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    STUDIA CHEMIA - Ediţia nr.4(I) din 2009  
         
  Articol:   KINETIC MODEL FOR CHLORINE DECAY AND DISINFECTION BY-PRODUCTS FORMATION USING ABTS METHOD AND DPD METHOD.

Autori:  MELINDA-HAYDEE KOVACS, DUMITRU RISTOIU, SIDONIA VANCEA, LUMINIŢA SILAGHI-DUMITRESCU. 		 
       
         
  Rezumat:  The kinetics of chlorine decay of the pre-treated water collected once a month from the Gilau Water Treatment Plant after one of the sand filters was investigated. The chlorine species reacts with ABTS (2,2-azino-bis(3-ethylbenzothiazoline)-6-sulfonicacid-diamonium salt) to yield a green colour product that is measured at 405 nm wavelength with a spectrophotometer. The second method used for the investigation of chlorine consumption was by means of DPD (N,N-diethyl-p-phenylenediamine), where chlorine oxidizes DPD which takes on a red colour. The absorption is measured with a spectrophotometer at a wavelength of 515 nm. Both methods are useful for the determination of chlorine consumption in the treated water from distribution systems.

Keywords: Disinfection by-products, ABTS method, Chlorine consumption, THM formation.
  
         
     
         
         
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