Biomonitoring toxic and essential element accumulation in trout in the as pontes mine pit lake (NW Spain).

This study investigated the accumulation of toxic and essential elements in trout from a pit lake situated in the surroundings of the abandoned As Pontes de García Rodríguez lignite mine (NW Spain). The element concentrations were compared with those measured in fish from upstream of the River Eume and from a local fish farm. Liver and muscle samples from fish captured in the lake (n = 16), river (n = 14) and fish farm (n = 10) captured in March-April 2022 were acid digested and analyzed by ICP-MS.

Analysis of the reduction processes at the bottom of Lake Meirama: a singular case of lake formation.

The formation of natural lakes is a process that takes place over thousands of years, although the volumetric formation depends on hydrological and climatological phenomena, reaching a stationary hydraulic regime, the evolution of hydrochemistry is more complex and obeys not only phenomena of stoichiometry and chemical kinetics but also diffusion processes. Depending on the depth of the lakes, the anoxization process originating from the bottom is the first phase of the lake's methanogenesis. For this, the course of many thousands of years is necessary, so the studies carried out in the lakes are limited to the current knowledge of the state in which they are, without being able to have real information in this process of methanogenesis.

Comparative hydrochemical analysis of the formation of the mining lakes of As Pontes and Meirama (Spain).

The old lignite mines of As Pontes and Meirama are located in the northwest of Spain, an approximate distance of 80 km between them. Both ended their extractive activity at the end of 2007; the respective mining pits began to be filled at the beginning of 2008. The filling process, enabled by the deviation of nearby rivers, differed between the two cases, taking approximately 4 and a half years to completely fill the 547-hm hole at As Pontes and 8 years and 2 months to fill the 146-hm hole at Meirama.

WITHDRAWN: Non-isothermal multiphase flow and reactive transport modelling of compacted bentonite simultaneously heated and hydrated.

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