EPA Method 552 Internal Standard Back Catalog number: 30055 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 59979 Ammonia as (NH4+) Price on request 10775.24-50-T Bis(2-ethylhexyl)-3,4,6-tribromo phthalate,50 µg/mL ,toluene,1mL, Price on request 71376 Sulfolane Price on request