I think you would need to have a sample analyzed. I also think you would need to pull your sample from the entire batch of sap you intend to use because I am willing to bet that two trees a few hundred yards from each other will produce different mineral and pH profiles.
it's going to depende on the ground water and I would think lot's of other factors like health of the tree and such.
that's very accurate.. i used to make maple syrup when i lived in vermont. every tree is different and produces different grades of syrup...all a factor of the tree,the soil and the water.
Other organic compounds in the sap include organic acids, amino acids, amides, ammonia, and peptides. The organic acids in the sap include malic (0.21%), citric (0.002%), and traces of succinic, fumaric and several others. The total ash (mineral) content of the sap is 0.66 %. Common minerals include potassium (0.26%), calcium (0.07%), silicon oxide (0.02%) and lesser amounts of manganese, sodium, and magnesium.