Source identification of heavy metals was the precondition of preventing and controlling pollution.
对土壤重金属污染物来源的鉴别是准确、有效控制和治理污染源的前提。
Manufactures, sellers, importers and users of products shall, in accordance with law, be responsible for preventing and controlling pollution by solid waste generated by the products.
产品的生产者、销售者、进口者、使用者对其产生的固体废物依法承担污染防治责任。
And it will be rather meaningful for oceanic pollution preventing and supervising to grasping and controlling the amount of COD in seawater in time.
及时掌握和控制海水中的COD值，对于海洋的污染防治及监测具有极为重要的意义。
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