Determination of total water content in inulin using the volumetric Karl Fischer titration

Talanta ◽  
2006 ◽  
Vol 70 (5) ◽  
pp. 1006-1010 ◽  
Author(s):  
Sébastien N. Ronkart ◽  
Michel Paquot ◽  
Christian Fougnies ◽  
Claude Deroanne ◽  
Jean-Claude Van Herck ◽  
...  
Keyword(s):  
Water Content ◽  
Total Water Content ◽  
Total Water ◽  
Karl Fischer Titration ◽  
Karl Fischer

Determination of water content in bee’s pollen samples by Karl Fischer titration

Food Control ◽  
2006 ◽  
Vol 17 (3) ◽  
pp. 176-179 ◽  
Author(s):  
Iosif Gergen ◽  
Florina Radu ◽  
Despina Bordean ◽  
Heinz-Dieter Isengard
Keyword(s):  
Water Content ◽  
Karl Fischer Titration ◽  
Karl Fischer

scholarly journals Simple Modification of Karl-Fischer Titration Method for Determination of Water Content in Colored Samples

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Eva Tavčar ◽  
Erika Turk ◽  
Samo Kreft
Keyword(s):  
Water Content ◽  
Visual Detection ◽  
Moisture Determination ◽  
Spectrophotometric Detection ◽  
Karl Fischer Titration ◽  
Simple Modification ◽  
Karl Fischer ◽  
Titration Endpoint ◽  
Specialized Equipment

The most commonly used technique for water content determination is Karl-Fischer titration with electrometric detection, requiring specialized equipment. When appropriate equipment is not available, the method can be performed through visual detection of a titration endpoint, which does not enable an analysis of colored samples. Here, we developed a method with spectrophotometric detection of a titration endpoint, appropriate for moisture determination of colored samples. The reaction takes place in a sealed 4 ml cuvette. Detection is performed at 520 nm. Titration endpoint is determined from the graph of absorbance plotted against titration volume. The method has appropriate reproducibility (), accuracy, and linearity ().

scholarly journals Estimation of the degree of stability of grape varieties in arid conditions of the Astrakhan region

2019 ◽  
pp. 17-22
Author(s):  
Елена Полухина ◽  
Elena Polukhina ◽  
М. Власенко ◽  
M. Vlasenko ◽  
Николай Петров ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Water Content ◽  
Water Deficit ◽  
Drought Resistance ◽  
Total Water Content ◽  
Total Water ◽  
Arid Conditions ◽  
Grape Varieties ◽  
High Degree

Abstract. Scientific novelty and practical significance. Due to the presence of a strong root system, the grapes are a rather drought-resistant crop, but the lack of soil and air moisture adversely affects the growth and development of the plant, which ultimately significantly reduces the yield. In the soil and climatic conditions of the Astrakhan region, characterized by a high degree of aridity, as well as the presence of light chestnut structureless soils that retain moisture poorly, the study of the drought tolerance of grape varieties is particularly relevant. The purpose of the research was to study the degree of drought tolerance of grape varieties to identify the adaptive mechanisms of plants in the arid conditions of the region. To achieve the goal, the following tasks were solved: determination of the total water content in the leaves and the relative turghorescence of the leaves; determination of water deficiency in the leaves; determination of water-holding capacity of leaves, as the main indicator of drought resistance. Methods. The object of research was 12 grape varieties of various technological orientations grown on the territory of the vineyard of the Caspian Agrarian Federal Scientific Center of the Russian Academy of Sciences. Were investigated early ripe varieties (Vostorg, Astrahanskij skorospelyj, Madlen muskatnyj, Koroleva vinogradnikov, Shasla belaya, Bianka, Fioletovyj rannij) and mid-season varieties (Kishmish Luchistyj, Husajne rozovyj, Levokumskij). For control were taken: Kodryanka – for early ripe varieties; Karamol – for varieties of medium ripening. The experience laid down by the method of B.A. Dospehov. The scheme of planting bushes 1250.0 pcs/ha. Formation of bushes – fan, four-sleeve. Irrigation was carried out on furrows with a norm of 600.0–800.0 m3/ha. To assess the adaptive resistance of grape varieties to drought, we determined: the total water content in the leaves, the relative turborescence of the leaves according to the Witherly method, the water deficit in the leaves according to the Litvinov method, and the water retention capacity according to the Eremeev method. Results. The lowest water deficit in the group of early ripening varieties was found in the varieties Kodryanka, Madlen muskatnyj and Koroleva vinogradnikov (4.9–5.7 %); in the group of middle-ripening varieties, the varieties are Levokumskij and Kishmish Luchistyj (4.7–5.0 %). As a result of the research, 7 varieties with a high degree of drought resistance were identified: Kodryanka, Astrahanskij skorospelyj, Koroleva vinogradnikov, Shasla belaya, Karamol, Kishmish Luchistyj and Husajne rozovyj.

scholarly journals Headspace Volumetric Karl Fischer Titration for the Determination of Water Content in Finished Tobacco Products

2012 ◽  
Vol 25 (1) ◽  
pp. 350-359
Author(s):  
N Aydin ◽  
F Chardonnens ◽  
M Rotach
Keyword(s):  
Sample Size ◽  
Water Content ◽  
Karl Fischer Titration ◽  
Intermediate Precision ◽  
Time Saving ◽  
Tobacco Products ◽  
Karl Fischer ◽  
Highly Sensitive ◽  
Good Repeatability

AbstractBecause many physicochemical properties of tobacco are highly sensitive to its moisture content, the determination of water level is an important parameter for tobacco characterization. A headspace volumetric Karl Fischer titration (HS-V-KFT) method is presented for the quantification of water content in different finished tobacco materials. The parameters affecting the extraction of water from the tobacco materials were the sample size and the oven temperature which have been optimized. The extraction of water from the samples was achieved within a reasonable time (<25 min) with a sample size of 200 mg and an optimum temperature of between 90 °C and 100 °C. The results of the water determination by HS-V-KFT at the optimized parameters were in good agreement with those obtained by standard volumetric Karl Fischer titration. HS-V-KFT showed very good repeatability (RSDr 0.9%) and intermediate precision (RSDiR 1.1%). With respect to a considerable time saving, solvent consumption reduction, precision and accuracy, HS-V-KFT can therefore be suggested as the method of choice to determine water amount in finished tobacco products.

scholarly journals Elaboration of near infrared spectroscopy model for determination of water content in freeze-dried immunological veterinary medicinal products

2016 ◽  
Author(s):  
Krzysztof Bulenger ◽  
Dorota Marta Krasucka ◽  
Bogumił Biernacki ◽  
Jakub Szumiło ◽  
Beata Cuvelier
Keyword(s):  
Infrared Spectroscopy ◽  
Water Content ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Residual Water ◽  
Medicinal Products ◽  
Karl Fischer Titration ◽  
Karl Fischer ◽  
Veterinary Medicinal Products

Residual water is a critical parameter in assessing the quality of immunological veterinary medicinal products (IVMPs). In majority of the laboratories the Karl Fischer titration (KFT) is used for the determination of water content in IVMPs. However, the transfer of IVMP into titration cell without affecting the baseline drift and repeatability seems to be the main problem when using this method. In turn, Near Infrared Spectroscopy (NIRS) allows measurement of closed vials, therefore eliminating the impact of atmospheric conditions on the sample. The aim of the study was to create a calibration model based on the reference method (Karl Fischer titration) and its optimization. Five different IVMPs designated for two animal species (dogs and rabbits) were used. The model was constructed on the basis of 49 samples tested, each in triplicate (n=147). The spectra were divided in two sets: calibration and validation. Proper selection of samples and their processing allowed to obtain a model of high quality (Q-value>0.6).

Determination of Free and Total Water in Fertilizers by Karl Fischer Titration

1969 ◽  
Vol 52 (6) ◽  
pp. 1127-1131 ◽  
Author(s):  
R D Duncan ◽  
J A Brabson
Keyword(s):  
Free Water ◽  
Amyl Alcohol ◽  
Total Water ◽  
Karl Fischer Titration ◽  
Karl Fischer ◽  
Hydrate Water ◽  
The Difference

Abstract Free water in fertilizers is determined by extraction of the sample with 1,4-dioxane and titration of the extract with Karl Fischer reagent. Total water is determined by distillation of n-amyl alcohol from its mixture with the sample and titration of the distillate with Karl Fischer reagent. Hydrate water is taken as the difference between the total water and the free water.

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