forsoilreducibletracemetalschangesthesubsequentoxidisablemetalfractioninsequentialextractionschemes[J].hemistry,1998,72:59⁃75[26] LuoYM,ChristieP.Bioavailabilityofcopperandzincinsoilstreatedwithalkalinestabilisedsewagesludges[J].JournalofEnvironmentalQuality,1998,27(2):347⁃354[27] LiRY,YangH,ZhouZG,etal.FractionationofheavymetalsinsedimentsfromDianchilake,China[J].Pedosphere,2007,17(2):265⁃272[28] PerinG,CraboleddaL,heseM.etal.HeavymetalspeciationinthesedimentsofNorthernAdriaticSea⁃Anewapproachforenvironmentaltoxicitydetermination[J].HeavyMetalintheEnvironment,1985,5:454⁃456[29] MarcoTG,JoaquínD,StefanoA,etal.HeavymetalsfractionationandmultivariatestatisticaltechniquestoevaluatetheenvironmentalriskinsoilsofHuelvaTownship(SWIberianPeninsula)[J].JournalofGeochemicalExploration,2012,119:32⁃43