摘要:
本文对海口湾溶解态铜、铅、锌、镉进行了测定.铜的变化范围为:0.47～1.16μg/dm3,平均值为0.78μg/dm3;铅的变化范围为:0.94～2.36μg/dm3,平均值为1.36μg/dm3;锌的变化范围为:1.28～4.83μg/dm3,平均值为3.14μg/dm3;镉的变化范围为:0.005～0.072μg/dm3,平均值为0.030μg/dm3,Cu、Zn的溶解态含量在龙昆路生活污水排污沟口、秀英工业排污沟口及海甸溪口的测站相对较高,Pb、Cd溶解态含量较低,湾内各站平面分布较为均匀.它们的溶解态含量垂直变化趋势为:Cu、Pb、Zn底层大于表层,而Cd表层大于底层.对Cu、Pb、Zn、Cd的颗粒态含量也进行了测定,指出海口湾海水中的颗粒物对重金属的净化起一定作用.对铜的溶解态中的强络合态和不稳态铜也进行了研究,强络合态占总溶解态的比例均在85%以上,对生物起毒性作用有关的不稳态铜含量很低,均小于5nmol/dm3,表明目前海口湾海水中的重金属铜不会对生物生长产生影响.
关键词:
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海口湾 /
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海水 /
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重金属 /
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行为特征
Abstract:
Dissolved Cu, Pb, Zn and Cd in the Haikou Bay waters were measured to be respectively in the range concentrations of 0.47～1.16 μg/dm3, 0.94～2.36 μg/dm3, 1.28～4.83 μg/dm3 and 0.005～0.072 μg/dm3; with respectively average values of 0.78 μg/dm3, 1.36 μg/dm3, 3.14 g/dm3 and 0.03 μg/dm3.Dissolved Cu and Zn concentrations are relatively high at the stalions near the Longkun Road Outfall for domestic sewage, the Xiuying Outfall for industry waste water and Haidian Island estuary, but dissolved Pb and Cd concentrations are low in these stations. The values in other stations are comparatively homogenous. Vertical dissolved Cu, Pb and Zn concentrations at the bottom layer are higher than those at the surface layer, but dissolved Cd concentration appears to be on the opposite. The measurement results of Cu, Pb, Zn and Cd in suspended particles show that particulate matters in the Haikou Bay seawater play a role in purifying heavy metals. The study on strong complexed form and non-Gable form of dissolved copper shows that the ratio of strong complexed form and dissolved form is about 85%,and non-Gable formic very low with a value lower than 5nmol/dm3. Therefore, copper in the Haikou Bay seawater can not cause influence on marine organisms.
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