Chlorine and L-Ascorbic Acid

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Intersting reading confirming some of the chemistry we're using:

http://www.rsc.org/delivery/_ArticleLinking/DisplayArticleForFree.cfm?doi=a9

09046k & JournalCode=EM

>Many potable water disinfection byproducts (DBPs) that result from the

reaction of natural organic matter

(NOM) with oxidizing chlorine are known or suspected to be carcinogenic and

mutagenic. The Ames assay is

routinely used to assess an overall level of mutagenicity for all compounds

in samples from potable water

supplies or laboratory studies of DBP formation.<

........

>L-Ascorbic acid, better known as vitamin C, is known to

react stoichiometrically with iodine and rapidly with hypochlorous

acid. In reaction with halogens or hypohalous acids,

ascorbic acid is oxidized to dehydroascorbic acid, which exists

in several forms and can itself decompose. Accordingly, Lascorbic

acid was deemed a possible choice for scavenging

chlorine in potable water samples or quenching large excesses

of active chlorine in studies on DBP formation.<

........

>It appears that ascorbic acid can satisfactorily meet both the

chemoanalytical and bioassay needs associated with monitoring

DBP formation, especially in a laboratory study. Nonetheless,

this work does not demonstrate that ascorbic acid is

suitable under all conditions and for all water supplies.

Investigators wishing to use this compound to scavenge

residual chlorine are cautioned to carefully evaluate the

potential matrix interactions. Certainly, ascorbic acid is the

most promising candidate we have found thus far, and we

anticipate it will prove useful in future investigations of

chlorination byproduct formation.<

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