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Thread: Rescue Calcium Nitrate

  1. #1 Rescue Calcium Nitrate 
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    Hi All
    I am new to this forum and I am looking for some advice on the use and storage of Calcium Nitrate (Ag grade) that I use in hydroponics.
    More to the point, finding the best way to get the required amount of CaNO3 when the crystals may have absorbed some atmospheric moisture.
    I received my supply in the post, it was double plastic bagged but at one stage I did notice what appeared to be moisture on the crystals and some has discolouration.
    My concern now is that if it has absorbed moisture that when I am measuring out my CalNit by weight it might not be accurate as the crystals probably have become heavier (or I could be completely wrong - which would be great).
    If the absorption of moisture has affected it as above is there a way I can determine the correct amount to use.
    One thought I had was if I made it all into solution to a point where I could measure the ppm and use that to calculate how much to use (I only have a cheap TDS/ppm meter) but if that would work how stable (how long could I keep and use) this solution, I'll worry about the math later0.
    You may say it would be easier to dispose of it and get some more but it could end up the same due to coming through the post which I have no control of.
    Also any suggestions on the best storage/handling practices (I am only talking about 1 or 2 Kg) to try and prevent further (or future) spoilage - at present it is double bag in fairly thick clear plastic bags and I keep it in a semi-controlled cabinet that remains between 10 - 20 deg C at 45 - 65% relative humidity inside a closed plastic box at the very bottom of the cabinet (it has appears to have remained in an unchanged so far, as best as I can tell).

    Hope that all makes some sense.
    Thx


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  3. #2  
    Bullshit Intolerant PhDemon's Avatar
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    You can dry it out in an oven, we have one in the lab we can set to around 50 C. Putting salts/crystals in this overnight usually gets rid of any excess water. I wouldn't go much hotter though.

    Your storage seems fine, the only thing I would say is make sure there is no possibility of any organic liquids (oil, petrol, acetone, alcohols etc) mixing with it. You could put packs of drying agent in your plastic box around the bag, silica gel packs would be ideal.


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  4. #3  
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    Thanks PhDemon.
    Is it all good to do this spread out thinly on a metal tray - not sure our oven goes that low but i will test with probe thermometer first, I think the oven may have a dehydrate setting.
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    Bullshit Intolerant PhDemon's Avatar
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    Should be fine spread out on a tray or in a beaker or pot. If the oven is too hot it might start to decompose... I can't remember how thermally stable calcium nitrate is off the top of my head.
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