Chlorination and bromination of 1,3-diphenylguanidine and 1,3-di-o-tolylguanidine: Kinetics, transformation products and toxicity assessment

Sieira, Benigno José; Montes, Rosa; Touffet, Arnaud; Rodil, Rosario; Cela, Rafael; Gallard, Hervé; Quintana, José Benito

doi:10.1016/j.jhazmat.2019.121590

Cited by 43 publications

(30 citation statements)

References 24 publications

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“…Increasing the current intensity from 0.05 A to 0.15 A resulted in an increase in the N TOT removal rate. This achievement can be explained by considering a faster production of hydroxyl radicals and reactive chlorine species, as stated in several previous studies on electrochemical oxidation processes [ 77 ], which favor the oxidation of the organic compounds, i.e., the achievement of higher removal efficiencies. On the other hand, over time of treatment, the reactive chlorine species present in the solution can lead to the formation of undesired byproducts, such as chlorate and perchlorate, among others, which may hinder further oxidation of the contaminant at the BDD anode [ 62 , 63 , 64 ], justifying the constant removal efficiency after 90 min.…”

Section: Resultsmentioning

confidence: 93%

Electrochemical Removal of Nitrogen Compounds from a Simulated Saline Wastewater

et al. 2023

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In the last few years, many industrial sectors have generated and discharged large volumes of saline wastewater into the environment. In the present work, the electrochemical removal of nitrogen compounds from synthetic saline wastewater was investigated through a lab-scale experimental reactor. Experiments were carried out to examine the impacts of the operational parameters, such as electrolyte composition and concentration, applied current intensity, and initial ammoniacal nitrogen concentration, on the total nitrogen removal efficiency. Using NaCl as an electrolyte, the NTOT removal was higher than Na2SO4 and NaClO4; however, increasing the initial NaCl concentration over 250 mg·L−1 resulted in no benefits for the NTOT removal efficiency. A rise in the current intensity from 0.05 A to 0.15 A resulted in an improvement in NTOT removal. Nevertheless, a further increase to 0.25 A led to basically no enhancement of the efficiency. A lower initial ammoniacal nitrogen concentration resulted in higher removal efficiency. The highest NTOT removal (about 75%) was achieved after 90 min of treatment operating with a NaCl concentration of 250 mg·L−1 at an applied current intensity of 0.15 A and with an initial ammoniacal nitrogen concentration of 13 mg·L−1. The nitrogen degradation mechanism proposed assumes a series–parallel reaction system, with a first step in which NH4+ is in equilibrium with NH3. Moreover, the nitrogen molar balance showed that the main product of nitrogen oxidation was N2, but NO3− was also detected. Collectively, electrochemical treatment is a promising approach for the removal of nitrogen compounds from impacted saline wastewater.

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Section: Resultsmentioning

confidence: 93%

Electrochemical Removal of Nitrogen Compounds from a Simulated Saline Wastewater

et al. 2023

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“…Much less is known about likely effects of these on duckweed. General toxicity of the transformation products of 1,3diphenylguanidine is expected across organisms (Sieira et al, 2020), and the same is true for benzothiazole, with documented toxicity across a number of other species, and potential similar mode of action as PAHs, due to activation of aryl hydrocarbon receptors (Liao et al, 2018). Bisphenol-A toxicity to duckweed and other Lemna is known (Mihaich et al, 2009;Fekete-Kertész et al, 2015), and like PAHs may increase growth at low concentrations (Mihaich et al, 2009).…”

Section: Microbiome Interactionsmentioning

confidence: 97%

A common contaminant shifts impacts of climate change on a plant-microbe mutualism: effects of temperature, CO₂and leachate from tire wear particles

O'Brien

Lins

Yang

et al. 2020

Preprint

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1Anthropogenic stressors, such as climate change or chemical pollution, affect indi-2 vidual species and alter species interactions. Moreover, species interactions can modify 3 effects of anthropogenic stressors on interacting species -a process which may vary 4 amongst stressors or stressor combinations. Most ecotoxicological work focuses on 5 single stressors on single species. Here, we test hypotheses about multiple stressors 6 (climate change and tire wear particles) and interacting species, and whether species 7 interactions modify responses. We use duckweed and its microbiome to model responses 8 of plant-microbe interactions. Climate change is occurring globally, and with increasing 9 urbanization, tire wear particles increasingly contaminate road runoff. Their leachate is 10 associated with zinc, PAHs, plastic additives, and other toxic compounds. We crossed 11 perpendicular gradients of temperature and CO 2 in a well plate with factorial manip-12 ulation of leachate from tire wear particles and presence of duckweed microbiomes. 13 We measured duckweed and microbial growth, duckweed greenness, and plant-microbe 14 growth correlations. We found that tire leachate and warmer temperatures enhanced 15 duckweed and microbial growth, but microbes diminished positive responses in duck-16 weed, meaning microbiomes became costly for duckweed. These costs of microbiomes 17 were less-than-additive with warming and leachate, and might be caused by leachate-18 disrupted endocrine signaling in duckweed. We observed reduced greenness at higher 19 CO 2 without tire leachate, suggesting a relative increase in plant nutrient demand, and 20 possibly underlying positive plant-microbe growth correlations in these conditions, as 21 microbes presumably increase nutrient availability. However, with tire leachate, growth 22 correlations were never positive, and shifted negative at lower CO 2 , further suggesting 23 leachate favors mutualism disruption. In summary, while individual stressors of global 24 change can affect individual species, in ecology we know species interact; and in ecotox-25 icology, we know stressors interact. Our results demonstrate this complexity: multiple 26 stressors can affect species interactions, and species interactions can alter effects of 27 multiple stressors. 28

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“…DPG was recently reported to occur in runoff water from roads [44,45], pointing to tire crumb rubber as a potential source of this compound in surface water. Although both DTG and DPG have been observed to be transformed by chlorination [46], or, in the case of DPG, also through solar radiation [5], their presence in the environment or ecotoxicological effects have scarcely been studied.…”

Section: Overview On the Most Frequently Detected Contaminantsmentioning

confidence: 99%

Screening of Contaminants of Emerging Concern in Surface Water and Wastewater Effluents, Assisted by the Persistency-Mobility-Toxicity Criteria

et al. 2022

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Contaminants of emerging concern (CECs) are compounds of diverse origins that have not been deeply studied in the past which are now accruing growing environmental interest. The NOR-Water project aimed to identify the main CECs and their sources in the water environment of Northern Portugal–Galicia (located in northwest Spain) transnational region. To achieve these goals, a suspect screening analytical methodology based on the use of liquid chromatography coupled to high resolution mass spectrometry (LC-HRMS) was applied to 29 sampling sites in two campaigns. These sampling sites included river and sea water, as well as treated wastewater. The screening was driven by a library of over 3500 compounds, which included 604 compounds prioritized from different relevant lists on the basis of the persistency, mobility, and toxicity criteria. Thus, a total of 343 chemicals could be tentatively identified in the analyzed samples. This list of 343 identified chemicals was submitted to the classification workflow used for prioritization and resulted in 153 chemicals tentatively classified as persistent, mobile, and toxic (PMT) and 23 as very persistent and very mobile (vMvP), pinpointing the relevance of these types of chemicals in the aqueous environment. Pharmaceuticals, such as the antidepressant venlafaxine or the antipsychotic sulpiride, and industrial chemicals, especially high production volume chemicals (HPVC) such as ε-caprolactam, were the groups of compounds that were detected at the highest frequencies.

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Chlorination and bromination of 1,3-diphenylguanidine and 1,3-di-o-tolylguanidine: Kinetics, transformation products and toxicity assessment

Cited by 43 publications

References 24 publications

Electrochemical Removal of Nitrogen Compounds from a Simulated Saline Wastewater

Electrochemical Removal of Nitrogen Compounds from a Simulated Saline Wastewater

A common contaminant shifts impacts of climate change on a plant-microbe mutualism: effects of temperature, CO₂and leachate from tire wear particles

Screening of Contaminants of Emerging Concern in Surface Water and Wastewater Effluents, Assisted by the Persistency-Mobility-Toxicity Criteria

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Chlorination and bromination of 1,3-diphenylguanidine and 1,3-di-o-tolylguanidine: Kinetics, transformation products and toxicity assessment

Cited by 43 publications

References 24 publications

Electrochemical Removal of Nitrogen Compounds from a Simulated Saline Wastewater

Electrochemical Removal of Nitrogen Compounds from a Simulated Saline Wastewater

A common contaminant shifts impacts of climate change on a plant-microbe mutualism: effects of temperature, CO2and leachate from tire wear particles

Screening of Contaminants of Emerging Concern in Surface Water and Wastewater Effluents, Assisted by the Persistency-Mobility-Toxicity Criteria

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Product

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A common contaminant shifts impacts of climate change on a plant-microbe mutualism: effects of temperature, CO₂and leachate from tire wear particles