A Potential New Chalcopyrite Reference Material for LA‐MC‐ICP‐MS Copper Isotope Ratio Measurement. Issue 2 (5th March 2021)

• Record Type: Journal Article
• Authors: Bao, Zhian; Lv, Nan; Chen, Kaiyun; Luan, Yan; Sun, Xiaohui; Zong, Chunlei; Yuan, Honglin
• Is Part Of: Geostandards and geoanalytical research. Volume 45:Issue 2(2021)
• Page Start: 401
• Page End: 418
• Publication Date: 2021-03-05
• Subjects: chalcopyrite -- reference material -- TC1725 -- copper isotope -- fsLA‐MC‐ICP‐MS; Analytical geochemistry -- Periodicals; Géochimie analytique -- Périodiques; 551.9
• DOI: 10.1111/ggr.12372
• Languages: English
• ISSNs: 1639-4488

Abstract

Abstract : 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. Abstract : Key Points TC1725 chalcopyrite is a potential reference material for in situ copper isotope measurement. The recommended δ 65 Cu value for TC1725 is ‐0.06 ± 0.03‰ (2 s ).