EPA Method 524 & 624 - Internal Standard Back Catalog number: 19794 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended XA16085500CY Phorate-oxon-sulfone, 100µg/mL in Cyclohexane, 1ml Price on request 59914 Fluoride (F-) Price on request 682203 Fenoxaprop-P-ethyl, 10.0 µg/ml, Acetonitrile, 10 Price on request