Centro de Ciências da Saúde, Universidade da Região da Campanha, Bagé, Rio Grande do Sul, Brazil.
Arch Environ Contam Toxicol. 2013 Oct;65(3):434-41. doi: 10.1007/s00244-013-9918-0. Epub 2013 Jun 4.
During coal combustion, hazardous elements are discharged that impair environmental quality. Plant cover is the first available surface for the atmospheric pollutants in terrestrial ecosystems. The aim of this study was to evaluate genotoxicity in the aqueous extract of the native plant, Baccharis trimera, exposed to coal and emissions from a thermal power plant (coal-fired power plant in Candiota, Brazil), correlating seasonality, wind tunnel predominance, and presence of inorganic elements. The presence of inorganic elements in the aerial parts of B. trimera was analyzed by particle-induced X-ray emission (PIXE) spectrometry, and genotoxicity was evaluated by ex vivo comet assay. The genotoxic effects of aqueous extracts of B. trimera from four sites located in the area around power plant were analyzed by comet assay in peripheral human lymphocytes. Winter samples showed greater levels of metals than summer samples. Genotoxicity was detected in B. trimera extracts collected from the region exposed to extraction and burning coal. Extracts from the site impacted by the dominant wind induced more damage to DNA than those from other sites. Based on our data, we can suggest that in winter the inorganic elements from extraction and burning of coal and carried through the wind tunnel were responsible for the genotoxicity observed in aqueous extract of B. trimera.
在煤炭燃烧过程中，会排放出有害元素，从而损害环境质量。植物覆盖物是陆地生态系统中大气污染物到达的第一个表面。本研究的目的是评估暴露于煤和火力发电厂（巴西坎迪奥塔的燃煤电厂）排放物的本地植物 Baccharis trimera 的水提物的遗传毒性，同时关联季节性、风洞优势和无机元素的存在。使用粒子诱导 X 射线发射（PIXE）光谱法分析了 Baccharis trimera 空中部分的无机元素的存在情况，并通过体外彗星试验评估了遗传毒性。通过彗星试验分析了来自电厂周围四个地点的 Baccharis trimera 水提取物的遗传毒性。冬季样本中的金属含量高于夏季样本。从暴露于提取和燃烧煤炭的区域采集的 Baccharis trimera 提取物中检测到遗传毒性。受主导风向影响的地点的提取物对 DNA 的损伤大于其他地点的提取物。根据我们的数据，我们可以推测在冬季，来自煤炭提取和燃烧以及通过风洞携带的无机元素是导致 Baccharis trimera 水提取物遗传毒性的原因。
