Abstract：Mercury (Hg) and arsenic (As) contents were determined in surface sediment collected at 6—13 sampling sites from Daya Bay in 2009, 2012, 2015 and 2018 according to the analysis methods in the “Ocean Monitoring Specification” (GB 17378.5—2007) to evaluate the distribution characteristics and pollution situation in Daya Bay. The pollution level was assessed based on potential ecological risk. The results indicated that the concentrations of Hg was 0.005—0.070 mg/kg, 0.005—0.071 mg/kg, 0.070—0.160 mg/kg, 0.008—0.064 mg/kg, and the average concentrations of Hg was 0.04, 0.04, 0.12, 0.04 mg/kg. The concentrations of As was 4.56—10.90 mg/kg, 1.50—8.80 mg/kg, 4.52—8.06 mg/kg, 5.65—9.90 mg/kg, and the average concentrations of As was 7.98, 4.81, 6.78, 7.35 mg/kg. The contents of Hg and As were changed gently, all within the standards of first class of Marine Sediment Quality (GB 18668—2002). The contents of Hg and As were distributed roughly the same, showing a decreasing trend from the top of the bay to bay mouth. The main source of Hg was derived from the sewage discharges in the coastal areas and the combustion of fossil fuels by industrial enterprises. The main source of As was related to agricultural pollution. The potential ecological risk showed that Hg presented strong potential ecological risk and As presented slight potential ecological risk. In the past ten years, Hg pollution in Daya Bay sediments has not been alleviated and more sufficient attention should be paid to Hg pollution in sediments.
杨文超, 黄道建, 陈继鑫, 陈晓燕, 王宇珊. 大亚湾近十年沉积物中汞、砷分布及污染评价[J]. 水产科学, 2020, 39(6): 915-921.
YANG Wenchao, HUANG Daojian, CHEN Jixin, CHEN Xiaoyan, WANG Yushan. Distribution and Pollution Assessment of Hg and As Contents in Surface Sediments of Daya Bay in the Past Ten Years. 水产科学, 2020, 39(6): 915-921.
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2020, Vol. 39 
