A method for determination of methyl chloride concentration in air trapped in ice cores

Takuya Saito; Yoko Yokouchi; Shuji Aoki; Takakiyo Nakazawa; Yoshiyuki Fujii; Okitsugu Watanabe

doi:10.1016/j.chemosphere.2005.08.075

A method for determination of methyl chloride concentration in air trapped in ice cores

Takuya Saito, Yoko Yokouchi, Shuji Aoki, Takakiyo Nakazawa, Yoshiyuki Fujii, Okitsugu Watanabe

SCI - Center for Atmospheric and Oceanic Studies

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

A method for measuring the concentration of methyl chloride (CH₃Cl) in air trapped in an ice core was developed. The method combines the air extraction by milling the ice core samples under vacuum and the analysis of the extracted air with a cryogenic preconcentration/gas chromatograph/mass spectrometry system. The method was applied to air from Antarctic ice core samples estimated to have been formed in the pre-industrial and/or early industrial periods. The overall precision of the method deduced from duplicate ice core analyses was estimated to be better than ±20 pptv. The measured CH₃Cl concentration of 528 ± 26 pptv was similar to the present-day concentration in the remote atmosphere as well as the CH₃Cl concentration over the past 300 years obtained from Antarctic firn air and ice core analyses.

Original language	English
Pages (from-to)	1209-1213
Number of pages	5
Journal	Chemosphere
Volume	63
Issue number	7
DOIs	https://doi.org/10.1016/j.chemosphere.2005.08.075
Publication status	Published - 2006 May

Keywords

Antarctica
Gas chromatography
Methyl halide
Paleoclimate
Stratospheric ozone

ASJC Scopus subject areas

Environmental Engineering
Environmental Chemistry
Chemistry(all)
Pollution
Health, Toxicology and Mutagenesis

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title = "A method for determination of methyl chloride concentration in air trapped in ice cores",

abstract = "A method for measuring the concentration of methyl chloride (CH3Cl) in air trapped in an ice core was developed. The method combines the air extraction by milling the ice core samples under vacuum and the analysis of the extracted air with a cryogenic preconcentration/gas chromatograph/mass spectrometry system. The method was applied to air from Antarctic ice core samples estimated to have been formed in the pre-industrial and/or early industrial periods. The overall precision of the method deduced from duplicate ice core analyses was estimated to be better than ±20 pptv. The measured CH3Cl concentration of 528 ± 26 pptv was similar to the present-day concentration in the remote atmosphere as well as the CH3Cl concentration over the past 300 years obtained from Antarctic firn air and ice core analyses.",

keywords = "Antarctica, Gas chromatography, Methyl halide, Paleoclimate, Stratospheric ozone",

author = "Takuya Saito and Yoko Yokouchi and Shuji Aoki and Takakiyo Nakazawa and Yoshiyuki Fujii and Okitsugu Watanabe",

note = "Funding Information: We thank the members of the 42nd Japanese Antarctic Research Expeditions for the ice core drilling. We also thank Dr. T. Machida and Dr. Y. Tohjima of the National Institute for Environmental Studies for valuable discussion and for the use of the CO 2 standard gas. This study was supported in part by the Grant for Environmental Research Projects (the Sumitomo Foundation). Copyright: Copyright 2020 Elsevier B.V., All rights reserved.",

year = "2006",

month = may,

doi = "10.1016/j.chemosphere.2005.08.075",

language = "English",

volume = "63",

pages = "1209--1213",

journal = "Chemosphere",

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T1 - A method for determination of methyl chloride concentration in air trapped in ice cores

AU - Saito, Takuya

AU - Yokouchi, Yoko

AU - Aoki, Shuji

AU - Nakazawa, Takakiyo

AU - Fujii, Yoshiyuki

AU - Watanabe, Okitsugu

N1 - Funding Information: We thank the members of the 42nd Japanese Antarctic Research Expeditions for the ice core drilling. We also thank Dr. T. Machida and Dr. Y. Tohjima of the National Institute for Environmental Studies for valuable discussion and for the use of the CO 2 standard gas. This study was supported in part by the Grant for Environmental Research Projects (the Sumitomo Foundation). Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2006/5

Y1 - 2006/5

N2 - A method for measuring the concentration of methyl chloride (CH3Cl) in air trapped in an ice core was developed. The method combines the air extraction by milling the ice core samples under vacuum and the analysis of the extracted air with a cryogenic preconcentration/gas chromatograph/mass spectrometry system. The method was applied to air from Antarctic ice core samples estimated to have been formed in the pre-industrial and/or early industrial periods. The overall precision of the method deduced from duplicate ice core analyses was estimated to be better than ±20 pptv. The measured CH3Cl concentration of 528 ± 26 pptv was similar to the present-day concentration in the remote atmosphere as well as the CH3Cl concentration over the past 300 years obtained from Antarctic firn air and ice core analyses.

AB - A method for measuring the concentration of methyl chloride (CH3Cl) in air trapped in an ice core was developed. The method combines the air extraction by milling the ice core samples under vacuum and the analysis of the extracted air with a cryogenic preconcentration/gas chromatograph/mass spectrometry system. The method was applied to air from Antarctic ice core samples estimated to have been formed in the pre-industrial and/or early industrial periods. The overall precision of the method deduced from duplicate ice core analyses was estimated to be better than ±20 pptv. The measured CH3Cl concentration of 528 ± 26 pptv was similar to the present-day concentration in the remote atmosphere as well as the CH3Cl concentration over the past 300 years obtained from Antarctic firn air and ice core analyses.

KW - Antarctica

KW - Gas chromatography

KW - Methyl halide

KW - Paleoclimate

KW - Stratospheric ozone

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JO - Chemosphere

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SN - 0045-6535

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ER -

A method for determination of methyl chloride concentration in air trapped in ice cores

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Keywords

ASJC Scopus subject areas

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