Ultraviolet fluorescence (UVF) is employed for detecting sulfur dioxide (SO₂), a common contaminant regulated in EP gas monographs due to its reactivity and potential toxicity.
- Principle: SO₂ molecules absorb UV light and re-emit it at a longer wavelength. The intensity of this fluorescence correlates with SO₂ concentration.
- EP Use Case: Especially applicable for oxygen, carbon dioxide, and compressed air specifications where SO₂ must be controlled.
- Advantages: Exceptional specificity for sulfur compounds, low detection limits, and minimal interference.
