Portable Analysis Method

What are the official methods of moisture content determination?

The official methods of moisture content determination are standardized procedures developed and approved by recognized organizations to ensure accurate and reliable results. These methods are typically used in various industries, including agriculture, food processing, construction, and environmental monitoring. Here are the common official methods for determining moisture content:

1. Oven Drying Method

• The sample is weighed and placed in an oven at a specified temperature for a specific amount of time.
• The sample is then removed from the oven and re-weighed, and the moisture content is calculated based on the weight loss.

2. Karl Fischer Titration

• A solution containing Karl Fischer reagent is added to the sample until the moisture content is completely consumed.
• The amount of reagent used is measured through a titration process, and the moisture content is determined based on the stoichiometry of the reaction.

3. Microwave Drying Method

• The sample is placed in a microwave oven and heated until the moisture is evaporated.
• The moisture content is calculated based on the weight loss and the time taken for evaporation.

4. Infrared Drying Method

• The sample is exposed to infrared radiation, which causes the moisture to evaporate.
• The moisture content is calculated based on the amount of infrared radiation absorbed by the sample.

5. Capacitance Method

• A capacitance sensor is placed in contact with the sample, and the capacitance change due to moisture content is measured.
• The capacitance change is correlated to the moisture content, allowing for a direct measurement.

6. Nuclear Magnetic Resonance (NMR)

• A sample is placed in an NMR spectrometer, and the hydrogen atoms in the sample are excited by radio waves.
• The relaxation time of the hydrogen atoms is measured based on their interaction with water molecules, and the moisture content is calculated from the relaxation time.

The choice of the official method for moisture content determination depends on factors such as the type of material, accuracy requirements, and available resources. These methods provide reliable and accurate results, ensuring the proper characterization of materials for various applications.