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Dataset results
8 results for “UV absorbance”
Time series of in situ Uv-Vis absorbance spectra and high-frequency predictions of total and soluble Fe and Mn concentrations measured at multiple depths in Falling Creek Reservoir (Vinton, VA, USA) in 2020 and 2021
High-frequency measurements of light absorbance were collected at multiple depths in Falling Creek Reservoir (FCR; Vinton, VA, USA) using a s::can Spectrolyser UV-Visible spectrophotometer coupled with a multiplexor pumping system. The system pumps water samples from individual depths into a flow-through cuvette where the UV-vis absorbance spectra of the sample are measured by the spectrophotometer. The system used in our study collected measurements of light absorbance every 2.5 nm wavelengths from 200 nm to 732.5 nm (optical path length of 10 mm) approximately at an hourly time step for seven monitoring depths in the reservoir. Data was collected during two periods; the first deployment (16 October to 9 November 2020) was to observe changes in Fe and Mn concentrations before, during, and after reservoir fall turnover and the second deployment (26 May to 21 June 2021) was to observe the effects of engineered hypolimnetic oxygenation on Fe and Mn concentrations. Partial least squares regression models were developed to generate predictions of total and soluble Fe and Mn concentrations based on the correlation between absorbance spectra and sampling data.
Spectral Effects of Absorbing Aerosols on Backscattered UV Radiation
<p>Satellite measurements of backscattered UV radiation are sensitive to the presence of UV-absorbing aerosols in the atmosphere. These measurements are commonly used for determining the concentration of atmospheric trace gases such as O<sub>3</sub>, SO<sub>2</sub>, and H<sub>2</sub>CO.</p> <p>The theoretical results in this dataset describe the effects of UV-absorbing mineral dust and carbonaceous smoke aerosols on these backscatter satellite measurements between 300-400 nm. The information provided is independent of any specific trace gas retrieval algorithm and does not require detailed a priori knowledge of aerosol and surface properties.</p> <p>The results are derived from the analysis of the radiative transfer model simulations performed with the optical property data used in the Ozone Monitoring Instrument (OMI) UV aerosol retrieval algorithm, OMAERUV. Results from this algorithm have been validated with Aerosol Robotic Network (AERONET) observations (Jethva & Torres, 2011; Torres et al., 2018).</p> <p>This dataset is associated with the following publication:</p> <p>Jethva, H., Haffner, D., Bhartia, P. K., & Torres, O. (2022). Estimating Spectral Effects of Absorbing Aerosols on Backscattered UV Radiation, Earth Space Sci., Accepted.</p>
Riverine truly dissolved, colloidal, and operationally dissolved ferric iron, dissolved organic carbon, UV-vis absorbance at 254 and 412 nm, and specific UV absorbance (SUVA) at 254 nm
<p>This dataset is attached to the following article:</p> <p>Logozzo, L.A., Martin, J.W., McArthur, J., Raymond, P.A. Contributions of Fe(III) to UV-vis absorbance in river water: A case study on the Connecticut River and argument for the systematic tandem measurement of Fe(III) and CDOM. <em>Biogeochemistry</em> <strong>160</strong>: 17–33 (2022). https://doi.org/10.1007/s10533-022-00937-5</p> <p>This dataset includes concentrations of ferric iron, Fe(III), and dissolved organic carbon (DOC) along with UV-vis absorbance at 254 nm and 412 nm on the operationally dissolved size fraction (<0.22 μm), as well as the truly dissolved (<0.02 μm) and colloidal (0.02-0.22 μm) size fractions. Samples were collected every two weeks at five sites along the Connecticut River mainstem from 2018 to 2020 and at 7 sites in the Connecticut River watershed sampled once synoptically during the summer 2019.</p>
Hydrogen-bonded xanthones as potential UV absorbers. The synthesis of xanthones from bio-renewable cardanol utilizing a ceric ammonium sulfate (CAS) mediated oxidation reaction
<p>The synthesis of hydrogen-bonded xanthones using the bio-renewable phenol, cardanol is described. Cardanol was initially converted into hydroxy-benzophenones. These benzophenones were converted into xanthones utilizing an oxidative ceric ammonium sulfate (CAS) mediated reaction. Subsequent ruthenium-mediated late-stage oxidation of the xanthones provided hydrogen-bonded xanthones, which displayed good UVA and UVB absorbing properties.</p>
UV-Vis absorbance data, molar extinction coefficients and circular dichroism spectra for the two cyanobacterial metabolites anabaenopeptin A and anabaenopeptin B
<p>Data for:</p> <p>"<span>The UV-Vis absorbance spectra, molar extinction coefficients and circular dichroism spectra as well as NMR and mass spectrometry spectra were determined for two prominent secondary metabolites from cyanobacteria, namely anabaenopeptin A and anabaenopeptin B. The compounds were extracted from the cyanobacterium </span><em><span>Planktothrix rubescens</span></em><span> CBT929 and purified by flash chromatography and HPLC. Exact amounts of isolated compounds were assessed by quantitative <sup>1</sup>H-NMR with internal calibrant ethyl 4-(dimethylamino)benzoate in DMSO-<em>d<sub>6</sub></em> at 298 K with a recycle delay (d1) of 120 s. UV-Vis absorbance spectra were recorded in methanol at room temperature. Molar extinction coefficients were determined at 278 nm as 4190 M<sup>-1</sup> cm<sup>-1</sup> and 2300 M<sup>-1</sup> cm<sup>-1</sup> in methanol for anabaenopeptin A and anabaenopeptin B, respectively. Circular dichroism spectra and secondary fragmentation mass spectra are also reported."</span></p>
Is OSSO a significant contributor to the unknown UV absorber in Venus' atmosphere?
<p>Datasets for figures and output of PCM model run as detailed in the corresponding paper.</p>
Clinical Study of a UV-Absorbing Acrylic Posterior Chamber Intraocular Lens
ClinicalTrials.gov study NCT00625313. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Photoprotection Efficacy With Sunscreen Formulas Containing the Cyclic Merocyanine Long-UVA Absorber MCE Under UV Day Light Exposure
ClinicalTrials.gov study NCT04866797. IPD Sharing: YES. Countries: 1. Publications: 0.
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