Abstract

Soil carbon sequestration is one approach to mitigate greenhouse gases. However, to reliably assess the quantities sequestered of carbon in several productive systems, new methods and equipment for large scale determination are needed. Laser-induced breakdown spectroscopy (LIBS) is a well-known analytical technique to analyses of solid, liquid, gaseous and aerosol samples. Furthermore, the interest in this technique has grown because it does not require chemical treatment for sample preparation, thus LIBS technique can be considered environmentally clean, without chemical waste. However, it shows a lower sensitivity when compared to other spectrometric methods. One way to overcome this limitation is to use a double pulse (DP) configuration. Few papers are found in the literature using DP systems in the analysis of soils. This study aimed to build and characterization of an apparatus DP-LIBS for the soil study. The soils samples were collected from two different Brazilian regions, North (Amazon) and Southeast (Sao Paulo). Tropical soils have large amounts of iron and aluminum in their compositions, so the main carbon lines in 247.86 nm and 193.03 nm, respectively, endures strong interference of these elements. A comparative study between conventional (single pulse) LIBS and DP-LIBS was performed. Also, the influence of the excitation wavelength on the ablation and re-heating were compared. Two different Nd:YAG lasers operating at the wavelength 532 nm and 1064 nm (IR), respectively, were used and the total Carbon and some micronutrients of the soil were investigated. The collinear DP-LIBS system built enhanced the intensity of emission lines of these elements more than twice, when compared with conventional single pulse LIBS, and reduced the continuum emission. Preferably the IR laser was indicated to re-heating of the plasma. In general, DP-LIBS improved the analytical performances of the technique.

Autore Pugliese

• Senesi Giorgio Saverio

Tutti gli autori

• G. Nicolodelli; I.L. Perazzoli Jader Cabral; B.S. Marangoni; G.S. Senesi; A. Segnini; C.R. Montes; D.M.B.P. Milori

Titolo volume/Rivista

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Anno di pubblicazione

2014

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Settori ERC

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