EPA Method 524 & 624 - Internal Standard Back Catalog number: 19794 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 675425 5-(Hydroxymethyl)-2-furaldehyde, 100mg Price on request 71713 Citric acid Price on request 11133.8-10MG Tetrachlorophthalic anhydride,neat,neat,10mg, Price on request