Robinson A R, MacLean K S, MacConnell H M
Nova Scotia Agricultural College, Chemistry-Soils Department, Truro, Canada.
J Assoc Off Anal Chem. 1989 Jul-Aug;72(4):674-9.
Maple sap and syrups in eastern Canada were analyzed for pH, total solids, and the heavy metals Cu, Fe, Pb, and Zn. The levels of heavy metals found were within the range normally contained in food and water samples except for Pb. The concentration factor found in reducing sap to syrup did not reflect the same concentration change for the measured parameters. This indicates removal or conversion of heavy metals and organic acids with the sugar sands. There was no statistical difference among provinces with respect to the heavy metal, pH, and total solids content of sap. The only significant difference in syrup occurred with Cu and this appeared to be the result of the processing procedure. As the season progressed, the Cu, Pb, pH, and total solids content of the sap decreased while Zn increased and Fe showed little change. Syrups reflected a similar change. Statistical differences occurred in sap composition among sites within each province.
对加拿大东部的枫糖浆和枫糖进行了pH值、总固体以及重金属铜、铁、铅和锌的分析。除铅之外，所发现的重金属含量在食品和水样通常含有的范围内。将树液浓缩成糖浆时发现的浓缩系数并未反映出所测参数的相同浓度变化。这表明重金属和有机酸通过糖砂被去除或转化。就树液中的重金属、pH值和总固体含量而言，各省之间没有统计学差异。糖浆中唯一显著的差异在于铜，这似乎是加工过程导致的结果。随着季节推进，树液中的铜、铅、pH值和总固体含量下降，而锌含量上升，铁含量变化不大。糖浆也呈现出类似的变化。各省境内不同地点的树液成分存在统计学差异。
