Programa de Pós-Graduação em Ciências Ambientais (PPGCA/UNIFAP), Universidade Federal Do Amapá, Rod. Juscelino Kubitschek, Km 02 - Jardim Marco Zero, 68903-419, Macapá, AP, Brazil; Laboratório de Ictio e Genotoxidade, Universidade Federal do Amapá (UNIFAP), Rod. Juscelino Kubitschek, Km 02 - Jardim Marco Zero, 68903-419, Macapá, AP, Brazil.
Programa de Pós-Graduação em Ciência e Tecnologia Ambiental (CTA) Universidade Federal da Grande Dourados (UFGD), Rod. Dourados Itahum Km 12, Dourados, MS, Caixa, Postal: 79804-970, Brazil.
Environ Res. 2022 May 15;208:112691. doi: 10.1016/j.envres.2022.112691. Epub 2022 Jan 10.
Amazonian aquatic environments are seriously impacted by dam-building and deforestation, among other threats. Therefore, the present study aimed to examine water quality in the middle and lower course of the Araguari River with respect to the composition of vegetative cover and the concentration of As, Cd and Hg in order to determine risks to the preservation of biota and risks to human health from consumption of P. squamosissimus contaminated with these inorganic elements. To accomplish this, water samples and fish specimens were collected in the middle and lower Araguari River in 2019. The concentration of inorganic contaminants was analyzed by atomic absorption spectrophotometry. These stretches of the Araguari River presented higher proportions of forest fragments and evident expansion of buffalo pastures. According to Brazilian legislation, the concentrations of Cd and Hg in the water samples represented risk quotient values > 1, indicating risk to the preservation of aquatic biota. In particular, the concentrations of Cd in the muscle tissue of P. squamosissimus in the lower Araguari River also indicated risks to human health. The bioaccumulation factor indicated that Hg is bioavailable in the water. It can be concluded that water imbalances in the middle and lower Araguari River compromise the health of both aquatic and human life.
亚马逊水域环境受到筑坝和森林砍伐等威胁的严重影响。因此，本研究旨在检测阿拉瓜里河中下游的水质，包括植被覆盖组成和 As、Cd 和 Hg 的浓度，以确定对生物多样性保护的风险以及食用受这些无机元素污染的 P. squamosissimus 对人类健康的风险。为此，于 2019 年在阿拉瓜里河中下游采集了水样和鱼类标本。采用原子吸收分光光度法分析无机污染物的浓度。这些阿拉瓜里河段的森林片段比例较高，水牛牧场明显扩张。根据巴西法规，水样中 Cd 和 Hg 的浓度代表风险商数值>1，表明对水生生物多样性的保护存在风险。特别是在阿拉瓜里河下游的 P. squamosissimus 肌肉组织中 Cd 的浓度也表明对人类健康存在风险。生物积累因子表明 Hg 在水中具有生物可利用性。可以得出结论，阿拉瓜里河中下游的水失衡危及水生和人类的健康。
