WANGJuan,YUZhi-yong,HANSi-qi,et al.Static Headspace Gas Chromatography for Determination of Seven Volatile Halohydrocarbon in Sewage[J].China Water & Wastewater,2023,39(16):140-146.
静态顶空-气相色谱法测定污水中7种挥发性卤代烃
- Title:
- Static Headspace Gas Chromatography for Determination of Seven Volatile Halohydrocarbon in Sewage
- Keywords:
- sewage; headspace; gas chromatography; volatile halohydrocarbon
- 摘要:
- 建立了适于测定污水中7种挥发性卤代烃的静态顶空-气相色谱法，分别考察了顶空平衡温度、顶空平衡时间、盐度和过滤水样滤膜种类对检测结果的影响。结果表明：当选用顶空平衡时间为40 min、顶空平衡温度为70 ℃、加盐量为0%、聚四氟乙烯滤膜过滤时，7种目标物的线性相关系数均不小于0.999，加标回收率在95.2%~106%之间，测定结果的相对标准偏差在0.40%~3.5%之间，定量限为0.048~0.360 μg/L。该方法操作简便，适用于污水中7种挥发性卤代烃的测定。对北京某污水处理厂各工艺段污水样品进行了测定，加氯消毒后的出水中三氯甲烷和二氯一溴甲烷浓度分别为0.014 2 mg/L和0.000 3 mg/L，均低于《城镇污水处理厂污染物排放标准》（GB 18918—2002）中的限值。
- Abstract:
- A static headspace gas chromatography method was established for the determination of seven volatile halohydrocarbons in sewage. The effects of headspace equilibrium temperature, headspace equilibrium time, salinity and the type of filter membranes on the detection results were investigated. When the headspace equilibrium time was 40 min, the headspace equilibrium temperature was 70 ℃, the dosage of salt was 0% and the filter membrane was polytetrafluoroethylene, the linear correlation coefficients of the seven target pollutants were all not less than 0.999, the spiked recoveries were between 95.2% and 106%, the relative standard deviations were from 0.40% to 3.5%, and the limits of quantification were between 0.048 μg/L and 0.360 μg/L. The method is simple and suitable for the determination of seven volatile halohydrocarbons in sewage. The wastewater samples from each process section of a wastewater treatment plant in Beijing were determined. The concentrations of trichloromethane and bromo dichloromethane in the effluent after chlorination were 0.014 2 mg/L and 0.000 3 mg/L, respectively, which were lower than the limits specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002).
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