EPA Method 508 Surrogate Standard Back Catalog number: 19042 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 11617.63-100MG Cyanocobalamine, 98% (dry weight basis),neat,neat,100mg, Price on request 11203.8-50-MEX10 1D,1D,2H,2H-1-Hydroxyperfluorooctane,50 µg/mL,MeOH,1mL, Price on request 11223.10-100-AN Bentazon-d7 (isopropyl-d7),100 µg/mL,acetonitrile,1mL, Price on request