Element determinations in aqueous and acetonitrile containing solutions by atomic emission spectrometry using a microwave plasma torch

Prokisch, C.; Broekaert, J. A. C.

doi:10.1016/s0584-8547(98)00096-2

Cited by 18 publications

(8 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The microwave plasma ion source used in this study consists of a commercial 2450 MHz microwave generator (Model GMP-03K/SM, Sairem) and an in-house fabricated MPT source. This microwave plasma source is a modified version of the one originally introduced by Jin et al, and has been demonstrated elsewhere for analytical atomic spectrometry. − A X−Y−Z three-dimension translatable stage is used to precisely adjust the position of the plasma torch and to facilitate optimization of the ion sampling position.…”

Section: Methodsmentioning

confidence: 99%

Helium Plasma Source Time-of-Flight Mass Spectrometry: Off-Cone Sampling for Elemental Analysis

Duan

Jin

2000

Anal. Chem.

View full text Add to dashboard Cite

In this paper, an atmospheric pressure, helium microwave-induced plasma (MIP) ion source coupled with an orthogonal acceleration time-of-flight mass spectrometer (TOFMS) is explored for elemental analysis. Studies of the relationship between ion signals and sampling distance of the MS reveal that background signals can be suppressed dramatically without sacrificing the signal intensities of analytes when the microwave plasma plume is off the tip of the sampler orifice. This "off-cone" ion sampling mode provides a technique to obtain nearly "clean" background spectra and, thus, eliminates the spectral interference from entrainment air and the working-gas species, making it possible to sensitively determine isotopes that suffered from spectral interference in ICPMS and MIPMS (such as 40Ca, 52Cr, 55Mn, and 56Fe). On the other hand, since the high-temperature plasma is kept away from the sampler aperture, off-cone sampling places little demand on the cooling device and the lifetime of the sampler plate can be extended. The instrumental system can provide a fairly good mass resolution of 1100 (fwhm). The detection limits (3sigma) in the tens of picograms per milliliter level for the elements studied can be achieved with a digital oscilloscope. These detection limits can be easily improved with an advanced detection system, which is currently available in commercial markets.

show abstract

Section: Methodsmentioning

confidence: 99%

Helium Plasma Source Time-of-Flight Mass Spectrometry: Off-Cone Sampling for Elemental Analysis

Duan

Jin

2000

Anal. Chem.

View full text Add to dashboard Cite

show abstract

“…In particular, the MPT is gaining popularity. This torch typically features elemental detection limits that are only slightly worse than those typically achieved with ICPs [30][31][32][33][34][35][36][37][38][39]. In some cases detection limits achieved with the MPT are even better.…”

Section: The Plasma Sourcesmentioning

confidence: 97%

Excitation balances and transport properties in atmospheric microwave-induced plasmas studied by power interruption experiments

Timmermans¹,

Mullen

Thomas

et al. 2000

Plasma Sources Sci. Technol.

View full text Add to dashboard Cite

Atmospheric microwave-induced argon plasmas with and without analyte injection have been exposed to power interruption experiments in order to study transport processes and to reveal dominant excitation balances. From the time-dependent behaviour of line intensities due to electron cooling and quenching during the power interruption, it is found that electron loss channels, such as diffusion, convection and the dissociative recombination of molecular ions, are much larger than for inductively coupled plasmas. It is found that in the ionizing part of the plasma electron dominated mechanisms are responsible for the population of radiative levels. Significant changes in the responses to power interruption are observed when small amounts of molecular compounds are injected (>0.5%), probably due to a decrease of the electron density. Furthermore, it is found that in the recombination zone downstream in the plasma an electron-independent excitation mechanism, probably thermal excitation, is responsible for the population of radiative levels of analytes with relatively low excitation energies. From the downstream propagation of a disturbance created in the ionizing part of the plasma the local axial gas velocity has been determined. In the analyte excitation zone of the plasma typical velocities are around 25 m s −1 , whereas in the recombining zone velocities of 12-18 m s −1 are obtained.

show abstract

“…It uses one fourth wavelength in a 2450 MHz power supply instead of the three fourths wavelength torch previously used in our laboratory and the literature. [13][14][15][16][17] Second, various materials were tested for the central tube of the torch, including copper, stainless steel, quartz, and ceramic. Stainless steel and ceramic tubes give the best performance, and ceramic tube shows best sample erosion tolerance on the tip of the central tube.…”

Section: B Microwave Plasma Torch and The Power Systemmentioning

confidence: 99%

Design and development of a highly sensitive, field portable plasma source instrument for on-line liquid stream monitoring and real-time sample analysis

Duan

Jin

et al. 2000

Review of Scientific Instruments

View full text Add to dashboard Cite

The development of a highly sensitive, field portable, low-powered instrument for on-site, real-time liquid waste stream monitoring is described in this article. A series of factors such as system sensitivity and portability, plasma source, sample introduction, desolvation system, power supply, and the instrument configuration, were carefully considered in the design of the portable instrument. A newly designed, miniature, modified microwave plasma source was selected as the emission source for spectroscopy measurement, and an integrated small spectrometer with a charge-coupled device detector was installed for signal processing and detection. An innovative beam collection system with optical fibers was designed and used for emission signal collection. Microwave plasma can be sustained with various gases at relatively low power, and it possesses high detection capabilities for both metal and nonmetal pollutants, making it desirable to use for on-site, real-time, liquid waste stream monitoring. An effective in situ sampling system was coupled with a high efficiency desolvation device for direct-sampling liquid samples into the plasma. A portable computer control system is used for data processing. The new, integrated instrument can be easily used for on-site, real-time monitoring in the field. The system possesses a series of advantages, including high sensitivity for metal and nonmetal elements; in situ sampling; compact structure; low cost; and ease of operation and handling. These advantages will significantly overcome the limitations of previous monitoring techniques and make great contributions to environmental restoration and monitoring. ͓S0034-6748͑00͒03103-8͔

show abstract

Element determinations in aqueous and acetonitrile containing solutions by atomic emission spectrometry using a microwave plasma torch

Cited by 18 publications

References 26 publications

Helium Plasma Source Time-of-Flight Mass Spectrometry: Off-Cone Sampling for Elemental Analysis

Helium Plasma Source Time-of-Flight Mass Spectrometry: Off-Cone Sampling for Elemental Analysis

Excitation balances and transport properties in atmospheric microwave-induced plasmas studied by power interruption experiments

Design and development of a highly sensitive, field portable plasma source instrument for on-line liquid stream monitoring and real-time sample analysis

Contact Info

Product

Resources

About