The emission of CS2, OCS and traces of SO2 from mixtures of fifteen different ground tire treads has been detected in laboratory experiments using gas chromatography/flame photometric detection (GC/FPD) and gas chromatography/mass spectrometry (GC/MS). Samples of ground tire particles (60-100 mesh) were flushed at different temperatures using either clean nitrogen gas or a mixture of 100 ppb O3 in N2. CS2 was the dominant sulfur gas detected in all of the experiments. OCS and CS2 emissions increased strongly with temperature and were independent of the presence of O3. In contrast, SO2 was observed only at high ozone levels. It is roughly estimated that tire wear may produce as much as 0.04 ± 0.004 Tg S (OCS) yr-1 or about 6.7% of the total OCS flux into the atmosphere. Therefore, this as yet undescribed automotive source may make a small but significant contribution to the atmospheric OCS budget.
Geophysical Research Letters
- Pub Date:
- May 1993
- Atmospheric Composition and Structure: Pollution-urban and regional;
- Atmospheric Composition and Structure: Troposphere-composition and chemistry;
- Atmospheric Composition and Structure: Geochemical cycles;
- Atmospheric Composition and Structure: Middle atmosphere-composition and chemistry