A new type of isotherm for zinc liquid-solid partitioning on δ?MnO2, γ?MnOOH and manganite in seawater |
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| Authors: | Pan Gang Zhang Zhengbin Liu Liansheng |
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| Institution: | (1) Shandong College of Oceanology, Qingdao |
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| Abstract: | This article deals with the interaction of zinc with δ−MnO2, γ−MnOOH and manganite existing in natural water systems. The mechanism of the reaction has been studied in detail. From
the fact that the “ratio of ion exchange(%)-pH” graph is an “S shaped” curve, it is possible to deduce that the chemical reaction
is of the nature of cation exchange. And since the pH range of ion exchange=4, it is possible to further deduce that the reaction
can be explained by the mechanism of monovalence cation exchange.
The main result of this article is the discovery of a new type of isotherm which has not been mentioned in previous literature
here and abroad. This isotherm cannot be represented by any presently available adsorption isotherm equations in marine chemistry.
The characteristics of this new type of isotherm are as follows: the isotherm has two “knees” and three “plateaus”, the heights
of these three “plateaus” are in the ratio 1:2:3. In order to explain theoretically our new isotherm, this article suggests
the application of the principle of interfacial stepwise ion exchange for liquid-solid distribution of minor elements on suspended
particulate matter. The corresponding isotherm equation was derived from this theory.
The results obtained in this article will be of theoretical guiding significance in the study of the marine geochemistry of
zinc.
Projects supported by the Science Fund of the Chinese Academy of Sciences. |
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