EPA Method 552.1 - Surrogate Standard Back Catalog number: 31056 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended DF-A10-CS5,6,7,8, Individual Calibration Solutions, 200ul, nonane Price on request 11769.12-100-IO 2,3,3',4',5,5',6-Heptachlorobiphenyl ,100 µg/mL,isooctane,1mL, Price on request 73420 o-Tolualdehyde Price on request