EPA Method 524 & 624 - Internal Standard Back Catalog number: 19794 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended T296125 3,5,3’,5’-Tetraiodo Thyroacetic Acid, 50mg Price on request 63174 2,2',3,3',4,5,6'-Heptachlorobiphenyl (174) Price on request 79328 Hexachlorocyclopentadiene Price on request