Adsorption Kinetics of Pb￣（2+） and Cu￣（2+） on Variable Charge Soils and Minerals: Ⅶ. Kinetics of H￣+ Releasing after Ph￣（2+） adsorptionEnglish Full Text
HU GUO-SONG(Institute of Soil Science, Academia Sinica, P. O.Box 821, Nanjing 210008 China)
Abstract: The kinetics of H+ releasing after Pb（2+） adsorption was studied by the potentiometric method combined with the acid-base titration curve technique. Results showed that pH of latosol, red soil and kaolinite suspensions dropped sharply, and then decreased gradually. Most of the H+ exchanged, more than 60%, was displaced at the first minute after Pb（2+） was added into the suspension. More H+ was released at a higher concentration of Pb（2+） added for a given sample and the amount of H+ released decreased in the order of red soil ＞ latosol ＞ kaolinite at a given concentration. The time-dependent data of H+ releasing of latosol,red soil and kaolinite at two concentrations could be fitted best with the second-order equation among thesix equations, including second-order equation, two-constant equation, Elovich equation, parabolic diffusion equation, first-order equation and exponential equation. The H+/Pb（2+） exchange stoichiometry increased with time, and a stable ratio of H+/Pb（2+）, being 1.73, 1.92 and 2.01 for kaolinite, latosol and red soil,respectively, was reached 25 minutes later.
Keywords：
- Series：
(D) Agriculture
- Subject：
Fundamental Science of Agriculture; Agronomy
- Classification Code：
S153.6
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