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Extending the Applicability of Laser-Induced Breakdown Spectroscopy for Total Soil Carbon Measurement

^a Earth and Environmental Science Division, Los Alamos National Laboratory, Los Alamos, NM 87545
^b USDA NRCS Soil Quality Institute, 411 South Donahue Drive, Auburn, AL 36832
^c Chemistry Divison, Los Alamos National Laboratory, Los Alamos, NM 87545
^d Bioscience Division, B-3, MS E529, Los Alamos National Laboratory, Los Alamos, NM 87545

View larger version (22K): [in a new window]   Fig. 1. (A) Region of laser-induced breakdown spectroscopy (LIBS) spectrum from 245 to 250 nm showing C and Fe interferences at approximately 248 nm. The line intensity of C cannot be quantified independently from the Fe line, and this interference increases as Fe concentration increases. (B) Region of LIBS spectrum showing C line at 193 nm, Al at 199 nm, and Si at 212 nm. The C line is easily quantified without interference from other elements. Aluminum and Si lines were also easily quantified and were used as standardizing factors.

View larger version (19K): [in a new window]   Fig. 2. (A) Calibration of laser-induced breakdown spectroscopy (LIBS) using data from the calibration set soils (r2 = 0.99, p < 0.001; n = 6). Quantitative data from the ratio, C/(Al + Si), of C line at 193 nm to the sum of the Al line at 199 nm and Si line at 212 nm. (B) Plot of the LIBS data from the verification set of the Colorado soils (r2 = 0.95, p < 0.001; n = 12; two points nearly coincident). Slopes of calibrations curves plotted each of 30 d were not significantly different.