Internal & Surrogate Standard 8260B Back Catalog number: 96719 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 9281.22-K-ME Tadalafil, 1000µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 171596-29-5 Price on request 94306 HPLC Standard Price on request 82415 EPA Method 8240A - Ketones Price on request