2015
DOI: 10.1007/s00216-014-8448-6
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A practical guide for the design and implementation of the double-spike technique for precise determination of molybdenum isotope compositions of environmental samples

Abstract: The isotopic double-spike method allows for the determination of stable isotope ratios by multi-collector inductively coupled plasma-mass spectrometry (MC-ICP-MS) with accuracy and precision in the range of ∼0.02 ‰ amu(-1), but its adoption has been hindered by the perceived difficulties in double-spike calibration and implementation. To facilitate the implementation of the double-spike approach, an explanation of the calibration and validation of a (97)Mo-(100)Mo double-spike protocol is given in more detail … Show more

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Cited by 30 publications
(32 citation statements)
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“…In addition, trace amounts of Mo and Zn were found overlapping with the Ga fraction in NOD-A-1 (Figure 1a1) and BCR-2 ( Figure 1d1). According to the previous studies, Mo and Zn should not be eluted by 2.1 mol l -1 HCl, since Mo and Zn are highly absorbed on AG MP-1 resin in a diluted HCl medium (Skierszkan et al 2015, Zhu et al 2015 Figure 1a2,d2 shows, this 'leaked' Mo and Zn, as well as Fe and Ge, can be completely separated from Ga by the following AG 50W-X8 resin column. It should be noted that the ferromanganese nodule sample NOD-A-1 has a relative low Ga content (6.3 lg g -1 ) and extremely high Fe content (58.05%).…”
Section: Ga Chemical Separation Methods and Its Calibrationmentioning
confidence: 85%
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“…In addition, trace amounts of Mo and Zn were found overlapping with the Ga fraction in NOD-A-1 (Figure 1a1) and BCR-2 ( Figure 1d1). According to the previous studies, Mo and Zn should not be eluted by 2.1 mol l -1 HCl, since Mo and Zn are highly absorbed on AG MP-1 resin in a diluted HCl medium (Skierszkan et al 2015, Zhu et al 2015 Figure 1a2,d2 shows, this 'leaked' Mo and Zn, as well as Fe and Ge, can be completely separated from Ga by the following AG 50W-X8 resin column. It should be noted that the ferromanganese nodule sample NOD-A-1 has a relative low Ga content (6.3 lg g -1 ) and extremely high Fe content (58.05%).…”
Section: Ga Chemical Separation Methods and Its Calibrationmentioning
confidence: 85%
“…In addition, trace amounts of Mo and Zn were found overlapping with the Ga fraction in NOD‐A‐1 (Figure a1) and BCR‐2 (Figure d1). According to the previous studies, Mo and Zn should not be eluted by 2.1 mol l −1 HCl, since Mo and Zn are highly absorbed on AG MP‐1 resin in a diluted HCl medium (Skierszkan et al , Zhu et al , Chen et al ). This may be attributed to the overload of Mo and Zn, given the extremely high ratios of [Mo]/[Ga] and [Zn]/[Ga] in NOD‐A‐1, and [Mo]/[Ga] in BCR‐2.…”
Section: Resultsmentioning
confidence: 99%
“…During this period, the δ 53 Cr SCP value fluctuated from session to session, with a 2 standard deviation (2SD) of 0.10‰ ( N = 184, Figure A). Similar fluctuations have been reported by other labs using the double‐spike technique; these fluctuations may be attributed to mass fractionation changes that do not follow the exponential law . By normalizing every measurement of the standard to the mean of each session, the variations can largely be removed with a 2SD value of 0.04‰ ( N = 184, Figure B).…”
Section: Resultsmentioning
confidence: 99%
“…It is traditionally believed that the accuracy of the double‐spike technique requires proper calibration of the isotopic composition of the double spike for instrumental mass fractionation . There are several ways to estimate the isotopic composition of the double spike, including calibrating it against an isotopic standard of the target element using a recommended value (IUPAC isotope composition value, in most cases) of certain isotopic ratios, or doping with an isotopic standard of a different element to correct for instrumental mass fractionation . In these approaches, correction of the instrumental mass fractionation on the double spike is thought to be necessary.…”
Section: Introductionmentioning
confidence: 99%
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