Sunlight-induced transformation of sulfadiazine and sulfamethoxazole in surface waters and wastewater effluents

Bahnmüller, Sabrina; Gunten, Urs von; Canonica, Silvio

doi:10.1016/j.watres.2014.03.019

Cited by 136 publications

(94 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The comparably large variations for sulfamethoxazole may be attributed to low initial concentrations and analytical imprecisions. For instance, photolytic transformation and back-transformation from human metabolites has been reported (Bonvin et al, 2012;Bahnmuller et al, 2014). Similar removals with all dosing combinations were also observed for other OMPs, such as non-pharmaceuticals benzotriazole and iomeprol (Fig.…”

Section: Micropollutantssupporting

confidence: 76%

Impacts of coagulation on the adsorption of organic micropollutants onto powdered activated carbon in treated domestic wastewater

et al. 2015

View full text Add to dashboard Cite

Section: Micropollutantssupporting

confidence: 76%

Impacts of coagulation on the adsorption of organic micropollutants onto powdered activated carbon in treated domestic wastewater

et al. 2015

View full text Add to dashboard Cite

“…15 For SD, almost the same slope parameter value was obtained as for SMX, confirming the similarity in the photochemical behavior of these two sulfonamides that has been recently described elsewhere. 29 The ordinate intercepts of the regression lines in Figure 2a are generally below the value of 1 predicted by eq 4 and indicate a deviation of the experimental data from the simple model described above. It is possible that the deviation resulted from the presence of antioxidant moieties in the DOMs that contributed to the EDC (measured by MEO) but that were not reactive with triplet-induced transformation intermediates of SD and SMX.…”

Section: Environmental Science and Technologymentioning

confidence: 77%

Photosensitizing and Inhibitory Effects of Ozonated Dissolved Organic Matter on Triplet-Induced Contaminant Transformation

Wenk

Aeschbacher

Sander

et al. 2015

Environ. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

Dissolved organic matter (DOM) is both a promoter and an inhibitor of triplet-induced organic contaminant oxidation. This dual role was systematically investigated through photochemical experiments with three types of DOM of terrestrial and aquatic origins that were preoxidized to varying extents by ozonation. The inhibitory effect of DOM was assessed by determining the 4-carboxybenzophenone photosensitized transformation rate constants of two sulfonamide antibiotics (sulfamethoxazole and sulfadiazine) in the presence of untreated or preoxidized DOM. The inhibitory effect decreased with the increasing extent of DOM preoxidation, and it was correlated to the loss of phenolic antioxidant moieties, as quantified electrochemically, and to the loss of DOM ultraviolet absorbance. The triplet photosensitizing ability of preoxidized DOM was determined using the conversion of the probe compound 2,4,6-trimethylphenol (TMP), which is unaffected by DOM inhibition effects. The DOM photosensitized transformation rate constants of TMP decreased with increasing DOM preoxidation and were correlated to the concomitant loss of chromophores (i.e., photosensitizing moieties). The combined effects of DOM preoxidation on the inhibiting and photosensitizing properties were assessed by phototransformation experiments of the sulfonamides in DOM-containing solutions. At low extents of DOM preoxidation, the sulfonamide phototransformation rate constants remained either unchanged or slightly increased, indicating that the removal of antioxidant moieties had larger effects than the loss of photosensitizing moieties. At higher extents of DOM preoxidation, transformation rates declined, mainly reflecting the destruction of photosensitizing moieties.

show abstract

“…9,10,13,37,[45][46][47] Furthermore, we sought to examine whether apparent quantum yields of 1 O 2 and triplet OM vary in similar ways with OM source in order to verify the assumption that triplet OM is the precursor to 1 O 2 35,36 and to examine whether probes for the two species provide consistent information on the production of triplet state photochemistry. Finally, we evaluated the relationships of the respective quantum yields to OM properties, including E 2 /E 3 ratios and OM isolate electron-donating and accepting capacities, to assess whether previously reported relationships for DOM also applied to EfOM and natural waters receiving treated wastewater effluent discharges.…”

Section: Introductionmentioning

confidence: 99%

Triplet Photochemistry of Effluent and Natural Organic Matter in Whole Water and Isolates from Effluent-Receiving Rivers

Bodhipaksha

Sharpless

Chin

et al. 2015

Environ. Sci. Technol.

142

133

View full text Add to dashboard Cite

Effluent organic matter (EfOM), contained in treated municipal wastewater, differs in composition from naturally occurring dissolved organic matter (DOM). The presence of EfOM may thus alter the photochemical production of reactive intermediates in rivers that receive measurable contributions of treated municipal wastewater. Quantum yield coefficients for excited triplet-state OM (3OM*) and apparent quantum yields for singlet oxygen (1O2) were measured for both whole water samples and OM isolated by solid phase extraction from whole water samples collected upstream and downstream of municipal wastewater treatment plant discharges in three rivers receiving differing effluent contributions: Hockanum R., CT (22% (v/v) effluent flow), E. Fork Little Miami R., OH (11%), and Pomperaug R., CT (6%). While only small differences in production of these reactive intermediates were observed between upstream and downstream whole water samples collected from the same river, yields of 3OM* and 1O2 varied by 30-50% between the rivers. Apparent quantum yields of 1O2 followed similar trends to those of 3OM*, consistent with 3OM* as a precursor to 1O2 formation. Higher 3OM* reactivity was observed for whole water samples than for OM isolates of the same water, suggesting differential recoveries of photoreactive moieties by solid phase extraction. 3OM* and 1O2 yields increased with increasing E2/E3 ratio (A254 nm divided by A365 nm) and decreased with increasing electron donating capacities of the samples, thus exhibiting trends also observed for reference humic and fulvic acid isolates. Mixing experiments with EfOM and DOM isolates showed evidence of quenching of triplet DOM by EfOM when measured yields were compared to theoretical yields. Together, the results suggest that effluent contributions of up to 25% (v/v) to river systems have a negligible influence on photochemical production of 3OM* and 1O2 apparently because of quenching of triplet DOM by EfOM. Furthermore, the results highlight the importance of whole water studies for quantifying in situ photoreactivity, particularly for 3OM*.

show abstract

Sunlight-induced transformation of sulfadiazine and sulfamethoxazole in surface waters and wastewater effluents

Cited by 136 publications

References 38 publications

Impacts of coagulation on the adsorption of organic micropollutants onto powdered activated carbon in treated domestic wastewater

Impacts of coagulation on the adsorption of organic micropollutants onto powdered activated carbon in treated domestic wastewater

Photosensitizing and Inhibitory Effects of Ozonated Dissolved Organic Matter on Triplet-Induced Contaminant Transformation

Triplet Photochemistry of Effluent and Natural Organic Matter in Whole Water and Isolates from Effluent-Receiving Rivers

Contact Info

Product

Resources

About