EPA Method 515.1 Internal Standard Back Catalog number: 31023 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 92214 8082LCS / Matrix Spike Price on request 33091 p-Cresol Price on request 678398 alpha-Endosulfan, 100 µg/ml, Acetonitrile, 5ml Price on request