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本文利用K+选择电极来研究蛋白质模型化合物聚乙二醇(PEG)在水溶液中对K+的吸附行为。实验表明:在本体系中K+并不完全以游离状态存在,部分K+呈吸附缔合状态,并随实验条件而变化。PEG对K+的吸附同冠醚相似,基本上以8~11个醚氧吸附缔合一个K+。当PEG分子量较大时,由于受到空间位阻或形成“冠醚”串时连接部分的需要,相对平均就要11个醚氧才能吸附缔合一个K+。同时K+与H+间存在着竞争吸附平衡。
In this paper, K + selective electrode was used to study the adsorption of K + on polyethylene glycol (PEG) as a model protein in aqueous solution. Experiments show that: K + is not completely free state in the system, some K + adsorption associated state, and with the experimental conditions and changes. Adsorption of K + by PEG is similar to that of crown ethers, and a K + is essentially adsorbed by 8 to 11 ether oxygens. When the molecular weight of PEG is larger, on average, 11 ether oxygens will be required to adsorb and associate a K + due to the steric hindrance or the need for the tethered portion of the “crown ether” string. At the same time there is competitive adsorption equilibrium between K + and H +.