VISOCOLOR® HE Sulphite SU 100 • Titrimetric determination of sulphite • Titrimetric determination with addition of iodine solution and reverse titration of unused iodine with sodium thiosulphate. • Type: high sensitive titration kit (refill pack) • Range: 1 syringe is sufficient for 2 – 100 mg/l SO32– 1 gradation mark = 2 mg/l SO32– • Sufficient for: 100 tests with an average sulphite content of 100 mg/l SO32– • Shelf life at least: 3 years • Sea water suitability: yes • Detectable with PF-11: 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).