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| Effects of single and joint pollution of chromium (Ⅵ) and phenanthrene on microbiological enzyme activities in soil |
| Received:December 25, 2015 |
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| KeyWord:chromium (Ⅵ);phenanthrene;combined pollution;catalase;dehydrogenase |
| Author Name | Affiliation | E-mail | | WANG Xing | College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China | | | SHEN Gen-xiang | Shanghai Academy of Environmental Sciences, Shanghai 200233, China | | | HU Shuang-qing | Shanghai Academy of Environmental Sciences, Shanghai 200233, China | husq@saes.sh.cn | | GU Hai-rong | Shanghai Academy of Environmental Sciences, Shanghai 200233, China | | | CUI Chun-yan | College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China | | | ZHU Ming-yuan | Sino-German College of Technology, East China University of Science and Technology, Shanghai 200237, China | | | ZHAO Xiao-xiang | College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China | |
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| Abstract: |
| Soils have suffered from single or combined pollution by various pollutants including heavy metals and polycyclic aromatic hydro carbons (PAHs). However, the interactive and toxic effects of chromium (Ⅵ) and phenanthrene on soil microbiological enzymes activities remain unknown. In an indoor simulation test, the effects of single and co-exposure of chromium (Ⅵ) and phenanthrene on soil cata lase and dehydrogenase activities were examined in a paddy soil collected from Qingpu modern agricultural park in Shanghai. There were significant correlations between enzyme activity and concentrations of chromium (Ⅵ) and phenanthrene. Basically, the enzymatic activities decreased with increasing pollutant concentrations. However, at low concentrations of phenanthrene, the activity of catalase was promoted. For catalase, the 7 d-EC10 and 7 d-EC20 values of chromium (Ⅵ) were 203.61 mg·kg-1 and 471.48 mg·kg-1, respectively, while those of phenanthrene were 299.89 mg·kg-1 and over 800.00 mg·kg-1, respectively. For dehydrogenase, the 7 d-EC10 and 7 d-EC20 values of chromium (Ⅵ) were both less than 50.00 mg·kg-1, whereas those of phenanthrene were 113.63 mg·kg-1 and 223.49 mg·kg-1, respectively. These results indicated that dehydrogenase was more sensitive to both chromium (Ⅵ) and phenanthrene pollution than catalase was. The in teraction of chromium (Ⅵ) and phenanthrene showed antagonistic effects on catalase and dehydrogenase activities. The present findings would provide useful information for ecological risk assessments of combined pollution of soils. |
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