Arsenic content, fractionation, and ecological risk in the surface sediments of lake
Arsenic content, fractionation, and ecological risk in the surface sediments of lake
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湖泊表层沉积物中砷含量、分馏及生态风险
DOI：
10.1007/s13762-011-0015-5
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发表时间：
2011
影响因子：
3.1
通讯作者：
Zhong, X.
中科院分区：
文献类型：
--
作者：
Wang, S. L.;Lin, C. Y.;Cao, X. Z.;Zhong, X.
南四湖受到长期密集的工业和城市活动的严重影响。研究南四湖沉积物中砷的含量、分布和生态风险，探讨砷的形态与沉积物矿物相的地球化学关系。采集了20个表层沉积物样品，分析了砷的含量和化学形态。结果表明，沉积物中总砷含量为8.27 ~ 21.75mg/kg，平均为13.45mg/kg。砷主要与铁氧化物结合（67.3%），其次是与残渣态结合（19.2%）。此外，沉积物中总砷含量与有机质和铁含量呈正相关。氧化铁结合砷含量与铁含量的摩尔比低于天然赤铁矿、磁铁矿和针铁矿的砷与铁的最大摩尔比。沉积物中总砷含量通常高于淡水沉积物中砷的阈值效应浓度（9.79mg/kg），但低于可能效应浓度（33.0mg/kg）。南四湖沉积物中的砷对水生生物造成的不良影响或毒性可能会在这些砷污染水平下发生。
The Nansi Lake has been seriously affected by long-term intensive industrial and urban activities. The objectives of this study were to determine the content, distribution, and ecological risk of arsenic and investigate the geochemical relationships between arsenic forms and sediment mineral phases of the Nansi Lake. Twenty samples of surface sediments were collected and analyzed for arsenic contents and chemical forms. Results indicated that total content of arsenic in the sediment samples averaged 13.45 mg/kg and ranged from 8.27 to 21.75 mg/kg. The arsenic was mostly associated with iron oxides (67.3%), followed by the association with the residual fraction (19.2%). In addition, total content of arsenic was positively correlated with the organic matter and iron contents in the sediment. The molar ratios of iron oxide bound arsenic content to iron content are lower than the maximal molar ratios of arsenic to iron for natural hematite, magnetite, and goethite. The total content of arsenic in the sediment samples was usually higher than threshold effect concentration of 9.79 mg/kg, but lower than probable effect concentration of 33.0 mg/kg for arsenic in freshwater sediments. Adverse effects or toxicity to the aquatic organisms, caused by arsenic in the sediments of the Nansi Lake, will likely occur at these levels of arsenic contamination.
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影响因子：
--
作者：
赵一阳;鄢明才
通讯作者：
赵一阳;鄢明才
影响因子：
2.7
作者：
MacDonald, DD;Carr, RS;Ingersoll, CG
通讯作者：
Ingersoll, CG
影响因子：
13.6
作者：
Asta, Maria P.;Cama, Jordi;Gimenez, Javier
通讯作者：
Gimenez, Javier
DOI：
10.1007/bf03325905
发表时间：
2006-04
影响因子：
3.1
作者：
A. Karbassi;I. Bayati;F. Moattar
通讯作者：
A. Karbassi;I. Bayati;F. Moattar
DOI：
10.1007/bf03326153
发表时间：
2010-06
影响因子：
3.1
作者：
K. Sekabira;H. O. Origa;T. Basamba;G. Mutumba;E. Kakudidi
通讯作者：
K. Sekabira;H. O. Origa;T. Basamba;G. Mutumba;E. Kakudidi