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提出了把Kielland模型用于有机阴离子交换树脂研究二元酸根交换平衡的依据,用RHCO_3-CO_3~(2-)体系证明了Kielland方程可推广到Ⅰ-Ⅱ价交换平衡。用~(14)C标记技术求出了μ=0.30、t=25℃时混合交换平衡常数K_B~A=2.41,特征常数C=0.24。和RHSO_4-SO_4~(2-)交换体系对比,明确了选择性次序为:HSO_4~->SO_4~(2-)>>CO_3~(2-)>HCO_3~-,还对二元酸根在树脂内的转化作了讨论。
A Kielland model was proposed for the study of the exchange equilibrium of dibasic acid with organic anion exchange resin. It was proved by RHCO_3-CO_3 ~ (2-) system that the Kielland equation can be extended to the equilibrium of Ⅰ-Ⅱ valence exchange. Μ = 0.30 was determined by ~ (14) C labeling technique. The equilibrium constants K_B ~ A = 2.41 and characteristic constant C = 0.24 were obtained at t = 25 ℃. Compared with RHSO_4-SO_4 ~ (2-) exchange system, the order of selectivity was clear: HSO_4 ~ -> SO_4 ~ (2 -) >> CO_3 ~ (2 -)> HCO_3 ~ The transformation within is discussed.