EPA Method 531.1 - Analytes Mixture Back Catalog number: 33042 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 675553 Chlorthiophos, 10.0 µg/ml, Ethyl acetate, 10ml Price on request 678398 alpha-Endosulfan, 100 µg/ml, Acetonitrile, 5ml Price on request 11618.24-100-ME Spironolactone,100 µg/mL,MeOH,1mL, Price on request