SALT EFFECTS ON THE PROTONATION OF ORTHO-PHOSPHATE BETWEEN 10-DEGREES-C AND 50-DEGREES-C IN AQUEOUS-SOLUTION - A COMPLEX-FORMATION MODEL

被引：64

作者：

DANIELE, PG

DEROBERTIS, A

DESTEFANO, C

GIANGUZZA, A

SAMMARTANO, S

机构：

[1] UNIV MESSINA,INST CHIM ANALIT,I-98166 MESSINA,ITALY

[2] UNIV PALERMO,DIPARTIMENTO CHIM INORGAN,I-90123 PALERMO,ITALY

来源：

JOURNAL OF SOLUTION CHEMISTRY | 1991年 / 20卷 / 05期

关键词：

ORTHO-PHOSPHORIC ACID; PROTONATION CONSTANTS; SALT EFFECTS; WEAK COMPLEXES; NA+ AND K+ HOMOBINUCLEAR AND HETEROBINUCLEAR COMPLEXES; THERMODYNAMIC PARAMETERS; AQUEOUS SOLUTIONS; NATURAL FLUIDS;

D O I：

10.1007/BF00650805

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Protonation constants of o-phosphate were studied potentiometrically, using the (H+)-glass electrode in aqueous NaCl, KCl and tetraethylammonium iodide solutions, at 0 less-than-or-equal-to I less-than-or-equal-to 1M and 10 less-than-or-equal-to T less-than-or-equal-to 50-degrees-C. The differences found in the protonation constants for different salt solutions are explained by a complex formation model. The formation of the species MPO4(2-), MHPO4-, MH2PO4(0), M2PO4- and M2HPO4(0) (M = Na+, K+) is hypothesized. In mixed NaCl-KCl solutions, it is possible to find the mixed metal species NaKPO4- and NaKHPO4(0). Ionic strength and temperature dependence parameters are reported for all species. The relevance of Na+ and K+ complexes is discussed in connection with speciation problems of natural fluids, such as marine water and urine.

引用

页码：495 / 515

页数：21

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