The aim of this study was to investigate the application of oil in water (O/W) nanoemulsion as solvent in the extraction step for determination of oil content in oily water, measured using a UV visible spectrophotometer (UV-vis) and a total organic carbon (TOC) analyzer. The optical micrographs and distribution size curves showed that the use of a small amount of nanoemulsion was capable of transforming the oily water in a colloidal dispersion that can be read in the UV-vis and TOC-VCHS devices. The oil content results obtained showed great accuracy between the measurements, with very low average standard deviation (∼5%) for both UV-vis and TOC-VCHS. The new methods suggested in this work are very promising, since they allow simple, quick and accurate analyses, and especially require a lower volume of solvent (less than 1%) compared to those used in conventional analytic methods.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.talanta.2013.01.040 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Experimental unified pH scale in 1,2-dichloroethane.
Phys Chem Chem Phys
January 2025
Institute of Chemistry, University of Tartu (UT), Ravila Street 14a, 50411 Tartu, Estonia.
Experimental potentiometric unified pH (pH) scale is presented in 1,2-dichloroethane (1,2-DCE). The scale was compiled using differential potentiometric measurements, carried out by pair-wise comparisons between solutions. Aqueous standard buffer solutions were used as anchor points, so that the obtained pH values are linked to (, are traceable to) the conventional aqueous pH scale and are expressed as values.
View Article and Find Full Text PDFUnlocking High-Throughput Plasma-Catalytic Low-Temperature Oxidation of -Hexane over Single-Atom Ag/MnO Catalysts.
JACS Au
January 2025
College of Chemical and Biological Engineering, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, China.
The total oxidation of -hexane, a hazardous volatile organic compound (VOC) emitted by the pharmaceutical industry, presents a significant environmental challenge due to limited catalyst activity at low temperatures and poor stability at high temperatures. Here, we present a novel approach that overcomes these limitations by employing single-atom Ag/MnO catalysts coupled with nonthermal plasma (NTP). This strategy achieves exceptional performance in -hexane oxidation at low temperatures, demonstrating 96.
View Article and Find Full Text PDFA dynamic mass balance model was developed to simulate contamination dynamics in the process water of fresh and frozen fruits, vegetables and herbs (ffFVH) during processing and handling operations. The mass balance relates to the flux of water and product in a wash tank and the number of microbial cells released in the water, inactivated by the water disinfectant or transferred from the water back to the product. Critical variables describing microbial dynamics in water are: (i) the chemical oxygen demand (COD), as an indicator of the concentration of organic matter; (ii) free chlorine (FC) and particularly its antimicrobial fraction, hypochlorous acid (HOCl); and (iii) the microbial population levels.
View Article and Find Full Text PDFFire-driven disruptions of global soil biochemical relationships.
Nat Commun
January 2025
Laboratorio de Biodiversidad y Funcionamiento Ecosistémico. Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS). Consejo Superior de Investigaciones Científicas (CSIC). Av. Reina Mercedes 10, E-41012, Sevilla, Spain.
Fires alter the stability of organic matter and promote soil erosion which threatens the fundamental coupling of soil biogeochemical cycles. Yet, how soil biogeochemistry and its environmental drivers respond to fire remain virtually unknown globally. Here, we integrate experimental observations and random forest model, and reveal significant divergence in the responses of soil biogeochemical attributes to fire, including soil carbon (C), nitrogen (N), and phosphorus (P) contents worldwide.
View Article and Find Full Text PDFA solvent-free thermal desorption-gas chromatography-tandem mass spectrometry method (TD-GC-MS/MS) for the determination of polycyclic aromatic hydrocarbons in gas phase airborne samples.
J Chromatogr A
January 2025
Environmental Health Laboratory Branch, Center for Laboratory Sciences, California Department of Public Health, Richmond, CA 94804, USA.
A solvent-free, thermal extraction method for analysis of polycyclic aromatic hydrocarbons (PAHs) in gas phase airborne samples was developed. A fully automated thermal desorber (TD) coupled with highly selective and sensitive gas chromatography-tandem mass spectrometry (GC-MS/MS) was used to determine the concentration of trace level PAHs. Air sampling was conducted to tune the sampling and analytical conditions.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!