Why do loss on drying

It compares the weight of the product before and after drying and the difference in weights is considered as moisture percentage in the product. Even though loss on drying is the most commonly used method but still Karl Fischer method is more suitable as it produces consistent results when product has high level constituents or volatile impurities which impact moisture and also when the product has less moisture content.

Sign In. Water content and Loss on Drying Wall Details. Loss in drying does not usually refer to molecularly bound water or water of crystallisation. For loss in drying LOI applications Carbolite Gero offers a sample weighing modification for many of its standard products. This is commonly used to determine selected characteristics of materials that exhibit either mass loss or gain due to decomposition, oxidation, or loss of volatiles such as moisture.

For thermogravimetric analysis the weight change of the sample must be continually monitored during the heating process. Custom designed products can also incorporate an integrated balance for loss on drying, loss on ignition and thermogravimetric analysis.

In this article Part 1 , we will explain what the terms mean and discuss some of the techniques used to determine these quantities. Water present in the atmosphere is referred to as humidity. As shown in Figure 1, moisture content or water content can be determined by gravimetric, chemical, or physical methods. Gravimetric methods measure changes in mass of a sample after or during a defined temperature program using a balance.

Whether this is exclusively water or whether other volatile substances or even decomposition products are released cannot be determined without further analysis. Gravimetrically determined moisture contents depend on the temperature program used and to a lesser extent on the relative humidity and pressure in the drying oven. Socalled LOD analyses are always carried out using gravimetric methods; these methods always determine the total volatile content.

Moisture content, water content, loss on drying, Part 1: What exactly is meant and how are these quantities determined?