Sand mining in the municipality of Seropédica, Rio de Janeiro, Brazil, has created large acidic lakes. This study evaluated the impact of water from sand pit lakes on the soil, leachate, and growth of Urochloa plants. Soil columns were sown with these plants and watered with five irrigation rates (treatments) with sand pit water and one treatment with pit water (control). A bottle was placed under each soil column to collect the leachate solution. The Ca²⁺, Mg²⁺, K⁺, Na⁺, Al³⁺, Fe³⁺, Si, P, N-NO₃⁻, and SO₄²⁻ contents in the leachate, and the soil pH, EC, (H⁺ + Al), Ca²⁺, Mg²⁺, K⁺, Na⁺, Al³⁺, Fe³⁺, and P contents were determined. Plant height, shoot and root dry matter, the contents, and accumulation of Ca, Mg, K, Na, Al, Fe, Mn, P, and N were evaluated. The results were analyzed by analysis of variance and regression models. The increase of the water from the pit lake reduced plant height, dry root, and shoot matter linearly. The Al and Fe contents in the roots were 10 times higher than in the shoots. No salinization or sodification of the soil occurred, but the Al³⁺ solubilization due to the low soil pH leads the increase of (H⁺ + Al). The acidity of the water and the low buffer capacity of the soil reduce its capacity to retain chemical elements. The Al, Fe, SO₄²⁻, and N-NO₃⁻ concentrations in the leachate were higher than those allowed by Brazilian groundwater laws. Under the experimental conditions, there is a potential risk of groundwater contamination.

巴西里约热内卢Seropédica市的沙土开采产生了大型酸性湖泊。这项研究评估了沙坑湖水对土壤，渗滤液和Urochloa植物生长的影响。用这些植物播种土壤柱，并用沙坑水以五种灌溉速率（处理）和坑水以一种灌溉方式（对照）浇水。在每个土壤柱下放置一个瓶子以收集渗滤液。钙²⁺，镁²⁺，K ⁺，钠⁺，铝³⁺，铁³⁺，Si，P或N-NO ₃ ^-和SO _4分^2-含量在渗滤液，和土壤pH，EC， （H ⁺+ Al），Ca 2 ⁺，Mg 2 ⁺，K ⁺，Na ⁺，Al ³⁺，Fe ³⁺和P含量。评价了株高，枝条和根系干物质，钙，镁，钾，钠，铝，铁，锰，磷和氮的含量和积累。通过方差分析和回归模型分析结果。坑湖中水的增加减少了植物的高度，根系的干枯和枝条的线性分布。根中的铝和铁含量比新梢高10倍。没有发生土壤盐碱化或盐碱化，但是由于土壤pH低而使Al ³⁺增溶导致（H ⁺+ Al）。水的酸度和土壤的低缓冲能力降低了其保留化学元素的能力。的铝，铁，SO ₄ ^2-，以及N-NO ₃ ^-的浓度在渗滤液均较巴西地下水法律允许的更高。在实验条件下，存在地下水污染的潜在风险。