624B Internal / Surrogate Standard Back Catalog number: 98628 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended EPA-23CSAV Calibration Kit; Alternate Volume, 5 x 200ul, nonane Price on request MBP-188 2,2',3,4',5,6,6'-Heptachloro[13C12]biphenyl, 1.2ml x 50ug/ml, nonane Price on request 50779 Ammonia as NH3 Price on request