Fast spark discharge-laser-induced breakdown spectroscopy method for rice botanic origin determination

Atomic spectrometry update: review of advances in the analysis of clinical and biological materials, foods and beverages

“…Therefore, the ‘data fusion’ approach was implemented and the optimised weighted model achieved 100% accuracy even for samples that were previously difficult to differentiate by the individual techniques. Perez-Rodriguez et al 104 described the application of spark discharge LIBS for the origin identification of rice. Four rice genotypes, namely Guri, Irga 424, Puita, and Taim, were selected and 72 samples were collected from the Corrientes province in Argentina.…”

“…In the second work, alternative analytical methods were used to assess the botanic origins of rice. 104 Spark discharge-LIBS was applied to measure the content of C, Ca, Fe, Mg, N and Na in 72 samples from four rice varieties. This information was then analysed using SVM, with the algorithm parameters optimised using a central composite design to find the best classification performance.…”

Theoretical study on signal enhancement of orthogonal double pulse induced plasma

“…However, its detection sensitivity is poor, especially the detection limits of several elements are difficult to meet the application requirements of trace analysis. 10 In order to improve the detection sensitivity of LIBS, a variety of auxiliary spectral enhancement techniques have been developed in recent years, including double/multi-pulse re-excitation, [11][12][13][14][15][16] discharge/ microwave assisted enhancement, 17,18 space/magnetic eld constrained plasma, 19,20 laser-induced uorescence, 21,22 etc. Among them, DP-LIBS is the most widely used technique in enhancing the spectrum by re-exciting the plasma with a secondary laser pulse.…”

Spark Discharge-LIBS: Evaluation Of One-Point And Multi-Voltage Calibration For P And Al Determination

“…[2][3][4] Among several approaches attempted to achieve LIBS signal enhancement, 2,3,5,6 spark discharge (SD) was found to be simple and relatively low-cost. 7 Since its first proposal in 1962, 7 SD-LIBS has been used to analyze a variety of samples 8 in various sectors of agriculture 9 , such as soil, [10][11][12][13][14][15][16][17] phosphate rock, 10,18 rice, 19 honey, 20 coal 21,22 and onion leaves. 23 For instance, when using the SD method, the signal-to-background (S/B) ratio increased up to 7 times in the analysis of Pb and As in soil, 11 up to 3 times for As, Al, Ba, Ca, Co, Fe, Mg, Pb, Si, Sr, Ti and V in soil, 13 and up to 12 times for P in fertilizer.…”

“…An increase of the emission intensities as a function of the applied voltage was observed in the SD-LIBS analysis of Al and Cu in air, 34 As, Pb, Si and Mn in soil, 11,35 Si in silicon crystals, 36 P in fertilizers 18 and Pb and Fe in copper alloys. 37 Quantitative analysis by SD-LIBS usually employs calibration with a fixed single voltage and standards at various concentrations, [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] whereas the use of a single standard and various applied voltages has rarely been reported in the literature.…”