Provisional Methods for the Determination of Food Preservatives As Authorized By
Provisional Methods for the Determination of Food Preservatives As Authorized By
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One cubic centimeter of fifth-normal soda solution is equal to 0. 0124 gram crystallized boric acid.
a For the purpose of confirmation valuable data can be secured with. Some products by weighing the material extracted by ether and also by titrating it with standard alkali, using phenolphthalein as indi- cator. One cubic centimeter of decinormal alkali is equivalent to 0. 0183 gram of saccharin.
b U. S. Dept. Agr. , Division of Chemistry, Bui. 51, p. 113.
c Thomson's method, Button's Volumetric... Analysis, page 100.
5. FORMALDEHYDE.
(a) PREPARATION OF SAMPLE.
If the material be solid or semisolid, macerate from 200 to 300 grams in a mortar with about 100 cc of water until a sufficient degree of fluidity is obtained. Transfer to a short- necked distilling flask of copper or glass of from 500 to 800 cc capacity and make distinctly acid with phosphoric acid. Connect flask with glass condenser and distill from 40 to 50 cc. In the case of liquids acidify with phosphoric acid and distill.
(b) PHENYLHYDRAZIN HYDROCHLORID METHOD.
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To quickly assess the difficulty of the text, read a short excerpt:
One cubic centimeter of fifth-normal soda solution is equal to 0. 0124 gram crystallized boric acid.
a For the purpose of confirmation valuable data can be secured with. Some products by weighing the material extracted by ether and also by titrating it with standard alkali, using phenolphthalein as indi- cator. One cubic centimeter of decinormal alkali is equivalent to 0. 0183 gram of saccharin.
b U. S. Dept. Agr. , Division of Chemistry, Bui. 51, p. 113.
c Thomson's method, Button's Volumetric... Analysis, page 100.
5. FORMALDEHYDE.
(a) PREPARATION OF SAMPLE.
If the material be solid or semisolid, macerate from 200 to 300 grams in a mortar with about 100 cc of water until a sufficient degree of fluidity is obtained. Transfer to a short- necked distilling flask of copper or glass of from 500 to 800 cc capacity and make distinctly acid with phosphoric acid. Connect flask with glass condenser and distill from 40 to 50 cc. In the case of liquids acidify with phosphoric acid and distill.
(b) PHENYLHYDRAZIN HYDROCHLORID METHOD.
What to read after Provisional Methods for the Determination of Food Preservatives As Authorized By?
You can find similar books in the "Read Also" column, or choose other free books by Zed20by20the20association20of20official20agr to read onlineMoreLess
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