WS Disinfection By-Products - Cal Check Back Catalog number: 91837 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended DF-IS-B40 Mass-Labelled PCDD/PCDF Internal Standard Solution, 1.2ml, nonane Price on request 10070.56-5-05ME Homoyessotoxin, 5.0µmol/mL, Solvent-methanol, Unit 0.5mL, # of units-1, Cas.no. Price on request 92335 Anthracene-d10 Price on request