摘要
为查明苏南太湖平原区浅层地下水水质状况,在苏南北部（C区）、东北部（W区）和东部（S区）3个地区共采集56组地下水样,利用气相色谱仪分析样品中16种优先控制的多环芳烃组分浓度,并运用谱系聚类分析法和分子比例法探寻多环芳烃来源.结果表明,检出的多环芳烃中以3~4苯环组分为主,总多环芳烃浓度最高达32.45μg/L,均值为4.42μg/L.多环芳烃分布具有区域分布特征,高值点多出现在工业区附近.分子比值法表明,研究区浅层地下水中多环芳烃来源是化石燃料和石油源叠加的结果.谱系聚类分析法结果表明,C区各采样井的苯并（k）荧蒽异常浓度控制该区的聚类结果;W区各采样井的苯并（a）蒽异常浓度控制着该区聚类结果;S区各采样井的苯并（b）荧蒽异常浓度控制该区的聚类结果.在0.05水平上,C区的荧蒽、苊、亚二氢苊、菲、苯并（a）芘间的Pearson相关系数达到0.680-0.712;W区的苯并（g,h,i）芘、苯并（a）蒽和苯并（a）芘间的Pearson相关系数到达0.724-0.773;S区的亚二氢苊和芴的Pearson相关系数为0.659.可以推测出各区所列的这几种多环芳烃组分很可能分别来自于各区内同一类型污染源.
To investigate shallow groundwater quality in Taihu plain, south of Jiangsu province, 56 samples were collected in north area （C area）, north east area （W area） and east area （S area）. The concentrations of priority 16 polycyclic aromatic hydrocarbons （PAHs） were analyzed by HP 6890-GC. Hierarchical cluster analysis （HCA） and Molecular ratios were used to characterize their possible pollution sources. Concentrations of total priority 16 PAHs in shallow groundwater samples ranged from below method detection limits（ 〈 MDLs） to 32.45 μg/L with the average value of 4.42μg/L, which were predominated by three and four-ring PAHs. High contents of PAHs were found in the vicinity of industrial areas. Ratios of specific PAH compounds including phenanthrene/anthracene （Phe/Ant）, fluoranthene/pyrene（FL/Pyr）, chrysene/ benzo（a）/anthracene （Chr/BaA）, low-molecular-weight PAH/high-molecular-weight PAH （LPAH/HPAH） were calculated to evaluate the possible sources of PAH contamination. These ratios reflected a mixed pattern of pyrolytic and petrogenic inputs of PAHs with different proportion in shallow groundwater. Hierarchical cluster analysis （HCA） results showed that the abnormal benzo（k） fluoranthene concentration dominated the HCA results in C area, the abnormal benzo（a）anthracene concentration dominated the HCA results in W area, and the abnormal benzo（b）fluoranthene concertration dominated the HCA results in S area. At level 0.05, FL, AcPy, Acp, Phe and Bap in C area had Pearson correlation between 0.680 and 0.712. BP, BaA and Bap in W area had Pearson correlation between 0.724 and 0.773. AcPy and Flu in S area had Pearson correlation 0.659, which meant that these PAHs listed in each areas might came from the same kind of sources.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2008年第7期1806-1810,共5页
Environmental Science
基金
国土资源部项目(200310400046)
