硫酸盐还原菌介导土壤中二苯砷酸的吸附-解吸特征

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关键词：二苯砷酸；硫酸盐还原菌；吸附-解吸；铁还原；硫酸盐还原中图分类号：X53 文献标志码：A 文章编号：1672-2043（2025）06-1497-09 doi：10.11654/jaes.2024-0478

Characterization of adsorption-desorption of diphenylarsenicacid in soil mediated by sulfate-reducing bacteria

XING Qianwen12，LU Lulu1，3，TU Chen"，LIU Ying1，LUO Runlai4，LI Zhongyuan4，LUO Yongmingl （1.StateKeyLaboratoyfSlndustaiableAgriculture，IstituteofSoilence，ineseAcadeyofSiences，ing， China;2.SchoolofGegapicalScience，HunanNoalUniversityhangsha410081，China;3.ShoolofChemicalEnging BeijigUniversityoficalTecoogeijingo9，Chia;4CECEcoEnvioentalEngieringResearchter（il RemediationTechnologyandEquipment），ChinaConstructionEighthEngineringDivisionCo.，Ld.，Shanghai244，Cina） Abstract：Thisstudyexploresteadsorptio-desortionietisofdipheylarsicacid（DA）infeydriteandbacksoildated bysulfate-reducingbacteria（Clostridiumsp.SRB-2），andclarifiesthecouplingmechanismofDPAAwithsulfurandironcyclesin ferihyriteadldiatedyR-2.InthissudyDAAwasseleedastetargetpltantlacksoil，epredoiantsiltyen theJapanesehemicalweaponuralassusdastetstsoilFeihdrite，teprnipalonmiralinhacksilsosn asthetestironmineral，andtesulfatereducingbacterum（Cltridumsp.SRB-2）wasusedstheteststrain.UsingHPL-M/MS，we foundthatintheadsoptionexperiments，trdriteithSB-2ioulationsignifiantlydereasedtheAAdsotioncoaredto thenon-inoculatedcontrolgroupafter8hourssincetheexperimentstarted，whileintheblacksoilsystem，theadsorptioncapacityof DPAA increasedalongwiththeculturetime.Inadition，theadsorptioncapacityof DPAA inthe SRB-2inoculationgroup was significantlylowerthanthatoftecontrolwithin24h.Inthedesorptionexperiments，inoculationwithSRB-2promotedtheeleaseof DPAAfromferhdriteandblacksoil.ThestrainSRB-2icreaedpHtoroud70decreasedtheconcentrationsofsulfateot51 mg. L-1 and 1 425 mg* L-1 ，and reduced the redox potential to -263 mV and -352 mV. These changes enhanced the reduction of iron oxides （to > 80%and >90% of the total iron），thereby leading to the release of DPAA.The main transformation product was diphenylthioarsinic acidDPTAA）.ThestudyindicatedthatinoculationofClostridiumsp.SB-could promotesulfatereductiontogeneratehighlyrductie sulfides.Tesesulidesintuusedteductivedsolutioofooxisintesoilsm，ladingtoteleaseofdsobed onthesoilsolidphasesurfaceintothesolutionenvironment，thusfacilitating the transformationofDPAA mediatedbySRB-2. KeyWords：Diphenylarsinicacid（DPAA）;sulfatereducing bacteria;adsorptionanddesorption;ironreduction;sulfatereduction

二苯砷酸（Diphenylarsinic acid，DPAA）是二战以来日本残留化学武器地区土壤中最常见的有机砷类污染物，能通过土壤（地下水）-植物-人体等多种途径危害人类健康。（剩余15824字）