Grondona Sebastián Iván, Gonzalez Mariana, Martínez Daniel Emilio, Massone Héctor Enrique, Miglioranza Karina Silvia Beatriz
Instituto de Geología de Costas y del Cuaternario, Universidad Nacional de Mar del Plata- Comisión de Investigaciones Científicas, Buenos Aires, Argentina.
Grupo de Ecotoxicología y Contaminación Ambiental, Universidad Nacional de Mar del Plata, Buenos Aires, Argentina.
Bull Environ Contam Toxicol. 2019 Apr;102(4):544-549. doi: 10.1007/s00128-019-02584-3. Epub 2019 Mar 9.
This work evaluates the factors affecting the presence of organochlorine pesticides in Pampeano aquifer in the Quequén Grande River watershed, Buenos Aires Province, Argentina. Eighteen sampling sites were selected in order to have representatives of different type of wells and types of soil. Among the analyzed compounds, endosulfan showed the highest concentrations (4.75 ng l mean), which could be related to use in the recent past. Others important pesticides groups detected were HCHs (1.1 ng l mean) and heptachlors (2.17 ng lmean). The analysis of the results show that the thickness of the unsaturated zone is the main factor related to the concentrations of pesticides and there were no differences according to wells or soil types. Although agricultural use of most OCPs has been banned in Argentina from more than 30 years ago, their residues are still detected in groundwater of the region, indicating their high persistence.
本研究评估了影响阿根廷布宜诺斯艾利斯省克肯格兰德河流域潘佩亚诺含水层中有机氯农药存在的因素。为了涵盖不同类型的水井和土壤类型，选取了18个采样点。在所分析的化合物中，硫丹的浓度最高（平均4.75纳克/升），这可能与近期的使用有关。检测到的其他重要农药类别包括六氯环己烷（平均1.1纳克/升）和七氯（平均2.17纳克/升）。结果分析表明，非饱和带的厚度是与农药浓度相关的主要因素，且根据水井或土壤类型并无差异。尽管阿根廷在30多年前就已禁止大多数有机氯农药的农业使用，但该地区的地下水中仍能检测到它们的残留，这表明它们具有很高的持久性。
