Department of Water Resources, Federal University of Lavras (UFLA), Lavras, Minas Gerais State, Brazil.
, Lavras, Minas Gerais State, Brazil.
Environ Monit Assess. 2022 Feb 24;194(3):222. doi: 10.1007/s10661-022-09885-x.
Anthropic activities performed in a river basin, especially those that promote changes in the soil surface, have great effect on the quality of the waters in the basin. Thus, the objective of this study was to evaluate water quality by applying the Water Quality Index (WQI) in springs and watercourses located in an area with different land use and occupation characteristics, as well as to compare the analyzed variables with the standards established for class 2 of the National Environmental Council (CONAMA, for its acronym in Portuguese) Resolution No. 357/2005. Seven sampling points located in the rural area of the municipality of Jacutinga, Minas Gerais State (MG), were monitored. The water samples were collected from October 2018 to July 2019. Comparison with the resolution showed that the quality condition was lower than the standard established for class 2 in most campaigns conducted. Regarding the mean WQI, the water quality at points S1, WC1, WC2, and WC3 was classified as "average," while the water quality at points S2, S3, and S4 was classified as "good." There was seasonal variation in the WQI only at point WC1. Overall, thermotolerant coliforms (TC), nitrate, and phosphorus are the main factors deteriorating water quality, and it may be directly related to the agricultural activities practiced in the monitored areas.
人类在流域内开展的各种活动，特别是那些改变土壤表面的活动，对流域内的水质有很大影响。因此，本研究的目的是通过应用水质指数（WQI）来评估泉水和溪流的水质，这些泉水和溪流位于具有不同土地利用和占用特征的区域，并将分析的变量与国家环境委员会（CONAMA）第 357/2005 号决议规定的 2 类标准进行比较。在米纳斯吉拉斯州 Jacutinga 市的农村地区监测了七个位于 7 个采样点。水样于 2018 年 10 月至 2019 年 7 月采集。与决议的比较表明，在大多数情况下，水质状况低于第 2 类标准。关于平均 WQI，S1、WC1、WC2 和 WC3 点的水质被归类为“平均”，而 S2、S3 和 S4 点的水质被归类为“良好”。仅在 WC1 点存在季节性变化。总的来说，耐热大肠菌群（TC）、硝酸盐和磷是恶化水质的主要因素，这可能与监测区域内进行的农业活动直接相关。
