辽东湾北部浅海沉积物铅污染分析

Analysis of Lead Pollution in Shallow Sea Sediments in Northern Liaodong Bay

辽东湾北部浅海区397件样品中铅元素的测试数据显示,其浅海沉积物铅主要以残渣态、铁锰氧化态和碳酸盐结合态存在,具有西高东低的分布特点,异常突出并且集中分布于锦州湾西南部。调查区铅的存在形态主要为残渣态、铁锰氧化态和碳酸盐结合态,其次是腐殖酸结合态、强有机结合态,离子交换态和水溶态铅含量很少。沉积物样品铅全量与铅的碳酸盐结合态、腐殖酸结合态、铁锰氧化态存在极显著的正相关,碳酸盐结合态、腐殖酸结合态和铁锰氧化态含量是决定铅全量的主要因素。铅的碳酸盐结合态、腐殖酸结合态、铁锰氧化态分布特征与全量铅分布特征一致。因此,辽东湾北部浅海区铅污染主要为锌厂排污及其他工业生产的污水、烟尘所致。

The test data of lead elements in 397 samples from the northern shallow sea area of Liaodong Bay show that the lead in the shallow sea sediments mainly exists in the residual state, iron-manganese oxidation state and carbonate combination state with has the characteristics of high in the West and low in the east, and is prominent and concentrated in the southwest part of Jinzhou Bay. The main forms of lead in the investigation area are residue, iron-manganese oxidized and carbonate-bound, followed by humic acid-bound and strong organic-bound, with little ion exchange and water-soluble lead content. The total amount of lead in sediment samples is positively correlated with the carbonate-bound state, humic acid-bound state and iron-manganese oxidized state of lead. Carbonate-bound state, humic acid-bound state and iron-manganese oxidized state are the main factors determining the total amount of lead. The distribution characteristics of carbonate-bound state, humic acid-bound state and iron-manganese oxidation state of lead are consistent with those of total lead. Therefore, Lead pollution in the shallow sea area of northern Liaodong Bay is mainly caused by zinc plant sewage and other industrial sewage and smoke.