Erbium (Er) Back Catalog number: 57068 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 30070 EPA Method 502/524 Surrogate Standard #1 Price on request 72770 Terbufos sulfone, 1000µg/ml in MeOH, 1ml Price on request 95453 PCB Congeners & Hexachlorobenzene Mix #4 Price on request