摘要
研究了三亚湾和榆林湾海区溶解态重金属（ Ｃｕ 、 Ｐｂ 、 Ｚｎ 、 Ｃｄ 、 Ｃｒ） 的浓度和分布。结果发现表层重金属 Ｃｕ 、 Ｐｂ 、 Ｚｎ 、 Ｃｄ 、 Ｃｒ 的平均浓度分别为０９７ 、２１０ 、１１４７ 、００８７ 、０２９ μｇ／ Ｌ，符合一类海水水质标准，表明此海区还没受到重金属的污染。表层海水中 Ｃｕ 和 Ｚｎ 与盐度呈负相关，有较大的河流输入； Ｃｒ 与盐度有正相关，浓度从河流到远岸有增高的趋势，这和三亚湾外海高盐水的涌入有关； Ｐｂ 、 Ｃｄ 与盐度无显著相关性，表明还存在其他过程如： 悬浮颗粒物的清除，大气沉降和不同水团间的混合等过程影响着它们的含量。调查发现除 Ｃｒ 外其他重金属浓度在远岸站位底层有明显增加，这种分布可能和海区底部存在较大的沉积物向上覆水的输入有关。因此海区重金属分布不但受本身物化性质的影响。
The concentrations and distributions of the dissolved trace metals (Cu、Pb、Zn、Cd、Cr) in Sanya and Yulin Bay, Hainam have been investigated. The results showed that the average concentrations of Pb、Cu、Zn、Cd、Cr in the surface water were 0 969、2 100、11 47、0 087、0 289 μg/L, respectively, and were less than the first grade of the National Seawater Standard, and that the sea has not been polluted, but the concentrations were somewhat increased. Based on the results of the correlation analysis between the surface concentrations and the salinity, Cu and Zn were negatively correlated to the salinity, because of the river water. Cr was positively correlated to the salinity with the concentration increasing from the coast because of the gush with the open saline water. Pb and Cd were not correlated to salinity, the concentrations were related to the other processes, such as: scavenging of the suspended mater, atmospheric fall and the mixing of different water masses. As to the vertical distribution, the bottom concentrations have remarkably increased except Cr, this could be attributed from the sediment, at least in summer. So the distributions were impacted not only by the physical chemical properties of the individual metals, but also by the environmental factor.
出处
《海洋环境科学》
CAS
CSCD
北大核心
1999年第2期31-37,共7页
Marine Environmental Science
基金
香港科技大学研究中心项目
国家海洋局第二海洋研究所合作项目
