摘要
实验研究海水中天然溶解有机物（ＤＯＭ）在δ－ＭｎＯ２、粘土和二氧化硅上的吸附，海水中溶解有机碳（ＤＯＣ）在δ－ＭｎＯ２、高岭石、伊利石和二氧化硅上的吸附率随ｐＨ的增加而减小。结果表明，在天然海水ｐＨ８．１条件下，海水中天然溶解有机物在这４种固体粒子上的吸附率大小为：δ－ＭｎＯ２（３２％）＞伊利石（１４％）＞高岭石（４％）≈二氧化硅（３％）。根据统计热力学方法得到的公式能够很好地拟合海水中ＤＯＭ在固体颗粒物上的吸附。
The adsorption of natural dissolved organic matter on δ-MnO 2,soils and SiO 2 in seawater were investigated. The adsorption ratio of natural dissolved organic carbon on δ-MnO 2, soils and SiO 2 decreased with increasing pH. The sequence of adsorption ratio of natural dissolved organic matter on the solid particles at the pH of natural seawater (pH8.1) is:δ-MnO 2(32%)>illite(14%)>kaolinite(4%)≈SiO 2(3%).The equations which consider the surface interactions in terms of statistical thermodynamics were obtained and the adsorption of DOM on solid particles was described.
基金
国家自然科学基金
关键词
海水
溶解有机物
固体颗粒
吸附
拟合参数
seawater
dissolved organic matter
solid particles
adsorption
fitting parameters
