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本文通过１９８６年和１９９０年现场测试资料研究了长江口区悬浮颗粒的表面性质（ＣＥＣ、ＳＳＡ、Ｚｅｔａ电位）和组分（Ｃ、Ｎ、Ｐ、Ａｌ、Ｆｅ及其水合氧化物）的变化特征，结合前文（Ⅰ·悬浮颗粒絮凝沉降特征）所阐明该区絮凝聚沉状态和若干参数的特征变化，从中发现它们的密切对应关系，揭示了长江口区絮凝聚沉状态和体系稳定性变化的物理化学机制，证明颗粒表面组分与表面性质的变化是絮凝聚沉的本质因素。为长江口区絮凝聚沉的深入研究和综合整治提供重要的科学基础。
In this paper, the characteristics of surface (CEC, SSA, Zeta potential) and components (C, N, P, Al, Fe and their hydrous oxides) of suspended particles in the Yangtze River Estuary were studied through field test data in 1986 and 1990 , The characteristics of the flocculation and sedimentation state and some parameters in this area are elucidated in the light of the characteristics of the flocculation and sedimentation of the suspended particles (Ⅰ). The close correspondences between them are revealed and the flocculation and sedimentation state and the stability of the system in the Yangtze River Estuary are revealed Physical and chemical mechanisms to prove that changes in particle surface composition and surface properties of flocculation is the essence of coagulation factors. It provides an important scientific basis for further research and comprehensive improvement of flocculation and sedimentation in the Yangtze River Estuary.