Journal of Ecology and Rural Environment ›› 2015, Vol. 31 ›› Issue (2): 238-243.doi: 10.11934/j.issn.1673-4831.2015.02.0015

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Effects of F- and Cl-on Growth of Chlamydomonas reinhardtii

 LI  Qian, WU  Yan-You, LIANG  Yong-Jie, WU  Yun-Dong, ZHU  Hong-Li   

  1. School of Environment and Safety Engineering,Jiangsu University
  • Received:2014-07-16 Revised:2014-09-05 Online:2015-03-25 Published:2015-04-15

Abstract: To explore toxic effects of F- and Cl- on growth of Chlamydomonas reinhardtii for comparison, algal biomass, specific growth rate and growth inhibition rate as affected by concentration of F- or Cl- were determined with the Erlenmeyer flask cultivation method and model analysis. Results show that F- in the range of 5-80 mg·L-1 was toxic to C. reinhardtii, inhibiting its growth and the growth inhibition rate increased with increasing exposure time and F- concentration, but its maximum growth inhibition rate dropped below 62% on D 10, which suggests that C. reinhardtii is quite tolerable to F- below 80 mg·L-1 in concentration. By contrast, Cl- could either promote or inhibit growth C. reinhardtii of  depending on Cl- concentration. When Cl- concentration was up to 12800 mg·L-1, its growth inhibition rate reached as high as 96%. F- and Cl- differs in effect on growth of C. reinhardtii, which is reflected mainly in the laws of the functions of the growth effect models varying with F- or Cl- concentration. Besides, in terms of EC50 under the same exposure time  F- (18.0 to 56.4 mg·L-1) was far too lower than Cl- (1 074 to 2 360 mg·L-1). That is to say, F- is more toxic to C. reinhardtii than Cl-,but the ecological risk of Cl- in the environment may not be ignored, either.

Key words: fluoride ion (F-), chloride ion (Cl-), Chlamydomonas reinhardtii, growth, inhibition, model

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