[Evaluation of eco-toxicity of integral quality of soils]

Soil samples are collected from several sites along the wastewater irrigation channel, western Shenyang. The concentration of heavy metal(Cd)and mineral oil is analyzed. The eco-toxicity of soil is evaluated. Heavy metal (Cd) isdetermined by atom adsorption spectrometer(AAS), mineral oil is measured by UV spectrometer. The eco-toxicity of soil is based on the method of international standardization of organization (ISO) and OECD guideline with some modification. With inhibition rates of root elongation of wheat as endpoint seed germination test was performed and the duration period was 50h. With lethal and sub-lethal effects as endpoint earthworms test was conducted and the experimental period was 28d. And micronuclear( MCN) test was conducted. Results show the mineral oil in soils were 145 mg/kg - 1 121mg/kg, Cd was 0.34mg/kg - 1.81mg/kg. The inhibition rate of root elongation based on germination test was 2.0% - 35.1%, MCN in soil was significant higher than that in the control. The mortality rates of earworms were 0% - 40%. The inhibition rates of body weight growth were -2.3 % to -19.4% from 14d to -2.1% - 10.7% in 28d. The maximum value of MCN in soils was 6.62/100. The study indicates a lower accumulation of pollutants in soils but enhanced ecotoxicity.