半干旱地区水生环境中痕量金属的人为污染是研究的关键领域。这项研究的目的是研究罗萨里奥水库表层沉积物中痕量金属的浓度和空间分布,受到Tilaápia-do-Nilo(Oreochromisniloticus)的集约化水产养殖的影响。收集了三个不同区域的沉积物样本,后文化(PCTV),2019年旱季种植(CTV)和控制(CTRL)。粒度组成,有机质和铁的浓度,Mn,Zn,Cu,Cr,Cd,测定了Pb和Ni金属。使用多变量统计。使用了地球化学和生态毒理学指标,并与沉积物质量指南(SQG)进行了比较。沉积物的特征是粉质粘土壤土,平均有机质为18.76±4.27。分析优值数字显示了89%至99%的准确性(认证标准中的金属回收率)和高精度(RSD<5%)。金属的浓度范围为:0.11-0.85(%),Mn:14.46-86.91,Zn:2.6-220.56,Cu:26.89-98.75,Cr:60.18-76.06,Cd:0.38-0.59,Pb:18.13-43.13和Ni:34.4-46.75,全部在(mg/kg-1)中。最高浓度值出现在CTV区域(Fe:40±0.22,Mn:66.48±19.11,Zn:114.83±59.75和Cr:70.85±2.62)和PCTV(Cd:0.53±0.04,Cu:71.83±21.20,Pb:33.71±4.34和Ni:44.60±1.79)。皮尔森的相关性,层次聚类分析和主成分分析证实了鱼类养殖对金属的影响。只有Ni的浓度值高于SQG中建立的参考值。因此,考虑到可能的地球化学和生态毒理效应,它们包括两个最低的影响水平。
Anthropogenic pollution by trace metals in aquatic environments in semiarid zones is a critical area of investigation. The objective of this study was to investigate the concentration and spatial distribution of trace metals in surface sediments in the Rosário reservoir, which is affected by the intensive aquaculture of Tilápia-do-Nilo (
Oreochromis niloticus). Sediment samples were collected in three different areas, postculture (PCTV), cultivation (CTV) and control (CTRL) in the dry season in 2019. The granulometric composition, organic matter and concentrations of Fe, Mn, Zn, Cu, Cr, Cd, Pb and Ni metals were determined. Multivariate statistics were used. Geochemical and ecotoxicological indices and a comparison with sediment quality guidelines (SQG) were used. The sediment was characterized by silty clay loam with an average organic matter of 18.76 ± 4.27. The analytical merit figures demonstrated accuracy (metal recoveries in certified standards) between 89 to 99% and high precision (RSD < 5%). The concentration ranges for the metals were Fe: 0.11-0.85 (%), Mn: 14.46-86.91, Zn: 2.6-220.56, Cu: 26.89-98.75, Cr: 60.18-76.06, Cd: 0.38-0.59, Pb: 18.13-43.13, and Ni: 34.4-46.75, all in (mg/kg-1). The highest concentration values were found in the CTV areas (Fe: 40 ± 0.22, Mn: 66.48 ± 19.11, Zn: 114.83 ± 59.75 and Cr: 70.85 ± 2.62) and PCTV (Cd: 0.53 ± 0.04, Cu: 71.83 ± 21.20, Pb: 33.71 ± 4.34 and Ni: 44.60 ± 1.79). Pearson\'s correlation, hierarchical cluster analysis and principal component analysis confirmed the influence of fish farming on metals. Only Ni presented concentration values higher than the reference value established in the SQG. Thus, considering the probable geochemical and ecotoxicological effects, they comprise the two lowest levels of impact.