Exaxol 7 Component, Mixed Calibration Standard 4A in 5% HNO3, EPA 200.7

7-Component Mixed Calibration Standard 4A, EPA 200.7 by Exaxol, catalog numbers 74MX4A-100 and 74MX4A-500, is a 7-element mixed calibration standard in 5% nitric acid, formulated as calibration mix 4A for ICP-OES under EPA Method 200.7, including mercury. Available in 100 mL and 500 mL from MBP, a registered vendor to many research institutes across the USA.