Guaciara M Santos, Christopher A Leong, Pieter M Grootes, Martin Seiler, Helene Svarva, Marie-Josée Nadeau
{"title":"对大气二氧化碳样品的 TRONDHEIM CaCO3 预沉淀物的放射性碳梯级凝聚氧化法和傅立叶分析：进一步的研究和见解","authors":"Guaciara M Santos, Christopher A Leong, Pieter M Grootes, Martin Seiler, Helene Svarva, Marie-Josée Nadeau","doi":"10.1017/rdc.2023.106","DOIUrl":null,"url":null,"abstract":"<p>Eight atmospheric carbon dioxide samples (as calcium carbonate—CaCO<span>3</span>—precipitates) from Lindesnes site (58ºN, 7ºE), belonging to 1963 and 1980 (four samples from each year) and stored at the National Laboratory for Age Determination (NTNU), have been reevaluated through radiocarbon (<span>14</span>C) analysis. Previous <span>14</span>C results indicated the presence of a contaminant, which was not removed through different chemical cleansing procedures (e.g., hydrochloric acid—HCl and/or hydrogen peroxide—H<span>2</span>O<span>2</span>). Here, we present a follow up investigation using <span>14</span>C step-combustion and Fourier-transform infrared spectroscopy (FTIR) analysis. Results from <span>14</span>C data indicate unsuccessful removal of the contaminant, while further FTIR analysis displayed the presence of moisture. This finding alludes to the possibility that the contaminant is of ambient air-CO<span>2</span> deeply embedded in CaCO<span>3</span> powders (within clogged CaCO<span>3</span> pores and/or bonded to the lattice). Samples were found exposed to air-CO<span>2</span> and humidity. These conditions may have lasted for years, possibly even decades, leading to the <span>14</span>C offsets detected here.</p>","PeriodicalId":21020,"journal":{"name":"Radiocarbon","volume":"7 1","pages":""},"PeriodicalIF":2.0000,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"RADIOCARBON STEP-COMBUSTION OXIDATION METHOD AND FTIR ANALYSIS OF TRONDHEIM CaCO3 PRECIPITATES OF ATMOSPHERIC CO2 SAMPLES: FURTHER INVESTIGATIONS AND INSIGHTS\",\"authors\":\"Guaciara M Santos, Christopher A Leong, Pieter M Grootes, Martin Seiler, Helene Svarva, Marie-Josée Nadeau\",\"doi\":\"10.1017/rdc.2023.106\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Eight atmospheric carbon dioxide samples (as calcium carbonate—CaCO<span>3</span>—precipitates) from Lindesnes site (58ºN, 7ºE), belonging to 1963 and 1980 (four samples from each year) and stored at the National Laboratory for Age Determination (NTNU), have been reevaluated through radiocarbon (<span>14</span>C) analysis. Previous <span>14</span>C results indicated the presence of a contaminant, which was not removed through different chemical cleansing procedures (e.g., hydrochloric acid—HCl and/or hydrogen peroxide—H<span>2</span>O<span>2</span>). Here, we present a follow up investigation using <span>14</span>C step-combustion and Fourier-transform infrared spectroscopy (FTIR) analysis. Results from <span>14</span>C data indicate unsuccessful removal of the contaminant, while further FTIR analysis displayed the presence of moisture. This finding alludes to the possibility that the contaminant is of ambient air-CO<span>2</span> deeply embedded in CaCO<span>3</span> powders (within clogged CaCO<span>3</span> pores and/or bonded to the lattice). Samples were found exposed to air-CO<span>2</span> and humidity. These conditions may have lasted for years, possibly even decades, leading to the <span>14</span>C offsets detected here.</p>\",\"PeriodicalId\":21020,\"journal\":{\"name\":\"Radiocarbon\",\"volume\":\"7 1\",\"pages\":\"\"},\"PeriodicalIF\":2.0000,\"publicationDate\":\"2023-12-12\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Radiocarbon\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://doi.org/10.1017/rdc.2023.106\",\"RegionNum\":3,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"GEOCHEMISTRY & GEOPHYSICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Radiocarbon","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1017/rdc.2023.106","RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}
RADIOCARBON STEP-COMBUSTION OXIDATION METHOD AND FTIR ANALYSIS OF TRONDHEIM CaCO3 PRECIPITATES OF ATMOSPHERIC CO2 SAMPLES: FURTHER INVESTIGATIONS AND INSIGHTS
Eight atmospheric carbon dioxide samples (as calcium carbonate—CaCO3—precipitates) from Lindesnes site (58ºN, 7ºE), belonging to 1963 and 1980 (four samples from each year) and stored at the National Laboratory for Age Determination (NTNU), have been reevaluated through radiocarbon (14C) analysis. Previous 14C results indicated the presence of a contaminant, which was not removed through different chemical cleansing procedures (e.g., hydrochloric acid—HCl and/or hydrogen peroxide—H2O2). Here, we present a follow up investigation using 14C step-combustion and Fourier-transform infrared spectroscopy (FTIR) analysis. Results from 14C data indicate unsuccessful removal of the contaminant, while further FTIR analysis displayed the presence of moisture. This finding alludes to the possibility that the contaminant is of ambient air-CO2 deeply embedded in CaCO3 powders (within clogged CaCO3 pores and/or bonded to the lattice). Samples were found exposed to air-CO2 and humidity. These conditions may have lasted for years, possibly even decades, leading to the 14C offsets detected here.
期刊介绍：
Radiocarbon serves as the leading international journal for technical and interpretive articles, date lists, and advancements in 14C and other radioisotopes relevant to archaeological, geophysical, oceanographic, and related dating methods. Established in 1959, it has published numerous seminal works and hosts the triennial International Radiocarbon Conference proceedings. The journal also features occasional special issues. Submissions encompass regular articles such as research reports, technical descriptions, and date lists, along with comments, letters to the editor, book reviews, and laboratory lists.
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