EPA Method 8260B Surrogate Standard Back Catalog number: 23112 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 8481.22-500MG Diltiazem hydrochloride, neat, Solvent-neat, Unit 500mg, # of units-1, Cas.no. 33286-22-5 Price on request 2598.48-100MG Dicoronylene (mixture w/Coronylovalene), neat, Solvent-neat, Unit 100mg, # of units-1, Cas.no. 98570-53-7 Price on request 59427 Total Residual Free Chlorine (Cl) Price on request