Regional Centre, CSIR-National Institute of Oceanography, Mumbai, India.
Regional Centre, CSIR-National Institute of Oceanography, Mumbai, India.
Mar Pollut Bull. 2018 Apr;129(2):645-654. doi: 10.1016/j.marpolbul.2017.10.052. Epub 2017 Oct 27.
The purpose of the present study is to investigate the behaviour of trace metals in anoxic environment. Water column of the harbour was found to be anoxic (DO <0.2mgl) with high concentration of NH-N (av. 459±21μmoll) and HS (av.73±2.5μmoll) irrespective of season and tide. High concentrations of Fe, Mn in bottom water indicated that Fe, Mn were diagenetically mobilized under the anoxic conditions prevailing in the harbour. In harbour sediments significant correlation of metals with TOC and TS indicated their diagenetic immobilization in anoxic environment. Fe was positively correlated with TS suggesting FeS formation in anoxic condition. TOC/TN ratio of sediments was higher (16±5.2) than the normal marine planktonic sediments suggesting an increased burden of terrestrial carbon in the harbour. A sediment core collected 10km away from the shore indicated build-up of trace metals in recent years, showing diagenetically upward movement of metals.
本研究的目的是研究痕量金属在缺氧环境中的行为。无论季节和潮汐如何，港口的水柱都是缺氧的（DO <0.2mgl），具有高浓度的 NH-N（平均 459±21μmoll）和 HS（平均 73±2.5μmoll）。底部水中高浓度的 Fe、Mn 表明，在港口普遍存在的缺氧条件下，Fe、Mn 发生了成岩迁移。在港口沉积物中，金属与 TOC 和 TS 的显著相关性表明它们在缺氧环境中被成岩固定。Fe 与 TS 呈正相关，表明在缺氧条件下形成了 FeS。沉积物的 TOC/TN 比值（16±5.2）高于正常海洋浮游沉积物，表明港口陆源碳的负担增加。从岸边采集的一个 10 公里远的沉积物岩芯显示，近年来痕量金属的积累，表明金属向上成岩迁移。
