| Metrology area, Sub-field | Chemistry and Biology, Gases |
| Description | Dimethyl sulfide in nitrogen |
| Time of measurements | 2020 - 2021 |
| Status | Report in progress, draft B |
| References | |
| Measurand | Amount-of-substance fraction of dimethyl sulfide in nitrogen Nominal value: 5 nmol/mol |
| Transfer device | High pressure aluminum cylinders |
| Comparison type | Key Comparison |
| Consultative Committee | CCQM (Consultative Committee for Amount of Substance) |
| Conducted by | CCQM (Consultative Committee for Amount of Substance) |
| Comments | Dimethyl sulfide (DMS) is produced by the enzymatic breakdown of its precursor, dimethylsulphoniopropionate (DMSP) which is a metabolite in marine phytoplankton. DMS is oxidized by radicals (OH, NO3) to form its oxidation products (less volatile compounds) such as sulfur dioxide, dimethyl sulfoxide, dimethyl sulfone, methanesulfonic acid and sulfuric acid. Sulfuric acid contributes to the formation of atmospheric aerosols which influence on the atmosphere radiation budget by altering aerosol properties, cloud properties, and interactions with clouds. Sulfur compounds including DMS exist as important impurities in hydrogen fuel; total sulphur must be less than 4 nmol/mol to avoid degrading the platinum catalyst present in a fuel cell system. DMS presents at trace levels (pmol/mol or nmol/mol) in the atmosphere and hydrogen fuel. Therefore, it is important to develop measurement capability in order to quantify DMS in gas mixtures at trace levels for studying climate change and developing high quality hydrogen fuel. This comparison is designed to underpin the measurement capability of 5 nmol/mol DMS in nitrogen. |
| Pilot institute |
KRISS
Korea Research Institute of Standards and Science Korea, Republic of |
| Contact person | Sangil Lee +82 42 868 5864 |
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