A highly sensitive MC-ICPMS method for Cd/Ca analyses of foraminiferal tests

Ripperger, S.; Rehkämper, Mark

doi:10.1039/b704267a

Cited by 10 publications

(22 citation statements)

References 28 publications

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“…A detailed description of the analytical techniques is provided by Ripperger and Rehkämper [2007]. Only a brief summary is thus given here, plus more comprehensive accounts of procedures that are specific to this study.…”

Section: Methodsmentioning

confidence: 99%

“…Following handpicking, the foraminiferal tests were crushed and cleaned with a leaching procedure [see Ripperger and Rehkämper , 2007] that is similar to techniques used in previous Cd/Ca studies [ Boyle and Rosenthal , 1996; Boyle and Keigwin , 1985; Martin and Lea , 2002]. About 50% of the foraminiferal material was lost during cleaning of sediment core samples, but when applied to in situ collected foraminiferal shells the losses were typically larger at up to 80%.…”

Section: Methodsmentioning

confidence: 99%

“…The removal of secondary ferromanganese (Fe‐Mn) oxide coatings and organic matter represent important steps to obtain reliable foraminiferal Cd/Ca records. Cleaning procedures therefore include both a reductive and an oxidative cleaning step [ Boyle and Rosenthal , 1996; Boyle and Keigwin , 1985; Martin and Lea , 2002; Ripperger and Rehkämper , 2007]. In principle, foraminiferal tests that were collected directly from the water column are not expected to have any Fe‐Mn oxide coatings that would need to be removed by reductive cleaning.…”

Section: Methodsmentioning

confidence: 99%

“…The effect of the reductive cleaning procedure on in situ collected G. ruber and G. sacculifer was evaluated by analyses of four individually processed samples from 0 to 100 m water depth (Table 1, samples 4s/1/2 and 4r/3/4). One sample of each species (4s/1 and 4r/3) was subjected to the full cleaning procedure [ Ripperger and Rehkämper , 2007], while the other two samples (4s/2 and 4r/4) were cleaned according to the standard cleaning protocol but without the reduction step. An intensified oxidative treatment was applied to all four samples, which consisted of five (normally two [see Ripperger and Rehkämper , 2007]) leaching steps.…”

Section: Methodsmentioning

confidence: 99%

“…In this study, we have carried out such comprehensive analyses on tests from tropical to transitional (non‐HNLC) regions. To this end, we used a recently developed method [ Ripperger and Rehkämper , 2007] to obtain Cd/Ca data for in situ sampled Globigerinoides ruber , Globigerinoides sacculifer and Globigerina bulloide s from the Arabian Sea and the North Atlantic. For comparison, we also analyzed the same species from core top samples taken at the same location.…”

Section: Introductionmentioning

confidence: 99%

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Cd/Ca ratios of in situ collected planktonic foraminiferal tests

et al. 2008

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[1] The Cd/Ca ratios of planktonic foraminiferal tests have been used to reconstruct surface water nutrient utilization and paleoproductivity. The reliability of this proxy has hitherto not been comprehensively studied, however. To fill this gap, we present novel Cd/Ca data for in situ sampled and sedimentary planktonic foraminifers of the species Globigerinoides ruber, G. sacculifer, Globigerina bulloides, Orbulina universa, and Globorotalia truncatulinoides from the Arabian Sea and the North Atlantic. The Cd/Ca ratios obtained for G. ruber sampled from the live habitat generally display a correlation with seawater phosphate content, but no such trend is observed for G. sacculifer. This distinct behavior may reflect different ecological niches or speciesspecific incorporation of Cd into the calcite shells of the organisms. The Cd/Ca ratios of G. ruber, G. sacculifer, and G. bulloides from surface sediments are consistently higher than those obtained for live collected specimens of the same species. Postdepositional alteration of the tests is unlikely to be responsible for these systematic differences. Rather, they appear to reflect a combination of factors, including the formation of calcite crusts with high Cd contents, the different timescales that are represented by in situ and sedimentary foraminiferal tests, and the dominance of tests from periods of high productivity in sediments. Our results also reveal higher Cd/Ca ratios for live G. ruber than for settling tests of the same species. This suggests that planktonic foraminiferal shells are partially dissolved while they individually settle through the water column. Sedimentary tests, however, will be less affected by dissolution processes because these shells are primarily deposited in mass sinking events, which feature much higher settling velocities than those experienced by single settling shells.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cd/Ca ratios of in situ collected planktonic foraminiferal tests

et al. 2008

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Current literature in mass spectrometry

2008

J. Mass Spectrom.

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In order to keep subscribers up‐to‐date with the latest developments in their field, John Wiley & Sons are providing a current awareness service in each issue of the journal. The bibliography contains newly published material in the field of mass spectrometry. Each bibliography is divided into 11 sections: 1 Reviews; 2 Instrumental Techniques & Methods; 3 Gas Phase Ion Chemistry; 4 Biology/Biochemistry: Amino Acids, Peptides & Proteins; Carbohydrates; Lipids; Nucleic Acids; 5 Pharmacology/Toxicology; 6 Natural Products; 7 Analysis of Organic Compounds; 8 Analysis of Inorganics/Organometallics; 9 Surface Analysis; 10 Environmental Analysis; 11 Elemental Analysis. Within each section, articles are listed in alphabetical order with respect to author (4 Weeks journals ‐ Search completed at 27th. Feb. 2008)

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Application of laser ablation multicollector inductively coupled plasma mass spectrometry for the measurement of calcium and lead isotope ratios in packaging for discriminatory purposes

Santamaría-Fernández¹,

Wolff

2010

Rapid Comm Mass Spectrometry

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The potential of high-precision calcium and lead isotope ratio measurements using laser ablation coupled to multicollector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) to aid distinction between four genuine and five counterfeit pharmaceutical packaging samples and further classification of counterfeit packaging samples has been evaluated. We highlight the lack of reference materials for LA-MC-ICP-MS isotope ratio measurements in solids. In this case the problem is minimised by using National Institute of Standards and Technology Standard Reference Material (NIST SRM) 915a calcium carbonate (as solid pellets) and NIST SRM610 glass disc for sample bracketing external standardisation. In addition, a new reference material, NIST SRM915b calcium carbonate, has been characterised in-house for Ca isotope ratios and is used as a reference sample. Significant differences have been found between genuine and counterfeit samples; the method allows detection of counterfeits and aids further classification of packaging samples. Typical expanded uncertainties for measured-corrected Ca isotope ratio values ((43)Ca/(44)Ca and (42)Ca/(44)Ca) were found to be below 0.06% (k = 2, 95% confidence) and below 0.2% for measured-corrected Pb isotope ratios ((207)Pb/(206)Pb and (208)Pb/(206)Pb). This is the first time that Ca isotope ratios have been measured in packaging materials using LA coupled to a multicollector (MC)-ICP-MS instrument. The use of LA-MC-ICP-MS for direct measurement of Ca and Pb isotopic variations in cardboard/ink in packaging has definitive potential to aid counterfeit detection and classification.

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A highly sensitive MC-ICPMS method for Cd/Ca analyses of foraminiferal tests

Cited by 10 publications

References 28 publications

Cd/Ca ratios of in situ collected planktonic foraminiferal tests

Cd/Ca ratios of in situ collected planktonic foraminiferal tests

Current literature in mass spectrometry

Application of laser ablation multicollector inductively coupled plasma mass spectrometry for the measurement of calcium and lead isotope ratios in packaging for discriminatory purposes

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