Simultaneous Determination of Nitrobenzene Compounds and Organochlorine Pesticides in Water by Gas Chromatography
A method for the simultaneous determination of 10 nitrobenzenes and 8 organochlorine pesticides in water by liquid-liquid extraction and gas chromatography was established.The effects of different extraction solvents,extraction volume and extraction time on the recovery rate were compared.Finally,10.0 mL toluene was determined as the extraction solvent,and the volume was fixed to 20.0 mL after 5 minutes of extraction.The purification method is determined to use silica gel column for purification,and the recovery rate is above 80%.The detection limit of the target compound is 0.035~0.45 µg/L,and the lower limit of determination is 0.14~1.78 μg/L.The spiked water samples of low,medium and high concentrations were determined respectively,and the determination was repeated for 6 times.The relative standard deviation range was 1.7%~10.6%,and the spiked recovery range was 80.6%~110%,which could meet the laboratory quality control requirements.The method is simple,fast,time-consuming,and has ideal precision and detection risk.It can simultaneously determine 10 nitrobenzenes and 8 organochlorine pesticides in water.