EPA Method 8240A Internal Standard Back Catalog number: 22003 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 9444.11-100-AN Tokuthion Price on request 52058 Plasma Solution Method 200.7 section 7.6 Price on request 675388 Azinphos-ethyl, 100 µg/ml, Acetonitrile, 10ml Price on request