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13 Newest Publications about the topic karl fischer titration


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Dilute Vapor Absorption: A New Accurate Technique for Measurement of the Limiting Activity Coefficient of Water in Hydrophobic Solvents of Lower Volatility

28-Mar-2017 | Jan Haidl; Vladimír Dohnal, Journal of Chemical & Engineering Data, 2017

An accurate experimental method for the determination of the limiting activity coefficient of water in hydrophobic solvents was described theoretically; the pertinent apparatus was built and its performance was duly verified. The method is based on continuously saturating the solvent by a gas ...


Determination of Trace Water Content in Petroleum and Petroleum Products

27-Jul-2016 | Lillian A. Frink; Daniel W. Armstrong, Analytical Chemistry, 2016

Measurement of water in petroleum and petroleum-based products is of industrial and economic importance; however, the varied and complex matrixes make the analyses difficult. These samples tend to have low amounts of water and contain many compounds which react with iodine, causing Karl Fischer ...


Investigation on Physical Properties and Morphologies of Microemulsions formed with Sodium Dodecyl Benzenesulfonate, Isobutanol, Brine, and Decane, Using Several Experimental Techniques

31-May-2016 | Ayako Fukumoto; Christine Dalmazzone; Didier Frot; Loïc Barré; Christine Noïk, Energy & Fuels, 2016

In the context of chemical enhanced oil recovery (EOR), there is no well-established way to characterize and understand the physical properties and structures of microemulsions composed of crude oil and industrial surfactants due to their complexity. Making a comparison to a well-studied model ...


Thermal and oxidative stability of Atlantic salmon oil (Salmo salar L.) and complexation with β-cyclodextrin

02-Feb-2016 | Daniel I. Hădărugă, Mustafa Ünlüsayin, Alexandra T. Gruia, Cristina Birău (Mitroi), Gerlinde Rusu and Nicoleta G. Hă ..., Beilstein Journal of Organic Chemistry, 2016

Abstract The thermal and oxidative stability of Atlantic salmon oil (Salmo salar L.) as well as its β-cyclodextrin (β-CD) complexation ability has been verified for the first time. The main omega-3 fatty acids, EPA and DHA, were significantly degraded, even at 50 °C. Their relative ...


Dry Purification by Natural Adsorbents of Ethyl Biodiesels Derived from Nonedible Oils

18-Dec-2014 | Svitlana Nitièma-Yefanova; Romain Richard; Sophie Thiebaud-Roux; Brice Bouyssiere; Yvonne L. Bonzi-Coulibaly; Roger ..., Energy & Fuels, 2014

The purpose of this work is to analyze the efficiency of natural adsorbents (rice husk ash (RHA) versus corn husk ash (CHA)) for the dry purification of ethyl biodiesels obtained by transesterification via homogeneous catalysis of nonedible oils (Balagnites aegyptiaca, Azadirachta indica, and ...


Physicochemical Characterization of MFm–-Based Ammonium Ionic Liquids

29-May-2013 | Haifang Li; Guoying Zhao; Fangfang Liu; Suojiang Zhang, Journal of Chemical & Engineering Data, 2013

A series of ammonium-based ionic liquids (ILs), which share a homologous series of cations (CH3CH2)3N+(CnH2n+1) with n = 2, 4, 6, 8 and the anions with either BF4–, PF6–, or SbF6–, was synthesized. Their structures were confirmed by 1H and 13C NMR, ESI-MS, and elemental analysis. Meanwhile, the ...


Liquid–Liquid Equilibrium in Ternary Systems Present in Biodiesel Purification from Soybean Oil and Castor Oil at (298.2 and 333.2) K

21-Feb-2013 | Yurany C. Ardila; Alex B. Machado; Glaucia Maria F. Pinto; Rubens Maciel Filho; Maria R. Wolf Maciel, Journal of Chemical & Engineering Data, 2013

Liquid–liquid equilibrium (LLE) data for the soybean oil biodiesel (BIO-SO) + ethanol + water and castor oil biodiesel (BIO–CO) + ethanol + water systems at (298.2 and 333.2) K and atmospheric pressure were determined by gas chromatography and volumetric Karl Fischer titration. The degree of ...


In-Line Multipoint Near-Infrared Spectroscopy for Moisture Content Quantification during Freeze-Drying

04-Feb-2013 | Ari Kauppinen; Maunu Toiviainen; Ossi Korhonen; Jaakko Aaltonen; Kristiina Järvinen; Janne Paaso; Mikko Juuti; Jarkk ..., Analytical Chemistry, 2013

During the past decade, near-infrared (NIR) spectroscopy has been applied for in-line moisture content quantification during a freeze-drying process. However, NIR has been used as a single-vial technique and thus is not representative of the entire batch. This has been considered as one of the ...


Production of three certified reference materials for water content based on mixed solutions of butanol, xylene and propylene carbonate

24-Sep-2012 | Haifeng Wang, Kang Ma, Wei Zhang, Ting Huang, Xinhua Dai, Jia Li, Guohua Sun, Hongmei Li, Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement, 2012

Certified reference materials (CRMs) for water content with good accuracy and homogeneity are required for calibration or validation of the Karl Fischer titration and for establishing the traceability of water content results. Three such CRMs were produced and certified: GBW 13512, 13513 and ...


Water content of flavonoid/cyclodextrin nanoparticles: relationship with the structural descriptors of biologically active compounds

07-Jun-2011 | Daniel I., Hădărugă , Nicoleta G., Hădărugă , Geza N., Bandur , Heinz-Dieter, Isengard, Food Chemistry, 2011

The paper presents a study regarding the obtaining, characterization, and water evaluation of flavonoid (flavone, chrysin, naringenin, hesperetin, apigenin, fisetin, luteolin) and related compounds (cinnamic and caffeic acids, silybin)/cyclodextrin complexes. The thermogravimetric and ...


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