Abstract
By the method of potentiometric titration of a fibrous aminocarboxylic polyampholyte with a predominant content of carboxyl groups, the equilibrium of the cation exchange of calcium, magnesium, and potassium ions for a hydrogen ion was studied. Due to the low solubility of calcium and magnesium hydroxides in these cases, titration was carried out by Ca(OH)2 and Mg(OH)2, which are formed in solution upon contact with the H-form of the ion exchanger оf increasing portions of solid CaO and MgO. This made it possible to obtain titration curves in a wide range of pH and calcium and magnesium chlorides concentration (0–0.1 eq./L). The dependences of the swelling of ion exchangers on the neutralization degree with the bases of the studied cations are obtained. The coefficients of ion-exchange equilibria are calculated. It was found that the swelling of the ion exchanger is relatively little dependent on its ionic form. The ion exchanger has a higher affinity for calcium than magnesium ion.
Highlights
By the method of potentiometric titration of a fibrous aminocarboxylic polyampholyte with a predominant content of carboxyl groups, the equilibrium of the cation exchange of calcium, magnesium, and potassium ions for a hydrogen ion was studied
Due to the low solubility of calcium and magnesium hydroxides in these cases, titration was carried out by Ca(OH)2 and Mg(OH)2, which are formed in solution upon contact with the H-form of the ion exchanger оf increasing portions of solid CaO and MgO
It was found that the swelling of the ion exchanger is relatively little dependent on its ionic form
Summary
Институт физико-органической химии Национальной академии наук Беларуси, Минск, Беларусь. Методом потенциометрического титрования волокнистого аминокарбоксильного полиамфолита с преобладающим содержанием карбоксильных групп изучено равновесие катионного обмена ионов кальция, магния и калия на ион водорода. В связи с низкой растворимостью гидроксидов кальция и магния в этих случаях титрование проводилось Са(ОН) и Mg(ОН), образующихся в растворе, контактирующим с Н-формой ионита, при добавлении в нее возрастающих порций твердых СaO и МgО. Это позволило получить кривые титрования в широком интервале рН и концентраций хлоридов кальция и магния (0–0,1 экв/л). Ионит имеет более высокое сродство к иону кальция, чем магния. Ключевые слова: волокнистый карбоксильный ионит, потенциометрическое титрование, твердые титранты, ионный обмен кальция и магния. С. Равновесия ионного обмена кальция, магния и калия на протон на волокнистом карбоксильном ионите / В. EQUILIBRIUM OF ION EXCHANGE OF CALCIUM, MAGNESIUM AND POTASSIUM FOR PROTON ON FIBROUS CARBOXYLIC ION EXCHANGER
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