Guangzhou Zhixin High School, Guangzhou 510105, China.
College of Life Science and Technology, Jinan University, Guangzhou 510632, China.
Mar Pollut Bull. 2023 Jul;192:115047. doi: 10.1016/j.marpolbul.2023.115047. Epub 2023 May 16.
Mercury (Hg) in coastal wetlands is of great concern due to its acute toxicity. We measured the total Hg content (THg) from a Pb-dated sediment core obtained from the Futian mangrove wetland in Shenzhen Bay, South China to explore the historical variation and possible sources. Our results extend the sediment THg record back to 1960 and reveal three distinct intervals. Interval I (1960-1974) has low and increasing THg values, averaging 83.0 μg/kg; Interval II (1975-1984) witnesses a remarkably increase, peaking in 1980 (261.6 μg/kg) then remaining elevated; Interval III (1985-2014) shows a steady reduction, averaging 118.4 μg/kg. The good correlation among THg, TOC, and Hg/TOC, and the downstream decrease in monitoring sediment THg consistently suggest that the bulk THg are mainly sourced from the Shenzhen River discharge. The different timing in industrial development attributes the elevated THg concentrations during 1975-1984 to Hong Kong industrial sewage pollution.
汞（Hg）在沿海湿地中受到高度关注，因为它具有急性毒性。我们从中国深圳湾福田红树林湿地获得的一个铅定年沉积物芯中测量了总汞含量（THg），以探讨其历史变化和可能的来源。我们的结果将沉积物 THg 记录延长至 1960 年，并揭示了三个不同的间隔。间隔 I（1960-1974 年）的 THg 值较低且呈上升趋势，平均值为 83.0μg/kg；间隔 II（1975-1984 年）见证了显著增加，在 1980 年达到峰值（261.6μg/kg），然后保持升高；间隔 III（1985-2014 年）显示出稳定下降，平均值为 118.4μg/kg。THg、TOC 和 Hg/TOC 之间的良好相关性，以及监测沉积物 THg 的下游减少，都表明大部分 THg 主要来自深圳河的排放。工业发展的不同时间导致 1975-1984 年期间 THg 浓度升高归因于香港工业污水污染。
