EPA Method 527 Surrogate Standard Back Catalog number: 95053 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 11792.23-100MG Basic green 4, chloride,neat,neat,100mg, Price on request 50462 Copper AA Standard (Cu) Price on request 20243 CLP Volatiles - Low Concentration Mix #2 Price on request