Identification of metal elements by time-resolved LIBS technique in sediments lake the "Cisne"

2nd Colombian Congress of Electrochemistry; 2nd Symposium on Nanoscience and Nanotechnology

物理学;化学

Pacheco, P.^1 ; Arregui, E.^1 ; Álvarez, J.^1 ; Rangel, N.^1 ; Sarmiento, R.^1

Universidad Del Atlántico, Barranquilla, Colombia^1

关键词: Conventional techniques;    Echelle spectrograph;    Energy per pulse;    Excitation sources;    Laserinduced breakdown spectroscopy (LIBS);    Metal pollutants;    Positioning system;    Simultaneous analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/786/1/012008/pdf
DOI  :  10.1088/1742-6596/786/1/012008

来源: IOP

【 摘 要 】

Laser induced breakdown spectroscopy (LIBS), is a kind of spectral method of atomic emission that uses pulses of radiation high energy laser as excitation source. One of the advantages of technical LIBS lies in the possibility of analyse the substances in any State of aggregation, already is solid, liquid or gaseous, even in colloids as aerosols, gels and others. Another advantage over other conventional techniques is the simultaneous analysis of elements present in a sample of multielement. This work is made in the use of this technique for the identification of metal pollutants in the Swan Lake sediment samples, collected by drilling cores. Plasmas were generated by focusing the radiation of Nd: YAG laser with an energy per pulse 13mJ and 4ns duration, wavelength of 532nm. The spectra of radiation from the plasmas of sediment were recorded with an Echelle spectrograph type coupled to an ICCD camera. The delay times were between 0.5μs and 7μs, while the gate width was of 2μs. To ensure the homogeneity of the plasmas, the sediment sample was placed in a positioning system of linear and rotary adjustment of smooth step synchronized with the trigger of the laser pulse. The registration of the spectra of the sediment to different times of delay, allowed to identify the lines prominent of the different elements present in the sample. The analysis of the Spectra allowed the identification of some elements in the sample as if, Ca, Na, Mg, and Al through the measurement of wavelengths of the prominent peaks.