Photocatalytic transformation of acesulfame: Transformation products identification and embryotoxicity study

Li, Adela Jing; Schmitz, Oliver J.; Stephan, Susanne; Lenzen, Claudia; Yue, Patrick Ying-Kit; Li, Kaibin; Li, Huashou; Leung, Kelvin Sze-Yin

doi:10.1016/j.watres.2015.11.035

Cited by 64 publications

(32 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, once again, the presence of artificial sweeteners indicates a wastewater influence, and therefore, even if artificial sweeteners themselves are not a significant threat to the aquatic fauna, other compounds that are associated with wastewater might pose a threat and thus warrant further investigation. Furthermore, there is evidence that the breakdown products of artificial sweeteners might have ecotoxilogical implications (Sang et al, 2014; Li et al, 2016). …”

Section: Resultsmentioning

confidence: 99%

“…However, ACE has been shown to be resistant to degradation in water and wastewater treatment plants, surface waters, and groundwater (Buerge et al, 2009; Scheurer et al, 2009; Robertson et al, 2013) and is subsequently very persistent in the environment. Acesulfame can be broken down by dissolved ozone (Scheurer et al, 2010, 2012), ultraviolet light (Sang et al, 2014; Scheurer et al, 2014; Li et al, 2016), and natural sunlight (Gan et al, 2014); however, these mechanism are not relevant to groundwater flow systems. A study using columns of saturated sandy soil has also shown that adsorption of artificial sweeteners (ACE, CYC, SAC) in sandy aquifers is likely negligible (Foolad et al, 2015).…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Artificial Sweeteners Reveal Septic System Effluent in Rural Groundwater

2017

View full text Add to dashboard Cite

It has been widely documented that municipal wastewater treatment plant effluents are a major source of artificial sweeteners to surface waters. However, in rural areas, the extent to which septic systems contribute these same compounds to groundwater aquifers is largely unknown. We examined the occurrence of four commonly used artificial sweeteners in an unconfined sand aquifer that serves as a water supply for rural residents, as a receptor of domestic wastewater from septic systems, and as a source of baseflow to the Nottawasaga River, ON, Canada. Groundwater from the Lake Algonquin Sand Aquifer in the southern Nottawasaga River Watershed was collected from private domestic wells and as groundwater seeps discharging along the banks of the Nottawasaga River. Approximately 30% of samples had detectable levels of one or more artificial sweeteners, indicating the presence of water derived from septic system effluent. Using acesulfame concentrations to estimate the fraction of septic effluent in groundwater samples, ∼3.4 to 13.6% of the domestic wells had 1% or more of their well water being derived from septic system effluent. Similarly, 2.0 to 4.7% of the groundwater seeps had a septic effluent contribution of 1% or more. No relationship was found between the concentration of acesulfame and the concentration of nitrate, ammonium, or soluble reactive phosphorus in the groundwater, indicating that septic effluent is not the dominant source of nutrients in the aquifer. It is expected that the occurrence of artificial sweeteners in shallow groundwater is widespread throughout rural areas in Canada. Core Ideas Samples were collected from domestic wells and groundwater seeps in rural Ontario. Artificial sweeteners were found in >30% of rural groundwater samples. Acesulfame was used to estimate the fraction of septic effluent in groundwater. Septic effluent was not a significant source of nutrients in the aquifer.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Artificial Sweeteners Reveal Septic System Effluent in Rural Groundwater

2017

View full text Add to dashboard Cite

show abstract

“…Municipal wastewater effluents are the main entrance pathway of ASs in the aquatic environment and among them, saccharin (SAC), acesulfame (ACE) and sucralose (SUC) are widely detected, at trace level concentrations, in groundwater, surface and drinking water . The lack of knowledge of ASs' long‐term ecotoxicological effects and their reported formation of toxic by‐products during natural attenuation, raise some important environmental concerns and further call for the development of highly efficient treatment methods.…”

Section: Introductionmentioning

confidence: 99%

“…2,3 Municipal wastewater effluents are the main entrance pathway of ASs in the aquatic environment and among them, saccharin (SAC), acesulfame (ACE) and sucralose (SUC) are widely detected, at trace level concentrations, in groundwater, surface and drinking water. 1,[4][5][6][7] The lack of knowledge of ASs' long-term ecotoxicological effects and their reported formation of toxic by-products during natural attenuation, raise some important environmental concerns 5,8 and further call for the development of highly efficient treatment methods. TiO 2 -mediated photocatalysis, an advanced oxidation process with well-proven efficiency in degrading recalcitrant, non-biodegradable compounds, 9,10 has recently been studied for the degradation of SUC, ACE and SAC and the results obtained are encouraging.…”

Section: Introductionmentioning

confidence: 99%

“…TiO 2 -mediated photocatalysis, an advanced oxidation process with well-proven efficiency in degrading recalcitrant, non-biodegradable compounds, 9,10 has recently been studied for the degradation of SUC, ACE and SAC and the results obtained are encouraging. 8,11,12 In principle, photocatalytic oxidation is initiated upon UV illumination of TiO 2 ; highly reactive species, mainly hydroxyl radicals (HO • ), are then formed and non-selectively attack organic pollutants, which are subsequently mineralized into CO 2 and harmless inorganic products. 13,14 Blacklight (BL) fluorescent UV lamps are commonly used as irradiation source in photocatalytic applications.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Photocatalytic degradation of saccharin under UV‐LED and blacklight irradiation

Davididou

McRitchie

Αντωνοπούλου

et al. 2017

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

show abstract

A Review of the Environmental Fate and Effects of Acesulfame‐Potassium

Belton¹,

Schaefer

Guiney³

2020

Integr Envir Assess & Manag

View full text Add to dashboard Cite

The use of low and no calorie sweeteners (LNCSs) has increased substantially the past several decades. Their high solubility in water, low absorption to soils, and reliable analytical methods facilitate their detection in wastewater and surface waters. Low and no calorie sweeteners are widely used in food and beverage products around the world, have been approved as food additives, and are considered safe for human consumption by the United States Food and Drug Administration (USFDA) and other regulatory authorities. Concerns have been raised, however, regarding their growing presence and potential aquatic toxicity. Recent studies have provided new empirical environmental monitoring, environmental fate, and ecotoxicity on acesulfame potassium (ACE‐K). Acesulfame potassium is an important high‐production LNCS, widely detected in the environment and generally reported to be environmentally persistent. Acesulfame‐potassium was selected for this environmental fate and effects review to determine its comparative risk to aquatic organisms. The biodegradation of ACE‐K is predicted to be low, based on available quantitative structure–activity relationship (QSAR) models, and this has been confirmed by several investigations, mostly published prior to 2014. More recently, there appears to be an interesting paradigm shift with several reports of the enhanced ability of wastewater treatment plants to biodegrade ACE‐K. Some studies report that ACE‐K can be photodegraded into potentially toxic breakdown products, whereas other data indicate that this may not be the case. A robust set of acute and chronic ecotoxicity studies in fish, invertebrates, and freshwater plants provided critical data on ACE‐K's aquatic toxicity. Acesulfame‐potassium concentrations in wastewater and surface water are generally in the lower parts per billion (ppb) range, whereas concentrations in sludge and groundwater are much lower (parts per trillion [ppt]). This preliminary environmental risk assessment establishes that ACE‐K has high margins of safety (MOSs) and presents a negligible risk to the aquatic environment based on a collation of extensive ACE‐K environmental monitoring, conservative predicted environmental concentration (PEC) and predicted no‐effect concentration (PNEC) estimates, and prudent probabilistic exposure modeling. Integr Environ Assess Manag 2020;16:421–437. © 2020 The Authors. Integrated Environmental Assessment and Management published by Wiley Periodicals, Inc. on behalf of Society of Environmental Toxicology & Chemistry (SETAC)

show abstract

Photocatalytic transformation of acesulfame: Transformation products identification and embryotoxicity study

Cited by 64 publications

References 40 publications

Artificial Sweeteners Reveal Septic System Effluent in Rural Groundwater

Artificial Sweeteners Reveal Septic System Effluent in Rural Groundwater

Photocatalytic degradation of saccharin under UV‐LED and blacklight irradiation

A Review of the Environmental Fate and Effects of Acesulfame‐Potassium

Contact Info

Product

Resources

About