EPA Method 625 Base/Neutrals Mix #1 Back Catalog number: 19114 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 676328 Metoprolol tartrate, 250mg Price on request 678317 Mecoprop-1-octyl ester, 100 µg/ml, Acetone, 1ml Price on request EN-1948ES Extraction Standard Solution, in nonane/6.8% toluene, 1,2ml Price on request