自然水体生物膜吸附Mn2+过程中吸附液pH值的变化

利用自然水体培养的生物膜进行了微量矿物盐溶液、 ddH₂O体系的Mn2+的吸附实验， 并用无Mn²⁺的微量矿物盐溶液、 ddH₂O作对比， 研究自然水体生物膜吸附Mn²⁺过程中吸附液pH值的变化. 结果表明， 在吸附过程中， 4种吸附液的pH值都是先升后降至稳定， 微量矿物盐体系的p H值高于相应的ddH₂O体系的pH值， 无Mn²⁺吸附液的pH 值高于有Mn²⁺的吸附液的pH值， 且可用氧化物表面吸附的配合模式描述自然水体生物膜吸附Mn²⁺过 程中吸附液pH值的变化.

Changes of Solution pH During Mn2+ Adsorption to the Natural Surface Coatings

Adsorption of Mn²⁺ to natural surface coat ings developed in the South Lake was carried out for the purpose of investigatin g pH changes of different systematic solutions, which were prepared by minimal m ineral salts (MMS) and distilled-deionized water (dd water) with Mn²⁺ present and absent, respectively. The results show that the pH values of the four solutions employed increased remarkably during the initial adsorption perio d first, subsequently decreased to a stationary value gradually. In addition, the pH values of MMS solutions were higher than those of dd water solutions without MMS accordingly, and solutions without Mn²⁺ higher than those of solutions with Mn²⁺ presen t. The variety of pH in the study could be described by an oxide surface adsorp tion conjugate model.