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Received July 20, 1994,Revised , Accepted , Available online

Volume 8,1996,Pages 66-76

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Side-effects of heavy metals(Cd and Zn)and organic pollutants(phenanthrene and paclobutrazol)on nitrification and respiration in a loam soil were investigated with its air-dried and fresh conditions. Critical levels for these test pollutants were derived from this investigation.Bioavailable concentrations of Cd and Zn were also determined. It was concluded that such critical levels as NOEL and LOEL of heavy metals should be expressed using bioavailable concentrations rather than total ones since different soil has different properties,especially different absorption ability to heavy metals.

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