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| Studies on volatilization of crude oils from three oilfields soils based on GC-MS and gravimetry |
| SHAN Xiao-ling1,2, LANG Meng-fan1, CHEN Hao1, ZHANG Shi-long1, WANG Tie-cheng1,2, HE Weng-xiang1,2, GUO Xue-tao1,2 |
1. College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China;
2. Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling 712100, China |
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Abstract Taking crude oils and surrounding soils from Shengli, Nanyang and Yanchang oilfields as research objects, a light-proof volatilization device with controllable temperature was designed to examine the effects of temperature and concentration on the volatilization of oil from polluted soils. a light-proof and ventilated experimental device of volatilization with controllable temperature was built to research the effects of temperature and concentration on oil volatilizing from soils. The results showed that the cumulative volatilization rate of petroleum hydrocarbons was positively correlated with temperature and negatively correlated with oil contents. The crude oil volatilized rapidly in the first three days, followed by gradual volatilization until reaching equilibration at 28days. The equilibrium volatilization percentage of Shengli crude oil was 34%, while above 55% and 70% for Yanchang and Nanyang crude oil, respectively. The volatilization of crude oil from soils fitted well with the first-order reaction kinetic equation (R2>0.968). The relationship between the equilibrium volatilization rate of crude oil from soils and temperature or oil concentration agreed with the Parabola2D surface model (R2>0.972). The composition changes of the three crude oils before and after volatilization were then qualitatively analyzed by GC-MS. The light components in crude oil volatilized continuously, while the varieties of heavy components increased initially and then decreased to a steady state in the end. This study provided a theoretical base for evaluating the environmental behavior of petroleum pollutants in soil and technical support for the remediation of petroleum contaminated soil.
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Received: 25 April 2023
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