Alteration of the ion-optic lens configuration to eliminate mass-dependent matrix-interference effects in inductively coupled plasma-mass spectrometry

Ross, Barbara S.; Hieftje, Gary M.

doi:10.1016/0584-8547(91)80122-j

Cited by 41 publications

(9 citation statements)

References 21 publications

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“…Elle résulte des effets de charge se produisant dans des régions de l'appareil à faible champ électrostatique (Ross et Hieftje 1991, Niu et Houk 1996 et produit un transport préférentiel des isotopes lourds dans l'analyseur. Elle est forte (1%/amu) et à peu près constante pour chaque élément.…”

Section: Iii23 La Discrimination De Masseunclassified

Application des traceurs isotopiques Pb-Pb Sm-Nd et Lu-Hf à la compréhension de l histoire archéenne du bouclier canadien et à la formation de la croûte continentale

Isnard¹

2003

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Section: Iii23 La Discrimination De Masseunclassified

Application des traceurs isotopiques Pb-Pb Sm-Nd et Lu-Hf à la compréhension de l histoire archéenne du bouclier canadien et à la formation de la croûte continentale

Isnard¹

2003

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“…On a given ICPMS instrument, non-spectroscopic interferences have been found to depend on the lens configuration and settings, [9][10][11] the plasma operating conditions, 12 the ion sampling interface 7,13,14 and the sample introduction system. 15,16 In fact, removing the spray chamber altogether, through the use of a direct injection nebulizer, significantly reduced non-spectroscopic interference effects.…”

Section: Introductionmentioning

confidence: 99%

Evidence supporting the occurrence of Coulomb fission during conventional sample introduction in inductively coupled plasma mass spectrometry

Fraser

Beauchemin

2009

J. Anal. At. Spectrom.

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distribution in inductively coupled plasma mass spectrometry were examined for solutions containing 1% v/v HNO 3 (i.e. 0.16 M) with and without 0.02 M NaNO 3 , KNO 3 , CsNO 3 , HI or HCl. None of the latter matrices induced a significant change in sample introduction efficiency compared to 1% v/v HNO 3 alone. Nonetheless, although analyte signal suppression was predominant in the presence of the K and Cs matrices, 0.02 M Na induced an enhancement by 1.6 AE 0.3 across the mass range, which was irrespective of the analyte ionization potential (i.e. even analytes that should be completely ionized were enhanced). This may be rationalized using a Coulomb fission mechanism within the spray chamber, which shifts the droplet size distribution towards smaller ones that are then more efficiently transported through the spray chamber and ultimately result in more analyte ions in the plasma. Furthermore, desolvation of these smaller droplets is completed sooner in the ICP, as axial profiles of the oxide fraction of La and Ce were shifted lower in the plasma in the presence of a non-volatile ionic matrix (0.02 M NaNO 3 , KNO 3 , CsNO 3 ) but were unaffected by 0.02 M HCl or HI. The broadened analyte radial profile in the presence of 0.02 M Na, which was observed at the optimum sampling depth for a 1% v/v HNO 3 matrix, also points to earlier desolvation. These results suggest that the Coulomb fission mechanism may be significant with a conventional sample introduction system.

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“…In the MC-ICP-MS, little mass fractionation occurs during ionization because the ionization efficiencies approach 100% (~ less than 1% in the TIMS) (White et al, 2000). Mass fractionation in the MC-ICP-MS is thought to result from space-charge effects in the low electrostatic field regions of the instrument; as the ion beam expands, lighter ions migrate to the exterior of the plasma and are focused less efficiently in the mass analyzer (Ross and Hieftje, 1991;Marechal et al, 1999;Niu and Houk, 1996;Hirata, 1996;White et al, 2000).…”

Section: Mass Fractionation Correctionmentioning

confidence: 99%

“…The so-called matrix effect within the ICP-MS is poorly understood and is thought to vary from one instrument to another. Ross and Hieftje (1991) showed apparent matrix-induced interferences on ion intensities. White et al (2000) proposed that the relatively large standard deviation of real rock analysis might be partially caused by matrix effect; impurities in the analyte Almost perfect linear correlations are unexpected if both correction procedures were perfect as there should be a single value with random errors about the means, but the within-error (±2σ) correlations demonstrate that the simple linear correction is adequate.…”

Section: Matrix Effect and Dilution Experimentsmentioning

confidence: 99%

Multi‐collector ICP‐MS Analysis of Pb Isotope Ratios in Rocks: Data, Procedure and Caution

Yaoling

2003

Acta Geologica Sinica (Eng)

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The authors measured Pb isotope compositions of seven USGS rock reference standards, i.e. AGV-1, AGV-2, BHVO-1, BHVO-2, BCR-2, BIR-1/1 and W-2, together with NBS 981 using a micromass isoprobe multicollector inductively-coupled plasma mass spectrometer (MC-ICP-MS) at the University of Queensland. 203Tl-205 Tl isotopes were used as an internal standard to correct for mass-dependant isotopic fractionation. The results for both NBS 981 and USGS rock standards AGV-1 and BHVO-1 are comparable to or better than double-and triple-spike TIMS (thermal ionization mass spectrometry) data in precision. The data for BHVO-2 and, to a lesser extent, AGV-2 and BCR-2 are reproducibly higher for 206 205 Tl. These mass tailings lead to over-subtraction of the baseline for 204 Pb, which is measured at ±0.5 amu on both sides of mass-204 (i.e., at amu 203.5 and 204.5 respectively). Such errors are insignificant for Pb-rich sample solutions (i.e., high Pb/Tl ratios), but can be severe for low-Pb sample solutions when over-"spiked" with Tl. Experiments in this study suggest that a minimum concentration ratio of Pb/Tl>5 in Tl-"spiked" solutions be required to ensure reliable 206 Tl can also lead to over-subtraction of baselines for 202 Hg (at amu 202.5) and 206 Pb (at amu 205.5). Therefore, the elegance of using 203 Tl and 205 Tl isotopes for mass fractionation correction becomes a severe problem in low-Pb rock solutionscaution is required. Alternative internal standards for mass fractionation correction may be considered. Of course, significant instrumental refinement in abundance sensitivity is in demand.

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Alteration of the ion-optic lens configuration to eliminate mass-dependent matrix-interference effects in inductively coupled plasma-mass spectrometry

Cited by 41 publications

References 21 publications

Application des traceurs isotopiques Pb-Pb Sm-Nd et Lu-Hf à la compréhension de l histoire archéenne du bouclier canadien et à la formation de la croûte continentale

Application des traceurs isotopiques Pb-Pb Sm-Nd et Lu-Hf à la compréhension de l histoire archéenne du bouclier canadien et à la formation de la croûte continentale

Evidence supporting the occurrence of Coulomb fission during conventional sample introduction in inductively coupled plasma mass spectrometry

Multi‐collector ICP‐MS Analysis of Pb Isotope Ratios in Rocks: Data, Procedure and Caution

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