Comprehensive waste characterization and organic pollution co-occurrence in a Hg and As mining and metallurgy brownfield

Gallego, J.R.; Esquinas, N.; Rodríguez-Valdés, Eduardo; Menéndez-Aguado, Juan M.; Sierra, Carlos

doi:10.1016/j.jhazmat.2015.07.029

Cited by 68 publications

(18 citation statements)

References 35 publications

(34 reference statements)

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“…The solutions were diluted to 50 ml with ultrapure water and filtered through a 0.45-m-pore-size polytetrafluoroethylene (PTFE) filter prior to analysis. As, Cd, Zn, Cr, Ni, Cu, Pb, and Hg were quantified using an inductively coupled plasma mass spectrometer (ICP-MS; Agilent Technologies 7700 ICP-MS) using isotopic dilution analysis (IDA), as previously described (46).…”

Section: Methodsmentioning

confidence: 99%

Use of Endophytic and Rhizosphere Bacteria To Improve Phytoremediation of Arsenic-Contaminated Industrial Soils by Autochthonous Betula celtiberica

Mesa

Navazas

González-Gil

et al. 2017

Appl Environ Microbiol

115

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The aim of this study was to investigate the potential of indigenous arsenic-tolerant bacteria to enhance arsenic phytoremediation by the autochthonous pseudometallophyte The first goal was to perform an initial analysis of the entire rhizosphere and endophytic bacterial communities of the above-named accumulator plant, including the cultivable bacterial species.'s microbiome was dominated by taxa related to ,, and , especially the and genera. A total of 54 cultivable rhizobacteria and 41 root endophytes, mainly affiliated with the phyla, ,, and , were isolated and characterized with respect to several potentially useful features for metal plant accumulation, such as the ability to promote plant growth, metal chelation, and/or mitigation of heavy-metal stress. Seven bacterial isolates were further selected and tested for accumulation of arsenic in plants; four of them were finally assayed in field-scale bioaugmentation experiments. The exposure to arsenic caused an increase in the total nonprotein thiol compound content in roots, suggesting a detoxification mechanism through phytochelatin complexation. In the contaminated field, the siderophore and indole-3-acetic acid producers of the endophytic bacterial consortium enhanced arsenic accumulation in the leaves and roots of , whereas the rhizosphere isolate strain 91R mainly promoted plant growth. Field experimentation showed that additional factors, such as soil arsenic content and pH, influenced arsenic uptake in the plant, attesting to the relevance of field conditions in the success of phytoextraction strategies. Microorganisms and plants have developed several ways of dealing with arsenic, allowing them to resist and metabolize this metalloid. These properties form the basis of phytoremediation treatments and the understanding that the interactions of plants with soil bacteria are crucial for the optimization of arsenic uptake. To address this in our work, we initially performed a microbiome analysis of the autochthonous plants growing in arsenic-contaminated soils, including endosphere and rhizosphere bacterial communities. We then proceeded to isolate and characterize the cultivable bacteria that were potentially better suited to enhance phytoextraction efficiency. Eventually, we went to the field application stage. Our results corroborated the idea that recovery of pseudometallophyte-associated bacteria adapted to a large historically contaminated site and their use in bioaugmentation technologies are affordable experimental approaches and potentially very useful for implementing effective phytoremediation strategies with plants and their indigenous bacteria.

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Section: Methodsmentioning

confidence: 99%

Use of Endophytic and Rhizosphere Bacteria To Improve Phytoremediation of Arsenic-Contaminated Industrial Soils by Autochthonous Betula celtiberica

Mesa

Navazas

González-Gil

et al. 2017

Appl Environ Microbiol

115

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“…In the topsoil layer (0-20 cm), concentrations of 16 PAHs ranged from 2.16 to 33.52 mg kg À1 , with a mean value of 11.94 mg kg À1 , much higher than that reported in agricultural soils, 25,26 urban soils, 27 coal and coal gangue, 28 whereas slightly lower than the concentrations of ue dust in a Hg and As mining and metallurgy browneld. 29 The 7 probable human carcinogenic PAHs (including BaA, Chry, BbF, BkF, BaP, DahA, and InP) ranged from 1.09 mg kg À1 to 16.47 mg kg À1 , which was much higher than that in the soils around the Anhui coal district, China, 30 and even higher than that of the highly industrialized chemical/petrochemical area. 31 The average concentrations of Pyr and BbF were higher and similar, all higher than 1.70 mg kg À1 .…”

Section: Concentrations Of Pahs In the Soil Samplesmentioning

confidence: 95%

Polycyclic aromatic hydrocarbons in the soil profiles (0–100 cm) from the industrial district of a large open-pit coal mine, China

Liu

Bai

et al. 2017

RSC Adv.

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“…A second hypothesis could be the influence of former Hg mining and metallurgy activities that were carried out in the region up until the 1970s and the subsequent abandonment of huge amounts of Hg waste. This is highly likely in the case of the sites known as La Soterraña [30], El Terronal [16] and their surroundings (Fig. 1a), as a consequence of which the river sediments in the hydrographic basin where these sites are located were also affected [19].…”

Section: Discussionmentioning

confidence: 99%

Assessment of mercury pollution sources in beach sand and coastal soil by speciation analysis

et al. 2019

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Background: An essential requisite for controlling and monitoring mercury in the environment is to identify its species in different types of soils and sediments, as this will help not only to establish its mobility in the environment and ecosystem and the degree of its toxicity, but also to establish the source of contamination. The objective of this work was to identify the origin of mercury in beach sands and soil taken from a coastal region with previously high mining and industrial activity by characterizing the mercury species using the technique known as thermal desorption (HgTPD). Results: Apart from quartz, the main mineral species identified in the raw sands and soil were calcite, fluorite and barite. The concentration of mercury ranges from 5 to 23 µg g −1 , and although it is distributed in different proportions in the function of the size, thermal desorption profiles demonstrated that the mercury species present in the samples do not vary with the mercury concentration and the particle size. By means of HgTPD, mercury oxide (HgO) was identified in the beach sands, whereas mercury sulfide (HgS) was found in the soil sample taken from the vicinity of the beach. Complementary methodologies foster the HgTPD conclusions and verify that mercury is present mostly in insoluble stable (HgS) or low-mobility (HgO) forms in the samples studied. Analyses by ICP-MS after sequential extraction and HPLC separation of mercury species show that inorganic mercury is the predominant form in the samples. Conclusions: The technique HgTPD is a very useful tool to ascertain the origin of mercury in contaminated beach sands and shoreline soils. In the particular area studied in this work, the species identified indicate that previous mining activity was the source of the mercury and rule out the possibility that contamination is derived from coal combustion activities ongoing in the region.

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Comprehensive waste characterization and organic pollution co-occurrence in a Hg and As mining and metallurgy brownfield

Cited by 68 publications

References 35 publications

Use of Endophytic and Rhizosphere Bacteria To Improve Phytoremediation of Arsenic-Contaminated Industrial Soils by Autochthonous Betula celtiberica

Use of Endophytic and Rhizosphere Bacteria To Improve Phytoremediation of Arsenic-Contaminated Industrial Soils by Autochthonous Betula celtiberica

Polycyclic aromatic hydrocarbons in the soil profiles (0–100 cm) from the industrial district of a large open-pit coal mine, China

Assessment of mercury pollution sources in beach sand and coastal soil by speciation analysis

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