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1994—1995年期间，利用β计数法实测了南沙群岛海域、南海东北部海域、厦门湾塔角附近海域和九龙江河口区共计116份海水样品中溶解态与颗粒态234Th的放射性比活度。结果表明，颗粒态234Th占总34Th的份额大小顺序为：九龙江河口区＞厦门海塔角附近海域＞南沙海域。南海东北部海域。234Th的条件分配系数Kd介于1．1×104—20×106dm3／kg之间，平均为2．2×105dm3／kdKd与总悬浮颗粒物含量（7SAN呈负相关关系：lg（Kd）＝－0．59·lg（TSM）＋5．67，这一“颗粒物浓度效应”可归因于海洋胶体物质的存在。由上述关系获得4个研究海区胶体浓度与悬浮颗粒物浓度的函数关系：Cc＝f（TSM0．59）。
During 1994-1995, the radioactive specific activity of dissolved and particulate 234Th in 116 samples of seawater from the Nansha Islands, the northeastern South China Sea, the waters around the towering angle of Xiamen Bay and the Jiulongjiang estuary was measured by β counting method. . The results showed that the share of 234Th particles in total 34Th was in the order of Jiulongjiang estuary> sea area around Xiamen Haita> Nansha sea. South China Sea in the northeast. The conditional partition coefficient Kd of 234Th ranged from 1.1 × 104-20 × 106dm3 / kg with an average of 2.2 × 105dm3 / kdKd and the total suspended particulate matter content (7SAN was negatively correlated: lg (Kd) = -0 .59 · lg (TSM) +5.67, which is attributed to the existence of marine colloids. From the above relationships, the relationship between colloidal concentration and suspended particulate concentration in the four studied sea areas is obtained as follows: Cc = f ( TSM0.59).