| 长江口及其邻近海域溶解硒的地球化学控制过程研究 |
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| 引用本文： | 吴晓丹,宋金明,吴斌,李铁刚,李学刚.长江口及其邻近海域溶解硒的地球化学控制过程研究[J].海洋学报(英文版),2014,33(10):19-29. |
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| 作者姓名： | 吴晓丹 宋金明 吴斌 李铁刚 李学刚 |
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| 作者单位： | 中国科学院 海洋研究所, 青岛 266071, 中国;中国科学院 海洋研究所, 青岛 266071, 中国;中国科学院 海洋研究所, 青岛 266071, 中国;中国科学院大学, 北京100049, 中国;中国科学院 海洋研究所, 青岛 266071, 中国;中国科学院 海洋研究所, 青岛 266071, 中国 |
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| 基金项目： | The National Natural Science Foundation of China for Creative Research Groups under contract No. 41121064; the Strategic Priority Research Program of the Chinese Academy of Sciences under contract No. XDA05030402; the National Basic Research Program of China (973 Program) under contract No. 2011CB403602; the National Natural Science Foundation of China under contract No. 41306055. |
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| 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.
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| 关 键 词： | 生物地球化学过程 邻近海域 长江口 过程控制 溶解 氢化物原子荧光光谱法 硒 横向混合 |
| 收稿时间： | 2013/4/18 0:00:00 |
| 修稿时间： | 2013/12/13 0:00:00 |
Geochemical processes controlling dissolved selenium in the Changjiang (Yangtze) Estuary and its adjacent waters |
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| Wu Xiaodan,Song Jinming,Wu Bin,Li Tiegang and Li Xuegang.Geochemical processes controlling dissolved selenium in the Changjiang (Yangtze) Estuary and its adjacent waters[J].Acta Oceanologica Sinica,2014,33(10):19-29. |
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| Authors: | Wu Xiaodan Song Jinming Wu Bin Li Tiegang and Li Xuegang |
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| Institution: | 1.Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China2.Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | 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. |
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| Keywords: | dissolved selenium distribution geochemical behavior Changjiang (Yangtze) Estuary |
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