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1、2016,35(5):901-906农业环境科学学报2016年5月JournalofAgro-EnvironmentScience钟来元,钟燕彬,杨杰文.六价铬在砖红壤中淋溶特征的模拟研究[J].农业环境科学学报,2016,35(5):901-906.ZHONGLai-yuan,ZHONGYan-bin,YANGJie-wenl.CharacteristicsofCr(Ⅵ)leachinginoxisolundersimulatedcolumnexperiment[J].JournalofAgro-Environme
2、ntScience,2016,35(5):901-906.六价铬在砖红壤中淋溶特征的模拟研究*钟来元,钟燕彬,杨杰文(广东海洋大学农学院资源与环境系,广东湛江524088)摘要:通过室内土柱淋溶实验,研究了六价铬在砖红壤中淋溶特征以及有机肥和陪伴离子[Cu(Ⅱ)、磷酸根]对该过程的影响,并探讨了模拟酸雨条件下,土壤中六价铬溶出特征。结果表明:高氧化铁含量砖红壤对Cr(Ⅵ)有很强吸附能力,当Cr(Ⅵ)输入量小于240mg·kg-1水平,其在淋溶液中浓度低于二苯碳酰二肼比色法检测限。土壤添加有机肥后,初始阶段淋溶液Cr(
3、Ⅵ)浓度较对照处理高,但经历一段时间后,则较对照处理小,这表明有机肥一定程度上可减少Cr(Ⅵ)淋溶量。Cu(Ⅱ)能提高土壤表面ζ-电位和促进Cr(Ⅵ)吸附,并降低砖红壤Cr(Ⅵ)淋溶量;磷酸根可减小土壤表面ζ-电位和土壤对Cr(Ⅵ)吸附量,从而促进Cr(Ⅵ)淋溶。模拟酸雨条件下,土壤中Cr(Ⅵ)淋溶量呈现出先逐渐增加后减少特征。当Cu(Ⅱ)存在时,尽管土壤中Cr(Ⅵ)保持量最大,但其在淋溶液中浓度却较对照低,说明Cu(Ⅱ)与Cr(Ⅵ)之间的相互作用有助于降低后者淋溶量。关键词:六价铬;砖红壤;淋溶-迁移中图分类号:X
4、53文献标志码:A文章编号:1672-2043(2016)05-0901-06doi:10.11654/jaes.2016.05.012CharacteristicsofCr(Ⅵ)leachinginoxisolundersimulatedcolumnexperimentZHONGLai-yuan,ZHONGYan-bin,YANGJie-wen*(DepartmentofResourcesandEnvironmentalSciences,CollegeofAgriculture,GuangdongOceanUniv
5、ersity,Zhanjiang524088,China)Abstract:UnderstandingCr(Ⅵ)leachingisimportantforassessmentsofgroundwaterandhealthriskofsoilCr.Asimulatedsoilcolumnex-perimentwasconductedtoexaminetheeffectsoforganicfertilizerandcoexistingionsonthereleaseofsoilCr(Ⅵ)undersimulatedac
6、idraincondition,usinganoxisol.AtCr(Ⅵ)inputslessthan240mg·kg-1,concentrationsofCr(Ⅵ)inleachatewerebelowthedetectionlimitofdiphenylcarbazidecolorimetricspectrophotometicmethodusedinthisstudy,whichwasattributedtothelargeadsorptioncapacityofFe-richsoilforCr(Ⅵ).Inam
7、endmentoforganicfertilizer,leachingofCr(Ⅵ)wasenhancedattheearlystage,butreducedatthelaterstage,incomparisonwiththecontrol,partiallyascribedtothereductionofCr(Ⅵ)tolessmobileCr(芋)onthesoilsurfacebyorganicfertilizer.AtthecoexistenceofCu(Ⅱ),themobilityofCr(Ⅵ)inthes
8、oilwasinhibitedbecausesoilsurfaceζ-potentialbecamemorepositiveunderthepres-enceofCu(Ⅱ)andCr(Ⅵ)adsorptionwasthenpromoted.Onthecontrary,moreCr(Ⅵ)wasleachedoutofthesoilinthepre