Mobilization of Heavy Metals in a Saline Confined Aquifer as a Consequence of Rainwater Injection: A Case Study in Southern Vietnam.

An artificial recharge test was performed in Ho Chi Minh City, Vietnam to see the geochemical response of a saline coastal plain aquifer to the injected rainwater. The results show that the rainwater injection can cause mobilization of heavy metals due to pyrite oxidation and this phenomenon can persist even after the full recovery of the injected water. In this study, a 30-m-deep well was installed in a confined aquifer.

A multi-tracer approach to disentangle anthropogenic emissions from natural processes in the St. Lawrence River and Estuary.

The ability to differentiate anthropogenic signatures from natural processes in complex hydrological systems is critical for environmental regulation perspectives, especially to curb pollution and implement effective water management strategies. Here, we report variations in the concentrations of 57 chemical variables, including nutrients, major, trace and ultra-trace elements, as well as the concentrations of Escherichia coli in different water masses along the St. Lawrence River-Estuary continuum.

Groundwater in Southern Vietnam: Understanding geochemical processes to better preserve the critical water resource.

A thorough understanding of groundwater geochemical characteristics and dominant hydro(bio)geochemical processes in the aquifers is valuable for sustainable groundwater protection. With this respect, this study provides a comprehensive assessment of hydrogeochemical characteristics of groundwater in sedimentary aquifers of the Southern region of Vietnam. The dataset comprised 291 water samples collected in rainy and dry seasons from 155 wells, and their chemical compositions of dissolved ions (Ca, Mg, Na, K, HCO, Cl, SO, NO, NH, Fe, total dissolved solids) and pH.

Occurrence of metal-rich acidic groundwaters around the Mekong Delta (Vietnam): A phenomenon linked to well installation.

Acidic groundwaters enriched with heavy metals are frequently observed in the coastal plain aquifers. The acidic pHs are observed even in the deep confined aquifers in southern Vietnam. This study geochemically explores the causes of these acidic groundwaters by investigating 41 groundwater samples, 4 soil samples and a 54 m long sediment core and the long-term monitoring data (4189 observations) obtained from 178 wells of the National Groundwater Monitoring Network for the South of Vietnam (NGMNS).