School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing, Jiangsu 210046, PR China; School of Resources and Environment, West Anhui University, Lu'an, Anhui 237012, PR China.
School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing, Jiangsu 210046, PR China.
Environ Pollut. 2016 Sep;216:332-339. doi: 10.1016/j.envpol.2016.05.083. Epub 2016 Jun 10.
Mercury (Hg) accumulation records spanning the last 16,000 years before present (yr BP, relative to AD 1950) were derived from a peat core collected from Dajiuhu mire, central China. The natural Hg concentration and accumulation rate (free from anthropogenic influence) were 135.5 ± 53.9 ng g(-1) and 6.5 ± 4.5 μg m(-2) yr(-1), respectively. The increase in Hg flux that started from a core depth of 96.5 cm (3358 cal yr BP) is independent of soil erosion and organic matter content. We attribute this to an increase in atmospheric Hg deposition derived from regional anthropogenic activities. Anthropogenic Hg accumulation rates (Hg-ARA) in the pre-industrial period peaked during the Ming and the early Qing dynasties (582-100 cal yr BP), with Hg-ARA of 9.9-24.6 and 10.7-24.4 μg m(-2) yr(-1), respectively. In the industrial interval (post∼1850 AD), Hg-ARA increased progressively and reached 32.7 μg m(-2) yr(-1) at the top of the core. Our results indicate the existence of regional atmospheric Hg pollution spanning the past ∼3400 years, and place recent Hg enrichment in central China in a broader historical context.
本研究从中国中部大鸡湖沼泽采集的泥炭芯中获得了过去 16000 年（相对于公元 1950 年）的汞（Hg）积累记录。自然 Hg 浓度和积累率（不受人为影响）分别为 135.5±53.9ng g-1和 6.5±4.5μg m-2 yr-1。从芯深 96.5cm（3358 cal yr BP）开始的 Hg 通量增加与土壤侵蚀和有机质含量无关。我们将其归因于区域人为活动导致的大气 Hg 沉积增加。在工业化之前的时期，人为 Hg 积累率（Hg-ARA）在明清时期（582-100 cal yr BP）达到峰值，Hg-ARA 分别为 9.9-24.6 和 10.7-24.4μg m-2 yr-1。在工业间隔（约 1850 年以后），Hg-ARA 逐渐增加，在芯的顶部达到 32.7μg m-2 yr-1。我们的研究结果表明，过去约 3400 年来存在区域性大气 Hg 污染，并且将中国中部地区近期的 Hg 富集置于更广泛的历史背景下。
