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河口是化学环境和化学物质急剧变化的地区,是迁移到海洋中去的河流物质的控制中心。珠江是我国第三大河流,由东江、西江和北江三大支流汇合而成,流域面积广大,沿途排入大量的化学物质。这些化学物质是怎样经由珠江口而迁移到海洋中去的?在珠江口的分布如何?对珠江口的影响如何?等等,既是一个理论研究问题,也是一个实际问题。 Cu、Pb、Zn是目前世界上研究较多的海洋微量化学成分。这些元素含量大时,是海洋污染物质。且这些元素的化合物不易分解,还能通过海洋生物的富集,变成更有害的物质。在珠江口海区,这三种元素的含量也较大。据污染调查,每年排入珠江口流域的铜约二、三千吨,铅约上万吨,锌有一万多吨。
Estuary is a rapidly changing chemical environment and chemical substances in the region, is to move into the ocean to the river material control center. The Pearl River is the third largest river in China. It consists of three major tributaries of the East River, the Xijiang River and the Beijiang River. The Pearl River is large in area and emits a large amount of chemical substances along the route. How these chemicals migrated to the oceans through the Pearl River Estuary, how are they distributed in the Pearl River Mouth, how is it going to affect the Pearl River Mouth, and so on are not only a theoretical study but also a practical one. Cu, Pb, Zn are the most studied marine trace chemicals in the world. When these elements are high, they are marine pollutants. The compounds of these elements are not easily decomposed and can become more harmful substances through the enrichment of marine organisms. In the Pearl River Estuary, the content of these three elements is also larger. According to the investigation of pollution, about two to three thousand tons of copper are discharged into the Pearl River Estuary every year, about 10,000 tons of lead and over 10,000 tons of zinc.