Direct measurement of Fe isotope compositions in iron-dominated minerals without column chromatography using MC-ICP-MS

Abstract

This study presents a practical method for high-precision Fe isotope determination without column chromatography purification for iron-dominated mineral samples using multi-collector inductively coupled plasma-mass spectrometry (MC-ICP-MS). A series of comparable...

High-precision iron isotopic measurements in low resolution using collision cell (CC)-MC-ICP-MS

“…JMC Fe (δ 56 Fe = 0.41 ± 0.12‰) 31 was used as an unknown sample for quality control. The Fe isotope ratios of NWU-Fe and IGGCAS-Fe are δ 56 Fe = 0.70 ± 0.03‰ 32 and δ 56 Fe = 0.658 ± 0.027‰ relative to the reference material IRMM-014, respectively. Furthermore, IGGCAS-Fe and JMC Fe have also been used to evaluate the precision of the method over a 6 month period.…”

A magnetite reference material for in situ Fe isotope analysis

“…52 Cr and 53 Cr were monitored to estimate the Cr content and the 54 Cr isobaric interference on 54 Fe, and 52 Cr ( 54 Cr/ 52 Cr = 0.028222) was used to subtract the interference of 54 Cr on 54 Fe isotopes. 20 The mass resolution was set at high resolution. For laser ablation measurements, the 206 nm laser wavelength was used.…”

“…The sample was analyzed at the SKLCD, Northwest University, using the method of Chen et al (2022). 20 Approximately 10 mg of magnetite powder was weighed in a 15 mL PFA beaker. The samples were dissolved in a 0.5 mL concentrated aqua regia (HCl : HNO 3 = 3 : 1, v/v) mixture at 80 °C for 12 h under closed conditions.…”

“…The SSB method was used for mass bias correction, and the NWU-Fe pure Fe solution was used as the bracketing standard. 20 Alfa-Fe1 was used as the unknown sample for data quality control. The measured d 56 Fe IRMM-014 of alfa-Fe1 is 0.54 ± 0.04& (2SD, n = 22) (Table 3), which was consistent with the reported value (0.53 ± 0.04&) within 2SD uncertainty.…”

Atomic spectrometry update: review of advances in atomic spectrometry and related techniques

“…The potential for Fe isotopes to be measured without chromatographic purification of iron-rich samples was investigated by Chen et al 178 Their study measured 40 Fe-based RMs using MC-ICP-MS. Following dissolution using HNO 3 and aqua regia , aliquots of these samples were purified using AG1-X8 cation exchange.…”