# Chloramine Quandry...

```After putting my college education to use and a bit of web surfing:
EVERYTHING BELOW IS BASED ON APPROXIMATES.  NO
EXPERIMENTERS WERE HARMED DURING THESE
CALCULATIONS!!!  : ))

Half-life of chloramine: 8 hours to 20 days depending on conditions
Dissociation rate:  4.9*10^-33  or
.00000000000000000000000000000049 %
is found as NH4+ and Cl-
Drinking water concentration:   3.56mg/L

Assuming a first order reaction to break down (couldn't find data):
rate(8 hours)=.087                      /hour
rate(20 days)=1.4*10^-3            /hour

This means that somewhere between .14 and 8.7 percent of the
remaining
chloramine breaks down per hour.

And for you David, THE EQUATION!!!
*******************************
Concentration @ time T=Original Concentration* e^(rate from above*T)

C=(3.56mg/L)2.71828^(-.087*T)

********************************

If we assume the standard concentration (call your municipal supplier.)
Using Bob Dixon's overnight "airing out"  (be generous and give 12
hours.)

Final Concentration=1.26 mg/L

Still there, but about 1/3 the concentration.

Hope this clears the water.   : )

Douglas Bertelsen
(Chemical Engineer in Training who uses a Python and no chlorine
remover)
dbert at umr_edu

```