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| Effects of various nitrogen and phosphorus concentrations on arsenic accumulation and transformation in Chlorella pyrenoidesa |
| Received:March 26, 2016 |
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| KeyWord:Chlorella pyrenoidesa;nitrogen;phosphorus;arsenic;accumulation;transformation |
| Author Name | Affiliation | E-mail | | LIU Cong | College of Resource and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | XU Ping-ping | College of Resource and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | WANG Ya | College of Resource and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | ZHENG Yan-heng | College of Resource and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | LIN Qiao-yun | College of Resource and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | TANG Hao | College of Resource and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | ZHANG Chun-hua | Laboratory Centre of Life Science, Nanjing Agricultural University, Nanjing 210095, China | | | GE Ying | College of Resource and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | yingge711@njau.edu.cn |
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| Abstract: |
| Nitrogen(N) and phosphorus(P) are important factors controlling the growth of microalgae such as Chlorella pyrenoidesa. The accumulation of arsenic(As) by this alga may be regulated through adjusting N and P concentrations in the culture. However, it is unclear whether the effects of N and P on the As uptake are related to microalgal growth changes. Therefore, we first studied the impacts of N and P concentrations on the growth of C. pyrenoidesa, and then chosen N(247 mg·L-1, 24.7 mg·L-1) and P(6 mg·L-1, 0.6 mg·L-1) concentrations that had no effects on the algal growth, to investigate their effects on the As metabolism in this algae under exposure of 0.8 mg·L-1 and 8 mg·L-1 As3+ and As5+. Results showed that the algal As accumulation and transformation were not affected when P was 6 mg·L-1 and N was decreased from 247 mg·L-1 to 24.7 mg·L-1. However, these processes were significantly impacted when N was 247 mg·L-1 and P was decreased from 6 mg·L-1 to 0.6 mg·L-1. The decrease in P supply also promoted the reduction, methylation and excretion of As in C. pyrenoidesa. These results indicate that, when N and P have no effects on the algal growth, P influences the As accumulation and transformation greater than N does. This study would provide a theoretical basis for elucidating the regulatory mechanisms of As metabolism and enhancing the efficiency of As pollution remediation in water. |
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