The seasonal and spatial changes in the chemical composition of the water in abandoned mine drainages and rivers in Yudong River area in the years of 2017–2018 were analyzed. The effects of mine water drainage on the seasonality and physicochemical properties of the river water after mine closure were evaluated, and the feasibility of irrigation using river water and the degree of pollution to farmland were assessed using the Water Quality Standard for Farmland Irrigation. The results show that the mine water has low pH value (< 3.5–4) and high levels of total hardness, SO₄²⁻, Fe, Al, and Zn. In addition, the pH of the mine water is negatively correlated with the presence of other metal ions. The correlation coefficient between the chemical oxygen demand (COD) and Fe reached 0.989. While the pollution levels of Pinglu and Baishui rivers were low, the confluence region of the two rivers was seriously polluted. However, only the levels of Fe and Cd slightly exceeded the Surface Water Environmental Quality Standard after the confluence of Yudong and Chongan rivers. Overall, the heavy pollution type of the confluent river is consistent with mine water pollution. The water quality is slightly better in the dry season compared than in the high-water period. Sulfate and Fe content decreased by 39 and 16 mg/L, respectively, and Cd content decreased two-fold. Despite these findings, this study shows that from 2017 to 2018, the pH and Cd content of the rivers at the confluence exceeded the irrigation limit and the water quality continued to deteriorate, which may pose a soil contamination risk. Long-term use of the river for irrigation water may cause toxic elements such as Cd, Fe, Mn, SO₄²⁻, Al, and F^- to enter the food chain, thereby endangering the life and health of villagers in Yudong River area.

分析了2017-2018年榆东河地区废弃矿山排水和河流水化学成分的季节和空间变化。评价了矿井排水对闭矿后河水的季节性和理化性质的影响，利用《农田灌溉水质标准》评价了河水灌溉的可行性和对农田的污染程度。结果表明，矿井水具有较低的 pH 值（< 3.5–4）和较高的总硬度 SO ₄ ²⁻、Fe、Al 和 Zn。此外，矿井水的 pH 值与其他金属离子的存在呈负相关。化学需氧量（COD）与Fe的相关系数达到0.989。平陆河和白水河污染程度较低，两河汇流区污染严重。但仅在禹东河与崇安河汇合后，Fe、Cd 含量略高于地表水环境质量标准。总体来看，汇流河重污染类型与矿井水污染一致。旱季水质略好于高水期。硫酸盐和铁含量分别下降了 39 和 16 毫克/升，镉含量下降了两倍。尽管有这些发现，但这项研究表明，从 2017 年到 2018 年，汇流处河流pH值和Cd含量超过灌溉限值，水质持续恶化，可能存在土壤污染风险。长期使用河流灌溉用水可能会产生镉、铁、锰、二氧化硫等有毒元素₄ ²⁻、Al、F ^-进入食物链，从而危及禹东河地区村民的生命健康。