垃圾焚烧厂周边土壤中总汞和甲基汞分布特征研究

Characteristic analysis of the total mercury and methylmercury distribution in the soils around a municipal solid waste incineration plant

以广州李坑垃圾焚烧厂为研究对象,研究该厂周边土壤中总汞及甲基汞分布特征,并探讨两者质量比分布相关性。结果表明：垃圾焚烧厂周边土壤中总汞质量比为56.0-103.2 ng/g,平均值为78.92ng/g,高于广州市白云区土壤中总汞平均质量比72.0 ng/g;甲基汞的质量比为0.146-0.978 ng/g,平均值为0.630 ng/g;垃圾焚烧厂周边土壤中甲基汞质量比占总汞质量比的0.25%-0.97%,两者质量比相关系数为0.807。

To disclose the relationship between the distribution of total mercury content and that of methylmercury in the soil, we chosen the soils at 7 sites around Likeng solid waste incineration plant （SWIP）, Guagnzhou, as a ease study sample. We have managed to detect the total mercury content with the atomic fluorescence spectro- metric method via an atomic fluorescence spectrometer, whereas to detect the content of the methylmercury by using Methyhnercury auto- matic analyzer （MERXTM） for the GC - CVAFS after aqueous phase ethylation. And, then, we have investigated the relationship between the distributions of total mercury content and that of methylmercury with Origin. The results of our investigation shows that the content of total mercury in the soil around Likeng SIWP is 56.0 103.2 ng/g, with its average content being 78.92 ng/g, which is slightly higher than that at its Baiyun counterpart in Guangzhou （72.0 ng/g）. This proves that the accumulation of the total mercury in the soil is not sig nificant, whereas that of methylmercury is 0.146 - 978 ng/g, with its average content being 0.630 ng/g. What is more, the mercury depo sition in flue gas from MSW incineration, which serves as a key indi cator affected by the meteorological condition and topographic condi tion, is the main reason that leads the mercury content in the soil in crease. However, the soil constitutes one of the important environ- ment factors for methylation of mercury, as well as one of key factors accounts for the total mercury to be converted into the methylmercury under some conditions. Thus, our research suggests that the content of methylmercury in the soil surrounding SWIP accounts for about 0.25 %-0.97 % of the total mercury in it. Thus, a thorough retro-spective analysis helps us to reveal the statistical relationship between total mercury content （ y ） and methyhnercury content （ x ）, which stands as： y = 51.074x ＋ 51.757, with the coefficient of correlation between y and x is 0.807, indicating that they are obviously corre lated.