Abstract：
The Ba River in Vietnam has been facing pollution due to waste generation from agricultural and urban areas. This study focuses on evaluating the spatiotemporal variations in river water quality based on physicochemical characteristics and pesticide parameters for different seasons in 2022-2023. The results indicate that the concentrations of most parameters in the rainy season were higher than those in the early-dry and dry seasons due to the non-point sources in agricultural areas. Notably, the analysis of pesticide residue in both the rainy and dry seasons revealed low levels of chlorpyrifos (ethyl), and deltamethrin was detected in the only rainy season. The results from the hierarchical cluster analysis and water quality index show that the water quality at Ben Mong, An Khe, and Ba River Bridges was classified as moderately to highly polluted. These areas should focus on regular water quality monitoring and appropriate pollution source management. PRACTITIONER POINTS: Agriculture activities strongly affected the water quality of the Highland Ba River of Vietnam. Chlorpyrifos and deltamethrin pesticides (0.0074-0.0218 μg/L) were detected in Ba River. Non-point pollution sources significantly influenced water quality in the Ba River. Variations in river water quality mainly depend on seasons and locations. Water quality index values in rainy seasons (26-88) are lower than that in dry season (37-92).
摘要：
由于农业和城市地区产生的废物，越南的巴河一直面临污染。本研究基于2022-2023年不同季节的理化特性和农药参数，重点评估河流水质的时空变化。结果表明，由于农业地区的非点源，雨季大多数参数的浓度高于干旱和干旱早期。值得注意的是,对雨季和旱季农药残留的分析显示，毒死蜱(乙基)含量较低，溴氰菊酯在唯一的雨季被检测到。层次聚类分析和水质指数的结果表明,AnKhe,巴河桥梁被归类为中度至高度污染。这些领域应侧重于定期水质监测和适当的污染源管理。实践要点：农业活动强烈影响了越南高地巴河的水质。在Ba河中检测到毒死蜱和溴氰菊酯农药（0.0074-0.0218μg/L）。非点源污染对巴河水质有显著影响。河流水质的变化主要取决于季节和位置。雨季水质指数值(26-88)低于旱季(37-92)。
