胶州湾水域重金属As的分布及质量浓度

Distribution and Mass Concentration of As in the Jiaozhou Bay

根据1981年的胶州湾水域调查资料,分析了重金属As(砷)在胶州湾水域的分布、迁移和季节变化。研究结果表明:As在胶州湾水体中的表层质量浓度范围为1.00～2.70μg/L,底层质量浓度范围为1.00～2.40μg/L。在一年中,胶州湾整个水域都未受到As的污染。在胶州湾水域,As的质量浓度来源于河流的输送,其质量浓度小于2.70μg/L。在陆地迁移过程中,在胶州湾周边地区的土壤、水体没有受到As的污染,进而使得胶州湾周边河流的As质量浓度也非常的低。在水域迁移过程中,在胶州湾,As的表、底层质量浓度都相近。在时间尺度上,夏季胶州湾的表层水体中As的质量浓度几乎都高于春季。而在整个湾内底层水体中,春季和夏季的As底层质量浓度都没有高低可分的。在空间尺度上,在海泊河的入海口的近岸水域,As在底层质量浓度中比较高。而在湾口的近岸水域,As在表层质量浓度比较高。这揭示河流的输送能力决定了底层质量浓度的分布和表、底层的垂直分布。

Based on the data from t distribution, migration and season been shown that the mass concent the surfacial water of the bay and the whole year, all the waters of he survey carried out in the Jiaozhou Bay in 1981, the al variation of heavy metal As were analyzed. It has ration of As ranges from 1.00μg/L to 2. 70 μg/L in from 1.00μg/L to 2.40μg/L in the bottom water. In the Jiaozhou Bay is not subjected to the pollution of As. The mass concentration of As in the waters of the bay, which is mostly lower than 2.70 μg/L, is mainly attributed to the contributions of the rivers surrounding the bay. During the migration in land, no pollution of As has been found in the soils and waters surrounding the bay so that the mass concentration of As is very low in the rivers around the bay. During the migration in water, the mass concentration of As are similar in both the surface and the bottom water. Temporally, the mass concentration of As in the sur- face water appears higher in summer than in spring, whereas in the bottom water of the whole bay the mass concentration of As does not differ distinctly between summer and spring. Spatially, the mass concentration of As is relatively higher in the bottom water near the entrance of the Haibo River and in the surface water near the mouth of the bay. This may imply that the delivery capacity of the river determines the distribution pattern of As mass con- centration in the waters of the Jiaozhou Bay.