中国多金属结核开辟区间隙水中铜、锰、镍的分布规律

Distribution of Cu, Mn and Ni in the porewater of sediment in China Pioneer Area, northeast Pacific

通过对东北太平洋海域中国多金属结核开辟区沉积物间隙水中铜、锰、镍等微量元素的详细研究表明,锰主要受沉积环境的影响,其含量的变化范围在0.16～8.61μg/dm^3之间;铜和镍则主要与表层海水的初级生产力有关,研究区内间隙水中铜和镍含量的变化范围分别为0.16～20.8和0.80～3.12μg/dm^3,且这些元素在沉积物—水界面处均存在最大浓度梯度.利用“Fick扩散定律”计算表明,锰在研究区主要是从上覆海水向沉积物扩散,是沉积物中锰的主要来源之一;而铜和镍则是从沉积物向上覆海水扩散,是底层海水中铜和镍的主要来源。与表层海水中铜和镍向底层海水的输送通量计算结果相比,底层海水中铜和镍的含量主要受沉积物的控制.

Porewater samples from China Pioneer Area have been analyzed for manganese, copper and nickel. The results show that the Mn is markedly affected by sediment environment, and its content varied between 0.16 and 8.61μg/dm . However, Copper and Ni are related to the primary production in surface seawater. The contents of Cu and Ni in porewater are 0.16 - 20.8μg/dm3 and 0.80 - 3.12μg/dm3 respectively. All of these elements show a pronounced maximum concentration gradients just at the sediment/water interface. Based on calculation using the Ficks first law modified for sediment, the Mn flux is mainly from overlying water to sediment, and is the main source of Mn in sediment. But the Cu and Ni fluxes are from sediment to overlying water. Comparing with the Cu and Ni fluxes from surface water to bottom water, the contents of Cu and Ni in bottom water are mainly controlled by sediments.