Microdetermination of carbon and hydrogen Automatic combustion in a dynamic system

Our plain-English summary of Microdetermination of carbon and hydrogen Automatic combustion in a dynamic system, by N. Gel'man (Talanta, 1969).

The study

• Author: N. Gel'man
• Journal: Talanta
• Published: 1969;16(3):464-7
• Cited by: 1 article, as counted by NIH iCite
• Read it: PubMed · Publisher

Abstract

An automatic combustion method has been developed for organic and organo-metallic compounds (5-10 mg samples), based on "wide tube" dynamic combustion in a turbulent oxygen atmosphere. Hydrocarbons, carboranes, transition metal carboran complexes, highly fluorinated compounds, silanes, siloxanes and cyclosilazanes, fluoroderivatives of alkyl phosphinic acids, high polymers, etc. have been analysed by it. Silver-plated pumice, magnesium oxide, fibrous asbestos and crushed quartz were used to absorb interfering elements. Advantages over the manual procedure are simplicity of procedure, rapid combustion of difficultly combustible or highly volatile compounds, and better reproducibility of the results. The overall combustion cycle takes 15 min. The standard deviation for hydrogen is 0.01-0.15 % and for carbon is 0.10-0.23 % (carbon content 20-95 %).

In plain English

This short communication from the Institute of Elemental Organic Compounds in Moscow described an automatic combustion method used in measuring the carbon and hydrogen content of small (5-10 mg) samples of organic and organo-metallic compounds. It is a chemistry methods paper, not a study of asbestos exposure or disease. Samples were burned in a quartz container inside a tube through which oxygen flowed at 150-200 ml/min, with the container heated to 900-1000°. Fibrous asbestos appeared only as one of several materials used to absorb interfering elements, along with silver-plated pumice, magnesium oxide and crushed quartz. The author reported that organo-fluorine compounds were burned in the presence of magnesium oxide, and organo-silicon compounds in the presence of asbestos. The combustion unit, used for gravimetric determination of carbon and hydrogen, was tested on more than 3000 samples, and the full combustion cycle took 15 minutes. The standard deviation was reported as 0.01-0.15% for hydrogen and 0.10-0.23% for carbon, for compounds containing 20-95% carbon. The author concluded that the automatic combustion unit had considerable advantages over the manual method, including better reproducibility.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: Short communication describing a laboratory analytical chemistry method (automatic combustion for carbon and hydrogen determination); not a health study
• Who was studied: No human or animal population. The automatic combustion device was tested on more than 3000 samples of organic and organo-metallic compounds at the Institute of Elemental Organic Compounds, Academy of Sciences, Moscow.
• Exposure: No human exposure was studied. Fibrous asbestos was used as an absorbent for interfering elements during combustion, along with silver-plated pumice, magnesium oxide and crushed quartz. Organo-fluorine compounds were burned in the presence of magnesium oxide, and organo-silicon compounds in the presence of asbestos.
• Main results:
  • The standard deviation for hydrogen was 0.01-0.15% and for carbon was 0.10-0.23%, for compounds with carbon content of 20-95%
  • The overall combustion cycle took 15 minutes
  • Oxygen was passed through the combustion tube at 150-200 ml/min, and the container was heated to 900-1000°
  • The automatic combustion unit was used for the gravimetric determination of carbon and hydrogen
  • Statistical treatment of the results showed the absolute error to be within the usual limits
• The authors' conclusion: The author concluded that the automatic combustion unit had considerable advantages over the manual pyrolytic method. These included better reproducibility and rapid quantitative oxidation of compounds that resist combustion.

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