egclassic Posted December 1, 2012 Report Share Posted December 1, 2012 I have a Taylor dpd test kit and, of course, I am using Bromine. I am trying to get my new pentair floater set properly, and I was wondering, when you test for bromine should you read the results immediately or let it sit for a minute? Seems if I read it right after I flip the tester a couple times, I get a reading of about 2. If I let it sit for a minute or two, it seems to increase a bit, not much, but a little. Quote Link to comment Share on other sites More sharing options...
Topspeed007 Posted December 23, 2012 Report Share Posted December 23, 2012 You should test and add titrant until water colour doesn't change anymore. Should only take a minute or so or bromine test using dropper. Quote Link to comment Share on other sites More sharing options...
egclassic Posted December 24, 2012 Author Report Share Posted December 24, 2012 According to instructions, when testing for Chlorine/bromine you only add 5 drops of each reagent, there is no end point like when testing for TA or CH. Quote Link to comment Share on other sites More sharing options...
chem geek Posted December 24, 2012 Report Share Posted December 24, 2012 Yes, you are using a DPD test which is "compare color to a standard" and not the FAS-DPD test which is "count the drops". With DPD, you don't wait and instead thoroughly mix and then compare. Usually, waiting is an issue with the DPD chlorine test since high monochloramine levels can "bleed through" and measure as FC if you wait. The bromine test measures Total Bromine since even monobromamine (by being in equilibrium with monobromammonium ion which may form Br+) reacts with DPD dye. Quote Link to comment Share on other sites More sharing options...
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