Chemical Fractionation and Leachability of Boron in Waste Samples.

概要

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The leachability of boron in waste samples can vary both with boron content of the sample and with pH of the leachant. Boron leached more from dust, cinder and some waste ceramic samples when the solution was acidic, however, the mechanism of the leaching was not clear.<BR>In order to better predict boron emission from waste landfill site into leachate, boron in waste samples (incineration ash, slag, waste glass etc) were fractioned (exchangable, carbonatebound, Fe-Mn oxide-bound, organic matter-bound and residual) by sequential extraction method followed by ICP atomic emission spectrometry and/or neutron guided prompt gamma ray analysis for the determination of boron in each fraction.<BR>Distribution of boron among the five fractions differed from one sample to another. Correlation analysis of the results indicated that boron content in the "exchangeable" fraction was a better predictor of the leachability than was the total boron content of the sample.<BR>Thermal treatment (1300°C) of the waste samples altered the original distribution profile of boron in the samples: more boron was found in less leachable fraction. Thus the present results indicated that waste fusion is a preferable approach to lessen boron emission from waste into leachate after landfill.
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