Stable isotope compositions of cadmium in geological materials and meteorites determined by multiple-collector ICPMS

Wombacher, Frank; Rehkämper, Mark; Mezger, Klaus; Münker, Carsten

doi:10.1016/s0016-7037(03)00389-2

Cited by 240 publications

(307 citation statements)

References 59 publications

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“…However, considering the range of variation of our dataset (<0.5‰ amu -1 ), the discrepancies between this rigorous approach and the simple mass difference normalization used here are negligible (Wombacher and Rehkämper, 2004). The reference material used in this work is the JMC standard solution (Wombacher et al, 2003).…”

Section: Spectrometric Analysismentioning

confidence: 99%

“…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. We will show in section 3.2.2. that the exponential law was also the most suitable for Cd fractionation corrections.…”

Section: Interference Correctionsmentioning

confidence: 99%

“…Instead, we estimated f using two Cd isotopes free of isobaric interference ( 110 Cd and 111 Cd) and assumed that f calculated for Cd holds for Sn (as previously done by Wombacher et al 2003). There is some level of circularity in this procedure, since our ultimate goal is to measure small natural variations in Cd isotopic composition and here we assume that there is no natural Cd isotopic fractionation.…”

Section: Interference Correctionsmentioning

confidence: 99%

“…The validity of the Sn interference correction was assessed following the method proposed by Wombacher et al (2003). Cadmium isotopic ratios corrected for Sn interferences were normalized using the exponential law to a "true" Cd ratio.…”

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%

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Cadmium isotopic composition in the ocean

Lacan

François

et al. 2006

Geochimica et Cosmochimica Acta

158

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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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Section: Spectrometric Analysismentioning

confidence: 99%

Section: Interference Correctionsmentioning

confidence: 99%

Section: Interference Correctionsmentioning

confidence: 99%

Section: Interference Correctionsmentioning

confidence: 99%

Section: Instrumental Mass Fractionationmentioning

confidence: 99%

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Cadmium isotopic composition in the ocean

Lacan

François

et al. 2006

Geochimica et Cosmochimica Acta

158

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Cadmium: Inorganic & Coordination Chemistry

Borsari¹

2005

Encyclopedia of Inorganic Chemistry

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This article provides an overview on the chemistry of cadmium. Cadmium is a naturally occurring metal elements, being the 67th most abundant element in the earth's crust, and it is found in several minerals. Occurrence, production and applications have been surveyed, also in the light of toxicological and environmental risks joined to uses of cadmium. The usual oxidation state of cadmium is 2+ and its chemistry closely resembles that of zinc. The versatile coordination ability allows a wide variety of structure. Therefore, emphasis is placed on stereochemical aspects of cadmium chemistry, in particular on 1D, 2D, and 3D architectures resulting from assembly of Cd 2+ –ligand(s) units. The main compounds and complexes, ordered by metal oxidation state and ligand donor atom, have been examined in their properties and structural aspects, both in solution and in solid state.

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The Cd isotope composition of atmospheric aerosols from the Tropical Atlantic Ocean

Bridgestock

Rehkämper

Flierdt

et al. 2017

Geophysical Research Letters

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Stable isotope compositions can potentially be used to trace atmospheric Cd inputs to the surface ocean and anthropogenic Cd emissions to the atmosphere. Both of these applications may provide valuable insights into the effects of anthropogenic activities on the cycling of Cd in the environment. However, a lack of constraints for the Cd isotope compositions of atmospheric aerosols is currently hindering such studies. Here we present stable Cd isotope data for aerosols collected over the Tropical Atlantic Ocean. The samples feature variable proportions of mineral dust‐derived and anthropogenic Cd, yet exhibit similar isotope compositions, thus negating the distinction of these Cd sources by using isotopic signatures in this region. Isotopic variability between these two atmospheric Cd sources may be identified in other areas, and thus warrants further investigation. Regardless, these data provide important initial constraints on the isotope composition of atmospheric Cd inputs to the ocean.

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Stable isotope compositions of cadmium in geological materials and meteorites determined by multiple-collector ICPMS

Cited by 240 publications

References 59 publications

Cadmium isotopic composition in the ocean

Cadmium isotopic composition in the ocean

Cadmium: Inorganic & Coordination Chemistry

The Cd isotope composition of atmospheric aerosols from the Tropical Atlantic Ocean

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