Internal Reference Standard Back Catalog number: 52187 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended DF-LCS-C40 Mass-Labelled PCDD/PCDF Solution/Mixture, 1.2ml, nonane Price on request 9002.21-100-ME Cortisol-9,11,12,12-d4, 100µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 73565-87-4 Price on request 3380.19-100-CY Diflufenican Price on request