三峡库区消落带土壤中施用磷肥对环境激素铅吸附-解吸的影响.pdf

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1、农业环境科学学报2010，29(5)：923-929JournalofAgro—EnvironmentScience三峡库区消落带土壤中施用磷肥对环境激素铅吸附一解吸的影响方卢秋，田足(长江师范学院化学化工学院，重庆涪陵408100)摘要：采用室内模拟施肥、恒温振荡平衡法研究了磷肥种类、磷肥浓度、铅离子浓度、离子强度和酸度影响三峡库区消落带土壤对铅离子的吸附量和解吸量。结果表明：(1)磷肥种类与铅离子的吸附量和解吸量显著相关，施用Ca(H2PO。)：使铅离子的吸附量和解吸量相对较小；(2)土壤铅离子的吸附量和解吸量与施用磷肥浓度

2、呈显著相关，建议选用磷酸二氢钙、磷酸二氢铵、磷酸二氢钾3种磷肥，施用量在3．4066-8．5164kgP20，·666．6m。2之间较为合适；(3)铅离子浓度极显著地影响土壤吸附和解吸铅离子，随着铅离子浓度的增加，吸附量和解吸量都呈逐渐增加的趋势；(4)离子强度和酸度都极显著地影响土壤吸附和解吸铅离子，建议选用磷酸二氢钙盐、钾盐和铵盐作为磷肥，可以减小土壤铅离子的环境风险。关键词：三峡库区；消落带；磷肥；铅离子；吸附量；解吸量中图分类号：X53文献标志码：A文章编号：1672—2043(2010)05-0923—07Effect

3、sofPhosphateFertilizeronEnvironmentalHormonePbAdsorption-DesorptioninSoftoftheWater--Level-FluctuatingRegionofThreeGorgesReservoir,ChinaFANGLu-qiu．TIANZu(CollegeofChemistryandChemicalEngineering，YangtzeNormalUniversity，Chongqing408100，China)Abstract：Thetypeofphosphat

4、efertilizer,concentrationofphosphatefertilizer,concentrationofPbion，ionicstrength，acidityonsoil’SPbionadsorptioncapacityanddesorptioncapacityinwater——level-fluctuatingofThree-Gorgereservoirregionwereinvestigatedbyusingcon——stanttemperatureoscillationbalanceandsimulat

5、ionofindoorfertilizationmethod．Theresultswereasfollowing：(1)ThetypeofphosphatefertilizerhadasignificantrelatedtoadsorptioncapacityanddesorptioncapacityofPbion，applicationofCa(H2P04)2madePbion7Sadsorp—tioncapacityanddesorptioncapacityrelativelysmaU．(2)Pbion’sadsorptio

6、ncapacityanddesorptioncapacityhadaClOSerelationwithphos—phatefertilizer7Sconcentration．SelectingthreekindsofphosphatefertilizerCa(HzP04)2，NH4H2P04，KH2I)04wasadviced．3．4066-8．5164kgP20s·666．6m五asthebestfertilizationcapacityofphosphatefertilizerWasmoreappropriate．(3)So

7、iladsorptionanddesorptionPbionhadacloserelationwithPbion’Sconcentration．WithincreasingofPbion’Sconcentration，adsorptioncapacityanddesorptioncapacityassumedalluptrend．(4)TbeinfluenceofionicstrengthandacidityonsoiladsorbtionanddesorptionPbWasextremelysignificant．Select

8、ionofsaltofCa(It世04)2，NH,dX-12P04，KHzP04asaphosphatefertilizertothesoiltoreducetheenvironmentalrisksWasrecommended．Inshort，theCOIl-