填埋场周边土壤邻苯二甲酸酯研究

Research on Phthalic Acid Esters in Soil around Municipal Solid Waste Landfill

采用超声萃取-气质联用方法对广州某典型垃圾填埋场周边土壤中邻苯二甲酸酯含量进行检测分析。结果表明,采样点邻苯二甲酸酯污染严重,除DOP无超标外,其余四种化合物均有不同程度的超标,DBP、DEP、DEHP和DMP超标率分别达到100%、90%、80%和30%。表层与剖面土壤样品PAEs分布范围分别为44.25～261.63 mg/kg和4.83~126.21mg/kg,平均值分别为148.76 mg/kg和66.02mg/kg,剖面土壤中含量低于相应表层土壤中PAEs的含量,生活垃圾对周围土壤的邻苯二甲酸酯类化合物污染有着重要的贡献。

Five U.S.EPA priority pollutants of phthalic acid esters(PAEs) including di-methyl phthalate(DMP),di-ethyl phthalate(DEP),di-n-buty1 phthalate(DBP),di-(2-ethylhexyl) phthalate(DEHP) and di-n-octyl phthalate(DOP) in ten soil samples from the area around a typical municipal solid waste landfill in Guangzhou city had been determined by gas chromatography-mass spectrometry(GC-MS).It had been demonstrated that the ten soil sample were heavily polluted by PAEs,corresponding to the rate of exceeding soil allowable concentration for DBP,DEP,DEHP and DMP being 100%、90%、80% and 30% separately,except DOP.Total contents of the five PAE compounds(∑PAEs) in all surface soils ranged from 44.25 mg/kg to 261.63 mg/kg,together with total contents of the five PAE compounds(∑PAEs) in all sectional soils ranging from 4.83 mg/kg to 126.21mg/kg,corresponding to their mean values being 148.76 mg/kg and 66.02 mg/kg separately.It had been found that total contents of ∑PAEs in surface soils were less than their corresponding contents in sectional soils.It had been concluded that household garbage had an important contribution on the surrounding soil contamination of phthalate esters.