Pollutants residue in soil and the eco-toxicity after irrigation with petroleum wastewater

Abstract

Abstract: Soil samples were collected from several sites in the up,middle and dowstream along the petrol-wastewater irrigation channel,eastern Shenyang.Concentrations of heavy metals (Cd) and mineral oil were analyzed.The eco-toxicity of soil was evaluated.Heavy metals (Cd) were determined by AAS (atom adsorption spectrometer),mineral oil was measured by UVspectrometer.The eco-toxicity of soil was based on the method of international standardization of organization (ISO) and OECDguideline 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 mortality rate and inhibition rate of weight growth as endpoint' earthworms test was conducted and the experimental period was 28d.Results showed that all soil tested have low accumulation of mineral oil measured with concentration of 66.22～1391.14 mg·kg^-1.Cd was slightly higher than the background value with content of 0.06～0.37mg·kg^-1.Soil showed a strong stimulation effect on root elongation of plant,and a lethal and sub-lethal effect on earthworms was observed.The stimulation rate of root elongation based on germination test was -28.61% to -54.65%.The mortality rates of earthworms at maximum were stimulated and then 10%.The body weight growth were stimulated and then inhibited from -5.13% to -28.05% in 14d,and -31.78% to 8.08% in< 28d.Study indicated that long-term of irrigation with petroleum wastewater resulted in the low residue of mineral oil and observed eco-toxicity.

Key words: Acer ginnala, Pyrus ussuriensis, Acer mono, Malus baccata, Soil Cd contamination, Growth response, Tolerance

CLC Number:

X171.5

SONG Yufang, ZHOU Qixing, SONG Xueying, ZHANG Wei. Pollutants residue in soil and the eco-toxicity after irrigation with petroleum wastewater[J]. cje, 2004, (5): 61-66.

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