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  1. #1

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    Benzotriazole Shelf Life?

    Can anyone comment on how long this will keep in solution? Thanks.

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    Quote Originally Posted by maxbloom View Post
    Can anyone comment on how long this will keep in solution? Thanks.
    in my experience, Benzotriazole keeps pretty well in slightly alkaline solutions. Take a look at this photo.net thread:

    http://photo.net/bboard/q-and-a-fetch-msg?msg_id=0097vg
    Tom Hoskinson
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  3. #3
    Snapshot's Avatar
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    My 1% solution in tap water seems to work and it's been about a year. My tap water is slightly alkaline (about 7.6 ph) so this might be a factor.
    "The secret to life is to keep your mind full and your bowels empty. Unfortunately, the converse is true for most people."

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    Any recommendations on an appropriate alkaline additive to my neutral pH water?

  5. #5
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    What about dry BZT shelf life?
    Murray

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    Quote Originally Posted by Murray@uptowngallery View Post
    What about dry BZT shelf life?
    from the thread link I posted earlier:

    Benzotriazole can also decompose slowly in alkaline solution. A neutral organic solvent is best for long shelf life.

    Ethyl, Propyl, or Methyl alcohol are best.

    Ron Mowrey
    Tom Hoskinson
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  7. #7
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    Sodium sulphite is alkaline. A small amount will do, probably in the range of a 1% solution (10g per litre), which should give a pH in the neighborhood of 7.5 or so. A 5% solution will give a pH of 8.0 or so. This could have some impact on photochemical reaction depending on how it is used. However, you'll likely be using a small amount benzotriazole so it may not matter. Isopropyl alcohol would be a good liquid to dissolve in as well.
    "The secret to life is to keep your mind full and your bowels empty. Unfortunately, the converse is true for most people."

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    I'll give isopropanol a try. AFAIK it's generally the least reactive of the three.

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    Quote Originally Posted by Tom Hoskinson View Post
    from the thread link I posted earlier:

    Benzotriazole can also decompose slowly in alkaline solution. A neutral organic solvent is best for long shelf life.

    Ethyl, Propyl, or Methyl alcohol are best.

    Ron Mowrey
    Hmmm...all the alcohols I know are quite WET.

    I think dry BZT lasts a very long time. I've had no trouble using stuff that is years old.


    Wayne

  10. #10

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    Benzotriazole is used in boilers as a corrosion inhibitor. Since it lasts well in those conditions it should last quite well in a bottle of solution in the home. It dissolves better in mild alkaline solutons. Sodium sulphite is alkaline enough to improve its solubility. This what the old Orthazite solution was.



 

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