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1、農(nóng)業(yè)環(huán)境科學(xué)學(xué)報2010,29(增刊):127—131Jouma/ofAgro-EnvironmentScience土壤富里酸對鉛的吸附作用與影響因素的研究翟瑩雪1,魏世強2(1.西南大學(xué)地理科學(xué)學(xué)院,重慶400715;2.西南大學(xué)資源與環(huán)境學(xué)院,重慶400715)摘要:采用改進的連續(xù)電位滴定法,研究了土壤富里酸對重金屬鉛吸附量的主要影響因素。通過調(diào)節(jié)富里酸溶液的pH值、富里酸濃度、溫度和離子強度,得到吸附量的變化情況,結(jié)果表明:溶液pH從10.0滴定至2.5,富里酸對鉛的吸附量降低,pH對吸附最的影
2、響可用自然對數(shù)方程進行擬合,通過各處理中自然對數(shù)方程的比較得出,富里酸濃度越小、金屬離子濃度越大,方程的斜率越大,說明吸附量的大小同時與二者密切相關(guān);溶液中富里酸濃度升高,相應(yīng)的吸附鼉降低,但吸附率升高;溫度升高,吸附量增加;離子強度在設(shè)定的范圍內(nèi),從0.1mol·L“加大至0.5tool·L~,吸附量逐步降低。關(guān)鍵詞:富里酸;鉛;電位滴定;吸附中圖分類號:X53文獻標識碼:A文章編號:1672-2043(2010)增刊一0127—05InfluencingFactorsandLeadAdsorpti
3、onbySoilFulvicAcidZHAIYing—xuel.WEIShi—qian92(1.SchoolofGeographicalSciences,SouthwestUniversity,Chongqing400715,China;2.SchoolofResourcesandEnviron—ment,SouthwestUniversity,Chongqing400715,China)Abstract:Insoft,F(xiàn)A(fulvicacid)Callcontroltheleadions’biol
4、ogicvalidity,whichcanbeinfluencedbyseveralsoilcondi·tionssuchasFAconcentration,pH,temperatureandionstrengthinFA—leadsolution.Inthisstudythemodifiedpotentiomet—rictitrationwasused.WechangedthepH,theconcentrationofFA,thetemperatureandtheionstrengthinFA—le
5、adsolutionandfoundthatthisfourrottersabovecanallaffecttheinteractionofFAwit}lleadions.BytitratingtheFA—leadsolution.theconclusioncouldbedrawn鵲follows:theamountofleadionsabsorbedbypergramoffulvicacidgrewwiththeincreasingofpHfrom2.5to10.0.whichcouldbesimu
6、latedbythenaturallogisticequation.ThehigerconcentrationofFAandthelowerconcentrationofleadions,thelowerslopeoftheequationwas,whichprovedthattheamountofleadionsabsorbedbypergramoffulvicacidcouldbeaffecvedbyfulvicacidandleadions’concentrationsimultaneously
7、.Throughchangingtheconcentrationoffulvicacidinthesolution,wegotresultsasfollows:higherconcentrationoffulvicaciddecreasedtheamountofcadmiumi-lionsabsorbedbypergramfulvicacidandthepercentageofleadionsabsorbedbyFAdecreasedwiththedecliningofpHandtheconcentr
8、ationoffulvicacidinthesolutionhighertempratureandlowerionstrengthmadetheamountofleadionsabsorbedbypergramoffulvicacidgrow.Keywords:fulvicacid;lead;potentiometrictitration;adsorption土壤鉛污染是我國較為嚴重的土壤環(huán)境問題之收稿日期:2009—08—27基金項目:西南大學(xué)青年基金