EPA Method 8021B Internal Standard Back Catalog number: 19394 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 8848.9-K-IO 2-Ethoxy-3-isopropylpyrazine, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-, Cas.no. Price on request 98859 Formaldehyde-DNPH Level 2 (0.5ug/mL) Price on request 72603 Fluoxetine, 1000µg/ml in MeOH, 1ml Price on request