EPA Method 8260B Internal Standard Back Catalog number: 22213 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 11135.9-100-IO Isopropylphenyl phosphate (monoisopropylmonophenyl phosphate),100 µg/mL,isooctane,1mL, Price on request 94751 3,3’-Dimethylbenzidine Price on request 30020 EPA Method 508A DCB Stock Solution Price on request