Precise analysis of copper and zinc isotopic compositions by plasma-source mass spectrometry

Maréchal, Chloé; Télouk, Philippe; Albarède, Francis

doi:10.1016/s0009-2541(98)00191-0

Cited by 1,158 publications

(1,081 citation statements)

References 45 publications

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“…This isotope ratio calibration model, also known as the external empirical normalization, was first introduced by Maréchal et al 26 for determination of the Zn isotope ratio using Cu as a reference element and has been most recently used for the determination of Hg isotope ratios via Tl. 22 The logic and validation of this measurement process has been described in detail elsewhere.…”

Section: R I/74mentioning

confidence: 99%

“…22 The logic and validation of this measurement process has been described in detail elsewhere. [24][25][26] As the model has now been sucesfully employed for the analysis of Cu-Zn 26 , Hg-Tl 22 and Pb-Tl 27 , we believe that it can be applicable for high-precision absolute isotope ratio measurements of any other element. Moreover, the universal applicability of this model is also strongly supported by the lack of untestable assumptions in its mathematical framework.…”

Section: R I/74mentioning

confidence: 99%

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Resolving the Germanium Atomic Weight Disparity Using Multicollector ICPMS

Yang

Meija

2010

Anal. Chem.

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Two most recent mass spectrometric measurements of natural isotopic composition germanium gave discordant Ge atomic weight values of 72.6276(64) k=2 and 72.6390(69) k=2 , respectively, a decade ago. Each measurement was performed with a different mass spectrometry platform, gas source isotope ratio mass spectrometry and thermal ionization mass spectrometry, respectively. Herein we report results obtained by multicollector inductively coupled plasma mass spectrometry yielding an atomic weight of germanium 72.6296(19) k=2 which is in support of the upcoming 2009 Standard Atomic Weight adjustment by IUPAC. Germanium isotope ratios were calibrated using a regression mass bias correction model and NIST SRM 994 gallium isotopic reference material. In this model, no assumptions are made regarding the mass bias differences between gallium and germanium or between the isotopes of germanium. Isotope ratios of 0.5620(21), 0.7515(16), 0.2125(7) and 0.2121(12) were obtained for n( 70

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Section: R I/74mentioning

confidence: 99%

Section: R I/74mentioning

confidence: 99%

Resolving the Germanium Atomic Weight Disparity Using Multicollector ICPMS

Yang

Meija

2010

Anal. Chem.

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“…An advantage of MC-ICP-MS is the ability to monitor on-line and to correct for mass fractionation during measurement, by the addition of Ir to Re analyte solutions (Schoenberg et al, 2000;Liang et al, 2005;Maréchal et al, 1999;Rehkämper and Mezger, 2000;Waight et al, 2002;Kehm et al, 2003). The Re standard and sample solutions were diluted using Milli-Q water.…”

Section: Re Measurement Proceduresmentioning

confidence: 99%

Simplified technique for the measurements of Re-Os isotope by multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS)

Liang

et al. 2010

Geochem. J.

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A method for the rapid determination of Re-Os isotopes by multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) was developed. For Os measurements, samples were introduced into the plasma through conventional solution mode. The main Os memory occurs in the nebulizer; therefore, the use of a glass nebulizer rather than a Teflon nebulizer leads to a significant reduction in the Os memory effect. The Os memory is quickly and easily eliminated by washing the inlet system with 5% HCl-EtOH. The external reproducibility of the 187 Os/ 188 Os ratio of the Johnson-Matthey Chemical ICP (JMC) Os standard solution, as measured using the multi-ion counter system, is 0.07% (2σ, n = 12) for analyte amounts ranging from 0.1 to 1 ng total Os. Using MC-ICP-MS, the mean values of 187 Os/ 188 Os obtained for standards were found to be within analytical uncertainty of values obtained by negative thermal ionization mass spectrometry (N-TIMS). An improved mass-fractionation correction technique using Ir was applied to the isotopic analysis of Re. The present methods demonstrate the feasibility of MC-ICP-MS for precision measurements of the 187 Re-187 Os isotope system.

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“…Mass fractionation is traditionally modeled by linear, power or exponential laws (Russel et al, 1978). Marechal et al (1999) suggested that the exponential law provide a more consistent correction than the linear and the power laws. Wombacher et al (2003) also preferred the exponential law for describing Cd fractionation by MC-ICPMS.…”

Section: Interference Correctionsmentioning

confidence: 99%

“…The exponential law, described above in the case of a single element, was shown to be appropriate for this purpose in several studies (e.g. Marechal et al, 1999;Wombacher et al, 2003). The correction was performed using equation 5, in which a pair of silver isotopes is substituted for a pair of Cd isotopes.…”

Section: Instrumental Mass Fractionationmentioning

confidence: 99%

Cadmium isotopic composition in the ocean

Lacan

François

et al. 2006

Geochimica et Cosmochimica Acta

154

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The oceanic cycle of cadmium is still poorly understood, despite its importance for phytoplankton growth and paleoceanographic applications. As for other elements that are biologically recycled, variations in isotopic composition may bring unique insights. This article presents i) a protocol for the measurement of cadmium isotopic composition (Cd IC) in seawater and in phytoplankton cells; ii) the first Cd IC data in seawater, from two full depth stations, in the northwest Pacific and the northwest Mediterranean Sea; iii) the first Cd IC data in phytoplankton cells, cultured in vitro. The Cd IC variation range in seawater found at these stations is not greater than 1.5 ε Cd/amu units, only slightly larger than the mean uncertainty of measurement (0.8 ε Cd/amu ). Nevertheless, systematic variations of the Cd IC and concentration in the upper 300m of the northwest Pacific suggest the occurrence of Cd isotopic fractionation by phytoplankton uptake, with a fractionation factor of 1.6±1.4 ε Cd/amu units. This result is supported by the culture experiment data suggesting that freshwater phytoplankton (Chlamydomonas reinhardtii and Chlorella sp.) preferentially take up light Cd isotopes, with a fractionation factor of 3.4±1.4 ε Cd/amu units. Systematic variations of the Cd IC and hydrographic data between 300 and 700m in the northwest Pacific have been tentatively attributed to the mixing of the mesothermal (temperature maximum) water (ε Cd/amu =-0.9±0.8) with the North Pacific Intermediate Water (ε Cd/amu =0.5±0.8). In contrast, no significant Cd IC variation is found in the northwest Mediterranean Sea. This observation was attributed to the small surface Cd depletion by phytoplankton uptake and the similar Cd IC of the different water masses found at this site.Overall, these data suggest that i) phytoplankton uptake fractionates Cd isotopic composition to a measurable degree (fractionation factors of 1.6 and 3.4 ε Cd/amu units, for the in situ and culture experiment data, respectively), ii) an open ocean profile of Cd IC shows upper water column variations consistent with preferential uptake and regeneration of light Cd isotopes, and iii) different water masses may have different Cd IC. This isotopic system could therefore provide information on phytoplankton Cd uptake and on water mass trajectories and mixing in some areas of the ocean. However, the very small Cd IC variations found in this study indicate that applications of Cd isotopic composition to reveal aspects of the present or past Cd oceanic cycle will be very challenging and may require further analytical 3 improvements. Better precision could possibly be obtained with larger seawater samples, a better chemical separation of tin and a more accurate mass bias correction through the use of the double spiking technique.4

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Precise analysis of copper and zinc isotopic compositions by plasma-source mass spectrometry

Cited by 1,158 publications

References 45 publications

Resolving the Germanium Atomic Weight Disparity Using Multicollector ICPMS

Resolving the Germanium Atomic Weight Disparity Using Multicollector ICPMS

Simplified technique for the measurements of Re-Os isotope by multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS)

Cadmium isotopic composition in the ocean

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