UMR 5119 ECOLAG (IRD), Centre IRD de Nouméa, BP A5, 98848 Nouméa cedex, New Caledonia.
Mar Pollut Bull. 2009 Dec;58(12):1874-9. doi: 10.1016/j.marpolbul.2009.07.017. Epub 2009 Aug 13.
Seawater samples were collected in the lagoon of Nouméa (New Caledonia) along two transects from coastal bays to the oligotrophic barrier reef. Dissolved (<0.2 microm) and sub-micrometer (0.2-0.8 microm) concentrations of chromium, nickel and zinc were measured. Concentrations in the 0.2-0.8 microm size range were correlated with transparent exopolymeric particles (TEP) turnover rates, suggesting that a TEP pool rapidly cycling in the system is more reactive toward metals. The role of TEP reactivity in the transfer efficiency of metals from dissolved to particulate phases was estimated through variations of the metal partitioning coefficient K between sub-micrometer TEP and solution, as a function of the water mass residence time. The log K (6.0-8.0) increased from high to low residence time, suggesting that TEP reactivity increases when water masses renew rapidly. This suggests that hydrodynamics control TEP reactivity toward metals. The characteristics (adsorption vs. complexation) of TEP-metal association are discussed.
在新喀里多尼亚努美阿泻湖，沿两条从沿海湾到贫营养障壁礁的横断，采集海水样本。测量溶解的（<0.2 微米）和亚微米（0.2-0.8 微米）浓度的铬、镍和锌。0.2-0.8 微米大小范围内的浓度与透明的胞外聚合物颗粒（TEP）周转率相关，表明系统中快速循环的 TEP 池对金属更具反应性。通过亚微米 TEP 和溶液之间的金属分配系数 K 的变化，作为水体停留时间的函数，来估计 TEP 反应性在金属从溶解相转移到颗粒相的传递效率中的作用。log K（6.0-8.0）随停留时间从高到低而增加，表明当水体迅速更新时，TEP 反应性增加。这表明水动力控制 TEP 对金属的反应性。讨论了 TEP-金属结合的特征（吸附与络合）。
