pH 5.0 Standard @ 25°C

2-(Phenylthio)thiophene, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 16718-12-0

Cyanuric acid, 100µg/mL in Water, 1,2ml

1-Hydroxybenzotriazole monohydrate, 100mg