Re: [Killietalk] Chlorine and Chloramine.

[LeeH920226 at aol_com]

In a message dated 2/3/04 10:12:49 AM, listhub at libros_andante.mn.org writes:

<< All comments welcome
john >>

OK, there is one more test you need to do. If the water out of the RO unit 
tests for chlorine, does it also test for chloramine? That test is normally a 
test for ammonia after the test for total chlorine followed by a test for 
ammonia after destroying the chloramine with hypo.  It is possible (at least in my 
mind) that the RO membrane rejects chloramine but allows chlorine to go through 
based on the dipole moment, or ionic character of the molecule. It is not a 
size exclusion membrane, per se, but rejects because of dipole interaction. Now 
if this dipole interaction with the chloramine is strong enough it may induce 
dissociation of the chlorine-nitrogen bond and break the chloramine molecule 
into its components allowing the chlorine to proceed  and tie up the ammonia. 
Now I assume there is a carbon filter on the downstream side for the low TDS 
water from the RO unit but not on the "waste water" line.
    Regardless of the mechanism, tests are in order for both chlorine and 
chloramine at both exits from the RO unit.

Lee Harper
Media, PA

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