Document Type
Article
Publication Date
2014
DOI
10.1039/c3em00587a
Publication Title
Environmental Science:: Processes & Impacts
Volume
16
Issue
4
Pages
757-763
Abstract
In this study it was observed that, during long-term irradiations (>1 day) of natural waters, the methods for measuring hydroxyl radical (˙OH) formation rates based upon sequentially determined cumulative concentrations of photoproducts from probes significantly underestimate actual ˙OH formation rates. Performing a correction using the photodegradation rates of the probe products improves the ˙OH estimation for short term irradiations (<1 day), but not long term irradiations. Only the ‘instantaneous’ formation rates, which were obtained by adding probes to aliquots at each time point and irradiating these sub-samples for a short time (≤2 h), were found appropriate for accurately estimating ˙OH photochemical formation rates during long-term laboratory irradiation experiments. Our results also showed that in iron- and dissolved organic matter (DOM)-rich water samples, ˙OH appears to be mainly produced from the Fenton reaction initially, but subsequently from other sources possibly from DOM photoreactions. Pathways of ˙OH formation in long-term irradiations in relation to H2O2 and iron concentrations are discussed.
Original Publication Citation
Sun, L. N., Chen, H. M., Abdulla, H. A., & Mopper, K. (2014). Estimating hydroxyl radical photochemical formation rates in natural waters during long-term laboratory irradiation experiments. Environmental Science: Processes & Impacts, 16(4), 757-763. doi:10.1039/c3em00587a
ORCID
0000-0003-2460-838X (Chen), 0000-0001-8089-6019 (Mopper)
Repository Citation
Sun, Luni; Chen, Hongmei; Abdulla, Hussain A.; and Mopper, Kenneth, "Estimating Hydroxyl Radical Photochemical Formation Rates in Natural Waters During Long-Term Laboratory Irradiation Experiments" (2014). Chemistry & Biochemistry Faculty Publications. 149.
https://digitalcommons.odu.edu/chemistry_fac_pubs/149
Included in
Biogeochemistry Commons, Chemistry Commons, Environmental Indicators and Impact Assessment Commons
Comments
This is the author's accepted manuscript, which has been through the Royal Society of Chemistry peer review process and has been accepted for publication.
The final edited form was published as:
Sun, L. N., Chen, H. M., Abdulla, H. A., & Mopper, K. (2014). Estimating hydroxyl radical photochemical formation rates in natural waters during long-term laboratory irradiation experiments. Environmental Science: Processes & Impacts, 16(4), 757-763. doi:10.1039/c3em00587a