EPA Method 525 Internals & Surrogates Back Catalog number: 91161 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended S-4058 Dibenzothiophene in Xylene S-4058 1000 µg/mL, 5x1mL ampoules Please request for diluted samples in the range 1 to 1000mg/mL. Price on request 11470.8-1G Phthalic-3,4,5,6-d4 acid,neat,neat,1g, Price on request 675864 2-Methylhippuric acid, 100mg Price on request