Eco-toxicity of petroleum hydrocarbon contaminated soil |
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Authors: | Jingchun Tang Min Wang Fei Wang Qing Sun and Qixing Zhou |
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Institution: | College of Environmental Science and Engineering, Nankai University/Key Laboratory of Pollution Processes and Environmental Criteria,Ministry of Education, Tianjin 300071, China |
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Abstract: | Total petroleum hydrocarbons (TPH) contaminated soil samples were collected from Shengli Oilfield of China. Toxicity analysis was
carried out based on earthworm acute toxicity, plant growth experiment and luminescent bacteria test. The soil was contaminated bypetroleum
hydrogcarbons with TPH concentration of 10.57%. With lethal and sub-lethal rate as endpoint, earthworm test showed that
the LD50 (lethal dose 50%) values in 4 and 7 days were 1.45% and 1.37% respectively, and the inhibition rate of earthworm body weight
increased with higher oil concentration. TPH pollution in the soil inhibited seed germination in both wheat and maize experiment when
the concentration of petroleum was higher than 0.1%. The EC50 (e ective concentration 50%) for germination is 3.04% and 2.86%
in maize and wheat, respectively. While lower value of EC50 for root elongation was to be 1.11% and 1.64% in maize and wheat,
respectively, suggesting higher sensitivity of root elongation on petroleum contamination in the soil. The EC50 value in luminescent
bacteria test was 0.47% for petroleum in the contaminated soil. From the experiment result, it was concluded that TPH content of 1.5%
is considered to be a critical value for plant growth and living of earthworm and 0.5% will a ect the activity of luminescent bacteria. |
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Keywords: | toxicity total petroleum hydrocarbon soil earthworm contamination |
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