The hydrogeochemical evolution and irrigation suitability assessment of groundwater in selected parts of Asaba, Nigeria, has been conducted. The purpose of this study was to ascertain the hydrogeochemical relations and interactions of groundwater with rocks, and also assess the usefulness of the groundwater for irrigation purpose. Twenty (20) groundwater samples were analyzed for physical and chemical compositions. All tested water parameters were within the WHO (2017) recommended standard for drinking water except for Fe²⁺, which showed worrisome amount. Furthermore, hydrogeochemical plot with Piper trilinear diagram showed that groundwater samples in the study area is sodium bicarbonate and mixed water types and Schoeller semi-logarithmic plot showed an ionic trend of HCO ⁻₃ + CO ²⁻₃ > Na⁺ + K⁺ > Mg²⁺ > Ca²⁺ > SO ²⁻₄ > Cl⁻. Langelier and Ludwig diagrams reveal that the hydrogeochemical evolution trend is towards the Cl⁻-SO ²⁻₄ -Na⁺ + K⁺ compositions. The indices of Chloro-Alkaline (CA) and Index Base Exchange (IBE) shows that the CA1 and CA2 are negative, implying that there is an exchange between (Na⁺ + K⁺) in the groundwater and (Ca²⁺ + Mg²⁺) of rocks. For the irrigation suitability, the SAR, %Na⁺, RSC, and MR ranged between 0.5 to1.49, 44.6 to 81.5, 0.48 to 2.02, and 9.61% to 98.8%, respectively. These imply that most of the tested groundwater could be used for irrigation purposes, while some are considered unfit for such. Therefore, regular routine assessment of the groundwater is recommended to ascertain its suitability for agriculture (irrigation) and domestic uses.

已经对尼日利亚阿萨巴选定地区的地下水进行了水文地球化学演变和灌溉适宜性评估。本研究的目的是确定地下水与岩石的水文地球化学关系和相互作用，并评估地下水用于灌溉目的的有用性。分析了二十 (20) 个地下水样品的物理和化学成分。除Fe ^{2+ 含量}令人担忧外，所有测试的水参数均在WHO（2017）推荐的饮用水标准范围内。此外，Piper三线图的水文地球化学图显示研究区地下水样品为碳酸氢钠和混合水类型，Schoeller半对数图显示HCO ^- ₃离子趋势 + CO ²⁻ ₃ > Na ⁺ + K ⁺ > Mg ²⁺ > Ca ²⁺ > SO ²⁻ ₄ > Cl ^-。Langelier 和 Ludwig 图显示水文地球化学演化趋势是向 Cl ^- -SO ^2- ₄ -Na ⁺ + K ⁺组成。Chloro-Alkaline (CA) 和 Index Base Exchange (IBE) 的指数显示 CA1 和 CA2 为负，表明地下水中的(Na ⁺ + K ⁺ ) 与 (Ca ²⁺ + Mg ^{2 +} ) 的岩石。对于灌溉适宜性，SAR、%Na ⁺、RSC 和 MR 分别介于 0.5 至 1.49、44.6 至 81.5、0.48 至 2.02 和 9.61% 至 98.8% 之间。这意味着大多数测试的地下水可用于灌溉目的，而有些则被认为不适合灌溉。因此，建议定期对地下水进行常规评估，以确定其对农业（灌溉）和家庭用途的适用性。