Input and Output of Boron at a Waste Disposal Site.

概要

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Leachate samples from 2 adjacent municipal waste disposal sites (n=7 each), water samples from a stream which runs nearby the sites (n=7), and precipitation (n=12) of the area were collected over 15 months period beginning from November 1997. Boron concentrations in the water samples were measured by ICP atomic emission spectrometry and ICP mass spectrometry to estimate input and output of boron at the sites. Median boron concentration in the leachates (1.3 mg/l for both of the sites) was 600 times higher than that in precipitate (0.0021 mg/l) indicating leaching of boron from the waste disposed. Median concentration in the stream water was intermediate (0.062 mg/l) and it indicated that boron from natural origin alone can increase the concentration by a factor of 30. Annual input of boron to the sites was estimated by the median boron concentration in the precipitate and the site area. The output was by boron concentration in the leachates and annual leachate treatment volume. Annual input of 350 g and output of 62000 g was obtained and the output input ratio was calculated to be 180 being less than that of alkali metals (>3000), and similar to that of alkaline earths. These results indicate that the disposed waste does release boron into the leachate but the magnitude of the release is similar to, or less than, that of other elements.
日本環境化学会の論文