利用切向超滤技术对大亚湾纳米粒子 (0 .4 5μm～ 10 3 Daltons)进行了有效分离 ,并计算其回收率。测定了大亚湾胶体态和溶解态 (<10 3 Daltons)痕量金属 (Cu、Pb和 Cd)的含量。平均来说 ,14% Cu、2 0 % Pb和 2 4 % Cd实际上与胶体物质密切相关 ,说明胶体物质在这些金属的迁移和转换过程中具有重要作用 The effective separation of Daya Bay nanoparticles (0. 45μm ~ 103 Daltons) was achieved by tangential ultrafiltration and its recovery was calculated. The contents of trace metals (Cu, Pb and Cd) in colloidal and dissolved (<10 3 Daltons) in Daya Bay were measured. On average, 14% Cu, 20% Pb and 24% Cd are in fact closely related to the colloids, indicating that colloidal substances play an important role in the migration and conversion of these metals