|Abstract Title:||Mercury Stable Isotope Fingerprints of Cement Clinker Production Sector in China|
|Presenter Name:||Daiwei Ouyang|
|Company/Institution:||School of Environment, Tsinghua University|
|Session:||Mercury in contaminated sites|
Abstract Information :
Mercury stable isotope method is effective in tracing the sources of mercury in the environment. Establishing the mercury isotope fingerprints of atmospheric mercury emission sectors can promote the application of this method. As the largest anthropogenic mercury emission sector in China, the spatial difference of cement clinker production mercury isotope fingerprints remains unknown. This study collected the raw materials in cement clinker production plants, including 27 limestones, 14 other raw materials except for coals, and 2 cement clinkers. We then measured the mercury isotope compositions of these raw materials and then calculated the cement clinker production flue gas mercury isotope signatures in China in 2017 based on a mass balance method. We find that large spatial heterogeneity exists in the cement clinker production mercury isotope fingerprints. The ë202Hg and ?199Hg of limestones ranges from -1.91? to -0.17? and -0.69? to 0.01?, respectively. Besides, the limestones in the Southwest China are featured with ?199Hg ÷ 0 and ?199Hg/?201Hg ÷ 1, which are significantly different from the limestones in other regions of China with more negative ?199Hg and ?199Hg/?201Hg ranging from 1.5 to 1.6. For the cement clinker production flue gas, the ë202Hg ranges from -1.44? in Hebei province to -0.63? in Tianjin, and the ?199Hg of flue gas ranges from -0.26? in Henan province to 0.00? in Guizhou province. The ë202Hg and ?199Hg of cement clinker production flue gas are both significantly smaller than those of coal-fired boilers and zinc smelting. Our results highlight the necessity to consider the spatial differences and the likelihood to quantify the contributions of different sectors in regional mercury stable isotope tracing studies.