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1 Polish Journal of Chemical Technology

1 2000

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Stability of pyro - and tripolyphosphate complexes with micronutrients and liquid fertilizers

Grzmil B., Kic B.

Polish Journal of Chemical Technology

2000

Vol. 2, nr 1

5-9

The conditional stability constants of tripolyphosphate, pyrophosphate and the citrate complexes with respectively Zn2+, Mn2+, Co2+, Cu2+, Fe2+ as a function of pH range (4.5 - 7.5) and the ionic strength of solution (0.1 - 3.0 mol/dm3) have been determined. It was found that the studied complexes at pH values of 6 and 7.5 have higher conditional stability constants than those complexes at pH value of 4.5. Higher conditional stability constants possessed complexes in a solution containing two different ligands - tripolyphosphate and citrate in comparison with pure tripolyphosphates and citrates. The possibilities of production of liquid fertilizers NPKMg with micronutrients (Zn, Cu, Co, Mo, B, Mn, Fe) stable during storage period have been determined. The solutions of tripolyphosphates with pH value of 4.5 - 7.5 and solution of citrates with pH values of 4.5 and 6.0 were stable over an extended time period. Whereas the precipitate was formed from solutions in which complexing ligand was pyrophosphate for the studied range of pH, and at pH 7.5 in the case of citrate.