Geochemical processes controlling dissolved selenium in the Changjiang (Yangtze) Estuary and its adjacent waters

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	Geochemical processes controlling dissolved selenium in the Changjiang (Yangtze) Estuary and its adjacent waters
	Wu Xiaodan 1; Song Jinming1 ; Wu Bin 1,2; Li Tiegang1 ; Li Xuegang 1
刊名	ACTA OCEANOLOGICA SINICA
	2014-10-01
卷号	33 期号:10 页码:19-29
关键词	dissolved selenium distribution geochemical behavior Changjiang (Yangtze) Estuary
通讯作者	Song, JM (reprint author), Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China.
英文摘要	Dissolved selenium in the Changjiang (Yangtze) Estuary and its adjacent waters was determined by hydride generation atomic fluorescence spectrometry to elucidate the source, behavior in estuary, adsorption-desorption process and biological role. In surface water, Se(IV) concentration ranged 0.05-1.14 nmol/L and Se(VI) concentration varied 0.01-1.20 nmol/L, with the means of 0.76 and 0.49 nmol/L, respectively. In bottom water, Se(IV) content varied 0.03-0.27 nmol/L and Se(VI) content ranged 0.04-0.85 nmol/L, with the averages of 0.10 and 0.40 nmol/L, respectively. High level of Se(IV) was observed near the shore with a significant decrease towards the open sea, suggesting the continental input from the adjacent rivers. Large value of Se(VI) was found in bottom water, reflecting the release from suspended sediment. Besides, high value appeared in the same latitude of the Changjiang Estuary and Hangzhou Bay illustrated the effect of lateral mixing and the long-distance transport of selenium. Se(VI), more soluble, occupied higher percentage in aqueous environment. The presence of Se(IV) resulted from the degradation of residue and the reduction of Se(VI) under anaerobic condition. The positive relationship to suspended particulate material (SPM) and negative correlation to depth indicated that Se(IV) tended to be released from the high density particulate matter. Instead, Se(VI) content did not significantly relate to SPM since it generally formed inner-sphere complex to iron hydroxide. Se(IV) content negatively varied to salinity and largely depended on the freshwater dilution and physical mixing. While, Se(VI) level deviated from the dilution line due to the in situ biogeochemical process such as removal via phytoplankton uptake and inputs via organic matter regeneration. As the essential element, Se(IV) was confirmed more bioavailable to phytoplankton growth than Se(VI), and moreover, seemed to be more related to phosphorus than to nitrogen.
学科主题	Oceanography
收录类别	SCI
语种	英语
WOS记录号	WOS:000343160500003
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/24016]
专题	海洋研究所_海洋生态与环境科学重点实验室海洋研究所_海洋地质与环境重点实验室
作者单位	1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Wu Xiaodan,Song Jinming,Wu Bin,et al. Geochemical processes controlling dissolved selenium in the Changjiang (Yangtze) Estuary and its adjacent waters[J]. ACTA OCEANOLOGICA SINICA,2014,33(10):19-29.
APA	Wu Xiaodan,Song Jinming,Wu Bin,Li Tiegang,&Li Xuegang.(2014).Geochemical processes controlling dissolved selenium in the Changjiang (Yangtze) Estuary and its adjacent waters.ACTA OCEANOLOGICA SINICA,33(10),19-29.
MLA	Wu Xiaodan,et al."Geochemical processes controlling dissolved selenium in the Changjiang (Yangtze) Estuary and its adjacent waters".ACTA OCEANOLOGICA SINICA 33.10(2014):19-29.