Estimation of the Soil Chromium Concentration Caused by a Plating Plant and Paints on Road Surface and its Effect on Earthworm

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  • KAMITANI Takafumi
    Research Center for Chemical Risk Management, National Institute of Advanced Industrial Science and Technology
  • ONO Kyoko
    Research Center for Chemical Risk Management, National Institute of Advanced Industrial Science and Technology
  • YOSHIDA Kikuo
    Research Center for Chemical Risk Management, National Institute of Advanced Industrial Science and Technology

Bibliographic Information

Other Title
  • めっき工場および道路標示に由来する土壌クロム濃度の推定とミミズへの影響
  • メッキ コウジョウ オヨビ ドウロ ヒョウジ ニ ユライスル ドジョウ クロム ノウド ノ スイテイ ト ミミズ エノ エイキョウ

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Description

Soil hexa- and tri-valent chromium concentrations caused by deposition from the atmosphere were estimated, followed by comparison with earthworm ecotoxicity values. Two hypothetical emission sources, a chromium plating plant and yellow paints on road surface, were assumed to determine the emission rates of hexavalent chromium from them. The deposition amount of hexavalent chromium on soil was calculated with the Low-rise Industrial Source Dispersion Model: METI-LIS. One compartment model was used to predict the concentrations of hexa- and tri-valent chromium in soil in consideration of the reduction of hexavalent chromium. A probabilistic Monte Carlo approach was conducted to take the uncertainty of some input parameters into account: soil-water partition coefficients and first-order rate constants for reduction. Margin of Exposure (MOE) values for hexa- and tri-valent chromium were obtained as the ratio of no-effect observed concentration (NOEL) values for earthworms to the estimated exposure concentrations. The NOEC values were determined to be 0.62 mg/kg and 32 mg/kg for hexa- and tri-valent chromium, respectively. The MOE values for 95th percentile predicted concentrations near the plating plant exceeded 10, meaning no effect on earthworm. However, the MOE values of the roadside were less than 10, indicating the necessity of detailed ecological survey with analyses of chemical forms and valence states of chromium in soil.

Journal

  • ENVIRONMENTAL SCIENCE

    ENVIRONMENTAL SCIENCE 20 (6), 461-475, 2007

    SOCIETY OF ENVIRONMENTAL SCIENCE, JAPAN

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