: Gold, silver, and iodide can interfere with the reduction process.
EPA Method 245.7 is a specialized analytical procedure used to determine mercury (
: 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 245.7z.001
However, based on the specific number , this often refers to EPA Method 245.7 , a high-precision protocol for measuring mercury levels in water. Below is a structured overview (essay) of this technical method. Overview of EPA Method 245.7: Mercury Detection
: 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 : Gold, silver, and iodide can interfere with
: The use of high-purity argon (99.998%) is mandatory; using nitrogen or air significantly reduces sensitivity.
) 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 Overview of EPA Method 245
: Stannous chloride is added to reduce these ions into elemental mercury vapor ( Hg0cap H g to the 0 power