EPA Method 537 Analyte Primary Dilution Standard (linear isomers only), 1.2ml, methanol Back Catalog number: EPA-537PDSL-R1 Availability: In the manufacturer's stock Price on request - + Recommended 681386 Paraoxon-ethyl, 100mg Price on request Z273000 trans-Zeatin, 50mg Price on request 90911 2,6-Dinitrotoluene Price on request