| WU Bin,SONG Jinming,LI Xuegang.Distribution and chemical speciation of dissolved inorganic arsenic in the Yellow Sea and East China Sea[J].Acta Oceanologica Sinica,2015,34(6):12-20 |
| 黄、东海海域溶解无解机砷分布特征与化学形态 |
| Distribution and chemical speciation of dissolved inorganic arsenic in the Yellow Sea and East China Sea |
| 投稿时间：2014-02-21 修订日期：2014-07-04 |
| DOI：10.1007/s13131-015-0682-z |
| 中文关键词: 溶解无机砷 分布 形态 黄海 东海 |
| 英文关键词:dissolved inorganic arsenic distribution speciation Yellow Sea East China Sea |
| 基金项目:The Strategic Priority Research Program of the Chinese Academy of Sciences under contract No. XDA11020102; the National Natural Science Foundation of China under contract Nos 41306055 and U1406403. |
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| 中文摘要: |
| 黄东海海域水体中溶解无机砷分布特征和化学形态研究结果显示:(1)As(III) 和As(V) 均存在于研究海域,其中后者在40%表层站位和51%底层站位为主要存在形态;(2)水平分布上,受控于咸淡水交换、表层沉积物类型和水团输运,表层水体溶解无机砷高值沿岸分布并出现在长江口和杭州湾同纬度地区,底层水体高值则出现在台湾暖流和黑潮作用的南部海域;(3)As(III) 在长江口表现为非保守行为,人源性输入是正偏离稀释线的主要原因。表层水体中,As(V)与盐度间的显著负相关性说明其在长江口行为保守,主要受控于咸淡水物理交换过程。底层水体As(V)含量则多在拟合线之上,这可能是由颗粒态和溶解态之间转化引起,但由于缺少悬浮颗粒物中砷各形态含量,尚难深入考察。因此,未来研究需着眼于基于空间分布特征定量分析溶解无机砷的源与汇。 |
| 英文摘要: |
| Distribution and chemical speciation of dissolved inorganic arsenic were examined in Yellow Sea and East China Sea. Results demonstrated that: (1) both As(III) and As(V) were detected, with As(V) dominated at 40% stations of surface water and 51% stations of bottom water; (2) influenced by the exchange of fresh and sea water, the type of surface sediment and the transport of various water masses, large values in surface water were observed along the coastal region and in the same latitude of Changjiang River Estuary and Hangzhou Bay, and in bottom water found in the southern area where the Taiwan Warm Current and Kuroshio Current influenced; (3) As(III) behaved non-conservatively in Changjiang River Estuary. Man-derived inputs cause substantial positive deviation from the theoretical dilution. The negative correlation of As(V) to salinity in surface water suggested that it behaved conservatively during the transportation along Changjiang River Estuary. While, the occurrence of As(V) up to the linear fit in bottom water indicated the eventual transfer from dissolved phase to particulate phase, which was impossible to be determined without the knowledge of arsenic level and speciation in suspended particulate matter. Further study is needed on the arsenic source/sink relationships based on the distribution profiles. |
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