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Boron Release and Sorption by Fly Ash as Affected by pH and Particle Size

Inst. of Soils and Water, The Agric. Res. Organization, The Volcani Center, P.O.B. 6, Bet Dagan 50250, Israel.

^* Corresponding author.

ABSTRACT

The effect of ash particle size, pH, and Ca(OH)₂ presence on the dissolution and adsorption of B by fly ash in aqueous media was studied. Most of the soluble B was found in the small particles of ash. Dissolution of B was independent of the dissolution of Ca from fly ash. Decreasing the pH from 12.5 to 6 increased both the solubility and the extractability of B. A small amount of B was adsorbed by fly ash at pH 7; this was attributed to a ligand exchange mechanism. Sorption of B increased with increasing pH, up to 12, which could not be explained by ligand exchange but rather with coprecipitation with CaCO₃.

Key Words: Alkaline fly ash • Boron toxicity • Coprecipitation boron-CaCO₃

Contribution from The Agric. Res. Organization, The Volcani Center.

Received for publication March 26, 1986.

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