245.7z.001 [2026 Release]

) 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

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.

The method relies on . Unlike traditional absorption methods, CVAFS measures the light emitted by excited mercury atoms. 245.7z.001

To maintain accuracy, analysts must manage several chemical interferences:

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 It typically operates within a calibration range of

: 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

: 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 To maintain accuracy, analysts must manage several chemical

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