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本文研究了长江河口水在不同站位的细颗粒泥沙存在下氨氮的降解动力过程，并从阳离子交换容量（ＣＥＣ）以及Ｚｅｔａ电位研究颗粒物的表面性质对氨氮降解的影响。结果表明，Ｚｅｔａ电位与颗粒物表面的凯氮以及氨氮有很好的相关性。而ＣＥＣ越大，颗粒物对硝化细菌的累积量也越大，有利于水体中氨氮的硝化降解作用。长江口南槽附近的颗粒物ＣＥＣ值高于河口上游，氨氮的降解速率最快。
In this paper, the degradation kinetics of ammonia nitrogen in Yangtze River Estuary under the condition of fine sediment at different stations was studied. The effects of particulate matter surface on the degradation of ammonia nitrogen were studied by cation exchange capacity (CEC) and Zeta potential. The results showed that the Zeta potential was in good correlation with the Ni (superscript 2 +) and ammonia nitrogen on the surface of the particles. The larger the CEC, the greater the accumulation of particulate matter on nitrifying bacteria, which is conducive to nitrification and degradation of ammonia nitrogen in water. The CEC value of the particulate matter near the south channel of the Changjiang Estuary is higher than that of the estuary, and the degradation rate of ammonia nitrogen is the fastest.