{"created":"2021-03-01T06:38:39.433398+00:00","id":30347,"links":{},"metadata":{"_buckets":{"deposit":"00d91660-2447-468c-94f5-f3de3d3579bc"},"_deposit":{"id":"30347","owners":[],"pid":{"revision_id":0,"type":"depid","value":"30347"},"status":"published"},"_oai":{"id":"oai:nagoya.repo.nii.ac.jp:00030347","sets":["879:1183:2103:2514"]},"author_link":["100766","100767","100768","100769","100770","100771","100772","100773","100774","100775"],"item_1615768549627":{"attribute_name":"出版タイプ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_9_alternative_title_19":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"Improved method of carbon extraction from water sample for radiocarbon measurement","subitem_alternative_title_language":"en"}]},"item_9_biblio_info_6":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2020-06","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"8","bibliographicPageStart":"1","bibliographicVolumeNumber":"4","bibliographic_titles":[{"bibliographic_title":"名古屋大学年代測定研究","bibliographic_titleLang":"ja"}]}]},"item_9_description_4":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"We improved the current method of CO2 extraction from DIC in water samples. The improved method is simple and cost-effective, and has no need of carrier gas. In addition, it can be adapted to various water samples with wide range of DIC concentration by using reaction flasks of various sizes. This has the merit of being able to analyze water having low DIC concentration. 　The CO2 extracted from water to headspace of a reaction flask is collected to cryogenic traps on a vacuum line. The gas in flask is introduced to a vacuum line not by bubbling or purging with a carrier gas but by expanding to the line using pressure difference. Water samples injected under the CO2-free condition and atmospheric condition showed the identical 14C concentration, indicating that blank of the new procedure is very low and considered to be negligible. The δ13C values of the extracted CO2 were related with CO2 yield, because of isotopic fractionation. Hence, high CO2 yield must be required, when the measured δ13C values should be used for discussion. On the other hand, 14C concentration of extracted CO2 showed the identical values within error range regardless of CO2 yield. It was concluded that the new procedure can be used as a suitable method for CO2 extraction from DIC in various water samples.","subitem_description_language":"en","subitem_description_type":"Abstract"},{"subitem_description":"水試料中のDICの14C測定を実施する上で必要なCO2抽出手法について、従来の手法を改良した。本手法の利点は、キャリアーガスを必要としないため、高圧ガスボンベが不要であること、これまで有機物試料の処理のために用いてきたCO2精製真空ラインに、簡単なユニットを追加するだけで実現可能であるため、安価かつ省スペースであることが挙げられる。また、処理を行う試料のDIC濃度の適用範囲が広いため、多様な試料に適用できる。ただし、あまりにもDIC濃度が高い場合には、現状の反応容器の形状では、δ13C測定のための試料処理への対応が難しい。処理速度については、DIC処理の専用の処理装置に軍配が上がるため、非常に多くの試料を処理するためには不向きである。本論では、試料を反応容器へ注入するときの汚染について、そして、CO2の収率と捕集のための繰り返し手順の回数・試料量・δ13C・14C濃度の関係について検証した。その結果、大気中で注入作業を行っても、大気CO2の混入による14C濃度の上昇は確認されず、注入作業をCO2フリーの環境下で実施しなくても良さそうであることがわかった。また、CO2の収率の低下によって、抽出されたCO2のδ13C値が変化することが示された。抽出されたCO2を用いて測定した14C濃度だけではなく、δ13Cもデータとして用いる場合には、収率による同位体比の変化に注意が必要であることがわかった。試料量が少ない場合には、拡散と捕集のサイクル数が少なくても収率が高くなるが、多くの試料へ適用することを考えると、通常の処理手順として、サイクル数は4回が適切であることが示された。この手法の抽出による14C濃度のばらつきは、AMS分析を実施する上で問題とならないレベルであると考えられる。","subitem_description_language":"ja","subitem_description_type":"Abstract"}]},"item_9_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.18999/nagubc.4.1","subitem_identifier_reg_type":"JaLC"}]},"item_9_publisher_32":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"名古屋大学宇宙地球環境研究所","subitem_publisher_language":"ja"}]},"item_9_select_15":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_select_item":"publisher"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"open access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_abf2"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"高橋, 浩","creatorNameLang":"ja"}],"nameIdentifiers":[{"nameIdentifier":"100766","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"半田, 宙子","creatorNameLang":"ja"}],"nameIdentifiers":[{"nameIdentifier":"100767","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"佐藤, 里名","creatorNameLang":"ja"}],"nameIdentifiers":[{"nameIdentifier":"100768","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"中村, 俊夫","creatorNameLang":"ja"}],"nameIdentifiers":[{"nameIdentifier":"100769","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"南, 雅代","creatorNameLang":"ja"}],"nameIdentifiers":[{"nameIdentifier":"100770","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Takahashi, Hiroshi A.","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"100771","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Handa, Hiroko","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"100772","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Sato, Rina","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"100773","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Nakamura, Toshio","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"100774","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Minami, Masayo","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"100775","nameIdentifierScheme":"WEKO"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2020-08-04"}],"displaytype":"detail","filename":"001-008_2019.pdf","filesize":[{"value":"1.5 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"001-008_2019.pdf","objectType":"fulltext","url":"https://nagoya.repo.nii.ac.jp/record/30347/files/001-008_2019.pdf"},"version_id":"349875f8-0596-404f-b2c2-fa927a228845"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"water sample","subitem_subject_scheme":"Other"},{"subitem_subject":"DIC","subitem_subject_scheme":"Other"},{"subitem_subject":"radiocarbon","subitem_subject_scheme":"Other"},{"subitem_subject":"CO2 extraction procedure","subitem_subject_scheme":"Other"},{"subitem_subject":"no carrier gas","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"水試料の放射性炭素濃度測定のための手法改良","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"水試料の放射性炭素濃度測定のための手法改良","subitem_title_language":"ja"}]},"item_type_id":"9","owner":"1","path":["2514"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2020-08-04"},"publish_date":"2020-08-04","publish_status":"0","recid":"30347","relation_version_is_last":true,"title":["水試料の放射性炭素濃度測定のための手法改良"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-01-16T04:23:50.072253+00:00"}