EPA Method 507 Surrogate Standard Back Catalog number: 19049 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 93939 Volatile Mix 1-B Price on request 95083 VOC Standard Price on request 9056.6-K-IP Tetrachlorocatechol , 1000µg/mL, Solvent-isopropanol, Unit 1mL, # of units-1, Cas.no. 1198-55-6 Price on request