CHEMetrics free sulfite kits can be used to measure thiosulfate. Multiply test results by 1.4 to convert from ppm sulfite (SO3) to ppm thiosulfate (S2O3). Please be aware that the sulfite kits cannot distinguish between thiosulfate and sulfite.
Alternatively, CHEMetrics K-9705 Thiosulfate Titrets Test Kit (5-50 ppm range) may be available for those customers who wish to order significant custom quantities. Please direct inquiries to our Technical Services team by emailing email@example.com.