... into four different molecular-weight fractions with ultrafiltration, and the fractions were measured for the concentrations of dissolved organic C (DOC), N, and carbohydrates, aromaticity (specific ultraviolet [UV] absorbance at 254 nm), pH, and bioavailability to bacteria. The percentage of DOC in the low...

...Fig. 5. General representation of dissolved organic C (DOC), specific ultraviolet absorbance (SUVA), discharge ( Q ), precipitation ( P ), and solute concentrations measured in the stream outlet of the Meerdaal catchment during a rainfall event (29 June 2011). ...

...Fig. 4. Schematic depiction of the temporal development of specific ultraviolet absorbance (SUVA), dissolved organic C (DOC), total Fe content, and pH values during the period of observation for the Wu01, Wu03, Wu08, Wu09, Wu12, and Wu15 sampling locations and the Wüstebach main gauging point...

...Fig. 4. Correlation between bulk and molecular measurements: (A) comparison between the percentage of lignin and tannin markers (LIG-TAN) and specific ultraviolet absorbance (SUVA) values determined at 254 nm; (B) comparison between the percentage of LIG-TAN and δ 13 C values; and (C) comparison...

... interference, Fe 2+ ions and DOC absorbed ultraviolet light strongly in regions of the spectrum where NO 3 − also exhibited significant absorption. Natural water samples showed very low concentrations of Fe 2+ , which do not cause interference with nitrate measurements. A two-wavelength measurement scheme...

.... , Fugii , R. , and Mopper , R. , 2003 , Evaluation of specific ultraviolet absorbance as an indicator of the chemical composition and reactivity of dissolved organic carbon : Environmental Science & Technology , v. 37 , p. 4702 – 4708 , https://doi.org/10.1021/es030360x...

...-260 m µ is fairly persistent and one of the samples had a strong peak at 260 m µ . Benzenoid compounds as well as pyridines absorb in this region, as do humic acid extracts ( Gex and Firtion, 1944 ) and the present substance or substances may be of this nature. Fig. 3. Ultraviolet absorption...

... of solar radiation. The wavelength of incoming solar radiation varies between ~300 and 2500 nm. Ultraviolet (UV) radiation consists of radiation with wavelengths <400 nm, while infrared (IR) radiation consists of radiation with wavelengths >800 nm. UV-C (200–280 nm) radiation is absorbed...

... in the plume. The first volcanological DOAS observations were made in 1992 from a scientific vessel cruising the Mediterranean – more specifically, downwind of the steaming craters of Etna, Stromboli and Vulcano ( Edner et al. 1994 ). A rather bulky ultraviolet spectrometer was employed...

... between ~250 and 800°C. Removal of these strongly held molecules probably occurs at the same time as the decomposition of the drug molecule, accounting for the DTA steps recorded in this temperature range. The ability of the systems prepared to absorb visible-ultraviolet (V-UV) radiation was checked...

... on the absorbance spectra. oxidation palynology ultraviolet-B FTIR sporopollenin Sporomorphs (pollen and spores) are the reproductive vectors of land plants. The outer sporomorph wall, or exine, is formed of a highly durable biopolymer called sporopollenin ( Brooks & Shaw, 1968 , 1978...

... of an ozone (O 3 ) layer, plankton would have been subject to higher levels of ultraviolet radiation (UVR), in particular UV-C (100–280 nm) ( Cockell, 2000 ). Because DNA strongly absorbs at 254 nm, UV-C causes DNA strand breakage ( Sinha and Häder, 2002 ) and the formation of photoproducts...

... its practical applications. The objective of the present study was to mitigate these problems by synthesizing the g-C 3 N 4 in the presence of exfoliated montmorillonite (Mnt). Compared with bulk montmorillonite, the specific surface area of exfoliated two-dimensional Mnt layers was significantly...

... by Raman spectroscopy can be related to a specific absorption with apparent maximum in the range 405–568 nm, thus absorbing from violet to yellow–green. This is the first study of the precise relation between Raman and diffuse reflectance spectra of cultured freshwater pearls. * Corresponding author, e...