| 黄、东海溶解态无机砷的分布及其季节变化 |
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| 引用本文： | 任景玲,刘素美,张经.黄、东海溶解态无机砷的分布及其季节变化[J].海洋通报(英文版),2009,11(1):24-36. |
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| 作者姓名： | 任景玲 刘素美 张经 |
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| 作者单位： | 1. 中国海洋大学,海洋化学理论与工程技术教育部重点实验室,山东,青岛,266100
2. 华东师范大学,河口海岸国家重点实验室,上海,200062 |
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| 基金项目： | 国家自然科学基金，国家重点基础研究发展规划(973计划)，the captains and crew of R/V Dong Fang Hong 2 |
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| 摘 要： | 本文综合2000～2003年期间9个航次的研究结果，讨论了总溶解态无机砷（TDIAs，TDIAs]=As^5＋]＋As^3＋]）和亚砷酸盐（As^3＋）在黄、东海的分布和季节性变化。调查海区覆盖了黄、东海不同水文和化学性质的区域，研究重点放在自长江口向东南琉球群岛沿伸的PN断面以讨论陆源输送的物质对中国陆架边缘海的影响。利用氢化物发生原子荧光光谱法（HG-AFS）分析砷的不同形态（TDIAs，As^3＋）。TDIAs受河流陆源输送的影响在近岸区域含量较高，并随着离岸距离的增加含量逐步下降。在东海陆架坡折带的近底层水中也存在TDIAs的高值中心，此区域具有低温、高盐、低悬浮颗粒物含量的特征，显示出入侵陆架的黑潮水是陆架区TDIAs另一个主要的源。TDIAs的季节性变化趋势受到长江冲淡水水量及黑潮入侵陆架强度的季节及年际变化共同影响。研究区域中As^3＋的分布特征与TDIAs相反，其含量、分布及季节性变化受到浮游植物活动的影响，表现出与叶绿索含量存在正相关关系。夏季东海陆架PN断面中As／P的化学计量比值约为2×10^3。黄、东海溶解态砷的含量与世界其它海区相近，表明其未受到明显人为活动的影响。
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| 关 键 词： | 溶解态砷 形态 黄东海 分布及季节变化 |
Dissolved Inorganic Arsenic in the Yellow Sea and the East China Sea-Distributions and Seasonal Variations |
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| REN Jing-ling,LIU Su-mei,ZHANG Jing.Dissolved Inorganic Arsenic in the Yellow Sea and the East China Sea-Distributions and Seasonal Variations[J].Marina Science Bulletin,2009,11(1):24-36. |
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| Authors: | REN Jing-ling LIU Su-mei ZHANG Jing |
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| Institution: | 1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, 238 Songling Road, Qingdao 266100, Shandong province, China; 2. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China) |
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| Abstract: | The distributions and seasonal variations of total dissolved inorganic arsenic (TDIAs, TDIAs] = As5+]+As3+]) and arsenite (As3+) in the Yellow Sea and East China Sea are presented here based on the observations of 9 cruises carried out in 2000 - 2003. The study area covers a broad range of hydrographic and chemical properties. The emphasis is put on a southeast transect from Changjiang Estuary to the Ryukyu Islands (I.e. PN section) in the East China Sea to discuss the impact of terrestrial input on the marginal seas of China. Arsenic species (TDIAs and arsenite) are determined by selective hydride generation - atomic fluorescence spectrometry (HG-AFS). TDIAs concentrations were high in the coastal area of Changjiang Estuary and decreased slightly towards the shelf region. High concentrations of TDIAs were also existed in the near bottom layer of shelf edge of the East China Sea which indicated another source of arsenic from the incursion of Kuroshio Waters. The seasonal variations of TDIAs in the study area depend on the hydrographic stages of Changjiang and the incursion intensity of Kuroshio Waters. Arsenite showed opposite distributions with TDIAs, with higher concentrations appeared at the surface layer of shelf region, which was positive correlated with the chlorophyll a. Biological conversion of arsenate into arsenite was hypothesized for the observed distribution pattern and its seasonal variations. The stoichoimetric ratios of As to P were estimated to be about 2×10-3 at PN Section in summer. The concentrations of dissolved arsenic in the Yellow Sea and East China Sea were comparable with other areas in the world. |
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| Keywords: | dissolved arsenic species Yellow Sea and East China Sea distributions and seasonal variations |
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