Aragonite crystallization in a sulfate-rich hypersaline wetland under dry Mediterranean climate (Laguna Honda, eastern Guadalquivir basin, S Spain)

Medina-Ruiz, Antonio; Jiménez-Millán, Juan; Abad, Isabel; Gálvez, Antonio; Grande, María José; Jiménez-Espinosa, Rosario

doi:10.1016/j.scitotenv.2024.171362

Cited by 1 publication

(10 citation statements)

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“…Therefore, the presence of illite particles suspended in the waters of Laguna Honda coming from the weathering and transport of the sedimentary surrounding materials can affect the aggregation, transport, and deposition processes of the gold nanoparticles. Medina et al [ 29 ] revealed that the sediments deposited in Laguna Honda are mainly made from silicates, with illite being the most abundant clay mineral (up to 60%), as well as some authigenic carbonates and sulfates. Sastre et al [ 49 ] indicated that erosion in Mediterranean olive groves is reinforced by hilly terrain, bare soil, and high-intensity rainfall.…”

Section: Discussionmentioning

confidence: 99%

“…Sastre et al [ 49 ] indicated that erosion in Mediterranean olive groves is reinforced by hilly terrain, bare soil, and high-intensity rainfall. The abundant influx of illite into the Laguna Honda lake was produced by the natural weathering, erosion, and transport of the CSCs surrounding reliefs favored by negative agricultural practices, e.g., [ 50 , 51 ], leading to the absence of vegetation cover in the olive groves surrounding the wetland [ 29 ].…”

Section: Discussionmentioning

confidence: 99%

“…Medina et al [ 29 ] revealed the presence of relevant populations of SRB and SOB in the Laguna Honda sediments. SRB from the Desulfobacterota ( Desulfatiglandaceae fam.…”

Section: Discussionmentioning

confidence: 99%

“…An extended characterization of the wetland origin and hydrochemistry, vegetation composition, mineral sediment constituents, and inhabitant microorganisms can be found in Medina et al [ 26 , 27 , 28 , 29 ]. The wetland waters are hypersaline (salinity around 48 PSU) and alkaline (pH > 9.2) ( Table 1 ).…”

Section: Methodsmentioning

confidence: 99%

“…The experimental procedures employed to obtain the physicochemical parameters of the waters and sediments, including X-ray diffraction, as well as the TOC analysis and microbiological characterization indicated in the previous section, are described in Medina et al [ 29 ], and samples were obtained from 24 sampling points ( Figure 2 C). A network made from two transversal sections was created to select the sampling points: an approximately N–S main section parallel to the elongation of the wetland lake and another approximately E–W section.…”

Section: Methodsmentioning

confidence: 99%

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Anomalous Gold Concentrations in Hypersaline Wetland Sediments (Laguna Honda, South Spain) Caused by Nanoparticles Used in Agricultural Practices: Environmental Transformation

Medina-Ruiz,

Jiménez-Millán,

Abad

et al. 2024

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Illite-rich sediments from the Laguna Honda wetland, an eutrophicated hypersaline wetland with waters enriched in Mg and Ca surrounded by olive groves in the Guadalquivir Basin River (South Spain), are polluted by elevated concentrations of gold (up to 21.9 ppm) due to agricultural practices. The highest gold contents appear in the shore sediments of the lake, where up to 20 µm homoaggregates of fused gold nanoparticles (AuNp) are found. Small nanoaggregates of up to six fused gold nanoparticles and very few isolated nanoparticles around 1 nm in size can also be observed to form heteroaggregates of AuNp-mica, especially in the deeper sediments in the central part of the wetland, where Au concentrations are lower (up to 1.89 ppm). The high nanoparticle concentration caused by the inappropriate application of pesticides favors nanoparticle collision in the wetland’s Mg- and Ca-rich waters and the fast coagulation and deposition of Au homoaggregates in the gold-rich shore sediment of the lake. The interaction of gold nanoparticles with the abundant illite particles in the wetland’s hypersaline waters promotes the simultaneous formation of low-density Au-illite heteroaggregates, which are transported and deposited in the less-rich-in-gold sediments of the central part of the lake. The small sizes of the isolated AuNp and AuNp-fused contacts of the aggregates suggest modifications in the original nanoparticles involving dissolution processes. The presence of bacterial communities resistant to heavy metal stress (Luteolibacter and Maricaulis), as well as the activity of sulfate-reducing bacteria (SRB) and particularly sulfur-oxidizing bacteria (SOB) communities from the shore sediments, favored the high-Eh and low-pH conditions adequate for the destabilization and transport of AuNp.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…Medina et al [ 29 ] revealed the presence of relevant populations of SRB and SOB in the Laguna Honda sediments. SRB from the Desulfobacterota ( Desulfatiglandaceae fam.…”

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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