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1、第24卷第4期生态学报Vo.l24,No.42004年4月ACTAECOLOGICASINICAApr.,2004土壤砷污染对蔬菜砷含量及食用安全性的影响1,22*22221蔡保松,陈同斌,廖晓勇,谢华,肖细元,雷梅,张国平(1.浙江大学农业与生物技术学院,杭州310029;2中国科学院地理与资源研究所环境修复室,北京100101)摘要:对湖南郴州砷污染区的土壤和蔬菜砷含量进行了研究,结果表明该地区土壤含砷量为19.5～237.2mg/kg、平均为63.9mg/kg、中值为47.8mg/kg,比全国平均土壤含砷量(9.2mg/kg)高2～25倍;蔬
2、菜可食部分砷含量范围为0.04～2.64mg/kg、平均为0.74mg/kg、中值为0.54mg/kg,54%的蔬菜可食部分含砷量超过了《蔬菜卫生标准》规定的最大允许量(MPC≥0.5mg/kg);菠菜,茼蒿和生菜可食部分超标比较严重,最大砷含量超出MPC5倍左右。关键词:砷;蔬菜;污染;安全;土壤ArsenicconcentrationsinsoilsandvegetablesandtheirriskassessmentsinhighlycontaminatedareainHu'nanProvince1,222222CAIBao-Song,CHE
3、NTong-Bin,LIAOXiao-Yong,XIEHua,XIAOXi-Yuan,LEIMei,ZHANG1Guo-Ping(1CollegeofAgricultureandBiotechology,ZhejiangUniversity,Hangzhou,310029;2LaboratoryofEnvironmentalRemediation,InstituteofGeographicSciencesandNaturalResourcesResearch,ChineseAcademyofSciences,Beijing100101).ActaE
4、cologicaSinica,2004,24(4):711～717.Abstract:Contaminationofsoilsbyarsenic(As)resultsfrommining,smeltingofsulfideores,pesticides,timberpreservationandAs-richgroundwaters.Arseniccontaminatedsoils,sedimentsandsludgesaremajorsourcesofcontaminationinthefoodchainsandwatersupplies.The
5、uptakeofarsenic(As)byvegetablesfromcontaminatedsoilspresentsahealthhazardthatmayaffecttheuseofagriculturalland.ContaminationoffoodsbyAsremainsapossibledangerunderlongtimeconsumer.WithintheHunanProvince,GuiyangandShimencountycontainthelargestnumbersofpeoplelivinginproximitytosu
6、lfideores,containingAs.Becauseoftheseorebodiesandminingactivityforover1500years,highAsconcentrationsinsoilarenotexceptional.SoilAsconcentrations>200mg/kgoccuron54kmoftheregion.TheeffectsonAsbioavailabilitywereassessedusingarangeofvegetablesgrowninthefield.Fourlocationswereused
7、,wheresoilwascontaminatedbyAsfromdifferentsources.Sweetpotato,lettuce,potato,radishandspinachetal.weregrownatthemostcontaminatedsitewithameanof64mg/kgintheclayloam.ArsenicconcentrationsinsoilsandvegetablescollectedfromChenZhouCity,HunanProvince,wereinvestigatedinthispaper.Ther
8、esultsshowedthatAsconcentrationsinthesoilswere19.5～327.2mg/kg
