15
Jan
Principle Of Moisture Content Determination. The principle of the thermogravimetric method of moisture content determination is defined as the weight loss of mass that occurs as the material is heated. Such water retains its usual physical properties and serves as dispersing agent for the colloidal substances and as a. Dry basis moisture may exceed 100 and is a non-linear function. Determination of Moisture Content Moisture Meter s Estimation is quick and convenient Estimation is approximate not precise Estimation is generally based on electric conductivity Meter s to be calibrated for each species Only to be used if the results are comparable with an oven method Air Oven Method Standard reference method Estimation is.
Both can be used as a measure of the amount of moisture in a gas. The sample weight is taken prior to heating and again after reaching a steady-state mass subsequent to drying. Moisture content is given with the relation 100 w w d wb W W W mc where mc is expressed on wet basis W w is wet weight and W d is dry weight. Karl fischer reagent which reacts quantitatively and selectively with water to measure moisture contents. Dry basis moisture may exceed 100 and is a non-linear function. Dry Basis Moisture Content.
Reference method has been established ISO 1446.
The water reacts with iodine. Wet Basis Moisture Content. It was invented in 1935 by the German chemist Karl Fischer. It consists of an infrared weighing and heating unit. They are inherently related and one can be calculated from the other fairly accurately. M 100 x Wet Weight Dry Weight Wet Weight.