The method relies on . Unlike traditional absorption methods, CVAFS measures the light emitted by excited mercury atoms.
EPA Method 245.7 is a specialized analytical procedure used to determine mercury ( 245.7z.001
: 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 The method relies on
) concentrations in various water sources, including drinking water, surface water, and industrial wastewater. It is favored for its high sensitivity, allowing for detection at parts-per-trillion levels. Technical Principles It is favored for its high sensitivity, allowing
: Stannous chloride is added to reduce these ions into elemental mercury vapor ( Hg0cap H g to the 0 power
: High-purity argon gas carries the vapor into the CVAFS analyzer , where it is exposed to UV light (253.7 nm), causing fluorescence that is then measured. Critical Interferences