Huang Shuyuan, Lin Kunning, Yuan Dongxing, Gao Yaqin, Sun Lumin
State Key Laboratory of Marine Environmental Science, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China.
State Key Laboratory of Marine Environmental Science, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China.
Mar Pollut Bull. 2016 Dec 15;113(1-2):81-86. doi: 10.1016/j.marpolbul.2016.08.057. Epub 2016 Sep 7.
Samples of dissolved gaseous mercury (DGM) in the post-desulfurized seawater discharged from a coal-fired power plant together with samples of gaseous elemental mercury (GEM) over the post-desulfurized seawater surface were collected and analyzed to study the mercury isotope fractionation during transfer from post-desulfurized seawater to air. Experimental results showed that when DGM in the seawater was converted to GEM in the air, the δHg and ΔHg values were changed, ranging from -2.98 to -0.04‰ and from -0.31 to 0.64‰, respectively. Aeration played a key role in accelerating the transformation of DGM to GEM, and resulted in light mercury isotopes being more likely to be enriched in the GEM. The ratio ΔHg/ΔHg was 1.626 in all samples, suggesting that mercury mass independent fractionation occurred owing to the nuclear volume effect during the transformation. In addition, mass independent fractionation of mercury even isotopes was found in the GEM above the post-desulfurized seawater surface in the aeration pool.
采集并分析了某燃煤电厂脱硫后排放海水中的溶解态气态汞（DGM）样本以及脱硫后海水表面上方的气态单质汞（GEM）样本，以研究汞从脱硫后海水转移至空气中的同位素分馏情况。实验结果表明，当海水中的DGM在空气中转化为GEM时，δHg和ΔHg值发生了变化，范围分别为-2.98至-0.04‰和-0.31至0.64‰。曝气在加速DGM向GEM的转化过程中起关键作用，导致轻汞同位素更易在GEM中富集。所有样本的ΔHg/ΔHg比值为1.626，表明在转化过程中由于核体积效应发生了汞的质量无关分馏。此外，在曝气池中脱硫后海水表面上方的GEM中发现了汞偶同位素的质量无关分馏。
