Internal Reference Standard Back Catalog number: 52187 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 679375 Chlorpyrifos-methyl, 10.0 µg/ml, Cyclohexane, 10 Price on request 31531 p-Xylene Price on request 10584.24-K-ME Bis(tri-n-butyltin)oxide Price on request