EPA Method 508 Surrogate Standard Back Catalog number: 19042 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 94040 Organic Acid Standard Price on request 675106 Sodium p-n-dodecylbenzenesulfonate, 100 µg/ml, Me Price on request 681813 D4-Ethylene thiourea, 10mg Price on request