This study analyzed the dynamics of major ions and trace elements along the groundwater flow path of the coastal sedimentary Todos Santos aquifer in Baja California Sur, Mexico, moderately impacted by anthropogenic activities. The results indicate that the elements Ca²⁺, Mg²⁺, Ba²⁺, Sr²⁺ and Li⁺ are mobilized from the aquifer matrix during seawater intrusion, whereas the alkali-elements Na⁺, K⁺ and Rb⁺ are removed from solution, possibly due to cationic exchange process. The anions HCO^3– and SO₄²⁻ and the elements I and B are mobilized due to carbonate mineral weathering, whereas dissolved silica and the halides Br⁻ and F⁻ behave conservatively during salinization. Groundwater NO₃⁻ is provided by sewage infiltration. Regarding trace elements behavior, we identify three groups: i) elements that are mobilized during saline intrusion (Fe, Co, V, Se, Re), ii) elements revealing low or no mobilization (Mo, Ni, Cr, Ta, W) and iii) elements that show an undefined tendency (U, As, Ge, Sb, Cu, Mn). The U and NO₃⁻ levels in groundwater should be considered carefully because several wells have concentrations close to the permissible levels. This study may be useful as reference for knowing the possible effect of salinization in coastal aquifers under sea level rise scenarios driven by climate change.

这项研究分析了人类活动对中部墨西哥湾南下加利福尼亚州沿海沉积Todos Santos含水层地下水流动路径中主要离子和微量元素的动态影响。结果表明，在海水入侵过程中，Ca 2 ⁺，Mg 2 ⁺，Ba 2 ⁺，Sr ²⁺和Li ⁺元素从含水层基质中迁移出来，而碱元素Na ⁺，K ⁺和Rb ⁺被去除。溶液，可能是由于阳离子交换过程。阴离子HCO ^3–和SO ₄ ²⁻并且由于碳酸盐矿物的风化I和B被动员的元素，而溶解的二氧化硅和卤化物溴^-和F ^-盐化期间的行为保守。地下水NO ₃ ^-是由污水浸润提供。关于微量元素的行为，我们确定了三类：i）在盐分入侵过程中动员的元素（Fe，Co，V，Se，Re），ii）缺乏动员的元素（Mo，Ni，Cr，Ta，W） iii）显示出不确定趋势的元素（U，As，Ge，Sb，Cu，Mn）。U和NO ₃ ^-应谨慎考虑地下水位，因为几口井的浓度接近允许的水平。这项研究对于了解气候变化驱动的海平面上升情景下沿海含水层盐碱化的可能影响可能具有参考价值。