Custom Mix Back Catalog number: 50097 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 677301 Caffeine, 100 µg/ml, Methanol, 1ml Price on request L-PFUDS Sodium perfluoro-1-undecanesulfonate, 50µg/ml MeOH, 1,2ml Price on request PN-74S 1,2,3,4,5,6,8-Heptachloronaphthalene, 1.2mL x 50ug/mL, nonane Price on request