Edward J. Griffith

Bio: Edward J. Griffith is an academic researcher. The author has contributed to research in topics: Refractometry & Salt (chemistry). The author has an hindex of 8, co-authored 10 publications receiving 325 citations.

Removal and Recovery of Phosphate From Water Using Sorption

Abstract: Sorption is an effective, reliable, and environmentally friendly treatment process for the removal of phosphorus from wastewater sources which otherwise can cause eutrophication of receiving waters. Phosphorus in wastewater, if economically recovered, can partly overcome the future scarcity of phosphorus resulting from exhaustion of natural phosphate rock reserves. The authors present a comprehensive and critical review of the literature on the effectiveness of a number of sorbents, especially some novel ones that have recently emerged, in removing and recovering phosphate. Mechanisms and thermodynamics of sorption, as well as regeneration of sorbents for reuse using acids, bases, and salts, are critically examined.

Phosphate glass dissolution in aqueous solutions

Abstract: Rates of aqueous dissolution are reported for a series of phosphate glasses having the composition (50 − X)M2O·(X)CaO·50P2O5. Dissolution reactions involving the consumption of H+ and OH− were monitored using pH stat titration techniques, solution analyses using inductively coupled plasma emission, and depth profiling of corroded glass surfaces for H and other elements using elastic recoil detection analysis and Rutherford backscattering. These analytical results indicate that the phosphate glasses dissolve uniformly due to acid- or base-catalyzed hydration of the polymeric phosphate network. The rate and nature of this hydration appears to be controlled by the surface pH and/or charge which develops at the glass/ solution interface. The implication of these results on dissolution models for both the phosphate and silicate glasses is discussed.

Mechanisms of signaling and related enzymes

Abstract: Most enzymes involved in cell signaling, such as protein kinases, protein phosphatases, GTPases, and nucleotide cyclases catalyze nucleophilic substitutions at phosphorus When possible, the mechanisms of such enzymes are most clearly described quantitatively in terms of how associative or dissociative they are The mechanisms of cell signaling enzymes range from or = 10(5), general acid catalysis (approximately 10(3 +/- 1)), general base catalysis (approximately 10(3 +/- 1)), and transition-state stabilization by cationic and hydrogen bond donating residues (approximately 10(3 +/- 1))