Showing papers on "Fluorescence spectrometry published in 2022"
TL;DR: In this paper, the fouling and cleaning behaviors of RO membranes, of full-scale seawater reverse osmosis (SWRO) plant after eight months of operation, were thoroughly investigated via membrane autopsies and foulants characterization.
13 citations
TL;DR: In this paper, the authors presented the study of selected painted fragments from different contexts of Ostia Antica city, dating between 2nd century BCE and the end of the 1st century CE.
9 citations
TL;DR: In this article, the authors examined the sedimentary environment, evolution, and abundance of the organic matter in the “a" member of the Upper Ordovician Tanjianshan Group from the northern margin of the Qaidam Basin.
8 citations
TL;DR: In this paper, a residual sequential Gaussian co-simulation (RCoSGS) was proposed to incorporate both continuous and categorical auxiliary variables for spatial simulation of soil Cu, and robust geographically weighted regression (RGWR) was established to correct the spatially non-stationary effects of field environmental factors on in-situ PXRF.
6 citations
TL;DR: In this paper, the capability of cycloamylose (CA) to improve the solubility and stability of fat-soluble vitamins (FSV) by forming a complex was investigated.
Abstract: Fat-soluble vitamins (FSV) have beneficial biological activities, but their application is limited due to low solubility and stability. We investigated the capability of cycloamylose (CA) to improve the solubility and stability of FSV by forming a complex. The PXRD, FTIR, fluorescence spectrometry, 1D NMR, and 2D NMR analyses supported the complex formation between CA and FSV in both solution and solid states. Especially, interaction between FSV hydrophobic moiety and CA interior was elucidated by NMR. The solubility of FSV continuously increased without aggregation in 5% ethanol solution at 30 °C with CA concentration of up to 60 mM, while it either reached to plateau or showed a maximum value with the concentration of cyclodextrin (CD) and maltodextrin (MD), commercial agents. As CA concentration increased, a photo-degradation rate of FSV significantly reduced in 5% ethanol solution at room temperature (RT). Highly soluble and stable characteristics of CA, especially at high concentration, were responsible for the enhanced solubility and stability of FSV upon complexation with CA, suggesting the potential usage of CA as a promising host molecule.
4 citations
TL;DR: In this paper, the authors used data collected using a portable X-ray fluorescence spectrometer to examine ceramic artifacts found during the excavation of historic Brook Green Plantation, in Georgetown County, South Carolina.
Abstract: This study used data collected using a portable X-ray fluorescence spectrometer to examine ceramic artifacts found during the excavation of historic Brook Green Plantation, in Georgetown County, So...
4 citations
2 citations
TL;DR: In this paper, a simple method was developed for label-free and indirect detection of L-Cysteine by chemical vapor generation-atomic fluorescence spectrometry (CVG-AFS) based on the phenomenon that L-Cys can inhibit the CVG of arsenic ion (As(III)).
2 citations
1 citations
TL;DR: In this article , the main subject concerns comparing different techniques to prepare raw clay samples for energy-dispersive X-ray fluorescence spectrometry (EDXRF) and three kinds of sample preparation procedures are examined, such as loose powder, pressed pellet, and fired pellet.
1 citations
TL;DR: In this article, functionalized graphene quantum dots (GQDs) were used for the optical detection of arsenic at room temperature, and the experimental results suggested excellent sensitivity and selectivity towards As (III).
Abstract: Here, we report functionalized graphene quantum dots (GQDs) for the optical detection of arsenic at room temperature. GQDs with the fluorescence of three fundamental colors (red, green, and blue) were synthesized and functionally capped with L-cysteine (L-cys) to impart selectively towards As (III) by exploiting the affinity of L-cys towards arsenite. The optical characterization of GQDs was carried out using UV-vis absorption spectroscopy, Fourier transform infrared spectroscopy, and fluorescence spectrometry, and the structural characterizations were performed using transmission electron microscopy. The fluorescence results showed instantaneous quenching in intensity when the GQDs came in contact with As (III) for all test concentrations over a range from 0.025 to 25 ppb, which covers the permissible limit of arsenic in drinking water. The experimental results suggested excellent sensitivity and selectivity towards As (III).
TL;DR: In this article , X-ray fluorescence spectrometers were used to detect trace elements in bread samples, and the intensities of the lines of these trace elements, as a function of concentration, were measured to establish the sensitivity of the spectrometer.
Abstract: This work deals with applying X-ray fluorescence spectrometry to detect trace elements in bread samples. The intensities of the lines of these trace elements, as a function of concentration, were measured to establish the sensitivity of the spectrometer. The result obtained that the two peak energies found 3.31 KeV and 13.47 KeV are energies of the Kα peak of K2O and Br respectively. The results obtained that the highest element and compound concentrations in all samples are Nb (11.05–1971.97) ppm and K2O (6.5–51.932) ppm respectively, while the least element and compound concentrations in all samples are Zr (0.34–934.0) ppm and MnO (1.10–14.790) ppm, respectively.
TL;DR: The average abundance of non-fibrous particles captured by the plankton silks and detectable by microscopy was estimated to be around 0.01m-3, with the highest concentrations evident in shelf seas of northwest Europe.
TL;DR: In this article , the content of chemical elements occurring in waste in large, small and trace amounts was determined using two instrumental analysis techniques: ICP-OES and WDXRF.
Abstract: Determination of the content of chemical elements occurring in waste in large, small and trace amounts was performed using two instrumental analysis techniques: ICP-OES—Inductively Coupled Plasma Optical Emission Spectrometry and WDXRF—Wavelength Dispersive X-ray Fluorescence Spectrometry. Since such analyses are expensive and time-consuming, the objective of the work presented in this paper was the development of a quick and inexpensive method for preliminary, scanning-based identification of the chemical composition of tested samples (solid, bulk or powder) using standardless, semi-quantitative analysis. An optimized method of preparing samples for X-ray measurements by pressing into a durable tablet, universal for all materials tested, was developed. Moreover, limits of quantification were determined, and the uncertainty of the results obtained was estimated by comparing them with the results acquired with the use of the accredited calibration method, employing standards and certified reference materials.