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1、.word格式.通遼污灌區(qū)土壤與作物中重金屬富集狀況及風險評價王靜張士超魯垠濤姚宏*(北京交通大學土木與建筑工程學院,北京10444)摘要:污水灌溉不僅能緩解現(xiàn)在人類面臨的水資源短缺問題,而且用于灌溉的污水也為農(nóng)作物提供了豐富的營養(yǎng)物質,但長期污灌勢必會引起污灌區(qū)土壤重金屬等污染物積累,而土壤中重金屬是否會通過食物鏈等途徑進入人體引起了人們廣泛關注。文中選取通遼市孔家鄉(xiāng)、二道河及木里圖等三大污灌區(qū),共采集16份表層土壤、48份剖面土壤以及15份玉米植株進行重金屬含量測定及健康風險評價,結果發(fā)現(xiàn):擁有不同
2、灌溉水源的灌區(qū)內(nèi)重金屬含量存在明顯差異,其中表層土壤中As元素嚴重超過土壤環(huán)境質量標準,而玉米中Pb元素超過糧食食品安全標準,其它金屬元素皆低于相關標準。通過健康風險評價得知三大灌區(qū)中二道河灌區(qū)內(nèi)作物健康風險最低,另外,各個灌區(qū)的HRI值皆小于1,說明該通遼所有灌區(qū)內(nèi)生長的農(nóng)作物并不存在健康風險,然而轉移系數(shù)(TF)值較大的Cu與Cd與HRI值較大的Cu與Pb依然需要人們關注。關鍵詞:重金屬;健康風險;污水灌溉;土壤Healthriskassessmentofheavymetalsinsoilsandc
3、ropsfromsewageirrigatedarea,TongliaoofInnerMongolia,ChinaWangJing,ShichaoZhang,YintaoLu,HongYao*(DepartmentofMunicipalandEnvironmentalEngineering,BeijingJiaotongUniversity,Beijing10444,China)Abstract:Wastewaterirrigationcansolvetheproblemabouttheshortage
4、ofwater,itcanalsoprovidevaluablenutrientstothecropsgrownonthefarmland,however,withthelong-termapplicationofwastewatertothesoil,thereisapotentialaccumulationofheavymetalsandotherpollutants.Becausethefoodchainisoneoftheimportantpathwaysfortheentryoftheheav
5、ymetalsintothehumanbody,heavymetalsinsoilsandplantsisofincreasingconcern.16topsoil,48subsoiland15cornfromKongJiaxiang,ErDaoheandMuLituinTongLiaoisevaluated.Westudiedthehealthrisksofheavymetalsincontaminatedfoodcropsirrigatedwithwastewater.Resultsindicate
6、thatthereisobviousdiffersinthewastewater-irrigatedsoilsfromdifferentirrigatingresources,theconcentrationofAsinthetopsoilandPbinthecornexceedthepermissiblelimitssetbyEnvironmentalProtectionAdministrationinChina,othermetalconcentrationinsoilsandcorpsweresi
7、gnificantlylowerthanthelimits.Furthermore,thestudyhighlightsthatcropsgrownonErDaoheDistrictwassafestforman.Healthriskindexvaluesoflessthan1indicatearelativeabsenceofhealthrisksassociatedwiththeingestionofcontaminatedfoodcrops,however,CuandCdwithhigherTFa
8、ndCuandPbwithhigherHRIstillneedmoreattention.Keywords:HeavyMetals;Healthrisk;Sewageirrigation;Soil隨著經(jīng)濟快速發(fā)展以及全球化的加速,人們對水量的需求越來越大,而對水量的需求成為了中國北部與西北部等干旱及半干旱地區(qū)限制農(nóng)業(yè)可持續(xù)發(fā)展的一個主要因素[1]。城市或工廠向環(huán)境排放的生活污水及工業(yè)廢水中含有的碳水化合物、脂肪、蛋白質等物質被微生物分解后可