Universidad Autónoma de Guerrero, Departamento de Química, Avenida Lázaro Cárdenas s/n, ciudad universitaria, Chilpancingo 39660, Gro. México.
Ecotoxicol Environ Saf. 2010 Mar;73(3):287-95. doi: 10.1016/j.ecoenv.2009.10.006. Epub 2009 Nov 14.
An environmental study revealed that three metals (Al, Fe and Zn) are common in the San Pedro River (SPR) (Aguascalientes, Mexico). Regrettably, in many samples the concentrations of these metals exceeded the maximum allowed toxicant concentrations levels as defined in by Mexican legislation. The highest concentrations of the three metals were found during the 2005 dry season, with elevated Al concentrations present along the entire river. Not surprisingly, the highest concentrations for all three metals came from locations adjacent to industrial areas. Estimates of the contribution of these metals to total toxicity revealed that these three metals are important contaminants of the river and responsible for most of the lethal toxicity found in environmental samples. To assess the importance of these reports, we conducted acute toxicity tests to determine LC50 for Al, Fe and Zn on the freshwater rotifer Lecane quadridentata. This permitted us to estimate the contribution of these metals to total toxicity during 2005-2006. Based on LC50 values, all three metals should be considered very toxic, with the zinc LC50 value (0.12 mg L(-1)) making it the most toxic metal for L. quadridentata. This approach can be applied to other sites with similar concentrations of these metals.
一项环境研究表明，三种金属（铝、铁和锌）在圣佩德罗河（SPR）（墨西哥阿瓜斯卡连特斯州）很常见。遗憾的是，在许多样本中，这些金属的浓度超过了墨西哥法规定义的最大允许毒物浓度水平。这三种金属的最高浓度出现在 2005 年旱季，整条河都存在高浓度的铝。毫不奇怪，所有三种金属的最高浓度都来自于工业区附近的地方。这些金属对总毒性的贡献估计表明，这三种金属是河流的重要污染物，也是环境样本中发现的大多数致死毒性的主要原因。为了评估这些报告的重要性，我们进行了急性毒性测试，以确定淡水轮虫丽蝇四齿轮的 LC50 对铝、铁和锌的影响。这使我们能够估计 2005 年至 2006 年期间这些金属对总毒性的贡献。根据 LC50 值，所有三种金属都应被视为非常有毒，锌的 LC50 值（0.12mg/L）使其成为丽蝇四齿轮最有毒的金属。这种方法可以应用于具有类似浓度的这些金属的其他地点。
