EPA Method 531.1 Individual Analytes Back Catalog number: 31241 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 677421 1-Naphthol-4-sulfonic acid, 10mg Price on request 3466.7-100-CY Oxamyl Price on request 73332 trans-9-Octadecenoic acid Price on request