds from soil samples is proposed. The procedure involves simple liquid extraction of the soil sample with ethyl acetate, followed by the addition of anhydrous MgSO(4). Gas chromatography/electron capture detection (ECD) is then used to analyse the extracts without any other sample pretreatment. This new QuEChERS version includes, therefore, fewer treatment stages of the sample, which makes the final procedure simpler, faster, and cheaper and minimizes the creation of errors associated with this step. Three chlorinated compounds (chloroform, 1,2-dichlorobenzene, and hexachlorobenzene) of different volatility and polarity have been selected as target compounds and two different solvents (acetonitrile and ethyl acetate) have been evaluated in order to prove the suitability of the proposed approach for the extraction of these compounds from different soil samples. The suitability of the acetonitrile and ethyl acetate for PTV-GC analysis has also been evaluated. Recoveries between 62 and 93% and reproducibilities between 3.5 and 7.6% have been achieved.
提出了一种从土壤样品中提取氯化污染物化合物的 QuEChERS 方法的简化版本。该方法包括用乙酸乙酯简单地萃取土壤样品，然后加入无水硫酸镁。然后使用气相色谱/电子俘获检测（ECD）对提取物进行分析，而无需进行任何其他样品预处理。因此，这种新的 QuEChERS 版本包括更少的样品处理阶段，使最终程序更简单、更快、更便宜，并最大限度地减少了与该步骤相关的错误的产生。选择了三种不同挥发性和极性的氯化化合物（氯仿、1,2-二氯苯和六氯苯）作为目标化合物，并评估了两种不同的溶剂（乙腈和乙酸乙酯），以证明该方法适用于从不同土壤样品中提取这些化合物。还评估了乙腈和乙酸乙酯用于 PTV-GC 分析的适用性。回收率在 62%至 93%之间，重现性在 3.5%至 7.6%之间。
