Effects of the Headspace Gas Composition on Anaerobic Biotransformation ofo-,m-, andp-Toluic Acid in Sediment Slurries

Liu, Shiu‐Mei; Chi, Wei-Chiung

doi:10.1081/ese-120019867

Cited by 3 publications

(1 citation statement)

References 35 publications

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“…16 guidelines: Adsorption using batch equilibrium method [15], the soils should be characterized by these parameters considered to be largely responsible for the sportive capacity: organic carbon, clay content and soil texture, and pH. These parameters were analyzed using instruments or apparatus conducted on synthetic and Sembrong sediment [16][17][18][19]. Among the tests involved are shown as shown in Table 1.…”

Section: The Ph Clay Content Soil Texture and Mineral Composition Ana...mentioning

confidence: 99%

Adsorption Isotherms of Dimethyl Phthalate (DMP), DiEthyl Phthalate (DEP), Dibutyl Phthlate (DBP) and Benzyl Butyl Phthalate (BBP) Compounds in Synthetic and Sembrong River Sediment

Rapok

Karim

Hashim

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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Concentrations of Dimethyl Phthalate (DMP), Diethyl Phthalate (DEP), Dibutyl Phthlate (DBP), and Benzyl Butyl Phthalate (BBP) analysis proved present in Sembrong river sediment. These findings occurred during a certain extent of time depending on the properties of sediment and phthalates esters compound. Therefore, adsorption isotherm conducted using optimization method using manipulating variables of initial concentrations and contact times. The results analysis showed higher percentage adsorption recorded in DMP, DEP, DBP and BBP compounds by synthetic sediment which is 88.3%,89.6%,89.0% and 94.8% whereas river sediment is 87.4%,88.4%, 87.1% and 93.4%. The contributing factors aided in the adsorption of PAEs onto synthetic sediment are higher organic content (OC), smaller particle size having larger surface area and higher molecular weight of PAEs. Competitive adsorption occurred between DMP, DEP and DBP as they are low molecular weight compounds. Adsorption isotherms models by Langmuir and Freundlich isotherms models showed separation factor, RL values are favourable from 0.11 to 0.69. Good statistical fit R2 ranged from 0.97 to 0.99 of a good fit. Therefore, in conclusion, Sembrong river sediment is an adsorbent sediment storage of PAEs compounds.

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Section: The Ph Clay Content Soil Texture and Mineral Composition Ana...mentioning

confidence: 99%

Adsorption Isotherms of Dimethyl Phthalate (DMP), DiEthyl Phthalate (DEP), Dibutyl Phthlate (DBP) and Benzyl Butyl Phthalate (BBP) Compounds in Synthetic and Sembrong River Sediment

Rapok

Karim

Hashim

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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Chemical Behavior of Phthalates Under Abiotic Conditions in Landfills

Huang

Nkrumah

et al. 2012

Reviews of Environmental Contamination and Toxicology

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The phthalates comprise a family of phthalic acid esters that are used primarily as plasticizers in polymeric materials to impart flexibility during the manufacturing process and to the end product. It is estimated that the annual worldwide production of phthalate esters exceeds five million tons. Plasticizers are one of the most prominent classes of chemicals, but unfortunately, they possess endocrine-disrupting chemical properties. As endocrine-disrupting chemicals, plasticizers have produced adverse developmental and reproductive effects in mammalian animal models.Phthalates are easily transported into the environment during manufacture, disposal,and leaching from plastic materials, because they are not covalently bound to the plastics of which they are a component. Because of their fugitive nature and widespread use, the phthalates are commonly detected in air, water, sediment/soil, and biota, including human tissue. Large amounts of phthalic acid esters are often leached from the plastics that are dumped at municipal landfills.Phthalate esters undergo chemical changes when released into the environment.The primary processes by which they are transformed include hydrolysis, photolysis,and biodegradation. It is noteworthy that all of these degradation processes are greatly influenced by the local physical and chemical conditions. Hence, in the present review, we have sought to ascertain from the literature how the phthalate esters undergo transformation when they are released into lower landfill layers.Within the upper landfill layers, biodegradation prevails as the major degradation mechanism by which the phthalates are dissipated. Generally, biodegradation pathways for the phthalates consist of primary biodegradation from phthalate diesters to phthalate monoesters, then to phthalic acid, and ultimately biodegradation of phthalic acid to form C02 and/or CH4• We have noted that the phthalate esters are also degraded through abiotic means,which proceeds via both hydrolysis and photolysis. Photodegradation generally involves reactions of the phthalates in the atmosphere with hydroxyl radicals. The hydrolysis of phthalate diesters produces the corresponding monoesters, which are subsequently converted to phthalic acid. Phthalic acid has been observed to accumulate within landfill zones where phthalate contamination exists.Hydrolysis is usually not an important fate process for phthalate esters in the environment, including in upper landfill layers. However, the conditions prevalent at lower landfill layers are generally suitable for phthalate transformation via hydrolysis.The conditions in this zone include high temperatures and pressures, presence of chemical catalysts, as well as wide pH fluctuations. Such conditions foster hydrolysis that may be either acid- or base-catalyzed by metal ions, anions, or organic materials catalysts. In addition, research indicates that the propensity for ongoing hydrolysis increases as landfill depth increases.We can be emphatic in asserting that hydrolysis of phthalate esters in...

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Leaching of phthalate esters from different drinking stuffs and their subsequent biodegradation

Surhio

Talpur

Nizamani

et al. 2017

Environ Sci Pollut Res

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Phthalate esters (PAEs) are mainly used as plasticizers, and their release in the environment during the manufacturing, use, and disposal has caused serious environmental health concerns, since some of them are suspected to be mutagens, hepatotoxic agents, and carcinogens. In the present study, leaching of PAEs from different drinking stuffs (water cooler, mineral water bottles) exposed to sunlight and baby feeders subjected to different heating treatments (boiling, autoclave and oven) was studied. Results showed that a total of 10 PAEs were leached and identified. Among them, dimethyl phthalate, bis(2-methoxyethyl) phthalate, diethyl phthalate, and dibutyl phthalate were the major leached PAEs found in the range 9-112.50 μg L. Boiling treatment was found safer for baby feeders as PAE leaching was ~26-54% less as compared to other two treatments. The leached PAEs in water samples were then subjected to biodegradation experiment with Bacillus thuringiensis strain at optimized conditions (time 72 h and 30 °C). Hence, leaching of hazardous PAEs from different water stuffs is alarming and needs immediate attention. Moreover, B. thuringiensis strain was found effective for PAE remediation (75-96% degradation) at neutral pH. Graphical abstract ᅟ.

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Effects of the Headspace Gas Composition on Anaerobic Biotransformation ofo-,m-, andp-Toluic Acid in Sediment Slurries

Cited by 3 publications

References 35 publications

Adsorption Isotherms of Dimethyl Phthalate (DMP), DiEthyl Phthalate (DEP), Dibutyl Phthlate (DBP) and Benzyl Butyl Phthalate (BBP) Compounds in Synthetic and Sembrong River Sediment

Adsorption Isotherms of Dimethyl Phthalate (DMP), DiEthyl Phthalate (DEP), Dibutyl Phthlate (DBP) and Benzyl Butyl Phthalate (BBP) Compounds in Synthetic and Sembrong River Sediment

Chemical Behavior of Phthalates Under Abiotic Conditions in Landfills

Leaching of phthalate esters from different drinking stuffs and their subsequent biodegradation

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