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Reference solutions

Discussion in 'General Plant Topics' started by Henry Hatch, Jan 12, 2008.

  1. Henry Hatch

    Henry Hatch Guru Class Expert

    Aug 31, 2006
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    4:55 PM
    I was thinking about making reference solutions for NO3 and PO4 testing. I found Tom"s instructions for making the solutions and noted that the amounts of KNO3 and KH2PO4 to be used went out to 3 decimals. How accurate a scale do I need to do this and can I get one at a reasonable price ?

    Also can I use regular distilled water instead of ro/di ? Does it need to be USP grade ?

  2. Tom Barr

    Tom Barr Founder
    Staff Member Administrator

    Jan 23, 2005
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    4:55 PM
    LeftC just modified his instructions for 2 decimal places, I would suggest Ebay for a cheap decent scale to 3 places.

    Tom Barr

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