EPA Method 524 & 624 - Internal Standard Back Catalog number: 19794 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 11932-10-50-AN N-?Methylperfluorooctanesulfo?namide,50 µg/mL,acetonitrile,1mL, Price on request 73431 4-Amino-2-chlorophenol Price on request 72724 Heptaldehyde, 1000µg/ml in Acetone, 1ml Price on request