固相萃取-气相色谱法测定水和废水中四种氯苯类有机污染物

研究了用固相萃取技术结合氢火焰气相色谱法测定水和废水中四种氯苯类有机污染物。通过实验比较Sdex C18,Sep-Park Vac Silica,Bond Elut CARBON,Bond Elut SI和Bond Elut PLEXA五种SPE小柱对四种氯苯类的萃取效率,发现Dionex的Sdex C18柱有很好的回收率。系统研究了最佳萃取条件,甲醇洗脱体积为4.0 mL,且洗脱液不可通过氮吹浓缩;四种氯苯类化合物除氯苯外穿透体积都在1.0 L以上,而氯苯的穿透体积为300 mL,表明Sdex C18柱对二氯苯和三氯苯有很强的吸附性。在最佳萃取和测定条件下,方法线性范围为20.0~400μg/L,检出限为0.383~0.635μg/L,完全满足日常环境监测分析要求。

Determination of four chlorobenzene compounds in water and wastewater by SPE-GC

A method for determination of four chlorobenzene compounds in water and wastewater by solid phase extraction with FID-GC detection was investigated.The extraction efficiency of four chlorobenzene compounds on Sdex C18 column,Sep-Park Vac Silica column,Bond Elut CARBON column,Bond Elut SI column and Bond Elut PLEXA column was compared,and the Sdex C18 column had the best recovery.The method for solid phase extraction was further systemically studied.Methanol of 4.0 mL is used as eluting solvent,and the adsorption eluent can not be concentrated by nitrogen blowing;the breakthrough volume of most compounds is above 1.0 L,but that of chlorobenzene is 300 mL.It shows that the Sdex C18 column has a strong adsorption of dichlorobenzene and trichlorobenzene.Under the optimized conditions,the linear rang was 20.0-400μg/L,and the detection limit was 0.383-0.635μg/L.It fully meets the requirements of daily environmental monitoring and analysis.