Department of Civil and Environmental Engineering, Syracuse University, Syracuse, NY 13244, USA.
Department of Chemistry, College of Environmental Science and Forestry, State University of New York, Syracuse, NY 13210, USA.
Sensors (Basel). 2020 Jan 10;20(2):387. doi: 10.3390/s20020387.
In order to obtain a better perspective of the impacts of brownfields on the land-atmosphere exchange of mercury in urban areas, total gaseous mercury (TGM) was measured at two heights (1.8 m and 42.7 m) prior to 2011-2012 and after 2015-2016 for the remediation of a brownfield and installation of a parking lot adjacent to the Syracuse Center of Excellence in Syracuse, NY, USA. Prior to brownfield remediation, the annual average TGM concentrations were 1.6 ± 0.6 and 1.4 ± 0.4 ng · m - 3 at the ground and upper heights, respectively. After brownfield remediation, the annual average TGM concentrations decreased by 32% and 22% at the ground and the upper height, respectively. Mercury soil flux measurements during summer after remediation showed net TGM deposition of 1.7 ng · m - 2 · day - 1 suggesting that the site transitioned from a mercury source to a net mercury sink. Measurements from the Atmospheric Mercury Network (AMNet) indicate that there was no regional decrease in TGM concentrations during the study period. This study demonstrates that evasion from mercury-contaminated soil significantly increased local TGM concentrations, which was subsequently mitigated after soil restoration. Considering the large number of brownfields, they may be an important source of mercury emissions source to local urban ecosystems and warrant future study at additional locations.
为了更好地了解棕地对城市地区汞的地气交换的影响，在美国纽约州锡拉丘兹的锡拉丘兹卓越中心，在 2011-2012 年之前和 2015-2016 年之后，对一个棕地的修复和毗邻停车场的两个高度（1.8 米和 42.7 米）进行了总气态汞（TGM）测量。在棕地修复之前，地面和较高高度的 TGM 年平均浓度分别为 1.6±0.6 和 1.4±0.4ng·m - 3。棕地修复后，地面和较高高度的 TGM 年平均浓度分别下降了 32%和 22%。修复后夏季的汞土壤通量测量显示，净 TGM 沉积为 1.7ng·m - 2·day - 1，表明该地点已从汞源转变为净汞汇。大气汞网络（AMNet）的测量结果表明，在研究期间，TGM 浓度没有区域性下降。本研究表明，受汞污染土壤的逸出显著增加了当地的 TGM 浓度，随后在土壤修复后得到缓解。考虑到大量的棕地，它们可能是当地城市生态系统汞排放的重要来源，值得在其他地点进一步研究。
