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Chinese Journal of Applied Ecology ›› 2001, Vol. ›› Issue (3): 458-460.

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Identification of key toxicants in a bleaching effluenta case study

YU Hongxia, CHENG Jing, JIN Hongjun   

  1. School of the Environment, State Key Laboratory of Pollution Control and Resource Reuse, Nanjing University, Nanjing 210093
  • Received:1999-11-23 Revised:2000-06-16 Online:2001-05-25

Abstract: The toxicity identification evaluation (TIE) was conducted with a toxic bleaching effluent to identify its toxic components. Toxicity characterisation procedures (phase Ⅰ) indicated that the primary toxicants in the effluent were volatile,and could be reduced by sodium thiosulfate. Toxicity based fractionation techniques (phase Ⅱ) were conducted,and the oxidation organic chloridates were found not to be the major toxicants.Deletion approach of phase Ⅲ confirmed that the toxicity decreased with the decrease of free and total residual chlorine concentrations,indicating that Cl2, HClO and ClO were identified as primary toxicants in the effluent.

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