Instant coffee. Determination of moisture content. Karl Fischer method (Reference method)

2009 ◽  
Keyword(s):  
Moisture Content ◽  
Reference Method ◽  
Karl Fischer ◽  
Instant Coffee ◽  
Karl Fischer Method ◽  
Fischer Method

Determination of Moisture in Molasses by the Karl Fischer Method

1973 ◽  
Vol 56 (4) ◽  
pp. 1025-1025
Author(s):  
Boris Kviesitis
Keyword(s):  
Moisture Content ◽  
Karl Fischer ◽  
Karl Fischer Method ◽  
Aoac Method ◽  
Fischer Method

Abstract The AOAC method for the determination of the moisture content of molasses, 31.074–31.076, has been modified so that it is applicable to a variety of molasses products and not only to feed grade molasses (diluted to 79.5° Brix).

scholarly journals Comparisons of Karl Fischer Method with Oven Methods for Determination of Water in Forages and Animal Feeds

1999 ◽  
Vol 82 (4) ◽  
pp. 799-808 ◽  
Author(s):  
Nancy Thiex ◽  
Terri Van Erem
Keyword(s):  
Standard Error ◽  
Near Infrared ◽  
Corn Silage ◽  
Infrared Reflectance ◽  
Near Infrared Reflectance ◽  
Karl Fischer ◽  
Animal Feeds ◽  
Karl Fischer Method ◽  
Fischer Method

Abstract In a comparative study of the Karl Fischer method with oven methods for determination of water in forages and animal feeds, oven methods yielded the following relative recoveries (expressed as a percentage of the recovery obtained by the Karl Fischer method) for hay, haylage, and corn silage, respectively: (1) drying at 135°C for 2 h (AOAC 930.15), 113,162, and 133%; (2) drying at 104°C for 3 h (AOAC 935.29), 96,122, and 113%; and (3) drying at 104°C for 6 h, 97, 129, and 117%. Relative recoveries for nonurea-containing and urea-containing feed, respectively, were as fol lows: (1) drying at 135°C for 2 h (AOAC 930.15), 116 and 2746% (2) drying at 104°C for 3 h (AOAC 935.29), 88 and 239%; (3) drying at 95°C for 5 h under vacuum (AOAC 934.01), 83 and 727% (4) drying at 104°C for 6 h, 90 and 427%; and (5) drying at 110°C for 3 h, 94 and 425%. Preliminary near-infrared reflectance calibrations for water (moisture) based on the Karl Fischer method were promising (r2 = 0.98; standard error of calibration = 0.20).

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.

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