WS Disinfection By-Products - Cal Check 4 Back Catalog number: 93986 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 80911 EPA Method 8091Mix #2 Price on request 677217 gamma-HCH, 10 µg/ml, Acetonitrile, 10ml Price on request 2761.14-100-AN 3,3'-Dimethoxybenzidine,100 µg/mL,acetonitrile,1mL, Price on request