Internal Standard for AB SIM Back Catalog number: 94516 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 71953 2-Propylthiophene Price on request 50130 Custom Anion Standard Price on request BDD-27/28 2,7/2,8-Dibromodibenzo-p-dioxin mix, 1.2ml x 50ug/ml, toluene Price on request