Application of laser-induced breakdown spectrometry for direct determination of trace elements in starch-based flours

Cho, Hyo-Hyun; Kim, Young‐Ju; Jo, Young-Soo; Kitagawa, Kuniyuki; Arai, Norio; Lee, Yong‐Ill

doi:10.1039/b100754h

Cited by 55 publications

(21 citation statements)

References 28 publications

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“…Further experiments are necessary to determine the best approach. It is also worth noting that the scatter in the data observed here is significantly larger than that reported in previous studies [6,9,10], which may be related to the relatively weak laser pulse energy (10 mJ) employed in the present study compared to those used in other studies (100-350 mJ) [6,9,10]. Greater laser pulse energies consume more sample matter per laser pulse to somewhat mitigate microscale inhomogeneities in the sample and can also benefit from more stable plasma formation.…”

Section: Key Resultscontrasting

confidence: 54%

“…It was found that a gate delay of 1 μs and an integration time of 10 μs provided the optimum signal to noise ratio and that the coefficient of variation of measurements was approximately 8-15%. Cho et al [6] mixed starch powder or NIES samples with 50% (w/w) to improve sample rigidity for optimal plasma formation and used the Mg line at 279.553 nm and the K line at 766.49 nm to determine concentrations of those elements with detection limits of 0.4 and 3 μg/g for Mg and K, respectively.…”

Section: Figure 1 Laser-induced Breakdown Spectroscopy (Libs) Measurmentioning

confidence: 99%

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Feedstock Quality Factor Calibration and Data Model Development

Boardman¹,

Westover²,

Gresham³

2010

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Objective:The goal of the feedstock assembly operation is to deliver uniform, quality-assured feedstock materials that will enhance downstream system performance by avoiding problems in the conversion equipment. In order to achieve this goal, there is a need for rapid screening tools and methodologies for assessing the thermochemical quality characteristics of biomass feedstock through the assembly process. Laser-induced breakdown spectroscopy (LIBS) has been identified as potential technique that could allow rapid elemental analyses of the inorganic content of biomass feedstocks; and consequently, would complement the carbohydrate data provided by near-infrared spectrometry (NIRS). These constituents, including Si, K, Ca, Na, S, P, Cl, Mg, Fe and Al, create a number of downstream problems in thermochemical processes. In particular, they reduce the energy content of the feedstock, influence reaction pathways, contribute to fouling and corrosion within systems, poison catalysts, and impact waste streams. Expected Outcome:The mineral content and composition is recognized as both a barrier to the use of some feedstocks and as a quality attribute that may be controlled through the feedstock assembly process. The inorganic content of biomass feedstocks is known to vary over wide ranges, depending upon the plant type and anatomical fraction, growing conditions, harvesting time and method, and handling operations. If this task is successful in developing a cost-effective screening tool, there may be opportunities for selecting and blending diverse feedstocks to produce on-spec materials that will in turn, reduce the capital and maintenance costs associated with syngas cleaning and replacing components in conversion platforms. Progress:Scoping studies have been conducted with the instrumentation in order to establish the feasibility of using the LIBS technique as a feedstock screening tool and to determine the optimal system operational parameters. These parameters include identifying the most sensitive, interference-free analytical lines for key elements and the laser ablation pulse parameters for sampling the materials. The sensitivity of the analytical lines to changes in elemental concentrations over ranges of interest has been benchmarked against independent analytical analyses conducted by Hazen Research Inc.

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Section: Key Resultscontrasting

confidence: 54%

Section: Figure 1 Laser-induced Breakdown Spectroscopy (Libs) Measurmentioning

confidence: 99%

Feedstock Quality Factor Calibration and Data Model Development

Boardman¹,

Westover²,

Gresham³

2010

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“…The effect of spot size, laser repetition rate, laser energy, number of laser pulses and delay time on the analytical results were checked by the monitoring of an integrated area of atomic/ionic emission peaks and the signal background ratio (SBR). Besides influence of vertical distance above sample surface and pressure of surrounding gas are also important instrumental parameters [15], the instrument used in this work does not allow their optimization. At least two emission wavelengths were evaluated for each element; however, as their behavior was similar, only K(I) 766.49 and Mg(II) 279.553 nm were used.…”

Section: Libs Instrumental Optimizationmentioning

confidence: 99%

“…In the absence of an internal standard, the ratios between slopes are close to 2, indicating that spiked filter paper or spiked babassu mesocarp cannot be used in wood analysis. Due to this kind of interference, most relevant papers [10,[15][16][17] have used the LIBS method of calibration using a sample matrix spiked with an increasing concentration of analytes or dilution using appropriate materials. These results are in accordance to Sun et al [18] which proposed the measurement of Mn, Zn, P, Fe and Cu in plant materials by LIBS.…”

Section: Calibration Of System Libsmentioning

confidence: 99%

Feasibility study of calibration strategy for direct quantitative measurement of K and Mg in plant material by laser-induced breakdown spectrometry

Silvestre

Barbosa

Aguiar

et al. 2015

Analytical Chemistry Research

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a b s t r a c tThe calibration and quantitative measurement is the ''Achilles heel'' of the LIBS technique. This paper deals with a method developed for the direct measurement of K and Mg in plant samples. Instrumental parameters were optimized and the best condition found was a 50 lm spot size, 10 Hz laser repetition rate, 75 accumulated laser pulses with 25 mJ/pulse and 0.25 ls of delay time. For method calibration, the use of synthetic standard calibrating material prepared by the addition of increasing concentrations of K and Mg in wood, filter paper and babassu mesocarp was proposed in order to assess the feasibility of using these various matrices in plant samples analysis. The limits of detection of proposed method were 2-30 and 6-27 lg g À1 for K and Mg, respectively. The use of the carbon emission wavelength at 247.856 nm was used as internal standard to improve the analytical results. Certified reference materials of plants were used to check the accuracy of the proposed method and recovery around 82% and 100% were obtained in all cases. Ó 2015 Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http:// creativecommons.org/licenses/by-nc-nd/4.0/).

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“…LIBS is a method in which elemental analysis of any kind of sample (Rosenwasser et al 2001;Cho et al 2007;Samek et al 2000;Rai et al 2002) even having heterogeneous composition can be easily done with minimal disturbance. LIBS works by firing an intense pulse of laser light on the sample surface.…”

Section: Introductionmentioning

confidence: 99%

Screening of brick-kiln area soil for determination of heavy metal Pb using LIBS

Pandhija

Shukla

2008

Environ Monit Assess

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Rapid measurement of heavy metals in soil is an important factor in modeling the effect of industrial pollution on agricultural soil. Conventional methods of heavy metal analysis are relatively slow in terms of measurement/analysis time and sample preparation time with the requirement of skilled manpower. Our results highlight the quantitative analysis of toxic metal lead (Pb), for the first time, in an Indian agricultural soil, in the vicinity of brick-kiln area, Phaphamau, near Allahabad, India, by using a novel technique named as Laser-induced breakdown spectroscopy (LIBS). LIBS spectra of soil has been recorded in the wavelength range from ultraviolet (UV) to infrared region (200-1,100 nm). The suitability of Pb lines for drawing the calibration curve is checked and realized, for the first time, that 220.3 nm, which is observed in the UV region of LIBS spectra, is completely interference free and best suited for the quantification of trace amount of Pb in soil instead of any other Pb lines, because it has best linear regression coefficient and smallest standard deviation of the background signal. In the present work the detection limit for Pb in soil is found to be 45 ppm. Based on the present work the concentration of Pb in agricultural soil of brick-kiln area in Phaphamau is found to be congruent with 570 ppm, which is more than the regulatory standards imposed by US Environmental Protection Agency (400 ppm) for the presence of lead in soil, therefore, it is of great concern to us.

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Application of laser-induced breakdown spectrometry for direct determination of trace elements in starch-based flours

Cited by 55 publications

References 28 publications

Feedstock Quality Factor Calibration and Data Model Development

Feedstock Quality Factor Calibration and Data Model Development

Feasibility study of calibration strategy for direct quantitative measurement of K and Mg in plant material by laser-induced breakdown spectrometry

Screening of brick-kiln area soil for determination of heavy metal Pb using LIBS

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