Determination of iron in water solution by time-resolved femtosecond laser-induced breakdown spectroscopy


2015

Голик С. С., Ильин А. А., Golik, S.S., Ilyin, A.A., Babiy, M.Y., Biryukova, Y.S., Lisitsa, V.V., Bukin, O.A.

Статьи в журналах

Plasma Science and Technology

Institute of Physics Publishing

Volume 17, Issue 11, November 2015, Pages 975-978

Volume 17, Issue 11, November 2015, Pages 975-978

0.66

The influence of the energy of femtosecond laser pulses on the intensity of Fe I (371.99 nm) emission line and the continuous spectrum of the plasma generated on the surface of Fe3+ water solution by a Ti: sapphire laser radiation with pulse duration < 45 fs and energies up to 7 mJ is determined. A calibration curve was obtained for Fe3+ concentration range from 0.5 g/L to the limit of detection in water solution, and its saturation was detected for concentrations above 0.25 g/L, which is ascribed to self-absorption. The 3σ- limit of detection obtained for Fe in water solution is 2.6 mg/L in the case of 7 mJ laser pulse energy. It is found that an increase of laser pulse energy insignificantly affects on LOD in the time-resolved LIBS and leads to a slight improvement of the limit of detection.