Photothermal Lens Spectroscopy for Detection of Metallic Impurities in Water

Document Type : Full length research Paper

Authors

1 Department of Physics, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran

2 Istituto Nazionale di Fisica Nucleare, Italy, Area Science Park, Padriciano 99, 34149 Trieste

3 Laboratory for Enviromental Research, University of Nova Gorica, Vipavska 13, Nova Gorica 5000, Slovenia

Abstract

In this paper, we studied the potential of photothermal lens spectroscopy technique in detection of trace amounts of contaminants in water. We used experimental setup with two continuum lasers as pump and probe beams. Different concentrations of iron ion solved in combination of 4 to 1 water to ethanol solvent was studied. To increase the technique sensitivity, lock-in amplifier and intensity modulation of the pump beam have been used. Also, the photothermal signal dependence on modulation frequency was investigated and the best working frequency according to signal enhancement and low standard deviation was 6 Hz. The obtained Limit of detection for doubly ionized iron at the optimum frequency was as low as 20 ng/L.

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References

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Journal of Research on Many-body Systems
Volume 9, Issue 4 - Serial Number 23
February 2020
Pages 69-75

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History

  • Receive Date: 02 January 2019
  • Revise Date: 12 November 2019
  • Accept Date: 31 December 2019

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