EPA Method 552.1 - Surrogate Standard Back Catalog number: 31056 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended S4176UNL-0.05 25-Hydroxyvitamin D2, 50μg/ml, 1ml Price on request 673808 Dicamba-methyl ester, 100mg Price on request 59765 Potassium Chloride Modifier (K) Price on request