Evolution of carbon dioxide from

Nitrogen. To one portion of the filtrate, add z-3 ml. of 10, aqueous sodium hydroxide solution, then add about o-2 g. of ferrous sulphate and proceed as in the Lassaigiie nitrogen test (p, 322). Note, however, that the fiUal acidification with dilute siiphiiric acid must be made with care, owing to the vigorous evolution of carbon dioxide from the carbonate present. 

The original method was based on the observation that a boiling mixture of ferric chloride and hydrochloric acid causes relatively rapid evolution of carbon dioxide from o-glucose. When cellulose is heated with these reagents, o-glucose is formed by hydrolysis, and is then oxidized to yield... 

In Figure 8, the evolution of carbon dioxide from formulation "B" during foaming is shown measured by infrared absorbance at... 

Figure 8. Evolution of carbon dioxide from reacting foam, Formulation B, measured by infrared absorbance at 2320 cm 1.

In Figure 9, the rate of evolution of carbon dioxide from formulation "A" is compared with the rise and "gel profiles" for this formulation. A maximum in cell-opening is measured before full rise height is achieved and at the time of an inflexion in the rise-rate curve. This maximum in the rate of cell-opening happens while the processes measured by "gel profile" are occurring. 

The continuous evolution of carbon dioxide from water-blown foam from the earliest times of reaction is a mechanism for significant heat loss from free-rise foam, the magnitude of which will depend on the scale of foaming. This observation offers an explanation for the departure from adiabaticity, lower than expected maximum reaction temperature, in smaller scale foaming. 

Fig.6.2. Course of evolution of carbon dioxide from rye and clover plants in soil containing 18% moisture. (From Lockett, 1937.)...

For instance, the evolution of carbon dioxide from sodium bicarbonate solution may be measured (Oblad, Mills, and Milliken, 12). Similarly, the acceleration of the inversion of sucrose in the presence of a silica-alumina catalyst has been determined (12) Fig. 2. 

The similarity of the keto aldonic acids and uronic acids has been mentioned earlier. 2-Ketogluconic acid gives a 33 % yield of furfural in 4 hours and the 5-keto acid 42.5%, when heated with 12% hydrochloric acid ISO), The evolution of carbon dioxide from the 5-keto acid is quantitative. 

The most generally used method (Warburg manometric method) depends on the evolution of carbon dioxide from bicarbonate solutions when acetic acid is produced by hydrolysis of acetylcholine (3). The conversion of acetylcholine and certain other esters into the corresponding hy-droxamic acids when treated with hydroxylamine has been described by Hestrin (42) and a photometric method, depending on the ferric chloride reaction with acetic acid, has been reported by Abdon and Uvnas (1). A later report by Mitchell and Clark (61) involves the colorimetric measure-... 

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