The actual concentration is determined by adding an excess of iodine to an aliquot of the solution and back titrating with standardized sodium thiosulphate solution (see Annex B).
allowing Member States to extend provisional authorisations granted for the new active substances amisulbrom, chlorantraniliprole, meptyldinocap, pinoxaden, silver thiosulphate and tembotrione
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Elemental sulphur is converted in an alkaline medium into polysulphides and thiosulphate; these, together with any sulphites which may be present, are then oxidised with hydrogen peroxide.
Titrate the liberated iodine with the sodium thiosulphate solution ►C1 (6.4) (0,002 Mol/L solution for expected values less than 12, and 0,01 Mol/L solution ◄ for expected values above 12) shaking vigorously, using starch solution (6.5) as indicator.
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Add an additional 3.0 ml of 0.1 N iodine, allow to stand for 10 minutes and titrate the excess iodine with 0.1 N sodium thiosulphate, adding 3 ml of starch TS as the end point is approached.
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After this, it is left standing for half an hour, then the liberated iodine is titrated with a decinormal solution of sodium thiosulphate, no indicator being added; complete discolouration indicates the end of the reaction.