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Nomenclature and General Principles: Quantitative Analysis: Estimation of Nitrogen

Quantitative Analysis

Estimation of Nitrogen

Dumas Method

A known mass of compound is heated with copper oxide , in an atmosphere of , which gives free nitrogen along with and .

  • The gaseous mixture is passed over a heated copper gauze which converts traces of nitrogen oxides formed to .
  • The gaseous mixture is collected over an aqueous solution of which absorbs and nitrogen is collected in the upper part of the graduated tube (Fig) .
Illustration: Dumas Method

Let the volume of collected be ml

Volume of at

of at

Percentage of

Estimation of Oxygen

First Method

It can be found by the difference between the total percentage composition (100) and sum of the percentages of all the other element. e. g. Percentage of

Second Method (Aluise՚s Method)

A known mass of compound is decomposed by heating it in the presence of gas.

The mixture of gaseous products containing is passed over red-hot coke when all the is converted to .

This mixture is heated with (iodine pentoxide) in which is oxidised to liberating

Organic compound other gaseous product

Percentage of

CHN Element Analyzer

  • The element C, H and N present in an organic compound are determined by an automatic instrument called elemental analyser using a very small amount of the compound.
  • This display the result in a very short time.