EPA Method 524 & 624 - Internal Standard Back Catalog number: 19794 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 83582 Chloramben Price on request 59344 Perchlorate (ClO4-), 100µg/mL in Water, 100ml Price on request 31022 2,4-Dichlorophenylacetic acid Price on request