A rapid instrumental method for the microdetermination of carbon and hydrogen in organic compounds

An autonomous optical method of determining the orientation of an Earth satellite in space: G.N. Krylovet al.: (pp. 145–153)

A coulometric method is described for the decimilligram determination of carbon and hydrogen in organic compounds which involves rapid combustion in a nitrogen stream. Carbon dioxide and water derived from the combustion are introduced into a Porapak T column for separation. Then the carbon dioxide is converted to the equivalent amount of water with a LiOH converter. These quantities of water are continuously swept into a diffusion type Pt-P2O5 electrolytic cell and determined coulometrically one after the other. The electrolysis current passing through the hygrometer is automatically integrated. The analysis time is 10–12 minutes and the absolute errors are within ±0.80% for carbon and ±0.67% for hydrogen.

Determination of carbon and hydrogen in organic compounds containing phosphorus and sulfur: A rapid semimicro method using silver permanganate

Microdetermination of carbon and hydrogen in organic compounds using flushed-oxygen combustion tube

An automatic, simple, and rapid coulometric method is proposed for the microdetermination of active hydrogen in organic compounds. The method is based on the reaction of active hydrogen with LiAlH4, combustion of the hydrogen formed to water, and measurement of the amount of electricity expended in its electrolysis.

An apparatus for accurate determination of carbon and hydrogen has been developed, based on a previously described coulometric Karl Fischer method for determination of small amounts of water in solids. Hydrogen and carbon in a sample are oxidized to water and carbon dioxide, respectively. The water is trapped first, and the carbon dioxide is converted into water by lithium hydroxide and determined in a coulometric cell. Then the water from the hydrogen is released and determined in the same cell. An alternative method for the determination of hydrogen alone with very high precision has also been developed. Samples weighing 0.1–5 mg can be analysed and the standard deviations obtained for a complete C, H determination are ±0.17% and ±0.08%, respectively. That for determination of hydrogen alone is ±0.009%.

The micro-determination of carbon and hydrogen in organic compounds containing phosphorus

Rapid micromethods of elemental analysis. III. Precise conlometric determination of hydrogen in organic compounds

New apparatus for rapid determination of carbon and hydrogen in organic compounds

(1854). XXVIII. On a general method of substituting iodine for hydrogen in organic compounds, and on the properties of iodopyromeconic acid. The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science: Vol. 8, No. 51, pp. 201-209.

Automatic apparatus for the determination of carbon and hydrogen in organic compounds

Analysis of carbon and hydrogen in organic compounds was carried out by the use of a novel porous copper oxide and porous silver as the reaction agents and the sample was heated rapidly in air stream flowing at the rate of 20-25cc./min., the air passing over copper oxide layer heated at 750-800° to effect oxidative combustion in a short period. Porous copper oxide has a large catalytic oxidative power in a small amount and porous silver hasa larg e absorbability for halogens and sulfur at a low temperature. Period required for one rapid analysis of carbon and hydrogen in organic compounds is 23-25 minutes.

Semimicro manometric method for the determination of carbon and hydrogen in organic compounds

Coulometric decimilligram determination of carbon and hydrogen in organic compounds

1. Halogen-containing organo-B, -P, and -Si compounds were used as preparations reacting with water vapor to form HCl for volumetric determination of hydrogen in organic compounds. 2. The possibility of volumetric micro-determination of carbon and hydrogen in organic substances after combusting them in a stream of oxygen in a tube mixed with phenylborondichloride, which forms hydrogen chloride with water vapor, was demonstrated.