Determination of water traces in various organic solvents using Karl Fischer method under FIA conditions

Dantan, Nathalie

doi:10.1016/s0039-9140(00)00328-3

Cited by 36 publications

(23 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For higher concentrations of water, linearity disappears due either to immiscibility, for solvents that are poorly miscible with water, or concomitance of other effects besides specific hydrogen bonding donation interactions with the nitrile groups of the sensor. The most common method for water content determination is the Karl-Fischer method which has a sensitivity limit of ∼50 ppm [36]. This method, however, is inadequate for water content determination in microenvironments, a requisite that is most useful in the study of heterogeneous systems.…”

Section: Discussionmentioning

confidence: 99%

Using hydrogen bonding-specific interactions to detect water in aprotic solvents at concentrations below 50ppm

Pinheiro

Lima

2006

Sensors and Actuators B: Chemical

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

Using hydrogen bonding-specific interactions to detect water in aprotic solvents at concentrations below 50ppm

Pinheiro

Lima

2006

Sensors and Actuators B: Chemical

View full text Add to dashboard Cite

“…The standard method for water determination is coulometric Karl Fischer titration (Dantan et al 2000). The electrochemical approach is generally highly reliable; however, in some cases, especially for relatively small water concentrations and highly lipophilic, aprotic solvents, it may potentially be sensitive to, e.g., sample acquisition due to tendency of water to spontaneously accumulate close to more hydrophilic surfaces-e.g., glassware.…”

Section: Introductionmentioning

confidence: 99%

“…The electrochemical approach is generally highly reliable; however, in some cases, especially for relatively small water concentrations and highly lipophilic, aprotic solvents, it may potentially be sensitive to, e.g., sample acquisition due to tendency of water to spontaneously accumulate close to more hydrophilic surfaces-e.g., glassware. This effect may result in inaccurate determination results (Dantan et al 2000;Gergen et al 2006). Moreover, the Karl Fischer titration method is difficult to be implemented as a part of, e.g., industrial or technological process, or to be used to continuously monitor any occurrence of water in sample media.…”

Section: Introductionmentioning

confidence: 99%

Improving Fluorometric Determination of Water Content in Aprotic Solvents

et al. 2017

View full text Add to dashboard Cite

A fluorometric method allowing quantification of minute amounts of water in highly lipophilic solvents is proposed. This approach takes advantage of resonance energy transfer between 4-methylumbelliferone and Sudan I. The conditions required to observe effective energy transfer have been elucidated. The emission band of the donor molecule (4-methylumbelliferone) depends strongly on the water content-its position is affected by protolytic reactions occurring between the fluorescent dye and water in lipophilic solvent media. In consequence, the extent of overlap between the emission band of the donor and absorption peak of the acceptor scales with the water concentration. The sensitivity of this optical system can be considerably increased by addition of organic bases. The dependence of the emission band of 4-methylumbelliferone/Sudan I system on minute amount of water present in lipophilic solutions opens up possibility of determination of water content in these media at the unique wavelength, in a turn on mode. The presented system was successfully applied to determine water in model commercial oil samples. It was shown that using herein proposed method the increase of water contents in the sample can be observed as increase of the emission intensity, despite the native fluorescence of the vegetable oil samples. For these samples, a good correlation with golden standard Karl Fischer titration was obtained.

show abstract

“…Water is considered to be their commonest contaminant and substantially modifies their properties. Standard methods for determining water include the Karl Fischer titration [1], IR [2] and NMR spectrometry [3], GC [4], and distillation [5]. These methods yield accurate information, frequently with low detection limits, but are slow and require a laboratory and a special working protocol.…”

Section: Introductionmentioning

confidence: 99%