By M. R. F. Ashworth
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A g N 0 . They filtered this off and heated a suspension in water for 30 min at ca. 100°C, yielding silver iodide that was easily filtered off; it was dried at 120-130°C and weighed. A reaction time of about 2 h was adequate for aqueous glycerol solutions. Zeisel and Fanto applied their method to determine glycerol in various wines and juices. 7). Criticisms of the method were expressed and improvements suggested. N o detailed discussion of this is made here and only a few references are given.
It is clearly applicable also for identifying the acrolein obtained from glycerol. For example, Jambor and Demeny (1936) detected glycerol in leather by converting it into aceolein and preparing the p-nitrophenylhydrazone. 4 GLYCEROL the tube a slide carrying a drop of a s o l u t i o n ^ p-nitrophenylhydrazine in 15 % acetic acid. Acrolein was then identified through the eutectic temperature of its p-nitrophenylhydrazone, thus prepared, with acetone p-nitrophenylhydrazone, prepared from a drop of aqueous acetone and the same reagent in excess.
2 4 2 7 3 2 3 3. Determination of Manganese Dioxide In a publication subsequent to those just mentioned, Berka and Pauleova (1971) determined glycerol (also ethylene glycol and mannitol) by boiling for 1 h with 0-1N potassium permanganate and 2M sodium carbonate. After cooling and adding enough sulphuric acid to achieve a 2 N concentration, they waited for 15 min, added 0*5M manganese(II) sulphate, and filtered off the manganese dioxide formed. This was dissolved in saturated pyrophosphate-4N sulphuric acid-0*5M manganese sulphate (6 + 2 + 1 ) , yielding the pyrophosphate complex of manganese(III).