黄海-西北太平洋表层海水Hg的形态研究

Mercury species in surface water from Yellow Sea to Northwest Pacific Ocean

于2015年3月29日至5月6日乘东方红2号从青岛前往西北太平洋,采用现场测定与室内分析结合的方法分析了黄海到西北太平海域表层海水中Hg形态及分布特征,以认识黄海到西北太平洋海水Hg的含量及区域Hg的迁移。黄海-西北太平洋表层海水中总汞(THg,total mercury)变化范围为0.11~2.50 ng/L,平均为0.75±0.51 ng/L,THg的含量呈近海高大洋低;表层海水中活性汞(RHg,reactive mercury)范围为0.10~1.45 ng/L,平均为0.33±0.24 ng/L,RHg/THg平均为48.4%,海水中RHg与水温呈显著性正相关(r=0.494*,P=0.045);表层海水中溶解性气态汞(DGM,dissolved gaseous mercury)的含量为11.7~105.7 pg/L,平均浓度39.6±22.9 pg/L。海水中DGM与气温呈显著正相关(r=0.633*,P=0.011),与风速呈显著负相关关系(r=-0.660**,P=0.006)。从黄海到西北太平洋DGM含量逐渐升高,其日变化呈现白天高夜晚低的趋势,主要受光照的影响。

From March 29,2015 to May 6,seawater samples were collected from Qingdao to Northwest Pacific Ocean on Dongfanghong 2. Mercury species were determined using the method of in-situ and indoor to study their distribution characteristics. This research will be helpful to understand the concentration of mercury from Yellow Sea to Northwest Pacific Ocean and the migration of mercury in areas. The total mercury（ THg） concentration from Yellow Sea to Northwest Pacific Ocean varied from 0. 11 ng/L to 2. 50 ng/L,with the average of 0. 75 ± 0. 51 ng/L. THg concentration was high in marginal sea of China and low in ocean. The reactive mercury（ RHg） concentration varied from 0. 10 ng/L to 1. 45 ng/L with the average of 0. 33 ± 0. 24 ng/L,and the RHg/THg varied from 15. 4% to 88. 6% with the average of 48. 4%. RHg concentration had a positive correlation with water temperature（ r = 0. 494 ＊,P = 0. 045）. The concentration of dissolved gaseous mercury（ DGM） varied from 11. 7 pg/L to 105. 7 pg/L with the average of 39. 6 ±22. 9 pg/L. DGM concentration had a positive correlation with temperature（ r = 0. 633 ＊,P = 0. 011） and negative correlation with wind speed（ r =-0. 660＊＊,P = 0. 006）. DGM concentration increased from Yellow Sea to Northwest Pacific Ocean. Affected by illumination intensity,the measurements showed a noticeable diurnal of DGM with high concentration during daytime and low concentration during nighttime.