Time-resolved LIBS experiment for quantitative determination of pollutant concentrations in air

Casini, M.; Harith, M. A.; Palleschi, Vincenzo; Salvetti, A.; Singh, D. P.; Vaselli, M.

doi:10.1017/s0263034600003633

Cited by 50 publications

(12 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The LIBS signals are temporal in nature and last for about 10-100 µs after the plasma is formed. The technique has been used for liquids, gases, and solids, including limited application to aerosols (Hahn et al 1997;Buckley et al 2000;Fisher et al 2001), ambient pollution monitoring (Casini et al 1991;Gaudiuso et al 2010), industrial process monitoring (Noll et al 2001Fink et al 2002;Balzer et al 2006), and standoff or remote detection (Ball et al 2005;Alvarez-Trujillo et al 2008;Gottfried et al 2008).…”

Section: Introductionmentioning

confidence: 99%

New Approach for Near-Real-Time Measurement of Elemental Composition of Aerosol Using Laser-Induced Breakdown Spectroscopy

Diwakar

Kulkarni

Birch

2012

Aerosol Science and Technology

View full text Add to dashboard Cite

A new approach has been developed for making near-real-time measurement of elemental composition of aerosols using plasma spectroscopy. The method allows preconcentration of miniscule particle mass (pg to ng) directly from the sampled aerosol stream through electrostatic deposition of charged particles (30-900 nm) onto a flat-tip microneedle electrode. The collected material is subsequently ablated from the electrode and monitored by laserinduced breakdown spectroscopy. Atomic emission spectra were collected using a broadband spectrometer with a wavelength range of 200-980 nm. A single-sensor delay time of 1.3 µs was used in the spectrometer for all elements to allow simultaneous measurement of multiple elements. The system was calibrated for various elements including Cd, Cr, Cu, Mn, Na, and Ti. The absolute mass detection limits for these elements were experimentally determined and found to be in the range of 0.018-5 ng. The electrostatic collection technique has many advantages over other substrate-based methods involving aerosol collection on a filter or its focused deposition using an aerodynamic lens. Because the particle mass is collected over a very small area that is smaller than the spatial extent of the laser-induced plasma, the entire mass is available for analysis. This considerably improves reliability of the calibration and enhances measurement accuracy and precision. Further, the aerosol collection technique involves very low pressure drop, thereby allowing higher sample flow rates with much smaller pumps-a desirable feature for portable instrumentation. Higher flow rates also make it feasible to measure trace element concentrations at part per trillion levels. Detection limits in the range of 18-670 ng m −3 can be achieved for most of the elements studied at a flow rate of 1.5 L min −1 with sampling times of 5 min.

show abstract

Section: Introductionmentioning

confidence: 99%

New Approach for Near-Real-Time Measurement of Elemental Composition of Aerosol Using Laser-Induced Breakdown Spectroscopy

Diwakar

Kulkarni

Birch

2012

Aerosol Science and Technology

View full text Add to dashboard Cite

show abstract

“…After these initial studies, applications of LIBS to particle characterization have been primarily directed at in-situ, real-time detection in industrial processes (e.g., relatively dense particle concentration systems). Although the potential exists for real-time atmospheric monitoring (e.g., very dilute particle concentrations, see Sneddon's review 41 and Harith et al 42 ), this remains a research direction awaiting exploration.…”

Section: Applications To Particle Characterizationmentioning

confidence: 99%

Laser Induced Plasma Spectroscopy for the Characterization of Aerosols and Particulates

Smith

Hahn

Gibb

et al. 2001

KONA

View full text Add to dashboard Cite

Laser induced plasma spectroscopy is beginning to find useful applications in the real time in situ detection of particulates and aerosols suspended in gases. Although the technique is almost 40 years old, it has become increasingly practical for this application during the last decade due to the development of more reliable lasers and optical detection systems, an improved understanding of the physical processes involved, and new data collection and analysis strategies. There is a pressing need for such detection techniques for industrial process and atmospheric monitoring. In this review, we examine literature concerned with the process of optical breakdown by focused lasers in gases, the role of particles in this process, and the characterization of particles using laser induced plasmas.

show abstract

“…[12] Among them, LIBS is an analytical detection technique based on atomic emission spectroscopy to measure elemental compositions. With the development of laser and detection systems, LIBS has been widely applied for composition measurement in gas, [13][14][15] liquid, [16][17][18] and solid materials. [19][20][21][22][23][24] Especially, the advantages of the method are its applicability to various fields such as combustion, metallurgy, and the harsh environment.…”

Section: Introductionmentioning

confidence: 99%

Breakdown Pattern of Hydrocarbons by Laser Breakdown Time-of-flight Mass Spectrometry

Wang

Deguchi

Yan

et al. 2015

Spectroscopy Letters

View full text Add to dashboard Cite

The laser breakdown time-of-flight mass spectrometry was developed and applied to detect the breakdown patterns of hydrocarbons that are significant to improve the detectability of heavy metals compounded in various mixtures such as particles and hydrocarbons. The laser wavelength dependence of this method was evaluated using 1064, 532, and 266 nm laser outputs. Breakdown processes using 1064 and 532 nm outputs showed less interference of fragmentation for the detection of various heavy metals. The method was applied to various hydrocarbons and it showed the possibility of categorization of hydrocarbon groups using the pattern of breakdown products.

show abstract

Time-resolved LIBS experiment for quantitative determination of pollutant concentrations in air

Cited by 50 publications

References 5 publications

New Approach for Near-Real-Time Measurement of Elemental Composition of Aerosol Using Laser-Induced Breakdown Spectroscopy

New Approach for Near-Real-Time Measurement of Elemental Composition of Aerosol Using Laser-Induced Breakdown Spectroscopy

Laser Induced Plasma Spectroscopy for the Characterization of Aerosols and Particulates

Breakdown Pattern of Hydrocarbons by Laser Breakdown Time-of-flight Mass Spectrometry

Contact Info

Product

Resources

About