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Related Concept Videos

Instrument Calibration01:12

Instrument Calibration

Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
Analytical Balance Calibration
An analytical balance measures mass and requires regular calibration to...
Quantitative Analysis01:12

Quantitative Analysis

Quantitative analysis is a technique for measuring the amount of specific constituents in a sample. When the sample's composition is unknown, qualitative analysis is performed first to identify its components, which ensures that the correct substances are measured during the quantitative phase.
In quantitative analysis, two key measurements are made: the sample quantity and a property proportional to the amount of the analyte (the substance being analyzed). This forms the basis of the method...
Calibration Curves: Linear Least Squares01:20

Calibration Curves: Linear Least Squares

A calibration curve is a plot of the instrument's response against a series of known concentrations of a substance. This curve is used to set the instrument response levels, using the substance and its concentrations as standards. Alternatively, or additionally, an equation is fitted to the calibration curve plot and subsequently used to calculate the unknown concentrations of other samples reliably.
For data that follow a straight line, the standard method for fitting is the linear...
Mass Analyzers: Overview01:13

Mass Analyzers: Overview

The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
Glassware Calibration01:11

Glassware Calibration

Accurate calibration of glassware, such as volumetric flasks, pipettes, and burettes, is essential to ensure accurate measurements in the analytical laboratory. Calibration helps maintain consistency across measurements and prevents errors arising from inaccurate volumes.
Volumetric flasks: Volumetric flasks are designed to prepare aqueous solutions of precise volumes accurately with a calibration line on the neck. To calibrate a volumetric flask, it is important to fill it with distilled...

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Split Point Analysis and Uncertainty Quantification of Thermal-Optical Organic/Elemental Carbon Measurements
10:22

Split Point Analysis and Uncertainty Quantification of Thermal-Optical Organic/Elemental Carbon Measurements

Published on: September 7, 2019

Principles of analytical calibration/quantification for the separation sciences.

Luis Cuadros-Rodríguez1, M Gracia Bagur-González, Mercedes Sánchez-Viñas

  • 1Department of Analytical Chemistry, University of Granada, E-18071 Granada, Spain. lcuadros@ugr.es

Journal of Chromatography. A
|April 3, 2007
PubMed
Summary

Analytical calibration establishes a measurement function to quantify analytes in samples. This study clarifies calibration methods and their impact on quantification, especially with separation techniques.

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Area of Science:

  • Analytical Chemistry
  • Metrology

Background:

  • Calibration is crucial for determining the metrological status of measurement systems.
  • In analytical sciences, calibration underpins the quantification of analytes and analytical parameters.

Purpose of the Study:

  • To establish the metrological foundations of analytical calibration and quantification.
  • To differentiate and discuss various calibration work schemes and methodologies.
  • To clarify terminology related to analytical calibration.

Main Methods:

  • Establishing metrological bases for analytical calibration.
  • Discussing different calibration work schemes and methodologies.
  • Analyzing the impact of separation techniques on calibration and quantification.

Main Results:

  • Defined the empirical relationship (measurement function) between analyte amount and analytical signal.
  • Distinguished and discussed calibration methods based on sample characteristics (analyte+matrix).
  • Clarified terms and nomenclature in analytical calibration.

Conclusions:

  • Analytical calibration is fundamental for accurate analyte quantification.
  • Methodologies vary based on sample complexity and analytical techniques.
  • Understanding calibration principles is essential for reliable analytical results, particularly when using separation techniques.