title: [Heavy metal speciation and stability in the sediment of Lihu Lake].
abstract: The spatial occurrence characteristics of the speciation of Cr, Ni, Cu, Zn, As, Cd, Hg and Pb in sediments of the lake body and river mouths of Lihu Lake were studied. Meanwhile, combined with the spatial distribution of metals in interstitial water, the stability and bio-availability of various forms of studied metals were discussed. The results showed that metals in interstitial water and extractable metals in surface sediments both had obvious spatial heterogeneity, and the metal contents in retreated fishery district were lower. High value areas of Cr, Cu and Zn distributed in belt along Baojie Bridge and Lihu Lake Bridge, and the high value areas of Ni, As, Cd, Hg distributed in sector extending from river mouths to the lake body. Most metals mainly existed in residue state except for Cd, Cu and Ni, the extractable content of which respectively accounted for 71.02%, 54.79% and 50.62% of the total content. The stability of eight studied metals was in the order of Cr > Pb > Hg > As > Cu > Ni > Zn > Cd. Cd and Zn were unstable in most studied sites, so there was higher risk of quick desorption and release. Toxicity assessment of interstitial water showed that the tested metals would not pose acute toxicity for aquatic ecosystem, but Hg and Pb in some districts, especially in the river mouths, might pose chronic toxicity for the benthonic organisms.
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China. shuhang125126@163.com
authors.forename: Shu-hang
authors.initials: SH
authors.lastname: Wang
authors.forename: Wen-wen
authors.initials: WW
authors.lastname: Wang
authors.forename: Xia
authors.initials: X
authors.lastname: Jiang
authors.forename: Qian-wen
authors.initials: QW
authors.lastname: Song
mesh_terms: D002681:China; D017753:Ecosystem; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D060106:Lakes / Q000737:chemistry*; D019216:Metals, Heavy / Q000737:chemistry*; D018570:Risk Assessment; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D019216:Metals, Heavy; D014874:Water Pollutants, Chemical