Soil Surveys of Lead Contamination in Saitama Prefecture and Factors Affecting Leachability of Lead

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  • 埼玉県における鉛汚染土壌調査事例と鉛溶出量に影響を及ぼす因子
  • サイタマケン ニ オケル ナマリ オセン ドジョウ チョウサ ジレイ ト ナマリ ヨウシュツリョウ ニ エイキョウ オ オヨボス インシ

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Abstract

The present paper describes the soil surveys of lead contamination at the clay target shooting range and around of the industrial waste incinerator located in Saitama Prefecture. In these surveys, lead leachabilities of soil samples without contamination frequently exceeded environmental quality standard (0.01mg/l) normalized in soil contamination countermeasures low. Lead leachabilities closely related to the soil type in the contaminated areas and exceedances of environmental quality standard of lead were mainly observed in the case of non-volcanic ash soils. In the case of volcanic ash soils, on the other hand, lead leachabilities did not exceed environmental quality standard at all, even at lead contents in soils more than 150mg/kg. Leads in the leached solution were present as colloid with organic-inorganic composites that were consisted of humic substances and clay particles. Parts of these soil colloids which were very fine particles were easily dispersed in the liquid phase during soil leaching test and any of them could not be captured by a 0.45 μm membrane filter. Lead colloids hardly permeated through the soil column and had little possibility of diffusion to the groundwater. For a correct estimation of lead contamination based on soil leaching test, an examination of the soil properties at the field and appearances of the leached solution obtained is extremely important as well as analytical results.

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