: Samples are first treated with a brominating digestion (potassium bromate/bromide) to convert all mercury forms into mercuric ions ( Hg2+cap H g raised to the 2 plus power
: Stannous chloride is added to reduce these ions into elemental mercury vapor ( Hg0cap H g to the 0 power 245.7z.001
: Moisture and water vapor must be removed using drying tubes to prevent "quenching," which weakens the fluorescence signal. Application and Precision : Samples are first treated with a brominating
EPA Method 245.7 is a specialized analytical procedure used to determine mercury ( meaning laboratories can use different equipment
This method is performance-based, meaning laboratories can use different equipment, such as the PSA Millennium Merlin or Teledyne QuickTrace , provided they meet strict quality control standards. It typically operates within a calibration range of 5 ng/L to 100 ng/L.