Multi-Element Internal Standard / Back Catalog number: 53319 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 684531 D3-Ketoprofen, 100 µg/ml, Acetonitrile, 1ml Price on request 35004 EPA Method 502.2/524.2 Volatile Standard Price on request 90629 2-Methylnaphthalene Price on request