极地研究2018，Vol.30Issue(2)：210-219,10.DOI:10.13679/j.jdyj.20170043
低温冷阱大气水汽收集技术及其在水稳定同位素研究中的应用
COLD TRAP TECHNIQUE FOR COLLECTING ATMOSPHERIC WATER VAPOR AND ITS APPLICATIONS IN THE STUDY OF WATER STABLE ISOTOPES
摘要
Abstract
This study systematically introduces the cold trap technique for use in the collection of atmospheric water vapor, including its basic principles, experimental methods, error estimates, and applications in the study of water stable isotopes. Atmospheric water vapor can condense completely in the cold trap by in-creasing both the condensation surface area (by filling with small glass beads) and the condensation time under conditions of cold temperature (?80℃). The condensed water sublimates or evaporates by heating the cold trap, and then the sublimated or evaporated water vapor re-condenses in a sample bottle under vacuum conditions and cold temperatures (?80℃). The error of the stable isotopic composition in the collected water vapor derives mainly from two aspects: the lost saturated vapor during collection and the ambient air in the bottle mixed with the sampled water. The magnitudes of the above two errors were estimated theoretically in the study. Water vapor collection using a cold trap has important applications in the study of water stable isotopes including achieving high-accuracyδ17O data in atmospheric water vapor, obtaining high-accuracy isotopic composition of atmospheric water vapor in the remote areas of polar ice sheets where vapor con-centration is very low, and verifying the isotopic measurements of atmospheric water vapor by laser absorp-tion spectrometers.关键词
低温冷阱/水汽收集/水汽稳定同位素Key words
cold trap/water vapor collection/water vapor stable isotopes引用本文复制引用
胡家权,庞洪喜..低温冷阱大气水汽收集技术及其在水稳定同位素研究中的应用[J].极地研究,2018,30(2):210-219,10.基金项目
国家自然科学基金(41622605, 41771031),南北极环境综合考察与评估专项(CHINARE2017-02-02)和江苏省自然科学基金(BK20151387)资助 （41622605, 41771031）
