Question

Which method is used for the estimation of Phosphorous in organic compounds ?

• A. Duma's method
• B. Combustion method
• C. Kjeldahl's method
• D. Carius' method

Answer 1

The correct option is D Carius' method

The amount of phosphorus present in any organic compound is determined by Carius method.
Principle:The phosphorus present in an organic compound is oxidized to phosphoric acid by heating with fuming nitric acid. The phosphoric acid so obtained is precipitated as $MgN{H}_{4}P{O}_4,$ which on ignition is converted into $M{g}_2{P}_2{O}_7.$ From the mass of $M{g}_2{P}_2{O}_7,$ the mass of phosphorus present in the sample of the organic compound can be calculated.