Sample Collection
Dissolved samples are filtered and acid preserved. Total‑recoverable samples are collected for digestion; low‑turbidity drinking water may be direct analyzed with proper modifiers.
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GFAA
US EPA Method 200.9
Overview of "Determination of Trace Elements by Stabilized Temperature Graphite Furnace Atomic Absorption"
US EPA Method 200.9 defines procedures for dissolved and total recoverable elements by GFAA in drinking water, groundwater, surface water, storm runoff, industrial/domestic wastewater, and solids. The method covers 16 elements and details matrix modifiers, furnace programs, calibration and quality-control requirements.
End-to-End Analytical Process
Sample Preparation
Particulate aqueous and solid samples are gently refluxed with HNO₃ + HCl. Dissolved or low‑turbidity samples may need only acid dilution before analysis.
Analysis & Maintenance
Prepared samples are measured by stabilized‑temperature platform GFAA with calibration, blanks, matrix modifiers, QC checks, and interference control.