Ftir Spectrophotometry
Ftir Spectrophotometry - Related Videos
01:16
Spectrophotometry: Introduction
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2024
Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material. The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...
10:06
Characterization Of Multi-layered Fish Scales (Atractosteus spatula) Using Nanoindentation, X-ray CT, FTIR, and SEM
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Cited by 15 •
2014
This paper presents the methods used for probing spatially correlated chemical, structural, and mechanical properties of the multilayered scale of Atractosteus spatula (A. spatula) using nanoindentation, Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and X-ray computed tomography (X-ray CT). The experimental results have been used to investigate the design principles of protective biological materials.
12:08
Monitoring the Reductive and Oxidative Half-Reactions of a Flavin-Dependent Monooxygenase using Stopped-Flow Spectrophotometry
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Cited by 12 •
2012
We describe the use of a stopped-flow instrument to investigate both the reductive and oxidative half-reactions of Aspergillus fumigatus siderophore A (SidA), a flavin-dependent monooxygenase. We then show the spectra corresponding to the species in the reaction of SidA and we calculate the rate constants for their formation.
12:48
Measuring Cation Transport by Na,K- and H,K-ATPase in Xenopus Oocytes by Atomic Absorption Spectrophotometry: An Alternative to Radioisotope Assays
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Cited by 7 •
2013
We describe a method to quantify the activity of K+-countertransporting P-type ATPases by heterologous expression of the enzymes in Xenopus oocytes and measuring Rb+ or Li+ uptake into individual cells by atomic absorption spectrophotometry. The method is a sensitive and safe alternative to radioisotope flux experiments facilitating complex kinetic studies.
08:11
Infrared Spectroscopy
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2023
Source: Vy M. Dong and Zhiwei Chen, Department of Chemistry, University of California, Irvine, CA This experiment will demonstrate the use of infrared (IR) spectroscopy (also known as vibrational spectroscopy) to elucidate the identity of an unknown compound by identifying the functional group(s) present. IR spectra will be obtained on an IR spectrometer using the attenuated total reflection (ATR) sampling technique with a neat sample of the unknown.
FAQs
The interferometer combines multiple infrared wavelengths into a composite signal before detection. A Fourier-transform calculation then converts the detector response into a spectrum that can be interpreted through molecular vibration patterns. This sequence allows one measurement to preserve chemically meaningful infrared information, which researchers can use to compare environmental samples and recognize substances through their spectral features.
Researchers examine characteristic absorption bands within the spectrum rather than relying on a single undifferentiated signal. The collection of bands forms a molecular fingerprint, allowing one compound or material to be distinguished from another when their absorption patterns differ. This pattern-based interpretation is especially useful when characterizing complex environmental samples containing multiple chemical substances.
The spectral pattern provides evidence about which chemical substances are present, while characteristic absorption bands can also support estimates of their concentrations. Identification depends on matching recognizable molecular features, whereas measurement uses the same absorption information to assess amount. Together, these capabilities let researchers characterize pollutants and evaluate chemical composition in environmental investigations.
The method can be applied to gases, airborne particles, water, soil, and organic pollutants. This range makes it relevant across atmospheric, aquatic, and terrestrial studies rather than limiting analysis to one sample category. Researchers can select it when they need chemical characterization of environmental materials associated with pollution monitoring, ecosystem change, or remediation.
Spectral fingerprints can help distinguish chemical substances found in environmental samples, providing evidence about the composition of pollution. Comparing the absorption patterns associated with gases, particles, water, soil, or organic pollutants can support source identification. This application connects chemical characterization with environmental investigations that seek to determine where contamination originates or how it changes.
Measurements provide information about the chemical substances present and, in some cases, estimates of their concentrations. Researchers can use these results to assess environmental contamination, examine potential changes in ecosystems, and evaluate whether remediation processes alter the chemical composition of affected samples. FTIR therefore contributes analytical evidence to both risk assessment and cleanup evaluation.