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1、第33卷第1期Vol.33No.1第12010期年1月EnvironmentalScience&TechnologyJan.2010東莞市農(nóng)業(yè)土壤和蔬菜砷含量及其健康風(fēng)險(xiǎn)分析1,2,3221,33331蔡立梅,黃蘭椿,周永章,許振成,彭曉春,姚玲愛,周揚(yáng),彭平安(1.中國科學(xué)院廣州地球化學(xué)研究所有機(jī)地球化學(xué)國家重點(diǎn)實(shí)驗(yàn)室,廣東廣州510640;2.中山大學(xué)地球環(huán)境與地球資源研究中心,廣東廣州510275;3.環(huán)境保護(hù)部華南環(huán)境科學(xué)研究所,廣東廣州510655)摘要:研究系統(tǒng)采集了東莞市118個(gè)農(nóng)業(yè)土壤樣品和43個(gè)蔬菜樣品進(jìn)行砷含量分析,研究了土壤和蔬菜砷含量及其健康風(fēng)險(xiǎn)。研究發(fā)
2、現(xiàn),東莞市農(nóng)業(yè)土壤砷含量變化范圍0.40~28.87mg/kg,平均值12.95mg/kg,遠(yuǎn)高于東莞市背景值,其中62%的樣品砷含量超過國家一級(jí)標(biāo)準(zhǔn)限定值,砷含量的變異系數(shù)為53.28%,變異程度較大。東莞市各區(qū)域土壤砷空間分布不均勻,土壤砷含量平均值大小排序如下:西部平原區(qū)>環(huán)境保護(hù)區(qū)>中部過渡區(qū)>東南丘陵區(qū)。土壤砷主要來源于成土母質(zhì),化石燃料燃燒、農(nóng)藥、化肥(磷肥)等工農(nóng)業(yè)活動(dòng)的輸入也不容忽視。東莞市蔬菜砷含量超標(biāo)比較嚴(yán)重,蔬菜砷對(duì)東莞市部分人群存在一定的健康風(fēng)險(xiǎn)。關(guān)鍵詞:農(nóng)業(yè)土壤;蔬菜;重金屬污染;砷;健康風(fēng)險(xiǎn);東莞市中圖分類號(hào):X82文獻(xiàn)標(biāo)志碼:Adoi:10.396
3、9/j.issn.1003-6504.2010.01.048文章編號(hào):1003-6504(2010)01-0197-04ArsenicConcentrationsinVegetablesandSoilsinDongguanandPotentialRisktoHumanHealth1,2,3221,3CAILi-mei,HUANGLan-chun,ZHOUYong-zhang,XUZhen-cheng,XU3331PENGXiao-chun,YAOLing-ai,ZHOUYang,PENGPing-an(1.StateKeyLaboratoryofOrganicGeochemis
4、try,GuangzhouInstituteofGeochemistry,ChineseAcademyofSciences,Guangzhou510640,China;2.CenterforEarthEnvironmentandResource;SunYat-senUniversity,Guangzhou510275,China;3.SouthChinaInstituteofEnvironmentalSciences,MinistryofEnvironmentalProtection,Guangzhou510655,China)Abstract:Pollutioncausedb
5、yover-contentofarsenicinsoilsandvegetablesproducedinDongguanCity,GuangdongProvincewasanalyzed.Inordertomakeassessmentmoreobjectiveandassurable,118agriculturalsoiland43vegetablesampleswerecollected.Resultsshowedthatarsenicconcentrationsinsoilrangedfrom0.40mg/kgto28.87mg/kg,witharithmeticmeano
6、f12.95mg/kg,farhigherthanthebackgroundarsenicconcentrationofsoil.62%ofsoilsamplesexceededthecontentofheavymetalinEnvironmentalQualityStandardforSoilsofGB15618-1995.Thespatialdistributionshowedthatarseniccontentsofagriculturalsoilsaregreatlydifferentindifferentareas,withtheorderaswesternplain
7、area,protectedarea,centraltransitionareaandsoutheasternhillyarea.Themainsourceofarsenicisfromsoilparentmaterials,withsourcesalsoincludingcombustionoffossilfuels,lead-containedpesticideandfertilizer.Arsenicconcentrationsinvegetablesamplesalsoreveale