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Thread: TA re-agents

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    Join Date
    May 2010
    SW Georgia

    TA re-agents

    Can the TA re-agents lose there effectiveness over time? I just opened a new bottle of R0009 (The solution for the last step) and my TA spiked up 20 ppm. I performed the test just as I normally do.
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  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: TA re-agents

    While it is possible for them to go bad, they last quite a long while and several other things normally go bad first.

    A difference of 20 isn't all that large. The test is +-10 to begin with. It doesn't take all that much, say a slight difference in dropper tips or slightly different sample sizes, to get it to +-20.
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  3. Back To Top    #3
    Melt In The Sun's Avatar
    Join Date
    Oct 2009
    Tucson, AZ

    Re: TA re-agents

    You probably already know this, but the R-0009 sometimes has a bit of static charge so you need to wipe the dropper tip after every few drops. That could easily account for the 20 ppm difference.
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