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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]=[As5+]+[As3+])和亚砷酸盐(As3+)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,As3+)。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As3+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,表现出与叶绿素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。
In this paper, the distribution of total dissolved inorganic arsenic (TDIAs, [TDIAs] = [As5 +] + [As3 +]) and arsenite (As3 +) in the Yellow and East China Seas And seasonal changes. The survey area covered different hydrological and chemical properties of the Yellow Sea and the East China Sea. The study focused on the PN section along the Yangtze River estuary to the southeastern Ryukyu Islands to discuss the impact of terrestrial transport on the marginal sea of China. Different patterns of arsenic (TDIAs, As3 +) were analyzed by hydride generation atomic fluorescence spectrometry (HG-AFS). The impact of terrestrial transport of TDIAs is higher in the nearshore region, and decreases gradually as the offshore distance increases. The high value center of TDIAs also exists in the sub-bottom water of the continental shelf slope break of the East China Sea. This region has the characteristics of low temperature, high salinity and low suspended particulate matter content. It shows that Kuroshio water on the invaded shelf is another major source of TDIAs in the shelf area. The seasonal variation trend of TDIAs is affected by the seasonal and interannual variations of the amount of red water in the Yangtze River and the shelf intrusion of the Kuroshio. In contrast to TDIAs, the distribution characteristics of As3 + in the study area are affected by phytoplankton activities and their contents, distributions and seasonal changes show a positive correlation with chlorophyll content. The As / P stoichiometry of the PN section of the East China Sea shelf is about 2 × 10-3. The contents of dissolved arsenic in the Yellow Sea and the East China Sea are similar to those in other parts of the world, indicating that they are not significantly affected by anthropogenic activities.