MA - EPH Matrix Spike Back Catalog number: 92113 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 19042 EPA Method 508 Surrogate Standard Price on request P-1034S Trinexapac-ethyl, 100µg/ml in MeOH, 1ml Price on request 677981 Parathion-ethyl, 100 µg/ml, Toluene, 1ml Price on request