Tecnológico Nacional de México/Instituto Tecnológico de Boca del Río, Laboratorio de Investigación en Recursos Acuáticos LIRA, Kilómetro 12, Carretera Veracruz-Córdoba, Boca del Río 94290, Mexico.
Int J Environ Res Public Health. 2020 Feb 4;17(3):969. doi: 10.3390/ijerph17030969.
The fluvial-lagoon-deltaic system of the Palizada River in Campeche is an ecosystem of socioeconomic and ecological importance. It is justifiable to carry out studies in this system due to its connection with another larger ecosystem called the Términos Lagoon. The objective of this investigation was to analyze the concentration of Pb and Cd in sediments of the fluvial-lagoon-deltaic system of the Palizada River and to determine, with this, the contamination index of these metals. Cd showed the highest concentration in sampling sites and climatic seasons with respect to Pb, with a maximum value of 53.9 ± 5.0, while the Pb concentration was 10.4 ± 0.2 μg∙g. The same tendency was present with pollution and geoaccumulation indexes; here, the Cd index stands out. The enrichment of heavy metals was identified through the accumulation of Cd and Pb; such a process was evaluated through the geoacumulation index (Igeo). The results of this indicated that the contamination of these elements is mainly of anthropogenic origin. This element represents an ecological toxic risk due to the chronic presence of heavy metals in a priority area for the conservation of aquatic and terrestrial biota such as the Palizada system, owing to its high toxicity even at low concentrations. Thus, it is important to evaluate its sublethal effects in the organisms that inhabit this system, which requires the implementation of integral monitoring.
帕利萨达河的河流-泻湖-三角洲系统是一个具有社会经济和生态重要性的生态系统。由于它与另一个更大的生态系统——特米诺斯泻湖相连，因此对其进行研究是合理的。本研究的目的是分析帕利萨达河河流-泻湖-三角洲系统沉积物中 Pb 和 Cd 的浓度，并以此确定这些金属的污染指数。与 Pb 相比，Cd 在采样点和气候季节的浓度最高，达到 53.9 ± 5.0，而 Pb 的浓度为 10.4 ± 0.2μg∙g。污染和地质累积指数也存在相同的趋势，其中 Cd 指数尤为突出。重金属的富集是通过 Cd 和 Pb 的积累来识别的；通过地质累积指数（Igeo）来评估这一过程。结果表明，这些元素的污染主要来自人为因素。由于重金属在帕利萨达系统等水生和陆地生物保护的优先地区长期存在，即使在低浓度下也具有高毒性，因此 Cd 代表了生态毒性风险。因此，评估其在栖息于该系统的生物体中的亚致死效应非常重要，这需要实施综合监测。
