EPA Method 526 Surrogate Standard Back Catalog number: 93187 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 50767 Total Kjeldahl Nitrogen as N Price on request 79499 Diethyl ether Price on request 673246 Demeton-S-methyl, 10.0 µg/ml, Acetonitrile, 10ml Price on request