Articles & Issues
- Language
- English
- Conflict of Interest
- In relation to this article, we declare that there is no conflict of interest.
-
This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright © KIChE. All rights reserved.
All issues
A STUDY ON PYROPHOSPHATO COMPLEXES WITH FERTILIZER TRACE ELEMENTS
Korean Journal of Chemical Engineering, January 1989, 6(1),
10.1007/BF02698104
10.1007/BF02698104
Download PDF
Abstract
To evaluate the capability of pyrophosphate ion as a carrier of fertilizer trace elements, pyrophosphato complexes with manganous, cupric, ferrous and zinc ions were studied by spectrophotometry and polarography.
The soluble complexes of Mn2+, Cu2+, Fe2+ and Zn2+ with pyrophosphate ion appeared to be [Mn(HxP2O7)2](6-2x)-, [Cu(HxP2O7)2](6-2x)-, [Fe(HxP2O7)2](6-2x)- and [ZnHxP2O7](2-x)-, and the logarithmic values of their stability constants were measured to be 1.79, 3.45, 5.08 and 6.43 at pH 10, respectively.
However, by adding excess corresponding metal ion, the soluble pyrophosphato complexes were ultimately changed to amorphous precipitates.
The soluble complexes of Mn2+, Cu2+, Fe2+ and Zn2+ with pyrophosphate ion appeared to be [Mn(HxP2O7)2](6-2x)-, [Cu(HxP2O7)2](6-2x)-, [Fe(HxP2O7)2](6-2x)- and [ZnHxP2O7](2-x)-, and the logarithmic values of their stability constants were measured to be 1.79, 3.45, 5.08 and 6.43 at pH 10, respectively.
However, by adding excess corresponding metal ion, the soluble pyrophosphato complexes were ultimately changed to amorphous precipitates.
