Cheng Liu, Ma Bing-Juan, Zhou Wei-Li, Wang Li, Zhi Yin, Liu Qing-Wei, Mao Yu-Xiang
Institute of Resources & Environment, Henan Polytechnic University, Jiaozuo 454003, China.
Lomon Billions Group Co., Ltd., Jiaozuo 454003, China.
Huan Jing Ke Xue. 2017 Dec 8;38(12):5032-5038. doi: 10.13227/j.hjkx.201705227.
In order to obtain the distribution of different species of mercury (Hg) in the water in the Sanmenxia Reservoir, cold vapor atomic fluorescence spectrometry (CVAFS) and aqueous phase ethylation derivatization-gas chromatography-atomic fluorescence spectrometry (GC-CVAFS) methods were used for the analysis of total Hg (THg) and methylmercury (MeHg) in water and sediment samples, respectively. It was found that the levels of THg, dissolved mercury, and particulate mercury in the water ranged from 1.65-9.65, 0.80-3.16, and 0.70-7.81 ng·L, respectively. The THg in the water could meet the requirement for the Class I criterion in the national surface water environmental quality standard (GB 3838-2002). The amounts of MeHg, dissolved MeHg, and particulate MeHg in the water samples were 0.05-0.36, 0.02-0.14, and ND-0.26 ng·L, respectively. No evident seasonal or spatial patterns for Hg were observed. The THg and MeHg in the Sanmenxia Reservoir were within the ranges for those in uncontaminated waterbodies worldwide. The amount of THg in the sediments was (92.96±10.65) ng·g and (80.06±19.14) ng·g, while the amount of MeHg in the corresponding sediment samples was (0.33±0.14) ng·g and (0.50±0.19) ng·g for wet and dry seasons, respectively. The ratios of MeHg/THg in the sediment of the Sanmenxia Reservoir were relatively small in comparison to those in other aqueous systems, indicating that methylation might play a minor role in the biogeochemistry of Hg in the Sanmenxia Reservoir. This might be attributed to the high dissolved oxygen levels of the bottom water and low organic carbon content of the sediments.
为获取三门峡水库水体中不同汞（Hg）形态的分布情况，分别采用冷原子荧光光谱法（CVAFS）和水相乙基化衍生-气相色谱-原子荧光光谱法（GC-CVAFS）对水体和沉积物样品中的总汞（THg）和甲基汞（MeHg）进行分析。结果表明，水体中THg、溶解态汞和颗粒态汞的含量分别为1.65 - 9.65、0.80 - 3.16和0.70 - 7.81 ng·L。水体中的THg符合国家地表水环境质量标准（GB 3838 - 2002）中Ⅰ类标准的要求。水样中MeHg、溶解态MeHg和颗粒态MeHg的含量分别为0.05 - 0.36、0.02 - 0.14和ND - 0.26 ng·L。未观察到Hg明显的季节或空间分布规律。三门峡水库中的THg和MeHg含量处于全球未受污染水体的范围内。沉积物中THg的含量在湿季和干季分别为(92.96±10.65) ng·g和(80.06±19.14) ng·g，而相应沉积物样品中MeHg的含量在湿季和干季分别为(0.33±0.14) ng·g和(0.50±0.19) ng·g。与其他水体系统相比，三门峡水库沉积物中MeHg/THg的比值相对较小，这表明甲基化作用在三门峡水库汞的生物地球化学过程中可能作用较小。这可能归因于底层水体的高溶解氧水平和沉积物的低有机碳含量。
