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  1. #1
    Join Date
    Jan 2010
    Location
    Gilmer,TX USA
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    1,830

    Default Anyone use liquid N2?

    Wanted to know if anyone on here uses liquid N2 and if they have any recommendations as to what to buy. I am wanting this to test of Hygienic traits. Freezing brood seems like a pain. Are there any alternatives to N2?

    Thanks
    mike
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  2. #2
    Join Date
    Nov 2006
    Location
    Chapel Hill, NC
    Posts
    707

    Default Re: Anyone use liquid N2?

    While it is still a freezing process, dry ice can take the place of liquid N2. It has a temperature of -109.3F. Crush it up so it has better contact with the base of the food can on the brood. It's easy to buy at local grocery stores for a few dollars per pound.

  3. #3
    Join Date
    Oct 2006
    Location
    Lancaster CA
    Posts
    410

    Default Re: Anyone use liquid N2?

    Most milk cow dairies use LN2. It can be transported and stored in a stainless thermos.

  4. #4
    Join Date
    Dec 2009
    Location
    Deposit,NY
    Posts
    110

    Default Re: Anyone use liquid N2?

    Whatever you use make sure to not make skin contact. use plenty of protection. Very heavy gloves, goggles, etc.
    Cheers,
    Paul VanSlyke

  5. #5
    Join Date
    Jan 2010
    Location
    Gilmer,TX USA
    Posts
    1,830

    Default Re: Anyone use liquid N2?

    Please keep the suggestions coming. Robert Russell said that one could fill some coffee cups with water with a popcicle stick in the middle, freeze it, and set in on the brood for something like 3 minutes. I am still open to suggestions.

    mike
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  6. #6
    Join Date
    Aug 2002
    Location
    Nehawka, Nebraska USA
    Posts
    45,313

    Default Re: Anyone use liquid N2?

    http://en.wikipedia.org/wiki/Liquid_nitrogen

    I have a dewar that will keep it for six months or more, but won't make it a year. I get it filled locally at the welding place. Try a search online you'll find many variations on price and capacity.
    Michael Bush bushfarms.com/bees.htm "Everything works if you let it." ThePracticalBeekeeper.com 40y 200h 37yTF

  7. #7

    Default Re: Anyone use liquid N2?

    I use it to test also. The local welding supply house sells me a gallon for $40. WE put it into stanley 2 quart thermos. Drill a very small hole in the top to let it gas out so it does not go boom. It is a lot easier then I thougt when we started using it. I had gloves and safty glasses and was scared to death of it. Now I do not use anything and pour 4 oz into a soup can pushed into the brood and move on. It will only last about 24 hours in the thermos so we get two.

  8. #8
    Join Date
    Jan 2010
    Location
    Gilmer,TX USA
    Posts
    1,830

    Default Re: Anyone use liquid N2?

    That is expensive! How many hives will that do?

    mike
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  9. #9
    Join Date
    Sep 2010
    Location
    Minneapolis, MN
    Posts
    24

    Default Re: Anyone use liquid N2?

    The chain Airgas has the cheapest N2 I could find. You are supposed to use 10oz of N2 per test, but since some will evaporate off (or you may spill some) you may only be able to do about 10-12 tests. The U of MN has a poster online with instructions:

    http://www.extension.umn.edu/honeybe...est%208x11.pdf

    You could cut out a portion of comb, throw it in your freezer, and put it back in one frozen. Marla Spivak and Gary Reuter, the ones that came up with the liquid N2 test claim dry ice doesn't freeze the brood well enough it kill it all. I've never tried it. It is hard to tell if the brood is still alive or not just by looking. You could give dry ice a try and monitor that section over time (longer than 24hr) to see if the bees clean it out or if it ages.

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