Distribution Coefficient and Adsorption–desorption Rates of di (2-ethylhexyl) Phthalate (DEHP) onto and from the Surface of Suspended Particles in Fresh Water

Sirivithayapakorn, Sanya; Limtrakul, Sunun

doi:10.1007/s11270-007-9578-7

Cited by 11 publications

(6 citation statements)

References 45 publications

(59 reference statements)

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“…6 reveal that DEHP desorption from biofilms was a very fast process during the initial period, but it needed a long time to reach the DEHP equilibrium between biofilms and wastewater at 4°C. Similar results are also found in DEHP adsorption by both pure bentonite and natural suspended particles (Sirivithayapakorn and Limtrakul, 2008). Our results lead us to conclude that there was a dynamic balance of DEHP between biofilms and wastewater.…”

Section: Desorptionsupporting

confidence: 88%

Adsorption Kinetics and Equilibrium Studies of an Endocrine Disruptor, Di-(2-ethylhexyl) Phthalate, from Wastewater by Biofilms

CaoXiangsheng

LiXiuqiang

MengXuezheng

2014

Environmental Engineering Science

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An endocrine disrupting chemical, di-(2-ethylhexyl) phthalate (DEHP), can be removed from wastewater by biological aerated filters, but the removal mechanism is not clear. This original study focused on the adsorption isotherm and kinetics of DEHP on biofilms from a biological aerated filter at 4°C. This low temperature was selected to reduce interactions between the biological metabolism and adsorption as much as possible. The experimental data at 4°C fit with the Langmuir and Freundlich isotherm models. R 2 for the Langmuir and Freundlich isotherm is 0.969 and 0.949, respectively. For the Langmuir isotherm, q max (Langmuir adsorption capacity) is 161.55 lg/g and k L (Langmuir constant) is 0.186L/lg. For the Freundlich isotherm, n (Freundlich constant) is 1.68 and k (Freundlich adsorption capacity) is 29.46 lg/g. The adsorption capacity of 1g biofilm for DEHP is 34.67 lg as calculated from pseudo-second-order kinetics, which corresponds well with adsorption rate data. There was a dynamic balance of DEHP concentration between biofilms and wastewater. Without biological activity, DEHP would migrate from the biofilms back into the wastewater if the concentration of DEHP in biofilms becomes higher than that in the wastewater. These results are fundamental to understand DEHP removal mechanisms in a biological aerated filter.

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Section: Desorptionsupporting

confidence: 88%

Adsorption Kinetics and Equilibrium Studies of an Endocrine Disruptor, Di-(2-ethylhexyl) Phthalate, from Wastewater by Biofilms

CaoXiangsheng

LiXiuqiang

MengXuezheng

2014

Environmental Engineering Science

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“…Moreover, these imply that these contaminants might have the same sources. Owing to the physical and chemical properties of PAEs, namely low-water solubility, high organic carbon–water partition coefficients (Koc) and hydrophobicity, PAEs tend to adsorb onto suspended particles and eventually accumulate in the sediment as particles settle out of solution [ 38 ].…”

Section: Resultsmentioning

confidence: 99%

Deterministic Assessment of the Risk of Phthalate Esters in Sediments of U-Tapao Canal, Southern Thailand

Okpara

Witthayawirasak

2020

Toxics

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This baseline study evaluated the ecological risk associated with the concentration of six common Phthalate esters (PAEs) in sediment samples collected from the U-Tapao canal in Southern Thailand. Deterministic approaches consisting of standard sediment quality guidelines (SQGs) and Risk quotient (RQ) were used to evaluate the potential ecological risk of individuals and a mixture of Phthalate esters (PAEs) detected in sediment samples. Of the 6 PAEs measured, only three, including di-n-butyl phthalate (DBP), di-2-ethyl hexyl phthalate (DEHP) and di-isononyl phthalate (DiNP), were identified and quantified. The total concentration of the 3 PAEs congeners found in the sediment samples ranged from 190 to 2010 ng/g dw. The results from the SQGs and RQ were not consistent with each other. The SQGs results for individual PAEs showed that DEHP and DBP found in sediment was estimated to cause moderate risk on benthic organisms, DiNP was not estimated due to lack of SQGs data. However, the RQ method indicated a low risk of DEHP and DBP on algae, crustacean and fish, whereas DiNP poses no risk on crustacean. Furthermore, based on the result obtained in this study, the consensus SQGs for mixture effects prove to be a more protective tool than the RQ concentration addition approach in predicting mixture effects. Despite inevitable uncertainties, the integration of several screening approaches of ecological risk assessment (ERA) can help get a more inclusive and credible result of the first tier of individuals and a mixture of these pollutants.

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“…1A). DEHP releases into the environment through dissolution and volatilization processes during transportation, storage and production (Magdouli et al, 2013;Sirivithayapakorn and Limtrakul, 2008). The potential release of DEHP may attributes to its applications in PPCPs, paints, medical devices and laboratory equipment (Chen et al, 2008;Franco et al, 2011;Koniecki et al, 2011).…”

Section: Sources Of Dehp Pahs and Ppcpsmentioning

confidence: 99%

Environmental Concerns and Toxicogenetic Endpoints of Priority Substances (PSs) and Contaminants of Emerging Concerns (CECs): A Comprehensive Review

Liu¹,

Junaid²,

Hamid³

et al. 2018

American Journal of Environmental Sciences

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Priority Substance (PSs) and Contaminant of Emerging Concerns (CECs) exhibited a wide range of environmental and public health concerns worldwide. This review summarized the documented studies related to the current surface water occurrence, spatial distribution, ecological risks and toxicity of selected PSs, such as polycyclic aromatic hydrocarbons (PAHs) and CECs, such as Di(2-Ethylhexyl) Phthalate (DEHP) and Pharmaceuticals and Personal Care Products (PPCPs). The spatial distribution analysis revealed alarming levels of PAHs in the surface waters of Asian counties, e.g., 84210 ng L −1 in Gomti River, India, 29325 ng L −1 in Daya Bay, China and 1287 ng L −1 in Chenab River, Pakistan. As for DEHP, the highest concentrations of 13050 µg L −1 in Liao River, China, and 2306 µg L −1 in Rivers of Eastern Cape, South Africa were reported. These environmental levels of PAHs and DEHP were many folds higher than the surface water permissible levels devised by WHO and USEPA. Contrarily, the emerging PPCPs were reported in relatively lower levels in the surface waters globally, compared to that of PAHs and DEHP. Consistent with the environmental levels, PAHs and DEHP revealed alarming ecological risks in the surface water sources, compared to that of PPCPs. Regarding to the sources of PSs and CECs, PAHs emissions were mostly linked to the incomplete combustion of petroleum products, DEHP contamination was associated to its applications in consumption and production of plastic appliances and PPCPs emissions were largely related to the domestic and industrial effluents. As for toxic endpoints of PAHs, DEHP and PPCPs, all of these were reported to cause DNA damage, genotoxicity, reproductive toxicity, developmental toxicity and immunotoxicity, as revealed in reviewed in vitro/vivo studies. In addition, the current review also highlighted the existing environmental regulations to control the emissions of these pollutants to the environmental matrices. Taken together, this review concluded that despite the existing environmental regulations, the current levels of organic pollutants are still on rising, especially in Asian countries. Therefore, the strict implementation of the existing regulations is highly necessary to control these pollutants to ensure public health and ecological integrity.

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Distribution Coefficient and Adsorption–desorption Rates of di (2-ethylhexyl) Phthalate (DEHP) onto and from the Surface of Suspended Particles in Fresh Water

Cited by 11 publications

References 45 publications

Adsorption Kinetics and Equilibrium Studies of an Endocrine Disruptor, Di-(2-ethylhexyl) Phthalate, from Wastewater by Biofilms

Adsorption Kinetics and Equilibrium Studies of an Endocrine Disruptor, Di-(2-ethylhexyl) Phthalate, from Wastewater by Biofilms

Deterministic Assessment of the Risk of Phthalate Esters in Sediments of U-Tapao Canal, Southern Thailand

Environmental Concerns and Toxicogenetic Endpoints of Priority Substances (PSs) and Contaminants of Emerging Concerns (CECs): A Comprehensive Review

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