EPA Method 531.1 Individual Analytes Back Catalog number: 30041 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 53027 Alternate Interferents B Price on request 3807.12-K-IO Mono-n-butyl phthalate, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 131-70-4 Price on request 10614.2-100-MEX5 O,O-Dimethylhydrogenphosphate-13C2 , sodium salt Price on request