scholarly journals XXXVIII.—On the mode of application of pettenkofer's process for the determination of carbonic acid in expired air

1880 ◽  
Vol 37 (0) ◽  
pp. 493-500
Author(s):  
William Marcet
Keyword(s):  
Carbonic Acid ◽  
Mode Of Application ◽  
Expired Air

scholarly journals XXIX.—On the Variations of the Amount of Carbonic Acid in the Ground-Air (Grund-Luft of Pettenkofer)

1895 ◽  
Vol 37 (3) ◽  
pp. 695-706
Author(s):  
C. Hunter Stewart
Keyword(s):  
Carbonic Acid ◽  
Point Of View ◽  
Modus Operandi ◽  
Chemical Examination ◽  
Short Account ◽  
The Subject ◽  
Organic Decomposition

The chemical examination of ground-air, i.e., the air which is contained in the pores of the soil, was first made by Boussingault and Levy in 1853. Their results, however, attracted little attention till Pettenkofer, in 1857, pointed out that the determination of the amount of carbonic acid in the air of a given soil might be used as a means of estimating the organic decomposition going on there. In 1871 he first published his results, and since that time the subject has been worked at by many investigators both from the agricultural and hygienic point of view, including in the latter class Fleck at Dresden, Eodor at Buda-Pesth, Hesse in Saxony, and Nicholls in America. As researches of this nature have not attracted much attention in this country, a short account of the modus operandi may be interesting as a preliminary.

III. Inquiries into the phenomena of respiration

1859 ◽  
Vol 9 ◽  
pp. 611-614 ◽  
Keyword(s):  
Carbonic Acid ◽  
Expired Air

The author gives in this communication the result of numerous inquiries into the quantity of carbonic acid expired, and of air inspired, with the rate of pulsation and respiration, —1st, in the whole of the twenty-four hours, with and without exertion and food; 2nd, the variations from day to day, and from season to season; and 3rd, the influence of some kinds of exertion. After a description of the apparatus employed by previous observers, he describes his own apparatus and method. This consists of a spirometer to measure the air inspired, capable of registering any number of cubic inches; and an analytical apparatus to abstract the carbonic acid and vapour from the expired air.

1. On a Modification of the Process for the determination of Nitrogen in Organic Compounds.

1857 ◽  
Vol 3 ◽  
pp. 126-130
Author(s):  
Alexander Kemp
Keyword(s):  
High Temperature ◽  
Organic Compounds ◽  
Organic Substance ◽  
Pure State ◽  
Carbonic Acid ◽  
Free State ◽  
Copper Chromate

Two methods are at present followed by chemists for the analysis of organic bodies containing nitrogen. In the first of these the nitrogen is directly separated from the substance, and measured in a pure state; while in the second method it is converted into ammonia, collected and weighed, its amount being calculated from the known composition of this latter substance.In accordance with the first-named mode of proceeding, the substance is burned at a high temperature, in contact with oxide of copper, chromate of lead, or some other body capable of yielding oxygen, when the carbon of the organic substance becomes converted into carbonic acid, and its hydrogen into water, while all the nitrogen is given off in a free state.

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