EPA Method 8260B Internal Standard Back Catalog number: 22213 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended B2430 1,2-Benzisothiazol-3(2H)-one, >98%, 25g Price on request 72031 Theophylline Price on request 92429 EPA Method 610/8310 Analytes Price on request