Method 200.8/1638/1640 Internal Standard Back Catalog number: 53145 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 0201.18-200-T Benz[a]anthracene, 200µg/mL, Solvent-toluene, Unit 1mL, # of units-1, Cas.no. 56-55-3 Price on request XA13920000AL Formothion, 100µg/ml in Acetonitrile Price on request 66176 2,2',3,3',4,6,6'-Heptachlorobiphenyl Price on request