辽河口湿地土壤多环芳烃的分布与生态风险评价

DISTRIBUTION AND ECOLOGICAL RISK ASSESSMENT OF PAHS IN SOILS FROM LIAOHE ESTUARINE WETLAND

2008年10月,2009年5月和8月分别对辽河口湿地土壤进行分层取样,利用GC-FID技术定量分析PAH含量.结果表明,不同站位表层土壤中PAHs总量变化范围为268.7—2853.8 n.gg-1,平均值为1241.9ng.g-1.2008年10月份土壤PAHs以高环为主,2009年5月和8月均是以低环为主.PAHs含量与pH和盐度相关性很低,理论上可视为无相关性,与有机质的相关性在不同土壤深度差异较大,与油类含量之间的相关性在不同时间变化较大.生态风险评价显示,2008年10月滩涂区域的L3站位、普通苇田区的L4、L5、L6站位和2009年5月滩涂区域的L2、L3站位存在对生物的潜在危害,其余站位生态风险均处于较低水平,2009年8月所有站位的生态风险均处于较低水平.

amples were collected in soil profiles of Liaohe estuarine wetland in October 2008 and May and August 2009.Polycyclic aromatic hydrocarbons（PAHs） were quantified with GC-FID.The results showed that the total concentrations of PAHs in surface soils ranged from 268.7 to 2853.8 ng·g^-1 with a mean of 1241.9 ng·g^-1.The proportion of the low molecular weight components was dominant in May and August 2009,while the components with high molecular weight were dominant in October 2008.There was no correlation between PAHs concentration and physical-chemical parameters such as pH and salinity.Correlation between PAHs concentration and organic matter was different at different depth of soil,and the correlation between PAHs concentration and oil content varyed significantly in different time.The sampling stations from intertidal zone（L3 station in October 2008 and L2,L3 stations in May 2009） and simple reed yields（L4,L5 and L6 stations in October 2008） may occasionally pose adverse biological effects,and low ecological risk were found in other sampling stations.