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.

Free and Total Water in Fertilizers

1971 ◽  
Vol 54 (4) ◽  
pp. 988-988
Author(s):  
R D Duncan
Keyword(s):  
Collaborative Study ◽  
Free Water ◽  
Azeotropic Distillation ◽  
Amyl Alcohol ◽  
Total Water ◽  
Karl Fischer Titration ◽  
Karl Fischer

Abstract Methods for the determination of free and total water in fertilizers are based on the Karl Fischer titration. Free water is extracted with 1,4-dioxane, and total water is separated by azeotropic distillation with n-amyl alcohol. Results of a preliminary collaborative study were in wide disagreement. It is recommended that the method be written in more explicit detail before further collaborative study.

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

scholarly journals Youden Analysis of Karl Fischer Titration Data from an Interlaboratory Study Determining Water in Animal Feed, Grain, and Forage

2005 ◽  
Vol 88 (6) ◽  
pp. 1840-1841 ◽  
Author(s):  
Frank E Jones
Keyword(s):  
Animal Feed ◽  
Systematic Errors ◽  
Interlaboratory Study ◽  
Matched Pairs ◽  
Karl Fischer Titration ◽  
Karl Fischer ◽  
Collaborative Studies ◽  
Titration Data ◽  
Repeatability And Reproducibility

Abstract Data from a recent interlaboratory study of the determination of water (moisture) in animal feed, grain, and forage (plant tissue) by Karl Fischer titration were re-analyzed using Youden plots. The purpose was to show the unique ability these plots possess of separating random and systematic errors visually while providing numerical estimates of the precision and the systematic error of the method. Furthermore, the usefulness of the technique is underscored because AOAC INTERNATIONAL allows the use of matched pairs in collaborative studies to obtain estimates of repeatability and reproducibility.

Automatic Karl Fischer Titration of Moisture in Grain

1981 ◽  
Vol 64 (6) ◽  
pp. 1277-1283
Author(s):  
Frank E Jones ◽  
Carroll S Brickenkamp
Keyword(s):  
Standard Deviation ◽  
Moisture Content ◽  
Systematic Uncertainty ◽  
Reference Method ◽  
Titration Method ◽  
Karl Fischer Titration ◽  
Karl Fischer ◽  
Moisture Content Level ◽  
Primary Reference

Abstract Automatic Karl Fischer titrators of the motor-driven buret type and the coulometric generation type were applied to the determination of moisture in grain. Techniques were developed to optimize the performance of the Karl Fischer titration method and to overcome disadvantages attributed to it. The imprecision (1 standard deviation) of a determination is typically 0.06% moisture content at a moisture content of 15%; the systematic uncertainty from known sources is estimated to be ±0.05% moisture content at a moisture content level of 15%. It is suggested that the method be designated as the primary reference method for grain in general and for corn and soybeans in particular.

Determination of Total and Free Water in Triple Superphosphate Fertilizers by Using Thermal Analysis

1985 ◽  
Vol 68 (4) ◽  
pp. 788-793
Author(s):  
Krystyna Kostyrko ◽  
Malgorzata Skoczylas ◽  
Andrzej Klee
Keyword(s):  
Thermal Analysis ◽  
Differential Scanning Calorimetry ◽  
Free Water ◽  
Total Water ◽  
Triple Superphosphate ◽  
Scanning Calorimetry ◽  
Thermal Methods ◽  
Dehydration Processes ◽  
Derivatographic Analysis

Abstract Thermal analysis methods were used to study dehydration of triple superphosphate. A redrying procedure followed by Q-derivatographic analysis (under quasiisobaric and quasiisothermal conditions) as well as differential scanning calorimetry (DSC) was applied. Attempts were made to establish the correct drying-oven temperature for determination of water content, i.e., the temperature at which free or total water is removed from the fertilizer. Thermal decomposition of monocalcium orthophosphate monohydrate, the major component of triple superphosphate, was studied and a model was advanced for the reactions that occur during decomposition of this salt. The free water was completely released when superphosphate was heated at a constant temperature of 85°C. The total water was entirely released at 160°C. At 150°C, the process of removing the water of crystallization from the orthophosphate was disturbed by other concomitant dehydration processes which result in irreversible decomposition of this salt. The results obtained indicate that the thermal methods of analysis used are complementary.

Reliable Determination of Water Contents of Bitumen and Vacuum Residua via Coulometric Karl Fischer Titration Using Tetrahydrofuran

2014 ◽  
Vol 32 (5) ◽  
pp. 602-609 ◽  
Author(s):  
L. Carbognani ◽  
L. C. Roa-Fuentes ◽  
L. Diaz ◽  
J. Berezinski ◽  
L. Carbognani-Arambarri ◽  
...  
Keyword(s):  
Karl Fischer Titration ◽  
Reliable Determination ◽  
Karl Fischer ◽  
Coulometric Karl Fischer Titration ◽  
Water Contents
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