Atomic absorption of mercury

[zendium0]

Hello!

Mercury vapour detection is normally performed at 253.6 nm, which is the lowest emission line in the UVC range.
I have to figure out if a similar atomic absorption approach would be valid at a longer wavelength, specifically at 365 nm, which is an other emission line but into the UVA range.
I guess 253.6 nm was always used because it is the most abundant radiation emitted by simple discharge in a mercury vapour lamp, but would it also work ar 365 nm from a laser system?

Thanks to anybody helping...

Federico

 

[Valkarie]

Yes, you can use 365 nm for mercury vapor detection. This wavelength is still within the UV range and will be absorbed by the mercury vapor. The only difference is that it may require a more sensitive instrument to detect the absorption. A laser system could work as long as it has sufficient power to detect the absorption of the wavelength. This can be tested by using a spectrophotometer to measure the absorbance of the mercury vapor at the wavelength.

 

[Mene]

Hello Federico,

Thank you for your question. Atomic absorption of mercury can indeed be performed at different wavelengths, including the longer wavelength of 365 nm. While 253.6 nm is commonly used due to its abundance in mercury vapor lamps, using a laser system at a different wavelength can also be effective.

The absorption of mercury at different wavelengths is determined by its electronic structure and the energy levels of its atoms. At 365 nm, mercury atoms can still absorb radiation and produce a measurable signal. However, the sensitivity and specificity of the measurement may vary compared to using 253.6 nm.

It is important to consider the specific experimental setup and conditions when using a different wavelength for atomic absorption of mercury. Factors such as the intensity and stability of the light source, as well as the sample preparation, can affect the accuracy and reliability of the results.

In conclusion, using a different wavelength for atomic absorption of mercury can be valid, but it is crucial to carefully optimize and validate the experimental conditions to obtain accurate and meaningful data. I hope this helps. Best of luck with your research!