EPA Method 1631 Mercury Calibration Standard from Mexico
A solution-based certified reference material containing known mercury concentrations at ppb levels, certified by EPA for validating ultra-trace mercury analysis methods. Classified under HTS 3822.90.00.00 due to its certification for regulatory compliance testing in water and environmental samples. Used to ensure accuracy in CVAFS and CVAAS instrumentation.
Duty Rate — Mexico → United States
10%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Include EPA method validation certificate and Certificate of Analysis; hazardous material declaration required for mercury content
• Verify shelf-life and stability data for customs valuation
• Register with TSCA for chemical import notification