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Division 7 CALCULATON

United Kingdom

Original text. Later amendments are not shown.

The sulphide content of the sample, expressed as sulphur, as percentage by mass, is calculated by the following formula:

% sulphur = 32 n 1 x 1 - n 2 x 2 20 m

where:

n1

  • the number (in millilitres) of iodine standard solution (4.3) used,

    • x1

  • the molarity of this solution,

    • n2

  • the number (in millilitres) of the sodium thiosulphate standard solution (4.2),

    • x2

  • the molarity of this solution,

    • m

  • the mass (in grams) of the test sample.