College of Forestry, Nanjing Forestry University, 159 Longpan Road, Nanjing, 210037, Jiangsu, China; School of Geography and Ocean Science, Nanjing University, 163 Xianlin Road, Nanjing, 210023, Jiangsu, China.
College of Forestry, Nanjing Forestry University, 159 Longpan Road, Nanjing, 210037, Jiangsu, China.
Environ Pollut. 2019 Jun;249:573-580. doi: 10.1016/j.envpol.2019.03.055. Epub 2019 Mar 25.
The adsorption of polycyclic aromatic hydrocarbons (PAHs) by components such as elemental carbon (EC), total organic carbon (TOC), and particles is different, and EC and PAHs are good materials for reconstructing historical human activity patterns and pollution conditions. In this study, the effects of EC (soot and char), TOC and particles of different grain size on PAHs in surface sediments were quantitatively analysed, and their historical concentrations in a sediment core from western Taihu Lake were reconstructed. The contents of soot, TOC, clay, EC and char explained 57.2%, 27.6%, 26.0%, 24.0% and 16.4%, respectively, of the PAH concentrations in surface sediments. The correlation between the soot and PAH levels was significantly higher than that between the char, TOC, and clay contents and PAH levels, and PAHs were mainly affected by the local economic development and human activity, as indicated by metrics of population, highway mileage, coal burning, and industrial output. With the development of the economy of the Taihu Lake Basin, the composition of PAHs in the sediments has changed: the proportion of low-molecular-weight PAHs decreased from 42.4% to 17.5%, and that of high-molecular-weight PAHs increased from 58.7% to 82.5%. The concentration of PAHs in pore water from Taihu Lake over the past 100 years was reconstructed and ranged from 43.1 to 961.2 μg L, with an average of 180.7 μg L. After China's reform and opening up, the concentrations of various PAHs in Taihu Lake changed from safe to chronic pollution levels. The ratios of lead (Pb) isotopes and the diagnostic ratios of PAHs showed that the main sources of PAHs in western Taihu Lake sediments were human activities such as coal and petroleum combustion.
多环芳烃 (PAHs) 被元素碳 (EC)、总有机碳 (TOC) 和颗粒等成分吸附的情况不同，EC 和 PAHs 是重建人类历史活动模式和污染状况的良好材料。本研究定量分析了不同粒径的 EC（烟尘和炭黑）、TOC 和颗粒对表层沉积物中 PAHs 的影响，并重建了太湖西部沉积物岩芯中 PAHs 的历史浓度。烟尘、TOC、粘土、EC 和炭黑的含量分别解释了表层沉积物中 PAHs 浓度的 57.2%、27.6%、26.0%、24.0%和 16.4%。烟尘与 PAH 水平之间的相关性明显高于炭黑、TOC 和粘土含量与 PAH 水平之间的相关性，表明 PAHs 主要受当地经济发展和人类活动的影响，这一点可以通过人口、公路里程、煤炭燃烧和工业产出等指标来衡量。随着太湖流域经济的发展，沉积物中 PAHs 的组成发生了变化：低分子量 PAHs 的比例从 42.4%下降到 17.5%，高分子量 PAHs 的比例从 58.7%上升到 82.5%。重建了过去 100 年来太湖湖水中 PAHs 的浓度，范围为 43.1 至 961.2μg/L，平均值为 180.7μg/L。中国改革开放后，太湖湖水中各种 PAHs 的浓度从安全水平变为慢性污染水平。铅 (Pb) 同位素比值和 PAHs 的诊断比值表明，太湖西部沉积物中 PAHs 的主要来源是煤炭和石油燃烧等人为活动。
