VISOCOLOR® ECO Sulphite • Titrimetric determination of Sulphite • Titrimetric determination with addition of iodine solution and reverse titration of unused iodine with sodium thiosulphate. • Oxidizing and reducing substances interfere. Type: titration test kit Range: 1 drop = 1 mg/L SO32- Sufficient for: 60 tests with an average sulphite concentration of 10 mg/L SO32- Shelf life at least: 1 year Sea water suitability: yes Detectable with PF-12: no • Sulphite ions are not present in natural unpolluted waters, however they often appear in large quantities in industrial waste waters (e. g. paper mills, dye works).