EPA Method 531.1 Individual Analytes Back Catalog number: 31241 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended HPCB-5002N 2-Hydroxy-2',3',5,5',6'-pentachlorobiphenyl, 10mg Price on request 11171.17-10-MG Dextrorphan tartrate,neat,neat,10mg Price on request 54259 Nitrite (NO2-) as N, 100µg/ml in Water, 100ml Price on request