EPA Method 509 Internal Standard Back Catalog number: 30097 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 79279 cis-Chlordane Price on request 98861 Formaldehyde-DNPH Level 4 (2ug/mL) Price on request 3428.12-100-CY Isofenphos-des-N-isopropyl Price on request