scholarly journals Recovery of submilligram quantities of carbon dioxide from gas streams by molecular sieve for subsequent determination of isotopic carbon-13 and carbon-14 natural abundances

1992 ◽  
Vol 64 (7) ◽  
pp. 824-827 ◽  
Author(s):  
James E. Bauer ◽  
Peter M. Williams ◽  
Ellen R. M. Druffel
Keyword(s):  
Carbon Dioxide ◽  
Molecular Sieve ◽  
Carbon 14 ◽  
Gas Streams ◽  
Subsequent Determination

Gas-Solid Chromatographic Determination of Oxygen, Nitrogen, Carbon Dioxide, Ethylene, and Nitrous Oxide at Ambient Temperature

1973 ◽  
Vol 56 (1) ◽  
pp. 119-123
Author(s):  
Martin J Finkelson
Keyword(s):  
Carbon Dioxide ◽  
Nitrous Oxide ◽  
Ambient Temperature ◽  
Molecular Sieve ◽  
Internal Standard ◽  
Chromatographic Determination ◽  
Digital Integrator ◽  
In Series ◽  
Peak Areas

Abstract A gas-solid chromatographic method is described for the separation and determination of 5 medicinal gases at ambient temperature, using 2 gas chromatographic columns, Porapak Q and Molecular Sieve 13X, operated in series with a 6-port thermal conductivity detector and I recorder. An electronic digital integrator is used for calculating peak areas. Data on retention time, linearity, reproducibility of injection, and comparison with absorption methods are presented. Analytical results for oxygen, nitrogen, carbon dioxide, ethylene, and nitrous oxide are attainable within 1.0% without the use of an internal standard.

Continuous Photometric Determination of Carbon Dioxide in Gas Streams

1952 ◽  
Vol 24 (10) ◽  
pp. 1541-1545 ◽  
Author(s):  
W. D. Maxon ◽  
M. J. Johnson
Keyword(s):  
Carbon Dioxide ◽  
Photometric Determination ◽  
Gas Streams

Determination of Carbon Dioxide in Continuous Gas Streams

1933 ◽  
Vol 5 (2) ◽  
pp. 114-118 ◽  
Author(s):  
William McK. Martin ◽  
Jesse R. Green
Keyword(s):  
Carbon Dioxide ◽  
Gas Streams

A CHEMICAL PROCEDURE FOR DETERMINATION OF THE C14-DISTRIBUTION IN LABELLED XYLOSE

1955 ◽  
Vol 33 (1) ◽  
pp. 368-373 ◽  
Author(s):  
Stewart A. Brown
Keyword(s):  
Carbon Dioxide ◽  
Formic Acid ◽  
Glycolic Acid ◽  
Periodic Acid ◽  
Glyoxylic Acid ◽  
Lead Tetraacetate ◽  
Carbon 14 ◽  
Chemical Procedure ◽  
Purified Salt

A series of reactions reported previously for the degradation of glucose has been modified and extended to permit the determination of carbon-14 in each of the five carbons of a single 2 mM. xylose sample. Methyl xylopyranoside was oxidized with periodic acid giving C-3 as formic acid, and a dialdehyde which was converted to strontium methoxy-diglycolate. The purified salt was hydrolyzed to glyoxylic and glycolic acids. The glyoxylic acid was isolated as the 2, 4-dinitrophenylhydrazone (C-1 + C-2) which was decarboxylated to give carbon dioxide from C-2. The glycolic acid was oxidized by lead tetraacetate to give C-4 as carbon dioxide and C-5 as formaldehyde. The activity in C-1 was determined by difference. The method was applied to xylose-1-C14, xylose-5-C14, and a biologically synthesized xylose sample with satisfactory results. This degradation procedure is theoretically applicable to other aldopentoses and aldotetroses.

A CHEMICAL PROCEDURE FOR DETERMINATION OF THE C14-DISTRIBUTION IN LABELLED XYLOSE

1955 ◽  
Vol 33 (3) ◽  
pp. 368-373 ◽  
Author(s):  
Stewart A. Brown
Keyword(s):  
Carbon Dioxide ◽  
Formic Acid ◽  
Glycolic Acid ◽  
Periodic Acid ◽  
Glyoxylic Acid ◽  
Lead Tetraacetate ◽  
Carbon 14 ◽  
Chemical Procedure ◽  
Purified Salt

A series of reactions reported previously for the degradation of glucose has been modified and extended to permit the determination of carbon-14 in each of the five carbons of a single 2 mM. xylose sample. Methyl xylopyranoside was oxidized with periodic acid giving C-3 as formic acid, and a dialdehyde which was converted to strontium methoxy-diglycolate. The purified salt was hydrolyzed to glyoxylic and glycolic acids. The glyoxylic acid was isolated as the 2, 4-dinitrophenylhydrazone (C-1 + C-2) which was decarboxylated to give carbon dioxide from C-2. The glycolic acid was oxidized by lead tetraacetate to give C-4 as carbon dioxide and C-5 as formaldehyde. The activity in C-1 was determined by difference. The method was applied to xylose-1-C14, xylose-5-C14, and a biologically synthesized xylose sample with satisfactory results. This degradation procedure is theoretically applicable to other aldopentoses and aldotetroses.

Determination of Zinc Phosphide and Its Stability in Rodent Baits

1969 ◽  
Vol 52 (3) ◽  
pp. 662-666
Author(s):  
G O Guerrant ◽  
J W Miles
Keyword(s):  
Carbon Dioxide ◽  
Hydrochloric Acid ◽  
Zinc Phosphide ◽  
Rodent Control ◽  
Improved Method ◽  
Carbon Dioxide Atmosphere ◽  
Subsequent Determination

Abstract An improved method for determining zinc phosphide has been developed that employs liberation of phosphine by refluxing with hydrochloric acid with subsequent determination by the alkalimetric quimociac phosphorus method. Zinc phosphide was found to he relatively stable when used on apple and potato baits for rodent control, with over 70% of the activity remaining after 99-day exposure under simulated baiting conditions. Decomposition occurs more rapidly in the juices of the moist surface of freshly prepared bait than on the dried baits. Decomposition is slow in a carbon dioxide atmosphere and is accelerated by moisture.

Determination of Carbon Dioxide in Gas Streams

1957 ◽  
Vol 29 (12) ◽  
pp. 1854-1856 ◽  
Author(s):  
P. E. Toren ◽  
B. J. Heinrich
Keyword(s):  
Carbon Dioxide ◽  
Gas Streams
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