Long-term stability evaluation of 0.5-7.0 nmol/mol dimethyl sulfide primary standard gas mixtures by comparison with traceable dynamically diluted gas mixtures

Mi Eon Kim, Ji Hwan Kang, Yong Doo Kim, Dong Soo Lee, Sangil Lee

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Dimethyl sulfide (DMS) is a crucial precursor in the formation of aerosols that play important roles in climate change. Stable and traceable primary standard gas mixtures (PSMs) are critical for accurate measurement of the trace amounts of reactive DMS reported at sub-nanomole per mole (nmol/mol) levels at remote monitoring sites. However, the preparation of DMS at ambient levels in high-pressure cylinders is challenging because of its instability. This study examined the long-term stability of 0.5–7.0 nmol/mol DMS PSMs prepared in specially treated cylinders. Ten months after the PSM preparation, the DMS PSMs were compared with traceable dynamically diluted gas mixtures (DDMs). The DMS PSMs at 2–7 nmol/mol levels were stable for 10 months with uncertainties of less than 2.5% (k = 2). However, the amount-of-substance fraction (i.e., mole fraction) of the DMS PSM at 0.5 nmol/mol was 5.4% less than the gravimetrically determined mole fraction, which exceeds the uncertainty of 3.5%. These findings indicate that DMS PSMs at 2–7 nmol/mol levels are sufficiently stable for use as primary standards for long-term monitoring of trace-level DMS in remote areas, whereas DMS PSM at 0.5 nmol/mol is not sufficiently stable.

Original languageEnglish
Pages (from-to)305-312
Number of pages8
JournalBulletin of the Korean Chemical Society
Volume39
Issue number3
DOIs
Publication statusPublished - 2018 Mar

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Gas mixtures
dimethyl sulfide
Monitoring
Aerosols
Climate change

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

Cite this

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title = "Long-term stability evaluation of 0.5-7.0 nmol/mol dimethyl sulfide primary standard gas mixtures by comparison with traceable dynamically diluted gas mixtures",
abstract = "Dimethyl sulfide (DMS) is a crucial precursor in the formation of aerosols that play important roles in climate change. Stable and traceable primary standard gas mixtures (PSMs) are critical for accurate measurement of the trace amounts of reactive DMS reported at sub-nanomole per mole (nmol/mol) levels at remote monitoring sites. However, the preparation of DMS at ambient levels in high-pressure cylinders is challenging because of its instability. This study examined the long-term stability of 0.5–7.0 nmol/mol DMS PSMs prepared in specially treated cylinders. Ten months after the PSM preparation, the DMS PSMs were compared with traceable dynamically diluted gas mixtures (DDMs). The DMS PSMs at 2–7 nmol/mol levels were stable for 10 months with uncertainties of less than 2.5{\%} (k = 2). However, the amount-of-substance fraction (i.e., mole fraction) of the DMS PSM at 0.5 nmol/mol was 5.4{\%} less than the gravimetrically determined mole fraction, which exceeds the uncertainty of 3.5{\%}. These findings indicate that DMS PSMs at 2–7 nmol/mol levels are sufficiently stable for use as primary standards for long-term monitoring of trace-level DMS in remote areas, whereas DMS PSM at 0.5 nmol/mol is not sufficiently stable.",
author = "Kim, {Mi Eon} and Kang, {Ji Hwan} and Kim, {Yong Doo} and Lee, {Dong Soo} and Sangil Lee",
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Long-term stability evaluation of 0.5-7.0 nmol/mol dimethyl sulfide primary standard gas mixtures by comparison with traceable dynamically diluted gas mixtures. / Kim, Mi Eon; Kang, Ji Hwan; Kim, Yong Doo; Lee, Dong Soo; Lee, Sangil.

In: Bulletin of the Korean Chemical Society, Vol. 39, No. 3, 03.2018, p. 305-312.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Long-term stability evaluation of 0.5-7.0 nmol/mol dimethyl sulfide primary standard gas mixtures by comparison with traceable dynamically diluted gas mixtures

AU - Kim, Mi Eon

AU - Kang, Ji Hwan

AU - Kim, Yong Doo

AU - Lee, Dong Soo

AU - Lee, Sangil

PY - 2018/3

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N2 - Dimethyl sulfide (DMS) is a crucial precursor in the formation of aerosols that play important roles in climate change. Stable and traceable primary standard gas mixtures (PSMs) are critical for accurate measurement of the trace amounts of reactive DMS reported at sub-nanomole per mole (nmol/mol) levels at remote monitoring sites. However, the preparation of DMS at ambient levels in high-pressure cylinders is challenging because of its instability. This study examined the long-term stability of 0.5–7.0 nmol/mol DMS PSMs prepared in specially treated cylinders. Ten months after the PSM preparation, the DMS PSMs were compared with traceable dynamically diluted gas mixtures (DDMs). The DMS PSMs at 2–7 nmol/mol levels were stable for 10 months with uncertainties of less than 2.5% (k = 2). However, the amount-of-substance fraction (i.e., mole fraction) of the DMS PSM at 0.5 nmol/mol was 5.4% less than the gravimetrically determined mole fraction, which exceeds the uncertainty of 3.5%. These findings indicate that DMS PSMs at 2–7 nmol/mol levels are sufficiently stable for use as primary standards for long-term monitoring of trace-level DMS in remote areas, whereas DMS PSM at 0.5 nmol/mol is not sufficiently stable.

AB - Dimethyl sulfide (DMS) is a crucial precursor in the formation of aerosols that play important roles in climate change. Stable and traceable primary standard gas mixtures (PSMs) are critical for accurate measurement of the trace amounts of reactive DMS reported at sub-nanomole per mole (nmol/mol) levels at remote monitoring sites. However, the preparation of DMS at ambient levels in high-pressure cylinders is challenging because of its instability. This study examined the long-term stability of 0.5–7.0 nmol/mol DMS PSMs prepared in specially treated cylinders. Ten months after the PSM preparation, the DMS PSMs were compared with traceable dynamically diluted gas mixtures (DDMs). The DMS PSMs at 2–7 nmol/mol levels were stable for 10 months with uncertainties of less than 2.5% (k = 2). However, the amount-of-substance fraction (i.e., mole fraction) of the DMS PSM at 0.5 nmol/mol was 5.4% less than the gravimetrically determined mole fraction, which exceeds the uncertainty of 3.5%. These findings indicate that DMS PSMs at 2–7 nmol/mol levels are sufficiently stable for use as primary standards for long-term monitoring of trace-level DMS in remote areas, whereas DMS PSM at 0.5 nmol/mol is not sufficiently stable.

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