Aqueous photochemical degradation of BDE-153 in solutions with natural dissolved organic matter

Wang, Huili; Wang, Mei; Wang, Hui; Gao, Jiajia; Dahlgren, Randy A.; Yu, Qing; Wang, Xuedong

doi:10.1016/j.chemosphere.2016.04.071

Cited by 10 publications

(2 citation statements)

References 46 publications

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“…It was found that 3 DOM* plays an important role in the photodegradation of e.g. acetaminophen (Li et al 2017), betablockers (Wang et al 2012) and BDE-153 (Wang et al 2016). Reaction of 3 DOM* with dissolved oxygen results in the formation of 1 O 2 (McNeill & Canonica 2016), and intramolecular electron transfer between electron donors and receptors inside 3 DOM* was shown to produce reducing radical intermediates, which further react with dissolved oxygen to yield superoxide anions (O 2˙À ) (Li et al 2017).…”

Section: Effect Of Oxygen On Photolysismentioning

confidence: 99%

UV/sulphite as alternative for UV/H2O2 for micropollutant degradation in drinking water

2021

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The UV/SO32– process can be applied to convert organic micropollutants (OMP). The reaction is induced by UV-photolysis of sulphitesulphite (preferably using a MP UV lamp). Although in general it is assumed that the UV/SO32− process is an advanced reduction process, our results show degradation of OMP under both anoxic and oxic conditions. Several recalcitrant OMP even show higher degradation rates under oxic conditions than under anoxic conditions. This conversion is affected by the presence of dissolved organic carbon (DOC), HCO3− and NO3−, and thus was more effective in drinking water than in Milli-Q water. The reaction rate constants of the oxic UV/SO32− process in general are lower than those of a UV/H2O2 process, but in cases were the use of H2O2 isn't preferred, the UV/SO32− process may be an interesting alternative.

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Section: Effect Of Oxygen On Photolysismentioning

confidence: 99%

UV/sulphite as alternative for UV/H2O2 for micropollutant degradation in drinking water

2021

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“…The preceding prediction assumes that the reaction is taking place in pure water. In more realistic treatment scenarios with water containing natural organic matter (NOM), some of the NOM may be photolyzed and produce reactive oxygen species that further contribute to the degradation of a target compound. − For example, Chintalapati and Mohseni report a higher pseudo-first-order reaction rate for microcystin-LR in the presence of 2 mg/L dissolved organic carbon (DOC) than in ultrapure water. At the same time, a natural water matrix may also impede the degradation of a target compound. , Thus, the photolysis of microcystin-LR in natural water may occur at a rate that is greater or less than the average rate determined in this review.…”

Section: Critical Assessment Of Studies Reporting Microcystin-lr Degr...mentioning

confidence: 99%

The Importance of Measuring Ultraviolet Fluence Accurately: A Review of Microcystin-LR Removal by Direct Photolysis

Almuhtaram

Wang

Hofmann

2021

Environ. Sci. Technol. Lett.

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Many ultraviolet (UV) experiments are conducted without ensuring that fluence is measured accurately, which may significantly affect the interpretation of the findings. This is especially evident for microcystin-LR, a common cyanobacterial toxin. Reports on the effectiveness of direct photolysis of microcystin-LR by 254 nm UV light are highly inconsistent in the literature, with pseudo-first-order rate coefficients reported from 10 −2 to 10 −5 cm 2 /mJ. It is demonstrated systematically that most of these studies did not follow proper fluence calculation procedures. The findings of improper studies were eliminated or, if possible, corrected using standard protocols. After accounting for these deficiencies, we find the average rate coefficient is 3.1 ± 0.82 × 10 −3 cm 2 /mJ and is used to determine a new quantum yield at 254 nm (0.048 mol/Einstein). These findings are used to recharacterize the photolysis of microcystin-LR whereby it is shown that in ultrapure water 84% of the microcystin-LR can be transformed into nontoxic products by a fluence of 600 mJ/cm 2 , typical of UV advanced oxidation. Thus, direct photolysis may be an important part of a multibarrier treatment approach.

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The effects of dissolved organic matter and feeding on bioconcentration and oxidative stress of ethylhexyl dimethyl p-aminobenzoate (OD-PABA) to crucian carp (Carassius auratus)

Yang

et al. 2017

Environ Sci Pollut Res

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Bioconcentration of UV filters in organisms is an important indicator for the assessment of environmental hazards. However, bioconcentration testing rarely accounts for the influence of natural aquatic environmental factors. In order to better assess the ecological risk of organic UV filters (OUV-Fs) in an actual water environment, this study determined the influences of dissolved organic matter (DOM) (0, 1, 10, and 20 mg/L) and feeding (0, 0.5, 1, and 2% body weight/d) on bioconcentration of ethylhexyl dimethyl p-aminobenzoate (OD-PABA) in various tissues of crucian carp (Carassius auratus). Moreover, oxidative stress in the fish liver caused by the OD-PABA was also investigated by measuring activities of superoxide dismutase (SOD), catalase (CAT) and glutathione S-transferase (GST), and levels of glutathione (GSH) and malondialdehyde (MDA). The bioconcentration of OD-PABA in the fish tissues was significantly decreased with the presence of DOM indicating a reduction of OD-PABA bioavailability caused by DOM. The bioconcentration factors (BCFs) decreased by 28.00~50.93% in the muscle, 72.67~96.74% in the gill, 37.84~87.72% in the liver, and 10.32~79.38% in the kidney at different DOM concentrations compared to those of the non-DOM treatments. Significant changes in SOD, CAT, GST, GSH, and MDA levels were found in the DOM- and OD-PABA-alone treatments. However, there were no significant differences in the SOD, CAT, GST, and MDA levels found when co-exposure to OD-PABA and DOM. Feeding led to lower OD-PABA concentrations in the fish tissues, and the concentrations were decreased with increasing feeding ratios. BCFs in various tissues reduced by 39.75~72.52% in the muscle, 56.86~79.73% in the gill, 66.41~87.50% in the liver, and 75.88~89.10% in the kidney, respectively. In the unfed treatments, the levels of SOD and MDA were significantly higher than those of the fed ones while GST and GSH levels were remarkably inhibited indicating the enhanced effect of starvation to oxidative stress. There was no markedly alternation of the biomarker levels observed between different fed treatments. In conclusion, our study indicated that both DOM and feeding reduced bioconcentration of OD-PABA and alleviated oxidative stress to some extent in the crucian carp.

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Aqueous photochemical degradation of BDE-153 in solutions with natural dissolved organic matter

Cited by 10 publications

References 46 publications

UV/sulphite as alternative for UV/H2O2 for micropollutant degradation in drinking water

UV/sulphite as alternative for UV/H2O2 for micropollutant degradation in drinking water

The Importance of Measuring Ultraviolet Fluence Accurately: A Review of Microcystin-LR Removal by Direct Photolysis

The effects of dissolved organic matter and feeding on bioconcentration and oxidative stress of ethylhexyl dimethyl p-aminobenzoate (OD-PABA) to crucian carp (Carassius auratus)

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