二硫化碳萃取—气相色谱法同时测定含盐酸废水中的甲苯、邻氯甲苯、对氯甲苯和氯化苄

Simultaneous Determination of Toluene, o-Chlorotoluene, p-Chlorotoluene and Benzyl Chloride in Hydrochloric Acid Containing Wastewater by Carbon Disulfide Extraction-Gas Chromatography

建立了二硫化碳萃取—气相色谱法同时测定含盐酸废水中甲苯、邻氯甲苯、对氯甲苯和氯化苄的方法,并应用于实际水样的测定.采用二硫化碳萃取含盐酸废水中的甲苯、邻氯甲苯、对氯甲苯、氯化苄,待测物质经30QC3/AC20 （30 m×0.32mm× 0.50 μm）毛细管柱气相分离.采用保留时间定性,外标法定量.实验结果表明,甲苯、邻氯甲苯、对氯甲苯和氯化苄的质量浓度在0.2-100.0 mg/L范围内与对应的峰面积呈良好的线性关系,检出限分别为0.09,0.12,0.13,0.10mg/L.该方法的精密度和准确度较高,相对标准偏差小于2％,加标回收率在96.4％- 101.0％之间.

A method for simultaneous determination of toluene, o-chlorotoluene, p-chlorotoluene, benzyl chloride in hydrochloric acid containing wastewater was established by carbon disulfide extraction-gas chromatography, and was used to detect the actual sample. Toluene, o-chlorotoluene, p-chlorotoluene, benzyl chloride in the hydrochloric acid containing wastewater were extracted with carbon disulfide and then separated in gaseous phase through a 30QC3/AC20 （30 m × 0.32 mm × 0.50 μm） capillary column. The qualitative analysis was based on retention time method, the quantitative analysis was on external standard method. The experimental results show that the mass concentrations of toluene, o-chlorotoluene, p-chlorotoluene, benzyl chloride have a good linear relationship with the peak areas in the range of 0.2- 100.0 mg/L, their detection limits are 0.09, 0.12, 0.13, 0.10 mg/L respectively. The precision and accuracy of the method are high, the relative standard deviation is less than 2%, and the recovery of standard addition is 96.4%- 101.0%.