Accumulation of pollutants in sediments and their eco-toxicity in the wastewater irrigation channel of western Shenyang

Abstract

Abstract: Sediment samples were collected from several sites in the upper,mid and lower reaches of the petroleum wastewater irrigation channel in western Shenyang of China,and the concentrations of their heavy metal Cd and mineral oil were determined.The results showed that pollutants were accumulated in all test sediments,with 400～12 500 mg·kg^-1 mineral oil and 1.6～27.2 mg·kg^-1 Cd.The sediments had significant inhibition effects on plant and earthworm.The inhibition rate of root elongation based on germination test was 10%～60%.During 14 d and 28 d exposure,the mortality rate of earworm was 0%～70% and 0%～85%,and the inhibition rate of its body weight growth was -21.9%～17.7% and -18.6%～37.0%,respectively.It indicated that a long-term irrigation with wastewater resulted in the accumulation of pollutants in channel sediments and enhanced eco-toxicity.As an important source of pollution,the migration and release of pollutants in sediments possessed potential risks to underground water and soil.

Key words: Sediments, Wastewater irrigation, Earthworm, Higher plant, Eco-toxicity

CLC Number:

X171.5

SONG Yufang, ZHOU Qixing, SONG Xueying, ZHANG Wei, SUN Tieheng. Accumulation of pollutants in sediments and their eco-toxicity in the wastewater irrigation channel of western Shenyang[J]. Chinese Journal of Applied Ecology, 2004, (10): 1926-1930.

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