Placencia Juan A, Saavedra Fernán, Fernández Javier, Aguirre Carolina
Department of Environmental Chemistry, Faculty of Sciences, Universidad Católica de la Santísima Concepción, Concepción, Chile.
Centro de Investigación en Biodiversidad y Ambientes Sustentables (CIBAS), Universidad Católica de la Santísima Concepción, Concepción, Chile.
Bull Environ Contam Toxicol. 2018 Mar;100(3):384-388. doi: 10.1007/s00128-017-2251-y. Epub 2018 Jan 6.
Surface sediments from Reloncaví Fjord and the Chiloé inner sea in Chilean Patagonia were extracted and analyzed to estimate deltamethrin and diflubenzuron levels. These antiparasitary pesticides have been used for decades in the salmon industry. Relationships were determined between pesticide concentrations and organic carbon percent in sediments. Deltamethrin (0.39-1.05 µg g dw) was found at all sampling sites but diflubenzuron (0.06-0.09 µg g dw) at only five. Diflubenzuron levels were similar for sediments from other fjord areas. However, deltamethrin concentration was 2-3 fold higher than other studies on this area. The organic carbon percent was correlated positively and significantly with diflubenzuron, but not with deltamethrin. Our results suggest that the high deltamethrin concentrations in sediments are due to the increased use of pyrethroids around salmon farming areas. But, the diflubenzuron levels can be explained by degradation processes.
对智利巴塔哥尼亚地区雷隆卡维峡湾和奇洛埃内海的表层沉积物进行了提取和分析，以估算溴氰菊酯和除虫脲的含量。这些抗寄生虫农药已在鲑鱼养殖业中使用了数十年。确定了沉积物中农药浓度与有机碳百分比之间的关系。在所有采样点均检测到溴氰菊酯（0.39 - 1.05微克/克干重），但仅在五个采样点检测到除虫脲（0.06 - 0.09微克/克干重）。其他峡湾地区沉积物中的除虫脲含量相似。然而，该地区溴氰菊酯的浓度比其他研究高出2至3倍。有机碳百分比与除虫脲呈显著正相关，但与溴氰菊酯无关。我们的结果表明，沉积物中溴氰菊酯浓度较高是由于鲑鱼养殖区周围拟除虫菊酯的使用增加。但是，除虫脲的含量可以用降解过程来解释。
