To maintain accuracy, analysts must manage several chemical interferences:
: Gold, silver, and iodide can interfere with the reduction process.
) 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 245.7z.001
: Moisture and water vapor must be removed using drying tubes to prevent "quenching," which weakens the fluorescence signal. Application and Precision
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 To maintain accuracy, analysts must manage several chemical
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 ( Technical Principles : Moisture and water vapor must
: 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