Noise characteristics of aerosols produced by inductively coupled plasma nebulizers

Luan, Shen; Pang, Ho-ming; Shum, Sam C. K.; Houk, R. S.

doi:10.1039/ja9920700799

Cited by 18 publications

(17 citation statements)

References 27 publications

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“…The amplitude of the noises coming from the pump increases when the pulses become more frequent in opposition to that was previously reported [4]. As expected, no discrete noise is detected when the sample is freely aspirated, but white noise (∼ -65 dB) and 1/f noise are greater than when sample introduction is mechanically constrained, similarly to that was already reported [7]. At that time the Ar flow alone controls the sample uptake.…”

Section: Noise Identificationmentioning

confidence: 44%

“…Many sources of noises, identified by power analysis of noise, have also an ominous influence on the precision, the detection limits, and the dynamic range. They may originate from the sample introduction system, the main power or from other parts of the instrument [3][4][5][6][7][8][9][10][11]. However, their amplitude can be directly reduced.…”

Section: Introductionmentioning

confidence: 99%

“…Original articles at which each individual roller squeezes the sample introduction tube [7]. It is obtained by:…”

mentioning

confidence: 99%

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Noise identification and sampling frequency determination for precise Pb isotopic measurements by quadrupole-based Inductively Coupled Plasma Mass Spectrometry

et al. 2000

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Abstract. Analytical precision of the isotope ratios measured by quadrupole-based ICP-MS is drastically controlled by the lowfrequency noises which originate from nebulisation and vaporisation processes, and from sample introduction systems. The undesirable influence of these latter can be however reduced by choosing efficiently the operating parameters. In the present study, the choice of the stabilisation time necessary in peak jump mode, and the one of the number of sweeps are discussed in the light of noise power spectra obtained with various speeds of the peristaltic pump used as sample introduction system. Obviously, the settings proposed are probably efficient only on our own ICP-MS, but they can be determined without any difficulty on any other equipment, only by following the methodology detailed here. With such guidelines, experimental within-run RSD % were observed following closely those predicted by the counting statistics (∼ 110 %). The isotopic measurements of natural samples (overbank sediments, airborne particulate matter, lichens and rainwater) exhibited fair accuracy and good reproducibility, making highly convenient the use of the ICP-MS, at least in an environmental purpose.Keywords. Inductively coupled plasma mass spectrometry -lead isotope ratios -instrumental parameters -optimisationnoise -quality control.

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Section: Noise Identificationmentioning

confidence: 44%

Section: Introductionmentioning

confidence: 99%

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Noise identification and sampling frequency determination for precise Pb isotopic measurements by quadrupole-based Inductively Coupled Plasma Mass Spectrometry

et al. 2000

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“…One way to avoid this problem may be to use a peristaltic pump in the sample introduction system to maintain a constant flow rate. 20 Although this can lead to the signal pulsation corresponding to the flow pulses which arise as each individual roller of the pump squeezes the pump tubing, 21 this is minimal when using a finely controllable peristaltic pump. In addition, simultaneous measurements using MC-ICP-MS could also minimize signal fluctuations caused by pulsation.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Measurement Precisions for Uranium Isotopes at Ultra Trace Levels by Modification of the Sample Introduction System in MC-ICP-MS

Park¹,

Lim²,

Han³

et al. 2016

Mass Spectrometry Letters

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: Multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) is currently used in our laboratory for isotopic and quantitative analyses of nuclear materials at ultra-trace levels in environmental swipe samples, which is a very useful for monitoring undeclared nuclear activities. In this study, to improve measurement precisions of uranium isotopes at ultratrace levels, we adopted a desolvating nebulizer system (Aridus-II, CETAC., USA), which can improve signal sensitivity and reduce formation of uranium hydride. A peristaltic pump was combined with Aridus-II in the sample introduction system of MC-ICP-MS to reduce long-term signal fluctuations by maintaining a constant flow rate of the sample solution. The signal sensitivity in the presence of Aridus-II was improved more than 10-fold and the formation ratio of UH/U decreased by 16-to 17-fold compared to a normal spray chamber. Long-term signal fluctuations were significantly reduced by using the peristaltic pump. Detailed optimizations and evaluations with uranium standards are also discussed in this paper.

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“…The sample introduction process is typically the main source of flicker noise in ICP-MS. Luan et al (76) described noise characteristics of the aerosols generated by ICP nebulizers. Discrete frequency noise in the aerosol generated by a Meinhard nebulizer or a direct injection nebulizer (DIN) is primarily caused by pulsation in the liquid flow from the pump.…”

Section: Noise Characteristicsmentioning

confidence: 99%

Fundamental studies of the plasma extraction and ion beam formation processes in inductively coupled plasma mass spectrometry

Niu

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Noise characteristics of aerosols produced by inductively coupled plasma nebulizers

Cited by 18 publications

References 27 publications

Noise identification and sampling frequency determination for precise Pb isotopic measurements by quadrupole-based Inductively Coupled Plasma Mass Spectrometry

Noise identification and sampling frequency determination for precise Pb isotopic measurements by quadrupole-based Inductively Coupled Plasma Mass Spectrometry

Improvement of Measurement Precisions for Uranium Isotopes at Ultra Trace Levels by Modification of the Sample Introduction System in MC-ICP-MS

Fundamental studies of the plasma extraction and ion beam formation processes in inductively coupled plasma mass spectrometry

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