National Research Tomsk Polytechnic University, Lenin Ave., 30, Tomsk, 634050, Russia; Amur State University, Ignatyevskoe highway, 21, Blagoveshchensk, Amur Region, 675027, Russia.
Institute of Monitoring of Climatic and Ecological Systems Siberian Branch of Russian Academy of Sciences, Akademichesky Ave., 10/3, Tomsk, 634055, Russia.
Chemosphere. 2022 Jan;287(Pt 3):132157. doi: 10.1016/j.chemosphere.2021.132157. Epub 2021 Sep 11.
The article provides original data on the ecological and geochemical characteristics of the distribution of Hg in the leaves and annual rings of balsam poplar (P. balsamifera L.) in the zone of influence of lithium production (Novosibirsk). In 2017 high Hg concentration (1300 ng/g) in the poplar leaves was recorded in the northeastern part of the city near the industrial facility of the lithium plant. The investigation showed a clear trend of increased Hg accumulation in the poplar leaves during the growing season. The maximum average Hg content was detected in the leaf litter in 2006 (1153-2425 ng/g). However, the average Hg content in the soil is 294 ng/g, which is significantly lower than the threshold limit value (2100 ng/g). Studies of changes in the content of Hg with the height of the crown of the tree revealed an increase in the upwind side of the emission source, the concentration of Hg in the leaves is on average 1.5 times higher than on the side of the "wind shadow". Hg in poplar leaves, leaf litter, and soils is mainly found in free and physically bonded forms - the most mobile, prone to increased migration, transformation and methylation under environmental conditions. According to the Hg content in the poplar cores, an increase in the Hg input near the source was established with the beginning of Li production - in the period 1967-1985 years (441 ng/g) with a subsequent decrease to 6 ng/g in 2000-2017.
本文提供了关于锂生产影响区（新西伯利亚）银叶杨（P. balsamifera L.）叶片和年轮中 Hg 分布的生态和地球化学特征的原始数据。2017 年，在城市东北部靠近锂厂工业设施的地方，记录到杨树叶片中 Hg 浓度很高（1300ng/g）。调查表明，杨树叶片中 Hg 的积累在生长季节有明显增加的趋势。2006 年，落叶中的平均 Hg 含量最高（1153-2425ng/g）。然而，土壤中的平均 Hg 含量为 294ng/g，明显低于阈值限值（2100ng/g）。对树冠高度与 Hg 含量变化的研究表明，在排放源的上风侧，Hg 的浓度平均比“风影”侧高 1.5 倍。杨树叶片、落叶和土壤中的 Hg 主要以游离态和物理结合态存在——最具迁移性，在环境条件下容易增加迁移、转化和甲基化。根据杨树芯中的 Hg 含量，在 Li 生产开始时，在源附近建立了 Hg 输入的增加——在 1967-1985 年期间（441ng/g），随后在 2000-2017 年期间减少到 6ng/g。
