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A Potential New Chalcopyrite Reference Material for LA‐MC‐ICP‐MS Copper Isotope Ratio Measurement
Author(s) -
Bao Zhian,
Lv Nan,
Chen Kaiyun,
Luan Yan,
Sun Xiaohui,
Zong Chunlei,
Yuan Honglin
Publication year - 2021
Publication title -
geostandards and geoanalytical research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.037
H-Index - 73
eISSN - 1751-908X
pISSN - 1639-4488
DOI - 10.1111/ggr.12372
Subject(s) - chalcopyrite , analytical chemistry (journal) , inductively coupled plasma mass spectrometry , copper , isotope , chemistry , inductively coupled plasma , mineralogy , mass spectrometry , chromatography , plasma , physics , organic chemistry , quantum mechanics
A new natural chalcopyrite reference material TC1725 is prepared for in situ Cu isotope measurement by femtosecond laser ablation multi‐collector inductively coupled plasma‐mass spectrometry (fsLA‐MC‐ICP‐MS). Detailed textural examination and major element determination suggest the TC1725 chalcopyrite grains have no growth rim or zoning. The chalcopyrite grain is homogeneous with respect to Cu isotopes based on a large number of measurements performed by bulk solution nebuliser (SN)‐MC‐ICP‐MS, single‐grain SN‐MC‐ICP‐MS and fsLA‐MC‐ICP‐MS. The traditional bulk isotope analyses by SN‐MC‐ICP‐MS yielded a mean δ 65 Cu value of −0.06 ± 0.03‰ (2 s , n = 132). Randomly selected single chalcopyrite grain of TC1725 determined by SN‐MC‐ICP‐MS without column chromatography gave a mean δ 65 Cu value of −0.06 ± 0.04‰ (2 s , n = 188). The intermediate measurement precision for four measurement sessions was better than 0.04‰ (2 s ), suggesting TC1725 chalcopyrite is suitable as a microanalysis reference material for Cu isotope measurement. The mean δ 65 Cu value determined by fsLA‐MC‐ICP‐MS analyses on different individual chalcopyrite mounts and strips was −0.06 ± 0.03‰ (2 s , n = 393), consistent with the bulk isotope composition within uncertainty. The recommended mean δ 65 Cu value for this chalcopyrite reference material is −0.06 ± 0.03‰ (2 s , n = 132) as determined by bulk SN‐MC‐ICP‐MS.