On-line and in-situ detection of lead aerosols by plasma-spectroscopy and laser-excited atomic fluorescence spectroscopy

Neuhauser, R.E.; Panne, Ulrich; Petrucci, Giuseppe A.; Cavalli, P.; Omenetto, N.

doi:10.1016/s0003-2670(97)00244-4

Cited by 95 publications

(39 citation statements)

References 41 publications

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“…To monitor Pb 2+ level, several methods have been developed, including inductively coupled plasma mass spectrometry [6,7], atomic fluorescence spectrometry [8,9], atomic absorption spectroscopy [10], reversed-phased high-performance liquid chromatography [11], and so on. Even with sensitivity and accuracy, there also share some disadvantages, such as timeconsuming, expensive, and/or require sophisticated equipment, etc.…”

Section: Introductionmentioning

confidence: 99%

Colorimetric assay of lead using unmodified gold nanorods

et al. 2012

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Lead poisoning in adults can affect the peripheral and central nervous systems, the kidneys, and blood pressure. Thus, the development of environment-friendly and simple methods for Pb 2+ detection is of great importance. Herein, a label-free colorimetric method has been developed for the detection of Pb 2+ based on the conformational switch from single-stranded DNA to G-quadruplex. The electrostatic interactions between DNA probe and gold nanorods (GNRs) induce GNRs to space closely. However, the electrostatic interaction is not strong enough to change the suspension state of GNRs. In the presence of Pb 2+ , the formation of G-quadruplexes increases the surface charge density around DNA, which is expected to strengthen the electrostatic interaction between the GNRs and the DNA. Therefore, the longitudinal absorption of GNRs decreased because the stronger interaction induced aggregation of GNRs. Importantly, the decrease in longitudinal absorption is proportional to concentration of Pb 2+ . By monitoring the change of absorbance, Pb 2+ can be detected at a level of 3 nM with a linear range from 5 nM to 1 μM. The overall test only takes a few minutes and very little interference is observed from other metal ions. The major advantages of this method are its low cost, convenience, simplicity, sensitivity, and specificity.

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Section: Introductionmentioning

confidence: 99%

Colorimetric assay of lead using unmodified gold nanorods

et al. 2012

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“…Single particle analysis is also a rapidly developing field. There are many publications on the above subjects, and reference to only a few is made here [25][26][27][28][29][30][31][32][33][34][35].…”

Section: A Selected Example: Detection Of Lead In the Atmospherementioning

confidence: 99%

“…In our laboratory, there is a current interest in the development of laser methods to detect specific elements in size-segregated atmospheric aerosols and in sub-micron particles [32]. Our preliminary experiments were carried out with lead, not only because of its importance as a toxic element in the atmosphere, but also because it has a favourable excitation/detection scheme by LIF.…”

Section: A Selected Example: Detection Of Lead In the Atmospherementioning

confidence: 99%

Absolute and/or relative detection limits in laser-based analysis: the end justifies the means

Omenetto

Petrucci

Cavalli

et al. 1996

Analytical and Bioanalytical Chemistry

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The absolute limit of detection usually expresses the minimum amount of analyte detectable, while the relative limit of detection refers to the minimum concentration of analyte detectable. These concepts and their differences are obviously familiar to all analytical spectroscopists. Nevertheless, the two definitions are used liberally in the literature. For example, it is not uncommon to refer to exceptional sub-femtograms detection limits for a technique used to analyse ultratrace levels of an element in water and to a modest part per million detection limit of another technique used to characterise the microdistribution of an element in a sample mass of about one microgram. In this paper, an attempt is made to point out that the terms "ultratrace analysis" and "microanalysis" must refer to two conceptually different approaches and that there are cases in which one definition is more appropriate than the other. It is argued that, while there is no objection in reporting both detection limits when a single technique is evaluated, one has to be careful in choosing the most appropriate definition when different analytical techniques are compared.

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“…An important variant of the two-pulse scheme combines the advantages of LIBS with those of laser-induced fluorescence spectroscopy (LIF). [11][12][13][14][15][16][17] In the LIBS-LIF scheme, the second pulse, tuned to a specific transition wavelength of the analyte of interest, is used to enhance the fluorescence signal of the analyte and thus increase its signal-to-noise ratio (SNR). The optimal conditions are achieved for a cool and low-density atomic gaseous vapour of material, with enough atoms in the ground state to maximize the absorption of the second laser pulse.…”

Section: A Introductionmentioning

confidence: 99%

Investigation of resonance-enhanced laser-induced breakdown spectroscopy for analysis of aluminium alloys

Goueguel

Laville

Vidal

et al. 2010

J. Anal. At. Spectrom.

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Resonance-enhanced laser-induced breakdown spectroscopy (RELIBS) was investigated with the aim to improve the limit of detection of trace elements in the context of elemental analysis of aluminium alloys. A Q-switched Nd:YAG laser pulse (7 ns, 1064 nm) was used for ablation of the samples and was followed, after a suitable delay, by an Optical Parametric Oscillator (OPO) laser pulse (7 ns), tuned at 396.15 nm, to resonantly excite the aluminium host atoms. In particular, the Mg I 285.21 nm and Si I 288.16 nm lines were observed in the acquisition spectral window. We investigated the influence of the main experimental parameters, namely, the excitation wavelength, the interpulse delay and the ablation and excitation fluences, on the signal-to-noise ratio for the Mg I 285.21 nm line. We found that, at low ablation fluences, typically less than a few J cm À2 , the Mg signal at 285.21 nm achieved using RELIBS was significantly enhanced when compared to LIBS using the same ablation fluence. At fluences higher than 8 J cm À2 , the effect of the excitation pulse became unnoticeable and similar results were observed for both approaches. The optimum conditions were achieved for an interpulse delay of about 30 ns, an ablation fluence of about 3.8 J cm À2 and an excitation fluence of about 1.1 J cm À2 . The corresponding absolute LoDs were 0.7 and 50 fg, for Mg and Si, respectively, using RELIBS. When using LIBS, they were 4 and 128 fg, instead. Finally, the applicability of RELIBS in the context of a minimally destructive elemental analysis is discussed.

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On-line and in-situ detection of lead aerosols by plasma-spectroscopy and laser-excited atomic fluorescence spectroscopy

Cited by 95 publications

References 41 publications

Colorimetric assay of lead using unmodified gold nanorods

Colorimetric assay of lead using unmodified gold nanorods

Absolute and/or relative detection limits in laser-based analysis: the end justifies the means

Investigation of resonance-enhanced laser-induced breakdown spectroscopy for analysis of aluminium alloys

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