Characterization of the aerosols generated by a new microwave thermal nebulizer

Bordera, Luis; Todolı́, José-Luis; Mora, Juan; Canals, Antonio; Hernandis, Vicente

doi:10.1016/0021-8502(96)00266-2

Cited by 5 publications

(3 citation statements)

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“…One of the potential applications of MW radiation is its use for aerosol generation, in the form of a microwave-powered thermospray nebulizer (MWTN), , which is the aim of this paper. To our knowledge, this is the first time that the absorption of MW radiation by the sample solution has been applied to aerosol generation in atomic spectrometry.…”

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confidence: 99%

A Microwave-Powered Thermospray Nebulizer for Liquid Sample Introduction in Inductively Coupled Plasma Atomic Emission Spectrometry

et al. 1997

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A new thermospray nebulizer based on the absorption of microwave radiation (MWTN) by aqueous solutions of strong acids is presented for the first time. To this end, a given length of the sample capillary is placed inside the cavity of a focused microwave system. A small piece of a narrower capillary tubing is connected at the tip of the sample capillary, outside the microwave cavity, to build up pressure. Drop size distributions of primary aerosols are exhaustively measured in order to evaluate the influence of several experimental variables (microwave power, liquid flow, irradiation length, inner diameter of the outlet capillary, nature and concentration of the acid) on the characteristics of the primary aerosol that are related to the emission signal. These experiments have been performed mainly to increase our understanding of the microscopic process of this new type of aerosol generation. A standard Meinhard nebulizer was employed for comparison. Under the best conditions the entire aerosol volume is contained in droplets smaller than 20 μm compared with 45% of the volume of the aerosol generated by the Meinhard. Hence, higher analyte and aerosol transport rates are to be expected for the MWTN compared with the Meinhard nebulizer. As any highly efficient nebulizer, MWTN requires a desolvation unit. For solutions 0.75 M in strong acid, the new nebulizer improves sensitivity (1.0-2.8 times), limits of detection (1.2-3.0 times), and background equivalent concentration (0.9-2.0 times) as compared to the standard Meinhard nebulizer, features many of the advantages of the conventional thermospray nebulizer, and overcomes some of its drawbacks (MWTN does not show corrosion problems and works at lower pressure, the aerosol characteristics are not modified when the PTFE capillary is replaced).

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confidence: 99%

A Microwave-Powered Thermospray Nebulizer for Liquid Sample Introduction in Inductively Coupled Plasma Atomic Emission Spectrometry

et al. 1997

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“…The (MWTN) has been developed that enables solid samples to be amount of loss was dependent on the counter-flow of gas digested on-line. 196 The nebulizer exhibited lower LODs than through the membrane, but was in the range 10-40%. It was a Meinhard and did not become blocked.…”

Section: Sample Introductionmentioning

confidence: 95%

Atomic Spectrometry Update–Atomic emission spectrometry

Marshall¹,

Fisher²,

Chenery³

et al. 1998

J. Anal. At. Spectrom.

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“…To overcome this problem, several highly efficient nebulizers have been proposed. Among them, nebulizers such as the single-bore high-pressure pneumatic nebulizer 18 or the microwave-based thermal nebulizer 19 are good alternatives to the conventional pneumatic ones to operate with high salt content solutions. The main problem of these nebulizers is the requirement of a desolvation system, due to the high amount of solvent transported to the plasma.…”

Section: Introductionmentioning

confidence: 99%

The role of the nebulizer on the sodium interferent effects in inductively coupled plasma atomic emission spectrometry

Cano

Todolı́

Hernandis

et al. 2002

J. Anal. At. Spectrom.

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The role of the nebulizer on the sodium chloride interferent effects in ICP-AES was investigated. Three different pneumatic nebulizers coupled to a cyclonic spray chamber were investigated: a V-groove (VGN) and two new pneumatic concentric nebulizers specifically designed to work with saline solutions (the 'Seaspray' nebulizer, SSN, and experimental nebulizer, EN). The effect of the salt concentration on the characteristics of the aerosols generated by the nebulizers (primary aerosols) and those at the exit of the spray chamber (tertiary aerosols) on the transport parameters and on the analytical figures of merit in ICP-AES were evaluated. The characteristics of the primary aerosols were related to their critical dimensions and were independent of the solution salt concentration. Solvent and analyte transport rates were related to the characteristics of the primary aerosols. Thus, the SSN provided the highest solution transport rates followed by the EN and VGN. The Mn II emission signal correlated quite well with transport parameters. When the salt concentration increased, an interference effect on the ICP-AES emission signal was observed. This effect was related to the nebulizer employed. Thus, for the SSN, the effect of the sodium chloride on the emission signal was different for the ionic and atomic lines. For the remaining nebulizers, a depressive effect of the salt concentration on the emission signal was always observed irrespective of the line considered. The magnitude of the interference was different for each nebulizer and was related to the amount of solvent transported to the plasma. In general terms, by increasing the salt concentration, poorer signal precision and limits of detection were obtained. These results confirm the importance of sustaining robust plasma conditions to reduce the sodium chloride interferences.

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Characterization of the aerosols generated by a new microwave thermal nebulizer

Cited by 5 publications

References 0 publications

A Microwave-Powered Thermospray Nebulizer for Liquid Sample Introduction in Inductively Coupled Plasma Atomic Emission Spectrometry

A Microwave-Powered Thermospray Nebulizer for Liquid Sample Introduction in Inductively Coupled Plasma Atomic Emission Spectrometry

Atomic Spectrometry Update–Atomic emission spectrometry

The role of the nebulizer on the sodium interferent effects in inductively coupled plasma atomic emission spectrometry

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