Increase of the LIBS signal by electric field for Ca analysis in soils

RINALDI, CARLOS ALBERTO; BOGGIO ,NORBERTO GABRIEL; JUAN VOROBIOFF

Ciudad de México

Simposio; 41st Colloquium Spectroscopicum Internationale? (CSI XLI) and 1st Latin-American Meeting on Laser Induced Breakdown Spectroscopy (I LAMLIBS); 2019

Universidad Autónoma de México

The LIBS technique (Laser-Induced Breakdown Spectroscopy) is widely used for multielement analysis because it has a series of advantages such as rapid response, a minimum or no sample preparation treatment and a simple experimental setup . The sensitivity of the LIBS depends of the elements, and detection limits generally vary from a few to hundreds of ppm depending on the instrument. One of the limitations for the detection of elements by LIBS is the intensity of the signal. There are several ways to improve the LIBS emission. For example the use of multiple laser pulses , the introduction of buffer gas around in the plasma 1 and the application of a magnetic field 2. It has recently been shown that the addition of nanoparticles to metallic samples increases the amplitude of the emission lines by 1 to 2 orders of magnitude, improving the detection limit . Mayo et al. applied an electric field to measure the amount of mass extracted by pulse and also the application of an electric field produces more intense and sustained spectral lines over time. Following the ideas proposed by Mohamed A. Hairth et al. 3, in this work we developed a system to increase the signal intensity using a low power electric field.