Abstract
Studies were undertaken on the isolation and identification of reaction products of triammonium pyrophosphate (TPP), the major non-orthophosphate constituent of ammonium polyphosphate newly introduced in India, in representative soils of the alfisol, oxisol, entisol, mollisol and vertisol groups of India. Saturated solution of TPP were reacted with soils for periods of 30 minutes and one day with corresponding precipitation times of 15 days, three months and one year to isolate reaction products which were identified by X-ray diffraction technique, infra-red spectroscopy and chemical analyses. Six reaction products, namely, Ca(NH4)2P2O7 · H2O, Mg(NH4)2P2O7 · 4H2O, Ca(NH4)4H2(P2O7)2, Ca3(NH4)4H6(P2O7)4·3H2O, FeNH4P2O7 and NH4Al0·33 Fe0·67P2O7 were identified in different soils; Ca(NH4)2P2O7·H2O and Mg(NH4)2P2O7 · 4H2O occurring in abundance in most soils. Significant hydrolytic degradation of pyrophosphate reaction products to orthophosphate was not observed.
Complementary studies where TPP in solid form was applied to soil, and reaction formed at and around the site of TPP placement were identified after six weeks incubation also showed the formation of Ca(NH4)2P2O7 · H2O and Mg(NH4)2P2O7 · 4H2O in the soils examined.
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Yadav, V., Mistry, K. Reaction products of triammonium pyrophosphate in different Indian soils. Fertilizer Research 5, 423–434 (1984). https://doi.org/10.1007/BF01049122
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DOI: https://doi.org/10.1007/BF01049122