ISO 622:2025

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Coal and coke - Determination of phosphorus - Reduced molybdophosphate photometric method

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ISO 622:2025

Coal and coke - Determination of phosphorus - Reduced molybdophosphate photometric method

PUBLISH DATE 2025
ISO 622:2025

This document specifies a reduced molybdophosphate photometric method for the determination of the total phosphorus mass fraction of hard coal, lignites and coke.

Two methods for taking the phosphorus into solution are specified, namely:

  • extraction from the coal or coke ash with acid
  • repeated oxidation of the coal or coke, by acid, to remove carbonaceous matter
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