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Pyrophosphate Hydrolysis in Flooded Soil
Author(s) -
Hossner L. R.,
Phillips D. P.
Publication year - 1971
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1971.03615995003500030018x
Subject(s) - pyrophosphate , hydrolysis , chemistry , moisture , water content , soil water , activation energy , incubation , nuclear chemistry , environmental chemistry , soil science , environmental science , geology , biochemistry , enzyme , organic chemistry , geotechnical engineering
Rate of hydrolysis of pyrophosphate, applied as (NH 4 ) 3 ‐HP 2 O 7 ·H 2 O, was measured in four soils under flooded and ⅓ atm moisture content. Hydrolysis was faster under flooded conditions than at ⅓ atm moisture. Pyrophosphate hydrolysis was determined to be a first‐order reaction under flooded conditions but not at ⅓ atm moisture content. The first‐order rate constants under flooded conditions ranged from 2.09 × 10 ‐5 min ‐1 to 1.43 × 10 ‐4 min ‐1 depending upon the soil and temperature of incubation. Half‐life values for applied pyrophosphate varied from 0.6 to 3.9 days. The activation energy for pyrophosphate hydrolysis under flooded soil conditions was calculated to be 4,500 cal/mole for a Katy sl soil.