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Vipindas PV, Venkatachalam S, Jabir T, Yang EJ, Jung J, Jain A, Krishnan KP. Salinity-controlled distribution of prokaryotic communities in the Arctic sea-ice melt ponds. World J Microbiol Biotechnol 2023; 40:25. [PMID: 38057653 DOI: 10.1007/s11274-023-03850-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Accepted: 11/22/2023] [Indexed: 12/08/2023]
Abstract
The thawing of snow and sea ice produces distinctive melt ponds on the surface of the Arctic sea ice, which covers a significant portion of the surface sea ice during summer. Melt-pond salinity impacts heat transfer to the ice below and the melting rate. It is widely known that melt ponds play a significant role in heat fluxes, ice-albedo feedback, and sea-ice energy balance. However, not much attention has been given to the fact that melt ponds also serve as a unique microbial ecosystem where microbial production begins as soon as they are formed. Here, we investigated the role of melt pond salinity in controlling the diversity and distribution of prokaryotic communities using culture-dependent and -independent approaches. The 16 S rRNA gene amplicon based next generation sequencing analysis retrieved a total of 14 bacterial phyla, consisting of 146 genera, in addition to two archaeal phyla. Further, the culture-dependent approaches of the study allowed for the isolation and identification of twenty-four bacterial genera in pure culture. Flavobacterium, Candidatus_Aquiluna, SAR11 clade, Polaribacter, Glaciecola, and Nonlabens were the dominant genera observed in the amplicon analysis. Whereas Actimicrobium, Rhodoglobus, Flavobacterium, and Pseudomonas were dominated in the culturable fraction. Our results also demonstrated that salinity, chlorophyll a, and dissolved organic carbon were the significant environmental variables controlling the prokaryotic community distribution in melt ponds. A significant community shift was observed in melt ponds when the salinity changed with the progression of melting and deepening of ponds. Different communities were found to be dominant in melt ponds with different salinity ranges. It was also observed that melt pond prokaryotic communities significantly differed from the surface ocean microbial community. Our observations suggest that complex prokaryotic communities develop in melt ponds immediately after its formation using dissolved organic carbon generated through primary production in the oligotrophic water.
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Affiliation(s)
- Puthiya Veettil Vipindas
- Arctic Ecology and Biogeochemistry Division, National Centre for Polar and Ocean Research, Ministry of Earth Sciences, Vasco-da-Gama, Goa, 403 804, India.
| | - Siddarthan Venkatachalam
- Arctic Ecology and Biogeochemistry Division, National Centre for Polar and Ocean Research, Ministry of Earth Sciences, Vasco-da-Gama, Goa, 403 804, India
| | - Thajudeen Jabir
- Arctic Ecology and Biogeochemistry Division, National Centre for Polar and Ocean Research, Ministry of Earth Sciences, Vasco-da-Gama, Goa, 403 804, India
| | - Eun Jin Yang
- Division of Polar Ocean Sciences, Korea Polar Research Institute, 26 Songdo-dong, Yeonsu-gu, Incheon, 21990, Republic of Korea
| | - Jinyoung Jung
- Division of Polar Ocean Sciences, Korea Polar Research Institute, 26 Songdo-dong, Yeonsu-gu, Incheon, 21990, Republic of Korea
| | - Anand Jain
- Arctic Ecology and Biogeochemistry Division, National Centre for Polar and Ocean Research, Ministry of Earth Sciences, Vasco-da-Gama, Goa, 403 804, India
| | - Kottekkatu Padinchati Krishnan
- Arctic Ecology and Biogeochemistry Division, National Centre for Polar and Ocean Research, Ministry of Earth Sciences, Vasco-da-Gama, Goa, 403 804, India
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Qi Z, Wang Z, Yu Y, Yu X, Sun R, Wang K, Xiong D. Formation of oil-particle aggregates in the presence of marine algae. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2023; 25:1438-1448. [PMID: 37424387 DOI: 10.1039/d3em00092c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/11/2023]
Abstract
After an oil spill, the formation of oil-particle aggregates (OPAs) is associated with the interaction between dispersed oil and marine particulate matter such as phytoplankton, bacteria and mineral particles. Until recently, the combined effect of minerals and marine algae in influencing oil dispersion and OPA formation has rarely been investigated in detail. In this paper, the impacts of a species of flagellate algae Heterosigma akashiwo on oil dispersion and aggregation with montmorillonite were investigated. This study has found that oil coalescence is inhibited due to the adhesion of algal cells on the droplet surface, causing fewer large droplets to be dispersed into the water column and small OPAs to form. Due to the role of biosurfactants in the algae and the inhibition of algae on the swelling of mineral particles, both the oil dispersion efficiency and oil sinking efficiency were improved, which reached 77.6% and 23.5%, respectively at an algal cell concentration (Ca) of 1.0 × 106 cells per mL and a mineral concentration of 300 mg L-1. The volumetric mean diameter of the OPAs decreased from 38.4 μm to 31.5 μm when Ca increased from 0 to 1.0 × 106 cells per mL. At higher turbulent energy, more oil tended to form larger OPAs. The findings may add knowledge about the fate and transport of spilled oil and provide fundamental data for oil spill migration modelling.
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Affiliation(s)
- Zhixin Qi
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China.
| | - Zhennan Wang
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China.
| | - Yue Yu
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China.
- National Maritime Environmental Monitoring Center, Dalian 116023, China
| | - Xinping Yu
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China.
| | - Ruiyang Sun
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China.
| | - Kaiming Wang
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China.
| | - Deqi Xiong
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China.
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Bagi A, Knapik K, Baussant T. Abundance and diversity of n-alkane and PAH-degrading bacteria and their functional genes - Potential for use in detection of marine oil pollution. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 810:152238. [PMID: 34896501 DOI: 10.1016/j.scitotenv.2021.152238] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 11/26/2021] [Accepted: 12/03/2021] [Indexed: 06/14/2023]
Abstract
Monitoring environmental status through molecular investigation of microorganisms in the marine environment is suggested as a potentially very effective method for biomonitoring, with great potential for automation. There are several hurdles to that approach with regards to primer design, variability across geographical locations, seasons, and type of environmental pollution. Here, qPCR analysis of genes involved in the initial activation of aliphatic and aromatic hydrocarbons were used in a laboratory setup mimicking realistic oil leakage at sea. Seawater incubation experiments were carried out under two different seasons with two different oil types. Degenerate primers targeting initial oxygenases (alkane 1-monooxygenase; alkB and aromatic-ring hydroxylating dioxygenase; ARHD) were employed in qPCR assays to quantify the abundance of genes essential for oil degradation. Shotgun metagenomics was used to map the overall community dynamics and the diversity of alkB and ARHD genes represented in the microbial community. The amplicons generated through the qPCR assays were sequenced to reveal the diversity of oil-degradation related genes captured by the degenerate primers. We identified a major mismatch between the taxonomic diversity of alkB and ARHD genes amplified by the degenerate primers and those identified through shotgun metagenomics. More specifically, the designed primers did not amplify the alkB genes of the two most abundant alkane degraders that bloomed in the experiments, Oceanobacter and Oleispira. The relative abundance of alkB sequences from shotgun metagenomics and 16S rRNA-based Oleispira-specific qPCR assay were better signals for oil in water than the tested qPCR alkB assay. The ARHD assay showed a good agreement with PAHs degradation despite covering only 25% of the top 100 ARHD genes and missing several abundant Cycloclasticus sequences that were present in the metagenome. We conclude that further improvement of the degenerate primer approach is needed to rely on the use of oxygenase-related qPCR assays for oil leakage detection.
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Affiliation(s)
- Andrea Bagi
- NORCE Norwegian Research Centre, Bergen, Norway.
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Brakstad OG, Altin D, Aas M, Skancke J, Nordtug T, Farkas J. Attachment of APAM to mineral particles in seawater. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 758:143888. [PMID: 33333302 DOI: 10.1016/j.scitotenv.2020.143888] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 11/18/2020] [Accepted: 11/18/2020] [Indexed: 06/12/2023]
Abstract
Polymer injection is used in enhanced oil recovery (EOR) when an oil field ages and the pressure in the reservoir decreases, or for oil fields with heavy oil. By polymer injection, the viscosity of the water injected for pressure support is increased by mixing with a high concentration of a polymer solution. Polymers used in EOR operations are often high molecular weight polyacrylamides, including anionic polyacrylamide (APAM), which may subsequently enter the marine environment with produced water releases. Since seawater (SW) contains mineral particles (MPs) in low concentrations, and polymers like APAM are known to flocculate MPs, we investigated if APAM at different concentrations (0.5-10 mg/L) would attach and flocculate MPs, when these occurred in concentrations relevant for oceanic SW (1 mg/L). Two types of MPs, diatomaceous earth and kaolin, were exposed to fluorescence-tagged APAM (APAM-TAG). A low-energy carousel system with natural seawater (SW) was used for incubation of MPs and APAM-TAG at a temperature relevant for the Norwegian Continental Shelf (13 °C). Attachment to MPs and aggregates of these were analysed by fluorometry and fluorescence microscopy. Particle analyses showed that only minor fractions of the MPs aggregated. When samples were separated in steel filter with a mesh size of 20 μm, APAM-TAG was mainly measured in the flow-through fraction (<20 μm), and the results therefore showed that the polymer mainly remained in the water-phase, or was attached to small particles (<20 μm). For the small fraction of APAM attaching to aggregated MPs, attraction to kaolin was higher than to diatomaceous earth, and fluorescence microscopy analyses confirmed the presence of fluorescent particles at the higher APAM concentrations. MPs at concentrations relevant for oceanic SW are therefore not expected to significantly contribute to sedimentation of APAM dissolved in the water column.
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Affiliation(s)
| | | | - Marianne Aas
- SINTEF Ocean AS, Environment and New Resources, Trondheim, Norway
| | - Jørgen Skancke
- SINTEF Ocean AS, Environment and New Resources, Trondheim, Norway
| | - Trond Nordtug
- SINTEF Ocean AS, Environment and New Resources, Trondheim, Norway
| | - Julia Farkas
- SINTEF Ocean AS, Environment and New Resources, Trondheim, Norway
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Henry IA, Netzer R, Davies E, Brakstad OG. The influences of phytoplankton species, mineral particles and concentrations of dispersed oil on the formation and fate of marine oil-related aggregates. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 752:141786. [PMID: 32890829 DOI: 10.1016/j.scitotenv.2020.141786] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Revised: 08/12/2020] [Accepted: 08/17/2020] [Indexed: 06/11/2023]
Abstract
The formation and fallout of oil-related marine snow have been associated with interactions between dispersed oil and small marine particles, like phytoplankton and mineral particles. In these studies, the influences of phytoplankton species, mineral particle concentration, and oil concentration on the aggregation of oil in seawater (SW) were investigated. The experiments were performed in a low-turbidity carousel incubation system, using natural SW at 13 °C. Aggregation was measured by silhouette camera analyses, and oil compound group distribution and depletion by gas chromatography (GC-FID or GC-MS). Aggregates with median sizes larger than 500 μm in diameter were measured in the presence of dispersed oil and the phytoplankton species Thalassiosira rotula, Phaeocystis globosa, Skeletonema pseudocostatum, but not with the microalgae Micromonas pusilla. When mineral particles (diatomaceous earth) were incubated at different concentrations (5-30 mg/L) with dispersed oil and S. pseudocostatum, the largest aggregates were measured at the lower mineral particle concentration (5 mg/L). Since dispersed oil rapidly dilutes in the marine water column, experiments were performed with oil concentrations of from 10 mg/L to 0.01 mg/L in the presence of S. pseudocostatum and diatomaceous earth. Aggregates larger than 500 μm was measured only at the highest oil concentrations (10 mg/L). However, oil attachment to the marine particles were also measured at low oil concentrations (≤1 mg/L). Depletion of oil compound groups (n-alkanes, naphthalenes, PAHs, decalins) were measured at all oil concentrations, both in aggregate and water phases, with biodegradation as the expected main depletion process. These results showed that oil concentration may be important for oil-related marine snow formation, but that even oil droplets at low concentrations may attach to the particles and be transported by prevailing currents.
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Affiliation(s)
- Ingrid A Henry
- SINTEF Ocean AS, Environment and New Resources, Trondheim, Norway
| | - Roman Netzer
- SINTEF Ocean AS, Environment and New Resources, Trondheim, Norway
| | - Emlyn Davies
- SINTEF Ocean AS, Environment and New Resources, Trondheim, Norway
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Henry IA, Netzer R, Davies EJ, Brakstad OG. Formation and fate of oil-related aggregates (ORAs) in seawater at different temperatures. MARINE POLLUTION BULLETIN 2020; 159:111483. [PMID: 32892918 DOI: 10.1016/j.marpolbul.2020.111483] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Revised: 06/21/2020] [Accepted: 07/13/2020] [Indexed: 06/11/2023]
Abstract
In this study, the formation and fate of oil-related aggregates (ORAs) from chemically dispersed oil in seawater (SW) were investigated at different temperatures (5 °C, 13 °C, 20 °C). Experiments in natural SW alone, and in SW amended with typical marine snow constituents (phytoplankton and mineral particles), showed that the presence of algae stimulated the formation of large ORAs, while high SW temperature resulted in faster aggregate formation. The ORAs formed at 5 °C and 13 °C required mineral particles for sinking, while the aggregates also sank in the absence of mineral particles at 20°. Early in the experimental periods, oil compound accumulation in ORAs was faster than biodegradation, particularly in aggregates with algae, followed by rapid biodegradation. High abundances of bacteria associated with hydrocarbon biodegradation were determined in the ORAs, together with algae-associated bacteria, while clustering analyses showed separation between bacterial communities in experiments with oil alone and oil with algae/mineral particles.
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Affiliation(s)
- Ingrid A Henry
- SINTEF Ocean AS, Environment and New Resources, Trondheim, Norway
| | - Roman Netzer
- SINTEF Ocean AS, Environment and New Resources, Trondheim, Norway
| | - Emlyn J Davies
- SINTEF Ocean AS, Environment and New Resources, Trondheim, Norway
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Zhang Y, Lin DF, Hao J, Zhao ZH, Zhang YJ. The crucial role of bacterial laccases in the bioremediation of petroleum hydrocarbons. World J Microbiol Biotechnol 2020; 36:116. [PMID: 32661601 DOI: 10.1007/s11274-020-02888-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 07/02/2020] [Indexed: 12/15/2022]
Abstract
Laccases (EC 1.10.3.2) are a class of metallo-oxidases found in a variety of fungi, plants, and bacteria as well as in certain insects. They can oxidize a wide variety of organic compounds and can be widely applied in many fields, especially in the field of biodegradation and detoxification of environmental pollutants. The practical efficacy of laccases depends on their ability to capture the target substance as well as their catalytic activity, which is related to their catalytic center, substrate selectivity, and substrate tolerance. Over the past few decades, many laccases have been identified in plants and fungi. Concurrently, bacterial laccases have received increasing attention because of their high thermostability and high tolerance to organic compounds. The aim of this review is to summarize the role of bacterial laccases in the bioremediation of petroleum hydrocarbons and to outline the correlation between the molecular structure of the mononuclear T1 Cu center of bacterial laccases and their substrate preference.
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Affiliation(s)
- Yan Zhang
- Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education, Jilin University, Changchun, 130012, People's Republic of China
| | - Dong-Fa Lin
- Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education, Jilin University, Changchun, 130012, People's Republic of China
| | - Jun Hao
- Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education, Jilin University, Changchun, 130012, People's Republic of China
| | - Zhi-Hao Zhao
- Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education, Jilin University, Changchun, 130012, People's Republic of China
| | - Ying-Jiu Zhang
- Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education, Jilin University, Changchun, 130012, People's Republic of China. .,School of Life Science, Jilin University, Changchun, 130012, People's Republic of China.
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Brakstad OG, Altin D, Davies EJ, Aas M, Nordtug T. Interaction between microalgae, marine snow and anionic polyacrylamide APAM at marine conditions. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 705:135950. [PMID: 31841929 DOI: 10.1016/j.scitotenv.2019.135950] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Revised: 11/21/2019] [Accepted: 12/03/2019] [Indexed: 06/10/2023]
Abstract
When an oil field ages and the pressure in the reservoir decreases, or for oil fields with heavy oil, there may be a need for enhanced oil recovery (EOR) technologies. Polymer injection is a water-based EOR method where the viscosity of the water injected for pressure support is increased by mixing with a high concentration polymer solution. In this project, the potential fate of a synthetic anionic polyacrylamide (APAM) in seawater was investigated, since these EOR polymers may enter the marine environment with the produced water (PW). The main objective of the study was to determine if the APAM will interact with cells or aggregates (marine snow) of microalgae, resulting in potential polymer transport from the euphotic zone to the seabed. Three different species of microalgae with different degree of autotrophy (autotroph, mixotroph and heterotroph) were exposed to fluorescence-tagged APAM. Attachment to algal cells or aggregates formed by active or heat-inactivated algae were analysed by fluorescence microscopy and fluorometry. Our results suggested that attachment of APAM to cells of the algal species included in his study was negligible. A carousel system with natural seawater (SW) was used for formation of algal aggregates, one of the key components of marine snow. When aggregates of the diatom Thalassiosira rotula were formed in the presence of the fluorescence-tagged APAM, and at SW temperatures relevant for the Norwegian Continental Shelf, the polymer was nearly exclusively measured in the water phase after separation from the aggregates. The aggregate measurements therefore confirmed the results from the attachment studies, and we found no evidence of accumulation of APAM in aggregates formed from algae. Marine snow from algae is therefore not expected to significantly contribute to sedimentation of APAM dissolved in the water column.
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Affiliation(s)
| | | | | | - Marianne Aas
- SINTEF Ocean AS, Environment and New Resources, Trondheim, Norway
| | - Trond Nordtug
- SINTEF Ocean AS, Environment and New Resources, Trondheim, Norway
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Marín P, Martirani‐Von Abercron SM, Urbina L, Pacheco‐Sánchez D, Castañeda‐Cataña MA, Retegi A, Eceiza A, Marqués S. Bacterial nanocellulose production from naphthalene. Microb Biotechnol 2019; 12:662-676. [PMID: 31087504 PMCID: PMC6559018 DOI: 10.1111/1751-7915.13399] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Revised: 02/18/2019] [Accepted: 02/21/2019] [Indexed: 11/29/2022] Open
Abstract
Polycyclic aromatic compounds (PAHs) are toxic compounds that are released in the environment as a consequence of industrial activities. The restoration of PAH-polluted sites considers the use of bacteria capable of degrading aromatic compounds to carbon dioxide and water. Here we characterize a new Xanthobacteraceae strain, Starkeya sp. strain N1B, previously isolated during enrichment under microaerophilic conditions, which is capable of using naphthalene crystals as the sole carbon source. The strain produced a structured biofilm when grown on naphthalene crystals, which had the shape of a half-sphere organized over the crystal. Scanning electron microscopy (SEM) and GC-MS analysis indicated that the biofilm was essentially made of cellulose, composed of several micron-long nanofibrils of 60 nm diameter. A cellulosic biofilm was also formed when the cells grew with glucose as the carbon source. Fourier transformed infrared spectroscopy (FTIR) confirmed that the polymer was type I cellulose in both cases, although the crystallinity of the material greatly depended on the carbon source used for growth. Using genome mining and mutant analysis, we identified the genetic complements required for the transformation of naphthalene into cellulose, which seemed to have been successively acquired through horizontal gene transfer. The capacity to develop the biofilm around the crystal was found to be dispensable for growth when naphthalene was used as the carbon source, suggesting that the function of this structure is more intricate than initially thought. This is the first example of the use of toxic aromatic hydrocarbons as the carbon source for bacterial cellulose production. Application of this capacity would allow the remediation of a PAH into such a value-added polymer with multiple biotechnological usages.
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Affiliation(s)
- Patricia Marín
- Estación Experimental del ZaidínDepartment of Environmental ProtectionConsejo Superior de Investigaciones CientíficasCalle Profesor Albareda, 1Granada18008Spain
| | - Sophie Marie Martirani‐Von Abercron
- Estación Experimental del ZaidínDepartment of Environmental ProtectionConsejo Superior de Investigaciones CientíficasCalle Profesor Albareda, 1Granada18008Spain
| | - Leire Urbina
- Materials + Technologies Research Group (GMT)Department of Chemical and Environmental EngineeringFaculty of Engineering of GipuzkoaUniversity of the Basque CountryPza Europa 1Donostia‐San Sebastian20018Spain
| | - Daniel Pacheco‐Sánchez
- Estación Experimental del ZaidínDepartment of Environmental ProtectionConsejo Superior de Investigaciones CientíficasCalle Profesor Albareda, 1Granada18008Spain
| | - Mayra Alejandra Castañeda‐Cataña
- Estación Experimental del ZaidínDepartment of Environmental ProtectionConsejo Superior de Investigaciones CientíficasCalle Profesor Albareda, 1Granada18008Spain
| | - Aloña Retegi
- Materials + Technologies Research Group (GMT)Department of Chemical and Environmental EngineeringFaculty of Engineering of GipuzkoaUniversity of the Basque CountryPza Europa 1Donostia‐San Sebastian20018Spain
| | - Arantxa Eceiza
- Materials + Technologies Research Group (GMT)Department of Chemical and Environmental EngineeringFaculty of Engineering of GipuzkoaUniversity of the Basque CountryPza Europa 1Donostia‐San Sebastian20018Spain
| | - Silvia Marqués
- Estación Experimental del ZaidínDepartment of Environmental ProtectionConsejo Superior de Investigaciones CientíficasCalle Profesor Albareda, 1Granada18008Spain
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