Method 200.8/1638/1640 Internal Standard Back Catalog number: 53145 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 50012 Multi-Element Calibration Standard-2A Price on request 679460 2,4'-DDT, 100 µg/ml, Methanol, 1ml Price on request 679663 4-Dimethylaminoantipyrine, 250mg Price on request