. Dairy chemistry; a practical handbook for dairy chemists and others having control of dairies. Agricultural chemistry; Milk. REICHERT-WOLLXY PROCESS. 317 phenolphthalein for this purpose soon became apparent to many. N To the number of cubic centimetres of r-r alkali used one-tenth is added. Beichert-WoUny Process.—Wollny, in a now classic memoir, studied the errors of the Eeichert-Meissl process ; these are :— (1) Error due to the absorption of carbonic acid during the saponification (may amount to + 10 per cent.). (2) Error due to the formation of esters during saponification (may amount t
. Dairy chemistry; a practical handbook for dairy chemists and others having control of dairies. Agricultural chemistry; Milk. REICHERT-WOLLXY PROCESS. 317 phenolphthalein for this purpose soon became apparent to many. N To the number of cubic centimetres of r-r alkali used one-tenth is added. Beichert-WoUny Process.—Wollny, in a now classic memoir, studied the errors of the Eeichert-Meissl process ; these are :— (1) Error due to the absorption of carbonic acid during the saponification (may amount to + 10 per cent.). (2) Error due to the formation of esters during saponification (may amount to — 8 per cent.). (3) Error due to the formation of esters during the distillation (may amount to — 5 per cent.).. Fig. 42.—Reichert-Wollny Apparatus. (4) Error due to the cohesion of the fatty acids during distil- lation (may in extreme cases amount to — 30 per cent.). (5) Error due to the shape and size of the distilling vessel and to the time of distillation (may vary the results ± 5 per cent.). To avoid these errors he lays down the following method of working :— Five grammes of butter-fat are weighed into a round flask of about 300 capacity, with a neck 2 cm. wide and 7 to 8 cm. long; 2 of a 50 per cent, soda solution and 10 of 96 per cent, alcohol are added, and the heated for half an hour on the water-bath under a slanting inverted condenser ; between the centre and the flask is a T piece, which )s closed, the limb being turned upwards. At the expiration of half an hour the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Richmond, Henry Droop. London, C. Griffin & Company, Limited
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