Colloid stability and aggregation in estuaries: 1. Aggregation kinetics of riverine dissolved iron after mixing with seawater
Colloid stability and aggregation in estuaries: 1. Aggregation kinetics of riverine dissolved iron after mixing with seawater
复制标题
河口胶体稳定性和聚集：1.河流溶解铁与海水混合后的聚集动力学
DOI：
10.1016/0016-7037(88)90266-9
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发表时间：
1988
影响因子：
5
通讯作者：
Margaret Leonard
中科院分区：
文献类型：
--
作者：
K. Hunter;Margaret Leonard
用新西兰两条河流的样品研究了河水溶解铁胶体在海水中的聚集动力学，结果表明，动力学数据不能很好地用以前研究中发现的二级速率定律描述。一个显着的分数的溶解铁聚集后，立即加入海水，以这种方式聚集的分数随着盐度的增加而增加。在加盐前将河水储存8-48小时，可以显著降低加盐后铁的聚集分数。随着用于分离溶解铁和颗粒铁的过滤器的孔径的增加，聚集的速率和程度降低。当预先存在的颗粒已经大于标称孔径的过滤器被删除之前，添加盐，显示大颗粒是必不可少的聚集mechanism.A粒子碰撞的统计模型已经开发，解释了这种依赖性的聚集速率的存在下，大颗粒和过滤器的孔径。
The kinetics of aggregation of riverine dissolved Fe colloids upon addition of seawater have been studied using samples from two New Zealand rivers.Results show that the kinetic data are not well-described by a second-order rate law as found in previous studies. A significant fraction of the dissolved Fe was aggregated immediately upon the addition of seawater, with the fraction aggregated in this way increasing as the salinity was increased. Storage of river water before salt addition for 8–48 hr was found to markedly decrease the fraction of Fe aggregated upon salt addition. The rate and extent of aggregation decreased as the pore size of the filters used to separate dissolved and particulate iron was increased. The rate and extent of aggregation were markedly decreased when pre-existing particles already larger than the nominal pore size of the filters were removed before addition of salt, showing that large particles are essential to the aggregation mechanism.A statistical model of particle collisions has been developed that explains this dependence of aggregation rate on the presence of large particles and on the pore size of the filter.