阿拉尔枣园土壤重金属含量测定及污染评价宁承江1李静1雷永斌2吴瑛2,3(1.阿克苏地区环境保护局,新疆阿克苏833000;2.新疆生产建设兵团塔里木盆地生物资源保护与利用重点实验室,新疆阿拉尔843300;3.塔里木大学生命科学学院,新疆阿拉尔843300)摘要:为调查阿拉尔枣园土壤重金属污染状况,以新疆阿拉尔团场的红枣园间土壤为研究对象,对24个红枣枣园的土壤进行采集。采用火焰原子吸收分光光度法测定了枣园土壤样品中的Cd,Pb,Cr,Cu和Zn5种重金属含量,以《土壤环境质量标准》(GB15618-1995)二级为标准,运用尼梅罗综合污染指数法进行评价。结果表明,24个土壤样点中的Cu,Pb,Cr,Zn和Cd平均含量分别为30.54,85.99,71.09,77.29,4.62mg/kg,均大于新疆土壤背景值,Cu,Cr,Pb和Zn2+污染等级均为无污染、安全无风险,符合国家二级土壤标准。但是存在Cd污染,分别有54.17%,8.33%,37.5%的采样点处于轻度、中度和重度污染,需要进行特别的关注。土壤重金属综合污染指数P平均值为3.36,属于中度污染状态,Cd是最主要污染指数贡献因子。关键词:重金属;土壤;评价;枣园;阿拉尔Abstract:InordertoinvestigatethesoilheavymetalpollutionintheAlarjujubefield,thesoilsampleswerecol-lectedfromthe24jujubegardensinAlar,Xinjiang.Byusingflameatomicabsorptionspectrophotometry,5kindsofheavymetals,Cd,Pb,Cr,CuandZncontentofthesoilsamplesweredeterminedaccordingtosecondarystandardofthesoilenvironmentqualitystandard(GBl5618-1995),andwereevaluatedwiththeNemerowSyn-theticalPollutionIndexmethod.TheresultsshowthatCu,Pb,Cr,CuandZincaveragecontentofthe24soilsampleare:30.54mg/kg,85.99mg/kg,71.09mg/kg,77.29mg/kgand4.62mg/kgrespectively,allofwhichweregreaterthanthesoilbackgroundvaluesinXinjiang.Cu,Cr,PbandZn2+pollutionlevelsarepollution-free,safeandrisk-free,conformstothenationalsecondarystandardofsoil.However,thereisCdpollution,with45.83percent,8.33percentand45.83percentofthesamplepointsinlight,moderateandseverepollution,whichre-quiresspecialattention.Thepotentialcomprehensivepollutionindexofsoilheavymetalsis3.36,whichismoder-atelypolluted.Cdisthemostimportantfactorcontributingtopollutionindex.Keywords...