Method for determining polychlorinated biphenyl compounds in water

The invention discloses a method for determining polychlorinated biphenyl compounds in water. The method comprises the following steps: S1, extracting a sample; S2, analyzing the sample; and S3, result calculation and representation. The method has the technical effects and advantages that (1) sample extraction is stable, the parallelism is high, and the precision is high; (2) the liquid-liquid extraction operation is simple, can be realized in most laboratories, and can be used for large-batch detection work; (3) the detection limit is low, the variety of polychlorinated biphenyls is multiple, and the evaluation requirements of 'underground water quality standard' (GB14848-2017) can be met; and (4) the standard addition of the sample and the recovery rate of substitutes can be 70-130%. 本发明公开了一种测定水中多氯联苯类化合物的方法，包括以下步骤：S1、试样提取；S2、分析样品；S3、结果计算与表示。本发明的技术效果和优点：(1)样品提取稳定，平行性好，精密度高。(2)液液萃取操作简单，大多实验室都可以实现，可用于大批量检测工作。(3)检出限低，多氯联苯种类多，可以满足《地下水质量标准》(GB14848-2017)的评价要求。(4)样品加标和替代物回收率均能在70％-130％之间。