EPA Method 552 Internal Standard Back Catalog number: 30055 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 93061 Phenanthrene - 80% Price on request 92332 Resource Exploration Standard #2 Price on request 675108 Sodium p-n-tetradecylbenzenesulfonate, 100 µg/ml, Price on request