EPA Method 551.1 Surrogate Standard Back Catalog number: 30102 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 13400-3240-100ME5 4-n-Nonylphenol, 100µg/ml in MeOH, 5ml Price on request 96175 Caffeine Price on request 51179 GRO Standard - TN & MS Price on request