Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-19-315-2019 |
Diel variation in mercury stable isotope ratios records photoreduction of PM2.5-bound mercury | |
Huang, Qiang1,2; Chen, Jiubin1,3; Huang, Weilin4; Reinfelder, John R.4; Fu, Pingqing5; Yuan, Shengliu1; Wang, Zhongwei1; Yuan, Wei1; Cai, Hongming1; Ren, Hong5; Sun, Yele5; He, Li6 | |
2019-01-09 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2019 |
卷号 | 19期号:1页码:315-325 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA |
英文摘要 | Mercury (Hg) bound to fine aerosols (PM2.5-Hg) may undergo photochemical reaction that causes isotopic fractionation and obscures the initial isotopic signatures. In this study, we quantified Hg isotopic compositions for 56 PM2.5 samples collected between 15 September and 16 October 2015 from Beijing, China, among which 26 were collected during daytime (between 08:00 and 18:30 LT) and 30 during night (between 19:00 and 07:30 LT). The results show that diel variation was statistically significant (p < 0.05) for Hg content, Delta Hg-199 and Delta Hg-200, with Hg content during daytime (0.32 +/- 0.14 mu g g(-1)) lower than at night (0.48 +/- 0.24 mu g g(-1)) and Delta Hg-199 and Delta Hg-200 values during day-time (mean of 0.26 parts per thousand +/- 0.40 parts per thousand and 0.09 parts per thousand +/- 0.06%, respectively) higher than during nighttime (0.04 parts per thousand +/- 0.22 parts per thousand and 0.06 parts per thousand +/- 0.05 parts per thousand, respectively), whereas PM2.5 concentrations and delta Hg-202 values showed insignificant (p > 0.05) diel variation. Geochemical characteristics of the samples and the air mass backward trajectories (PM2.5 source related) suggest that diel variation in Delta Hg-199 values resulted primarily from the photochemical reduction of divalent PM2.5-Hg, rather than variations in emission sources. The importance of photoreduction is supported by the strong correlations between Delta Hg-199 and (i) Delta Hg-201 (positive, slope = 1.1), (ii) delta Hg-202 (positive, slope = 1.15), (iii) content of Hg in PM2.5 (negative), (iv) sunshine durations (positive) and (v) ozone concentration (positive) observed for consecutive day-night paired samples. Our results provide isotopic evidence that local, daily photochemical reduction of divalent Hg is of critical importance to the fate of PM2.5-Hg in urban atmospheres and that, in addition to variation in sources, photochemical reduction appears to be an important process that affects both the particle mass-specific abundance and isotopic composition of PM2.5-Hg. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000455600000002 |
WOS关键词 | MASS-INDEPENDENT FRACTIONATION ; ATMOSPHERIC MERCURY ; DEPENDENT FRACTIONATION ; HG ; PRECIPITATION ; HG(II) ; SPECIATION ; REDUCTION ; VAPOR |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/30885 |
专题 | 地球科学 |
作者单位 | 1.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Guizhou, Peoples R China; 2.Chinese Acad Sci, State Key Lab Organ Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Guangdong, Peoples R China; 3.Tianjin Univ, Inst Surface Earth Syst Sci, Tianjin 300072, Peoples R China; 4.Rutgers State Univ, Dept Environm Sci, New Brunswick, NJ 08901 USA; 5.Chinese Acad Sci, State Key Lab Atmospher Boundary Layer Phys & Atm, Inst Atmospher Phys, Beijing 100029, Peoples R China; 6.Lab Hebei Inst Reg Geol & Mineral Resources Surve, Shijiazhuang 065000, Hebei, Peoples R China |
推荐引用方式 GB/T 7714 | Huang, Qiang,Chen, Jiubin,Huang, Weilin,et al. Diel variation in mercury stable isotope ratios records photoreduction of PM2.5-bound mercury[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2019,19(1):315-325. |
APA | Huang, Qiang.,Chen, Jiubin.,Huang, Weilin.,Reinfelder, John R..,Fu, Pingqing.,...&He, Li.(2019).Diel variation in mercury stable isotope ratios records photoreduction of PM2.5-bound mercury.ATMOSPHERIC CHEMISTRY AND PHYSICS,19(1),315-325. |
MLA | Huang, Qiang,et al."Diel variation in mercury stable isotope ratios records photoreduction of PM2.5-bound mercury".ATMOSPHERIC CHEMISTRY AND PHYSICS 19.1(2019):315-325. |
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