ISSN:
1750-3841
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
Calcium Zeo-Karb (zeolite) will effectively remove lead from maple sap even when the lead concentration is as much as 36 p.p.m. in terms of syrup. This base-exchange action of the calcium of the Calcium Zeo-Karb and the lead in the maple sap are independent of the temperature in the range between 5 and 60°C.(41 and 140°F.), but it is dependent upon the contact time (rate of percolation of the sap through the zeolite). When a contact time of one minute was used, the lead concentration was effectively reduced from 36 p.p.m. to less than one p.p.m.The present study has been limited to the removal of lead from maple sap by means of a base-exchange material; however, the authors are continuing this work and are now conducting experiments on the removal of zinc, copper, iron, and tin from maple sap with this material.During the 1939 maple-sugar season a calcium Zeo-Karb treatment plant will be set up and used in a sugar bush to ascertain its value under actual operating conditions.This paper is written before the completion of the work on the removal of the other heavy metals from maple sap, since the question of lead in maple products is very keen at the present time and the authors feel that this paper may be of some value to other workers.The use of this base-exchange material would be extremely simple. It would only need to be assembled in the pipe line leading from the maple-sap storage tank to the evaporator. It should require no attention whatever except to recharge it with calcium chloride at the beginning of each sugar season. The Zeo-Karb, if kept clean and washed well after each season's use, should last indefinitely.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1365-2621.1939.tb17142.x
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