EPA Method 552,552.1,552.2 Internal Std Back Catalog number: 30105 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 678531 Chlorpyrifos-methyl, 10 µg/ml, Acetone, 10ml Price on request 73680 2,3,5-Trimethylphenol Price on request 72302 4-Chlorobenzaldehyde Price on request