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本文研究了海水中存在氨基酸、腐植质等有机物时,对铜、铅、锌、锅和粘土矿物相互作用的离子交换率(％)-pH关系的“S型曲线”的影响。主要结果为:(1)随加入有机物量的增加,S型曲线先左后右地移动,其中△pH_(sh(L))与log(OB_m)呈直线关系。(2)在一定量有机物存在时对二价重金属,△pH_(sh(L))大小顺序为:Cu>Pb>Zn>Cd,△pH_(sh(L))与logK_(OA)呈直线关系。(3)对不同氨基酸存在时,铜-伊利石相互作用S型曲线的△pH_(sh(L)),与铜和这些氨基酸的logK_(OA),呈直线关系。(4)对上述实验现象提出定量解释,即遵循下述公式:(5)对S型曲线左右摆动现象从反应机理角度作了讨论。
This paper studies the effect of the “S-curve” on the ion exchange rate (%) - pH relationship of Cu, Pb, Zn, pot and clay minerals in the presence of organic acids such as amino acids and humus in seawater. The main results are as follows: (1) With the increase of the amount of organic matter added, the S curve moves left and right firstly, and there is a linear relationship between △ pH_ (sh (L)) and log (OB_m) (2) The order of the △ pH_ (sh (L)) to divalent heavy metals in the presence of a certain amount of organic matter was linear relationship with log K_ (OA) for Cu> Pb> Zn> Cd, . (3) For different amino acids, △ pH_ (sh (L)) of copper-illite interaction S-curve was linear with the log K_ (OA) of copper and these amino acids. (4) The quantitative interpretation of the above experimental phenomena, that follow the following formula: (5) S-shaped curve on the left and right swing phenomenon from the reaction mechanism point of view are discussed.