简介：

简介：

简介：

简介：从Guiyang的不同功能的地区收集的62土样被ICPspectrometry为全部的集中和Cr，Cu，Pb，Zn和Cd的顺序的抽取分析。在Guiyang的土壤的Cr，Cu，Pb，Zn和Cd的平均全部的集中分别地是92.9，51.6，44.1，139.3和0.28mg/kg。土壤被Cr，Cu，Pb，Zn和Cd与Guiyang的背景值比较弄脏到某程度。重要差别在不同功能的地区在Cr，Cu，Pb，Zn和Cd的集中被认出。在剩余部分主要至于顺序的抽取，Cr，Cu和Zn是在场的，并且Pb在可氧化的部分主要是在场的。Cd的可约的部分占47.5%，并且剩余部分最低。活动性和重金属的简历可获得性跟随Cd>Pb>Cu>Cr>Zn的顺序。

简介：Theredoxcycleofironandmanganeseisamajorgeochemicaprocessattheboundarylayersoflakesediments.LakeAha,whichliesinthesuburbsofGuiyangCity,GuizhouProvince,China,isamedium-sizedartificialreservoirwithseasonallyanoxichypolimnion,Long-termsedimentaryaccumulationofironandmanganeseresultedintheirenrichmentintheuppersediments,Intheanoxicseason,Fe^2+andMn^2+,formedbydiologicaloxidation,woulddiffuseuptooverlyingwatersfromsediments.However,theconcentrationofoxidation,woulddiffuseuptooverlyingwatersfromsediments,However,theconcentrationofFe^2+increasedlateranddecreasedearlierthanthatofMn^2+.Generally,sulfatereductionoccurredat6cmbelowthesediment-waterinterface.Whereas,intheanoxicseason.thereductionreacheduppersediments,inhibitingthereleaseofFe^2+,TheFeconcentrationofanoxicwaterisquicklydecreasedfromhightolowasaresultofreductionofthesuplhursystem.