Mass Concentration Measurement
Mass Concentration Measurement - Related Videos
08:51
Understanding Concentration and Measuring Volumes
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2023
Solutions are utilized to some degree in almost all biological research applications. Therefore understanding how to measure and manipulate them is imperative to any experiment. In this video, concepts in preparing solutions are introduced. Solutions consist of a solute dissolved in solvent to yield a homogeneous mixture of molecular substances. Solutions are generally identified by their components and corresponding concentrations. Concentrated solutions are diluted through various...
08:00
Measuring Mass in the Laboratory
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2023
The analytical balance is the common piece of equipment in the scientific laboratory. These highly precise instruments can measure down to ten thousandths or even hundred thousandths of a gram. The triple beam balance is a type of scale that uses counterweights on a three rider beams to counterbalance the sample in the pan. On the other hand, modern analytical balances use a complex system of electronic sensors to accurately mass a substance. The analytical balance is so sensitive that it...
01:23
Drug Concentrations: Measurements
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2024
Drug concentration is the quantity of a drug present in a biological sample. Measuring drug amounts in biological samples allows the clinician to understand how a drug is absorbed, distributed, metabolized, and excreted. Samples can be obtained through invasive or non-invasive methods. Invasive techniques involve surgical or parenteral interventions to gather blood, cerebrospinal fluid, or tissue biopsy. Conversely, non-invasive approaches provide samples like urine, feces, and saliva. Plasma —...
13:35
Mass Conservation and Flow Rate Measurements
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2023
Source: Ricardo Mejia-Alvarez and Hussam Hikmat Jabbar, Department of Mechanical Engineering, Michigan State University, East Lansing, MI The purpose of this experiment is to demonstrate the calibration of a flow passage as a flowmeter using a control volume (CV) formulation [1, 2]. The CV analysis focuses on the macroscopic effect of flow on engineering systems, rather than the detailed description that could be achieved with a detailed differential analysis. These two techniques should be...
09:49
Solutions and Concentrations
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2023
Source: Laboratory of Dr. Michael Evans — Georgia Institute of Technology A solution is a homogeneous mixture containing some components in small amounts, called solutes, and one component in a large amount, called the solvent. Solid-liquid solutions contain one or more solid solutes dissolved in a liquid solvent. Solutions are ubiquitous in chemistry: they are used to store and handle small amounts of material, carry out chemical reactions, and develop materials with controllable properties.
FAQs
It places the amount of a solute, biomolecule, cell-derived material, or suspended particle on a common volume basis. This allows researchers to compare samples even when their total volumes differ, provided the measurements use consistent units and defined sample volumes. Such normalization helps distinguish biological differences from simple differences in sample quantity.
Consistent units prevent apparent differences that arise only from reporting scale. Values expressed in grams per liter, milligrams per milliliter, or another agreed unit can be compared only after the units are aligned. Careful unit selection also supports accurate reagent and culture-medium preparation, where an incorrect conversion can change the intended amount added to a defined volume.
Dilution extends measurement to samples whose original amount may not be directly suitable for analysis, but the dilution must be incorporated when calculating the original concentration. Calibrated analytical assays connect a measured signal to a known amount of material. Together, appropriate dilution and calibration help produce values that are interpretable across samples and experimental conditions.
Accurate values make biological responses easier to interpret quantitatively. If concentration estimates are inconsistent, an apparent change between experimental conditions may reflect preparation or measurement differences rather than a biological effect. Reliable measurements therefore strengthen reproducibility, support meaningful sample normalization, and provide a sound basis for comparing the abundance of proteins, nucleic acids, or other sample components.
First, identify the material being measured and define the sample volume. Next, determine the material amount by weighing, dilution-based calculation, or a calibrated analytical assay, depending on the sample and available measurement approach. Finally, express the result using a consistent mass-per-volume unit and apply any relevant dilution adjustment before comparing samples or preparing reagents.
The measurement is useful when preparing culture media and reagents, normalizing biological samples, or assessing the abundance of proteins and nucleic acids. It also supports comparisons between experimental conditions by expressing sample material on a shared volume basis. These applications make concentration data relevant to both routine laboratory preparation and quantitative interpretation of biological experiments.
They provide a quantitative way to specify how much material should be present in a defined preparation volume. Researchers can use weighing, dilution, or a calibrated assay to establish the intended amount, then report it in a consistent unit. This approach improves reproducibility because independently prepared media or reagents can be matched to the same concentration target.