Just got this back,mcgster wrote:Steffen, that may be a little rich for my blood! I am particular about my gravities though. I bet one of the lab supply stores would sell a standard solution, but finding one in NL is not likely!
Mark - I'm not sure that the % of water in the molecule matters, i think all sugars contain a large amount of water in the molecule but i'm not sure how this relates to the molecule once its dissolved in solution. The manufacturer just says 90 g water to 10g table sugar to make a calibration solution of 10 brix. The definition of brix is based off sucrose (1 degree brix = 1g of sucrose in a 100g solution) so i think as long as you do use table sugar the standardized solution should be accurate. Good point on the dextrose though, i just happened to have sucrose on hand.
"Hi Steffen,
We do have digital density meter and we would be able to calibrate the hydrometers according to its reading. There is no standard solution, ASBC uses the readings of an oscillating U-tube density meter. The anto-parr instrument that they use can read the density to the fifth decimal place 1.00693. we can only read to the fourth with our hand held unit. We could verify them but we could not certify them.
Cheers,
Mike Doucette MSc.
Chercheur/Chimiste - Centre précomercial de technologies en bioprocédés
Researcher/Chemist - Biorefinery Technology Scale-Up Center
160, rue Réservoir, Grand Sault, (N.-B.), E3Y 3W3
Téléphone/Telephone: 506-475-4037
Courriel/E-mail: mike.doucette@ccnb.ca
vision • passion • succès"
So it looks like you're back to verifying against a "trusted" hydrometer.
