Laser-induced breakdown spectroscopy for determination of trace metals in aqueous solution using bamboo charcoal as a solid-phase extraction adsorbent

Zhu, Dehua; Chen, Jianping; Lü, Jian; Ni, Xiaowu

doi:10.1039/c2ay05675e

Cited by 55 publications

(26 citation statements)

References 36 publications

(33 reference statements)

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“…Plasma formation on flowing jet liquids [3][4][5], inside bubbles [6], on liquid droplets [7][8], on aerosols formed by nebulization [9,10] or by electro-spray ionization [11,12], on samples in which physical conditions are changed by freezing [13,14] or by chemical derivatization [15][16][17][18], liquids adsorbed on solid substrates [19][20][21][22][23] or on sol-gels [24] and use of sequential laser pulses [25][26][27][28][29] are some of the efforts devoted in the last decade to increase the analytical capability of the LIBS technique for liquids analysis. Also, filtration based approaches, collection of the suspended particles like pollen, bacteria, fungi and viruses on filters enabled analysis of biological materials in water [30].…”

Section: Introductionmentioning

confidence: 99%

Development and validation of a laser-induced breakdown spectroscopic method for ultra-trace determination of Cu, Mn, Cd and Pb metals in aqueous droplets after drying

Aras

Yalçın

2016

Talanta

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Keywords:Laser-induced breakdown spectroscopy Liquid droplet analysis Oxidized silicon wafer substrate (Si þ SiO 2 ) a b s t r a c tThe present study reports a fast and accurate methodology for laser-induced breakdown spectroscopic, LIBS, analysis of aqueous samples for environmental monitoring purposes. This methodology has two important attributes: one is the use of a 300 nm oxide coated silicon wafer substrate (Siþ SiO 2 ) for the first time for manual injection of 0.5 microliter aqueous metal solutions, and two is the use of high energy laser pulses focused outside the minimum focus position of a plano convex lens at which relatively large laser beam spot covers the entire droplet area for plasma formation. Optimization of instrumental LIBS parameters like detector delay time, gate width and laser energy has been performed to maximize atomic emission signal of target analytes; Cu, Mn, Cd and Pb. Under the optimal conditions, calibration curves were constructed and enhancements in the LIBS emission signal were obtained compared to the results of similar studies given in the literature. The analytical capability of the LIBS technique in liquid analysis has been improved. Absolute detection limits of 1.3 pg Cu, 3.3 pg Mn, 79 pg Cd and 48 pg Pb in 0.5 microliter volume of droplets were obtained from single shot analysis of five sequential droplets. The applicability of the proposed methodology to real water samples was tested on the Certified Reference Material, Trace Metals in Drinking Water, CRM-TMDW and on ICP multi-element standard samples. The accuracy of the method was found at a level of minimum 92% with relative standard deviations of at most 20%. Results suggest that 300 nm oxide coated silicon wafer has an excellent potential to be used as a substrate for direct analysis of contaminants in water supplies by LIBS and further research, development and engineering will increase the performance and applicability of the methodology.

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Section: Introductionmentioning

confidence: 99%

Development and validation of a laser-induced breakdown spectroscopic method for ultra-trace determination of Cu, Mn, Cd and Pb metals in aqueous droplets after drying

Aras

Yalçın

2016

Talanta

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“…Other impurity enrichment methods include using ion exchange membranes as reported by Schmidt and Goode (2002) and by Kim et al (2010) for Cu detection. Wood and bamboo have also been used as substrates; Zhu et al (2012), Jiang et al (2011), andChen et al (2010) pretreated the aqueous samples by immersing wood or bamboo chips in liquids followed by drying. In these enrichment approaches, researchers seek to Na 2 ppm, Al 1 ppm Caceres et al (2001) overcome the low sensitivity and poor stability challenges of liquid samples by increasing chemical concentration and in most of the cases also eliminate the solvent to obtain solid phase sample.…”

Section: Pretreatment Of Aqueous Samplesmentioning

confidence: 99%

Laser-induced breakdown spectroscopy application in environmental monitoring of water quality: a review

et al. 2014

Environ Monit Assess

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Water quality monitoring is a critical part of environmental management and protection, and to be able to qualitatively and quantitatively determine contamination and impurity levels in water is especially important. Compared to the currently available water quality monitoring methods and techniques, laser-induced breakdown spectroscopy (LIBS) has several advantages, including no need for sample pre-preparation, fast and easy operation, and chemical free during the process. Therefore, it is of great importance to understand the fundamentals of aqueous LIBS analysis and effectively apply this technique to environmental monitoring. This article reviews the research conducted on LIBS analysis for liquid samples, and the article content includes LIBS theory, history and applications, quantitative analysis of metallic species in liquids, LIBS signal enhancement methods and data processing, characteristics of plasma generated by laser in water, and the factors affecting accuracy of analysis results. Although there have been many research works focusing on aqueous LIBS analysis, detection limit and stability of this technique still need to be improved to satisfy the requirements of environmental monitoring standard. In addition, determination of nonmetallic species in liquid by LIBS is equally important and needs immediate attention from the community. This comprehensive review will assist the readers to better understand the aqueous LIBS technique and help to identify current research needs for environmental monitoring of water quality.

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“…Moreover, the hand-held LIBS equipment is also commercially available. Thus, this technique is a suitable candidate for on-site testing, which can be applied in industrial analysis [ 20 , 21 ], environment monitoring [ 22 , 23 , 24 ], food safety [ 25 , 26 ], cultural heritage [ 27 , 28 ], biomedical analysis [ 29 , 30 ], and space exploration [ 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

Laser-Induced Breakdown Spectroscopy for Rapid Discrimination of Heavy-Metal-Contaminated Seafood Tegillarca granosa

Shi

et al. 2017

Sensors

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Tegillarca granosa samples contaminated artificially by three kinds of toxic heavy metals including zinc (Zn), cadmium (Cd), and lead (Pb) were attempted to be distinguished using laser-induced breakdown spectroscopy (LIBS) technology and pattern recognition methods in this study. The measured spectra were firstly processed by a wavelet transform algorithm (WTA), then the generated characteristic information was subsequently expressed by an information gain algorithm (IGA). As a result, 30 variables obtained were used as input variables for three classifiers: partial least square discriminant analysis (PLS-DA), support vector machine (SVM), and random forest (RF), among which the RF model exhibited the best performance, with 93.3% discrimination accuracy among those classifiers. Besides, the extracted characteristic information was used to reconstruct the original spectra by inverse WTA, and the corresponding attribution of the reconstructed spectra was then discussed. This work indicates that the healthy shellfish samples of Tegillarca granosa could be distinguished from the toxic heavy-metal-contaminated ones by pattern recognition analysis combined with LIBS technology, which only requires minimal pretreatments.

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Laser-induced breakdown spectroscopy for determination of trace metals in aqueous solution using bamboo charcoal as a solid-phase extraction adsorbent

Cited by 55 publications

References 36 publications

Development and validation of a laser-induced breakdown spectroscopic method for ultra-trace determination of Cu, Mn, Cd and Pb metals in aqueous droplets after drying

Development and validation of a laser-induced breakdown spectroscopic method for ultra-trace determination of Cu, Mn, Cd and Pb metals in aqueous droplets after drying

Laser-induced breakdown spectroscopy application in environmental monitoring of water quality: a review

Laser-Induced Breakdown Spectroscopy for Rapid Discrimination of Heavy-Metal-Contaminated Seafood Tegillarca granosa

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