Water Content Analysis
Water Content Analysis - Related Videos
15:04
A Neuronal and Astrocyte Co-Culture Assay for High Content Analysis of Neurotoxicity
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Cited by 46 •
2009
This article describes a novel protocol and reagent set designed for sensitive measurement of neurotoxic effects of compounds and treatments on co-cultures of neurons and astrocytes using high content analysis. Results demonstrate that high content analysis represents an exciting novel technology for neurotoxicity assessment.
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...
08:17
Water Quality Analysis via Indicator Organisms
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2023
Source: Laboratories of Dr. Ian Pepper and Dr. Charles Gerba -The University of Arizona Demonstrating Author: Luisa Ikner Water quality analysis monitors anthropogenic influences such as pollutants, nutrients, pathogens, and any other constituent that can impact the water’s integrity as a resource. Fecal contamination contributes microbial pathogens that threaten plant, animal, and human health with disease or illness. Increasing water demands and strict quality standards require that water...
07:44
Analysis of Fatty Acid Content and Composition in Microalgae
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Cited by 207 •
2013
A method for the determination of fatty acid content and composition in microalgae based on mechanical cell disruption, solvent based lipid extraction, transesterification, and quantification and identification of fatty acids using gas chromatography is described. A tripentadecanoin internal standard is used to compensate for the possible losses during extraction and incomplete transesterification.
08:31
The Calibration and Use of Capacitance Sensors to Monitor Stem Water Content in Trees
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Cited by 31 •
2017
The hydraulic capacitance of biomass is a key component of the vegetation water budget, which serves as a buffer against short and long-term drought stresses. Here, we present a protocol for the calibration and use of soil moisture capacitance sensors to monitor water content in the stems of large trees.
FAQs
Karl Fischer analysis relies on a stoichiometric reaction in which water reacts with iodine, sulfur dioxide, an alcohol, and a base. Because the reaction has a defined relationship between water and the reacting system, the measured endpoint can indicate the amount of water present. This chemical basis distinguishes the method from measurements based only on physical mass change.
An endpoint signals that the reaction has reached completion under the selected Karl Fischer conditions. It may be detected electrically or visually, providing an observable transition for determining when the titration should stop. This endpoint is essential because the analytical result depends on identifying the point at which the water-related reaction is complete rather than relying on an arbitrary stopping point.
Karl Fischer titration determines water through a specific chemical reaction and an electrical or visual endpoint. Gravimetric measurement instead uses controlled heating and infers moisture from the resulting mass loss. The distinction matters because one approach is reaction-based, whereas the other interprets a physical change, so the selected method should match the sample and the intended measurement context.
Moisture can change a sample’s composition, reactivity, stability, and performance, making water content more than a descriptive measurement. In analytical work, these effects can also influence results and complicate comparisons between samples. Measuring the amount of water helps researchers identify whether observed variation remains acceptable or signals a change that could compromise a formulation, material, or experiment.
The Karl Fischer reaction system contains iodine, sulfur dioxide, an alcohol, and a base, together with the water being measured. These components provide the chemical environment in which water participates in a stoichiometric reaction. An electrical or visual endpoint then identifies when the reaction is complete, allowing the determination to be tied to the reaction’s measured progress.
A gravimetric determination compares a sample’s mass before and after controlled heating. The observed mass loss is then used to infer the moisture content. Controlled heating is important because the interpretation depends on attributing the measured loss to water under the selected conditions. This approach provides a physical basis for assessing moisture without using the Karl Fischer reaction system.
The measurement supports several stages of chemical work, including raw-material characterization, formulation control, moisture specification, and stability assessment. Researchers and manufacturers can use the results to compare materials, check whether moisture remains within an intended range, and identify changes that may affect composition, reactivity, stability, or final product performance.