WP Total Hardness Back Catalog number: 54597 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 1729.15-K-IO 9-Methoxyphenanthrene, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 5085-74-5 Price on request 71127 EPA Method 418.1 - Total Petroleum Hydrocarbons Price on request 1278.16-5MG 2-Nitrofluoranthene, neat, Solvent-neat, Unit 5mg, # of units-1, Cas.no. 13177-29-2 Price on request