Formation equilibria of tin(II) orthophosphate complexes

被引：4
|
作者：
Ciavatta, L
Iuliano, M
机构：
[1] Univ Naples Federico II, Dipartimento Chim, I-80126 Naples, Italy
[2] Univ Naples 2, Dipartimento Sci Ambientali, I-81100 Caserta, Italy
来源：
POLYHEDRON | 2000年 / 19卷 / 24-25期
关键词：
tin(II); phosphato complexes; solution equilibria; speciation;
D O I：
10.1016/S0277-5387(00)00538-6
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The complexation equilibria of Sn2+ ion with orthophosphate ions have been studied, at 25 degreesC in 3 M NaClO4 ionic medium. by potentiometric titrations with Sn2+/Sn-Hg and glass electrodes. The concentrations of the metal and of the ligand ranged from 2.5 x 10(-4) to 2.5 x 10(-3) M and from 0.01 to 0.3 M, respectively. The hydrogen ion concentration varied between 0.1 and 10(-5.8) M. The potentiometric data are consistent with the formation of the complexes: SnH2PO4+, Sn(H2PO4)(2)(aq), SnH2PO4HPO4-, SnHPO4(aq), Sn(HPO4)(2)(2-), Sn(HPO4)(3)(4-) and SnPO4-. Stability constants for their formation in 3 M NaClO4 and in dilute solution are reported. (C) 2000 Elsevier Science B.V. All rights reserved.
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收藏
页码：2403 / 2407
页数：5
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