Relationships Between Conductivity and pH in Channels Exposed to Acid Mine Drainage Processes: Study of a Large Mass of Data Using Classical Statistics

Grande, J. A.; Jiménez, A.; Borrego, J.; Torre, M. L. de la; Gómez, T.

doi:10.1007/s11269-010-9680-2

Cited by 21 publications

(9 citation statements)

References 28 publications

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“…The lowest conductivity was observed at the Parahimayco1-Ph1 (15.3 µS•cm −1 ), while the highest was at a small tributary of the CRB, the Reventador2-Rev2 (902 µS•cm −1 ). Conductivity is usually related to the presence of ionic compounds such as pollutants from mining [80]. Conductivity had a positive correlation with the pH (0.70, p < 0.05), total P (0.59), and elevation (0.65).…”

Section: Physical Chemical Analysismentioning

confidence: 99%

Variations in Benthic Macroinvertebrate Communities and Biological Quality in the Aguarico and Coca River Basins in the Ecuadorian Amazon

Cabrera

Forio

Lock

et al. 2021

Water

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Adequate environmental management in tropical aquatic ecosystems is imperative. Given the lack of knowledge about functional diversity and bioassessment programs, management is missing the needed evidence on pollution and its effect on biodiversity and functional ecology. Therefore, we investigated the composition and distribution of the macroinvertebrate community along two rivers. Specifically, 15 locations were sampled in the Coca and Aguarico Rivers (Ecuadorian Amazon) and the macroinvertebrates were used to indicate water quality (WQ), expressed as the Biological Monitoring Working Party Colombia (BMWP-Col) classes. Results indicate that elevation, pH, temperature, width, and water depth played an important role in the taxa and functional feeding groups (FFG) composition. The results show that diversity of taxa and FFG were generally scarce but were more abundant in good quality sites. Collector-gathers (CG) were, in general, dominant and were particularly abundant at low WQ and downstream sites. Scrapers (SC) were the second most abundant group, dominating mostly at good WQ and upstream sites. Predators (PR) were homogeneously distributed among the sites, without clear dominance, and their abundance was slightly higher in sites with medium-low WQ and downstream sites. Lastly, both shredders (SH) and collector-filterers (CF) were almost absent and were more abundant in good quality sites. The findings of this research can be used as baseline information in the studied region since a dam was constructed two years after the sampling campaign, which has been operating since. Furthermore, the results can be used to fill the knowledge gaps related to the bioassessments of other similar systems, particularly for a tropical rainforest.

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Section: Physical Chemical Analysismentioning

confidence: 99%

Variations in Benthic Macroinvertebrate Communities and Biological Quality in the Aguarico and Coca River Basins in the Ecuadorian Amazon

Cabrera

Forio

Lock

et al. 2021

Water

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“…The AMD and ARD processes that affect the regional drainage network have been extensively described by several authors (Aroba et al, 2007;Borrego, 1992: Borrego et al, 2002Borrego et al, 2011;Carro et al, 2011;Braungardt et al, 1998;Davis et al, 2000;de la Torre et al, 2009;de la Torre et al, 2010;de la Torre et al, 2011;Elbaz-Poulichet et al, 1999;Elbaz-Poulichet et al, 2000;Elbaz-Poulichet et al, 2001;Grande, 2011;Grande et al, 2000;Grande et al 2003a;Grande et al, 2003b;Grande et al, 2005a;Grande et al, 2005b;Grande et al, 2007;Grande et al, 2010a;Grande et al, 2010b;Grande et al, 2010c;Grande et al, 2010d;Grande et al, 2010e;Grande et al, 2011a;Grande et al, 2011b;Jiménez et al, 2009;Leblanc et al, 2000;Sáinz et al, 2002;Sáinz et al, 2003a;Sáinz et al, 2004;Sáinz et al, 2005).…”

Section: Introductionmentioning

confidence: 97%

Stratification of Metal and Sulphate Loads in Acid Mine Drainage Receiving Water Dams – Variables Regionalization by Cluster Analysis

Grande

Torre²,

Valente³

et al. 2015

Water Environment Research

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The Sancho Reservoir (Iberian Pyrite Belt, SW Spain) is nourished by the waters of the river Meca, which is affected by acid mine drainage (AMD) processes from the abandoned Tharsis mine. The aim of the present work is to study the hydrochemical variations in this reservoir, in order to define potential stratification processes in metal load and sulphates. A stratified sampling from the surface, with one meter deep intervals to the bottom of the dam, was performed. The results show a clear stratification of temperature, pH, electric conductivity, dissolved oxygen, metal and sulphate loads associated with depth. There is an increase of metal loads at the bottom of the reservoir, though previous studies only detect iron. The proximity between pH and aluminium suggests that water chemistry is strongly influenced by aluminium precipitation processes. This indicates the buffer effect that aluminium exercises, which precipitates as amorphous or low crystalline phases, introducing hydrogen ions to the system, while alkalinity input tends to raise pH.

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“…The most common phenomenon associated with sulfide-type ores is the production of acidic solutions, which result from oxidation of various metals’ sulfides (e.g., pyrite, marcasite). The problem of acid mine drainage or acid rock drainage is widely described in literature (e.g., Banks et al 1997 ; Gray 1997 ; Sainz et al 2003 , 2004 Johnson and Hallberg 2005 ; Grande et al 2010 , 2013 , 2018 ; Bauerek et al 2013 ), but some aspects of neutral or circumneutral drainage are still not fully recognized. This applies to ore deposits occurring in carbonate rocks and the presence of toxic metals and other microelements in mine waters.…”

Section: Introductionmentioning

confidence: 99%

Selected trace elements and metals in groundwater within Permian sediments near Olkusz (Zn-Pb ore mining region, S Poland)

Postawa

Motyka

2018

Environ Sci Pollut Res

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The extensive mining of Zn-Pb ores in the Olkusz region resulted in significant changes of both water table level and chemical composition of water in all aquifers in the area. This was caused by intensive dewatering of mining excavations and development of a thick aeration zone reaching 150 m in a central part of the area. That created favorable conditions for oxidation of metal sulfides occurring in the ore-bearing dolomites (Middle Triassic) and started the process of forming readily soluble hydroxysulphates which then migrated to lower aquifers, including the Permian. As a result of those processes, various metals and other elements toxic to the water environment appeared in leaks observed in mine galleries. Changes in concentrations of selected elements (Fe, Mn, Zn, Pb, Cu, Ba, Ni, Co, As, Cr, Hg, Tl, Ag, Cd, B) in mine waters over the period of the last nearly 50 years were described. Water samples were collected from exploratory boreholes, piezometers, and wells located in investigated area inflows and seepages occurring in shafts and drifts excavated in Permian conglomerates. Mean concentrations of metals (Pb, Cd, Cr, Hg, Tl) and other toxic elements were surprisingly low; Pb, 3.94 μg/L; Cd, 0.2 μg/L; Cr, up to 2.26 μg/L; Hg, 0.25 μg/L; Tl, 3.59 μg/L; and As, 6.31 μg/L. However, the observed concentrations varied significantly over time, reaching respectively up to 190 μg Pb/L, 60 μg Cd/L, 15.6 μg Cr/L, 2.67 μg Hg/L, 81.3 μg Tl/L, and 155 μg As/L.

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Relationships Between Conductivity and pH in Channels Exposed to Acid Mine Drainage Processes: Study of a Large Mass of Data Using Classical Statistics

Cited by 21 publications

References 28 publications

Variations in Benthic Macroinvertebrate Communities and Biological Quality in the Aguarico and Coca River Basins in the Ecuadorian Amazon

Variations in Benthic Macroinvertebrate Communities and Biological Quality in the Aguarico and Coca River Basins in the Ecuadorian Amazon

Stratification of Metal and Sulphate Loads in Acid Mine Drainage Receiving Water Dams – Variables Regionalization by Cluster Analysis

Selected trace elements and metals in groundwater within Permian sediments near Olkusz (Zn-Pb ore mining region, S Poland)

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