02-519rISOrLiquid medium for the determination of H2S production by Clostridium perfringens according to ISO 7937 standard. This medium you need supplements:r- Sodium disulphite Selective Supplement (Art. No.: 06-114LYO1): 1 vial per 500ml of medium.r- Ammonium Ferric Citrate Supplement (312 mg) (Art. No.: 06-113LYO1): 1 vial per 500ml medium.