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用1M的氢氧化钠滴定置于1M氯化钠溶液中的Duolite C467水合氢离子型氨基膦酸螫合离子交换树脂,反映出了这种交换剂的双质子性质。在pH值为9.3以及大约为6.1时,检测出两个转折点。根据第2个转折点计算出每克干基水合氢离子型树脂的交换量为4.80毫克当量。每克树脂对钠离子的吸附量超过其交换量2.6毫克当量之多,这或许是氯化钠电解质吸附造成的。在50%～9O%钠离子的转化范围中,少量酸性水合氢离子对钠离子的交换给出了一恒定的校正选择系数(K_H)值—6.5(logK_H)。在10%～50%的钠离子转化范围内,相应酸性较强的水合氢离子交换的选择系数为—4～—5。在氯化钠溶液中,钠型树脂的水解实质上没有将树脂转化为水合氢离子型,但是明显地提高了溶液的pH值。
Titration of Duolite C467 hydronium ionophosphonic acid ion exchange resin in 1 M sodium chloride solution with 1 M sodium hydroxide reflects the biprotective nature of this exchanger. At a pH of 9.3 and approximately 6.1, two inflection points were detected. Based on the second turning point, an exchange amount of 4.80 milliequivalents per gram of dry-radical hydrated hydrogen-type resin was calculated. The amount of sodium ions adsorbed per gram of resin exceeds its equivalent of 2.6 milliequivalents of exchange, perhaps as a result of sodium chloride electrolyte adsorption. In the conversion range of 50% ~ 90% sodium ions, a small amount of acidic hydronium ions exchange with sodium ion gives a constant correction coefficient of choice (K_H) of -6.5 (log K_H). In the range of 10% ~ 50% sodium ion conversion, the corresponding acidic hydronium ion exchange coefficient is -4 ~ -5. In sodium chloride solution, the hydrolysis of the sodium type resin does not substantially convert the resin to the hydronium ion type, but significantly increases the pH of the solution.