• 关键词：挥发性有机硫化物  致嗅  富营养化  污染现状  来源

• 基金项目：国家水体污染控制与治理科技重大专项课题(No.2012ZX07202-005);中央级公益性科研院所基本科研业务专项(No.2011YSKY-11)

• 刘洋
• 1. 中国环境科学研究院环境基准与风险评估国家重点实验室, 北京 100012;
  2. 中国环境科学研究院城市水环境科技创新基地, 北京 100012;
  3. 北京科技大学化学与生物工程学院, 北京 100083

• 韩璐
• 1. 中国环境科学研究院环境基准与风险评估国家重点实验室, 北京 100012;
  2. 中国环境科学研究院城市水环境科技创新基地, 北京 100012

• 宋永会
• 1. 中国环境科学研究院环境基准与风险评估国家重点实验室, 北京 100012;
  2. 中国环境科学研究院城市水环境科技创新基地, 北京 100012

• 弓爱君
• 北京科技大学化学与生物工程学院, 北京 100083

• 摘要：为研究白塔堡河中致嗅类挥发性有机硫化物(VOSC)的污染现状及来源,采用吹扫捕集(P&T)与气相色谱(GC)/火焰光度检测器(FPD)联用的分析方法同时测定水体中14种致嗅类VOSC的浓度,并依据综合营养状态指数(TLI)对白塔堡河的富营养化程度进行评价,用主成分分析法(PCA)分析其污染来源.结果表明,所调查的31个点位中,各目标化合物均有不同程度的检出,浓度范围为0~35.98 μg·L^-1;甲硫醚(DMS)为最主要的污染物,其均值为3.36 μg·L^-1,检出率为100%,变异系数为2.30.河流整体处于中度富营养化水平,其中,城市段水体重度富营养化,农村段和城镇段VOSC浓度与TLI显著相关(r>0.70).14种致嗅类VOSC的污染来源可由3个主成分来反映:第一主成分(硫醇类、DMS、甲乙硫醚(EMS))代表由微生物厌氧分解造成的二次污染,其贡献率为44.42%,这是水体富营养化和生活污水、含蛋白质的工业废水及养殖废水排放共同作用的结果;第二主成分(乙硫醚(DES)、二乙基二硫醚(DEDS)、甲丙二硫醚(MPDS)、1-丙基二硫醚(1-PrDS))代表农业面源,贡献率为30.77%;第三主成分(二甲基三硫醚(DMTS))代表工业源,贡献率为7.83%.

• Abstract：In order to study the pollution status of odorous volatile organic sulfide compounds (VOSC) in the Baitapu River, a method for simultaneous determination of 14 VOSC in water sample was developed using purge and trap (P&T) coupled with gas chromatography (GC)-flame photometric detector (FPD). The eutrophication degree of the Baitapu River was evaluated by the comprehensive trophic level index (TLI). The pollution sources of VOSC were analyzed by the principal component analysis (PCA). The results indicated that each target compound could be identified in the samples from 31 investigated points, with concentration ranging from 0 to 35.98 μg·L^-1. Dimethyl sulfide (DMS) was the most important contaminant, with the average concentration was 3.36 μg·L^-1, detection rate of 100% and variation coefficient of 2.30. The eutrophication degree of the whole river was at moderate level, while in the urban area at heavy level. The concentration of VOSC was significantly related with TLI in rural and town areas (r>0.70). The pollution sources of 14 VOSC could be reflected by three principal factors: the first one (the thiols, DMS, ethyl methyl sulfide (EMS)) with contribution rate of 44.42% represented secondary pollution caused by microbial anaerobic decomposition as a combined result of eutrophication, emissions of domestic wastewater, industrial effluents containing protein and aquaculture wastewater;the second one (diethyl sulfide (DES), diethyl disulfide (DEDS), methyl propyl disulfide (MPDS), 1-propyl disulfide (1-PrDS)) represented agricultural nonpoint source pollution, contributing 30.77%;the third one (dimethyl trisulfide (DMTS)) represented industrial emissions, contributing 7.83%.

• Key words：volatile organic sulfur compounds  odor  eutrophication  pollution situation  sources

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