EPA Method 502.2 Internal Standard Back Catalog number: 91703 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 79498 sec-Butanol Price on request 10893.10-100MG Sulfadiazine,neat,neat,100mg, Price on request XA20795000AL Fluoranthene, 100µg/mL in Acetonitrile, 1ml Price on request