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时间:2020-05-22
《零价铁固定稻田土壤砷的持久性研究-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第28卷第2期水土保持学报Vo1.28NO.22014年4月JournaIofSoiIandWaterC0nservationApr.,2O14零价铁固定稻田土壤砷的持久性研究胡立琼,曾敏,雷鸣,廖柏寒,周航(1.中南林业科技大学林学院,长沙410004;2.湖南农业大学生物科学技术学院,长沙410128)摘要:通过水稻盆栽试验,用零价铁固定湖南郴州污染稻田土壤中砷,分析水稻种植前和收获后水稻土中各形态砷、浸出砷及各形态铁含量的变化,研究零价铁固定稻田土壤砷效果的持久性,并从形态作用方面初步探讨固定机理。结果表明,零价铁显著降低水稻种植前和收获后土
2、壤易溶型砷(wE—As)含量。在最大添加量8.00g/kg时,零价铁使种植前和收获后土壤中wE—As分别比对照降低77.5%和74.7。零价铁亦显著降低种植前土壤砷浸出量(p3、、铁型砷(Fe—As)反应,使其主要向稳定性强的残渣态砷(Rs—As)转化。关键词:零价铁;稻田土壤;砷;持久性;砷形态中图分类号:X131.3;$153文献标识码:A文章编号:1009—2242(2014)02—0267—05PersistenceofImmobilizationEffectsOilArsenicinPaddySoilUsingZero—valentIronHULi—qiong,ZENGMin,LEIMing,LIAOBo—han,ZHOUHang(1.CollegeofForestry,CentralSouthUniversit4、yofForestryandTechnology,Changsha410004;2.CollegeofBioscienceandTechnology,HunanAgriculturalUniversity。Changsha410128)Abstract:Aricepotexperimentwasconductedtostudythepersistenceofimmobilizationeffectsonpaddysollarsenic(As)usingzero-valentironandtheAsimmobilizationmechanisms.D5、ifferentamountsofzero~valentironwereaddedintoAscontaminatedpaddysoilwhichwassampledinChenzhouofHunanprovince.Beforericeplantingandafterharvesting,thecontentsofAsfractions,leachableAsandiron(Fe)fractionsinimmobilizedsoilsweredetermined.Theresultsshowedthatzero—valentironsignifi6、cantlvdecreasedthecontentsofsoilWE—Asbeforericeplantingandafterharvesting.Whentheadditionamountofzero—valenti—ronreachedthemaximumlevel(8.00g/kg),thesoilWE~Asdecreasedby77.50Abeforericeplantingand74.7afterriceharvesting,comparedwiththecontro1.Moreover,leachableAsinsoildecrease7、dsignifi—cantlybeforericeplanting(p8、t,thezero—valentironwasfirsttransformedintothoseironfractions
3、、铁型砷(Fe—As)反应,使其主要向稳定性强的残渣态砷(Rs—As)转化。关键词:零价铁;稻田土壤;砷;持久性;砷形态中图分类号:X131.3;$153文献标识码:A文章编号:1009—2242(2014)02—0267—05PersistenceofImmobilizationEffectsOilArsenicinPaddySoilUsingZero—valentIronHULi—qiong,ZENGMin,LEIMing,LIAOBo—han,ZHOUHang(1.CollegeofForestry,CentralSouthUniversit
4、yofForestryandTechnology,Changsha410004;2.CollegeofBioscienceandTechnology,HunanAgriculturalUniversity。Changsha410128)Abstract:Aricepotexperimentwasconductedtostudythepersistenceofimmobilizationeffectsonpaddysollarsenic(As)usingzero-valentironandtheAsimmobilizationmechanisms.D
5、ifferentamountsofzero~valentironwereaddedintoAscontaminatedpaddysoilwhichwassampledinChenzhouofHunanprovince.Beforericeplantingandafterharvesting,thecontentsofAsfractions,leachableAsandiron(Fe)fractionsinimmobilizedsoilsweredetermined.Theresultsshowedthatzero—valentironsignifi
6、cantlvdecreasedthecontentsofsoilWE—Asbeforericeplantingandafterharvesting.Whentheadditionamountofzero—valenti—ronreachedthemaximumlevel(8.00g/kg),thesoilWE~Asdecreasedby77.50Abeforericeplantingand74.7afterriceharvesting,comparedwiththecontro1.Moreover,leachableAsinsoildecrease
7、dsignifi—cantlybeforericeplanting(p8、t,thezero—valentironwasfirsttransformedintothoseironfractions
8、t,thezero—valentironwasfirsttransformedintothoseironfractions
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