Water Content Determination
Water Content Determination - Related Videos
06:16
Determination of Moisture Content in Soil
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2023
Source: Laboratories of Dr. Ian Pepper and Dr. Charles Gerba - The University of Arizona Demonstrating Author: Bradley Schmitz Soils normally contain a finite amount of water, which can be expressed as the “soil moisture content.” This moisture exists within the pore spaces in between soil aggregates (inter-aggregate pore space) and within soil aggregates (intra-aggregate pore space) (Figure 1). Normally this pore space is occupied by air and/or water. If all the pores are occupied by air, the...
07:04
Determination of the Glycogen Content in Cyanobacteria
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Cited by 26 •
2017
Here, we present a reliable and easy assay to measure the glycogen content in cyanobacterial cells. The procedure entails precipitation, selectable depolymerization, and the detection of glucose residues. This method is suitable for both wildtype and genetically engineered strains and can facilitate the metabolic engineering of cyanobacteria.
01:19
Body Water Content and Fluid Compartments
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2024
Life's biochemical processes occur within aqueous solutions. Solutes are substances that are dissolved within these solutions. The human body contains a variety of solutes, which can differ across various body parts. These can encompass proteins—such as those responsible for clotting and carbohydrate transport—as well as electrolytes. In medicine, an electrolyte is often described as a mineral ion derived from a salt possessing an electric charge. Examples include sodium ions (Na+) and chloride...
05:42
Using a Sandwich ELISA to Determine the Immunogenic Glycoprotein Content in a Vaccine
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2025
This video showcases an indirect enzyme-linked immunosorbent assay or ELISA sandwich immunocapture assay designed to assess immunogenic glycoprotein levels in vaccines. The assay plate, containing glycoprotein-specific antibodies, is incubated with serially diluted vaccine samples, including reference and test vaccines, followed by immunoassay to quantify glycoprotein content in the test vaccine.
08:07
Spectrophotometric Determination of Phycobiliprotein Content in Cyanobacterium Synechocystis
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Cited by 42 •
2018
Here, we present a protocol to quantitatively determine phycobiliprotein content in the cyanobacterium Synechocystis using a spectrophotometric method. The extraction procedure was also successfully applied to other cyanobacteria and algae strains; however, due to variations in pigment absorption spectra, it is necessary to test the spectrophotometric equations for each strain individually.
FAQs
Controlled heating removes water from the sample, and the resulting mass loss provides the measurement. An analyst compares the sample’s mass before and after heating under specified conditions, attributing the change to water removed during the process. This approach is useful when the material can undergo controlled heating and when a mass-based result suits the analytical requirement.
Karl Fischer titration relies on a quantitative reaction between iodine and water in the sample under defined conditions. Because the reaction connects the amount of iodine involved with the water present, the method provides a chemical route to the measurement rather than relying on mass loss from heating. This makes reaction conditions central to obtaining a meaningful result.
The method should match the sample’s composition, physical state, and expected moisture level. Controlled heating may be selected when those characteristics allow water removal and mass-loss measurement, whereas Karl Fischer titration may be preferred when a reaction-based determination better fits the material or anticipated amount. Considering these factors helps align the procedure with the analytical purpose.
For a heating-based determination, the workflow centers on measuring mass before treatment, applying controlled heating to remove water, and measuring the mass afterward. The difference between the two measurements supplies the result. Maintaining the specified heating conditions is important because the procedure depends on consistent water removal and a comparable mass measurement.
A Karl Fischer procedure focuses on allowing iodine to react quantitatively with water in the sample under defined conditions, then using that reaction to determine the water amount. The key procedural concern is maintaining those conditions so the chemical relationship remains suitable for measurement and comparison. This distinguishes the approach from procedures based on heating and mass loss.
The measurement supports raw-material testing, formulation control, reaction monitoring, and compliance with product specifications. In research and industrial laboratories, analysts can use the result to evaluate whether a material meets a defined requirement or whether water content changes during formulation or chemical processing. Its value therefore extends from routine quality assessment to monitoring experimental and manufacturing processes.