EPA Method 508 Surrogate Standard Back Catalog number: 19042 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 55161 SDWA Solids (Total Solids, TSS, & TDS) Price on request 50003 MA - EPH Aromatic Hydrocarbons Price on request 11764.12-100-IO 2,2',3,4,5,5',6-Heptachlorobiphenyl ,100 µg/mL,isooctane,1mL, Price on request