Hydrolysis and adsorption-desorption reaction of pyrophosphate (PP) and orthophosphate (OP) were studied in two Quebec soils (St. Bernard and Dalhousie) and three minerals (goethite, kaolinite, and montmorillonite). Soil and soil mineral samples were fractionated by size into two separates. / Soil and goethite samples adsorbed more OP than PP whereas kaolinite and montmorillonite adsorbed similar amounts of OP and PP. Pyrophosphate and orthophosphate adsorption was found to be related significantly to extractable Fe. Furthermore, kaolinite and montmorillonite desorbed similar amounts of OP and PP whereas more OP than PP was desorbed from soil and goethite samples. Moreover, adsorption of OP and PP was found to be mainly chemical adsorption. Smaller particle size induced higher P adsorption and desorption from both P sources compared with the coarse particle size. / Goethite samples had slower rates of hydrolysis compared to soil and clay mineral samples. Furthermore, kalolinite and montmorillonite did not increase the rate of PP hydrolysis even with reduced adsorption of PP compared to soil and goethite samples. Chemical hydrolysis was found to be a significant portion of the total hydrolysis. Smaller particle size and high PP adsorption induced smaller PP hydrolysis than with coarse particles. Moreover, added OP reduced the amount of PP remaining nonhydrolyzed. First-order rates of PP hydrolysis were faster in nonautoclaved than autoclaved samples. Rate of PP hydrolysis increased with increased temperature and the effect of temperature was more obvious in the autoclaved than nonautoclaved samples.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.72013 |
| Date | January 1984 |
| Creators | Al-Kanani, Thamir Sadoon H., 1951- |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Doctor of Philosophy (Department of Renewable Resources.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 000222037, proquestno: AAINL20877, Theses scanned by UMI/ProQuest. |
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