how does dechlorinator work?

Discussion in 'Water Chemistry' started by aaronnorth, 15 Sep 2008.

  1. aaronnorth

    aaronnorth Member

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    Does anyone have a scientific forumla or a description on how dechlorinator works?

    Just a curious mind that's all :D
     
  2. ceg4048

    ceg4048 Expert/Global Moderator Staff Member

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    From what I gather most dechlorinators use some type of thiosulfate (S2O3--)as an active ingredient. Thiosulfate has two extra electrons to donate so it's considered a reducing agent. If Chlorine (Cl2) is in the water it will accept the electrons and become the negative ion Chloride (Cl-) which is harmless. I found this typical reaction equation:
    S2O3-- + 4Cl2 + 5H2O => 2SO42-- + 8Cl- + 10H+

    If the chlorinating agent used was bleach (Sodium Hypochlorite, NaClO) there is a similar reduction of the hypochlorite (ClO-) to chloride.

    I'm not sure about the reaction equation if the chlorinating agent is Chloramine (NH2Cl) but I believe that there is a similar reduction to chloride as well as ammonia residual production. So thiosulfates will neutralize the Chlorine portion but cannot neutralize the NH3 that forms.

    Products like Amquel use a different chemical. An Amquel site identifies this chemical as Sodium Hydroxymethanesulfonate, HOCH2SO3Na. According to that webpage (http://aquabaz.tripod.com/amquel1.htm) the hydroxymenthane part of the molecule (HOCH2) reacts with the ammonia to neutralize it.

    Cheers,
     
  3. aaronnorth

    aaronnorth Member

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    cheers mate, :D
     
  4. Themuleous

    Themuleous Member

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    Humm didnt know that :)
     

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