Instrumental Analytical Chemistry

Robinson, James W.; Frame, Eileen M. Skelly; Frame, George M.

doi:10.1201/b21879

Cited by 9 publications

(22 citation statements)

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“…Spectroscopy is a valuable technique in analytical chemistry and forensic science . Ultraviolet–visible (UV–vis) spectroscopy is used widely in chemical research and in biochemical, environmental, and pharmaceutical laboratories . Quality and impurities are commonly assessed using UV–vis spectroscopy in the food and beverage industry .…”

Section: Introductionmentioning

confidence: 99%

“…Ultraviolet–visible (UV–vis) spectroscopy is used widely in chemical research and in biochemical, environmental, and pharmaceutical laboratories . Quality and impurities are commonly assessed using UV–vis spectroscopy in the food and beverage industry . Quantitative determination of DNA and RNA can also be accomplished using such data together with the known optical properties of these molecules at the wavelengths of interest …”

Section: Introductionmentioning

confidence: 99%

“…Quality and impurities are commonly assessed using UV–vis spectroscopy in the food and beverage industry . Quantitative determination of DNA and RNA can also be accomplished using such data together with the known optical properties of these molecules at the wavelengths of interest …”

Section: Introductionmentioning

confidence: 99%

“…The precise structure of a molecule determines the wavelengths of electromagnetic radiation that can be absorbed or emitted. − Generally, incident UV–vis light results in molecules being excited to a higher-energy state, and when they then relax toward their ground-state, light may also be emitted . The wavelengths of light absorbed or emitted correspond to the differences in energy between the relevant energy states, and thus the relative amount of light absorbed at each wavelength is unique to each individual chemical species …”

Section: Introductionmentioning

confidence: 99%

“…When light passes through a sample that has not been previously excited, the transmitted intensity for any particular narrow band of wavelengths, I , is less than the corresponding incident intensity, I 0 . The absorbance at each wavelength, A , which is unitless, is defined by the following, where the logarithm base-10 is usually used: Beer’s law states the equivalence between this absorbance and the product of the path length of the light through the sample, l ; the species concentration, c ; and its attenuation coefficient at that wavelength, ε: and thus a given path length of a particular species reflects a linear relationship between absorbance and species concentration. This applies provided that uniform solutions are prepared, stray light is negligible, and the species concentration is not so high that intermolecular interactions result in collective behaviors such as clustering.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Accurate, Photoresistor-Based, Student-Built Photometer and Its Application to the Forensic Analysis of Dyes

2019

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Student-built photometers are recognized as being useful tools in teaching laboratories that help students understand the concepts behind experimental measurements, and several devices have been reported that employ photoresistors as the detector of choice. We demonstrate here an improvement over these instruments and the analyses thereof, providing more rapid deployment in the laboratory and also considerable increases in both linearity and accuracy. This was confirmed by conducting quantitative absorption spectroscopy of known concentrations of potassium permanganate solution. A laboratory exercise utilizing this approach was employed in two postsecondary institutions to simulate the forensic analysis of unknown fabric dyes to determine the identity and concentration of an unknown dye solution.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Accurate, Photoresistor-Based, Student-Built Photometer and Its Application to the Forensic Analysis of Dyes

2019

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A novel Hercynite‐supported tetradentate Schiff base complex of manganese catalyzed one‐pot annulation reactions

Mohammadi

Ghorbani‐Choghamarani

2022

Applied Organom Chemis

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The present study is the first report on the synthesis and catalytic performance of Hercynite nanoparticles capped with a novel Schiff base–manganese(II) complex brought from a synthetic procedure. The solid support and the catalyst were characterized using various analytical techniques. The characterization results suggest excellent dispersibility, stability, high Mn content under the catalyst surface, and small size of catalyst, which leads to excellent catalytic activity and selectivity. Moreover, the catalyst proved to be sustainable and recyclable for rapid synthesis of various chromene‐ and pyran‐annulated heterocycles under ambient conditions. The effect of various crucial catalytic parameters was investigated and optimized. The scope of the reaction was extended to various aryl aldehydes and keto–enol tautomeric pairs (2‐hydroxy‐1,4‐naphthoquinone or dimedone), and the corresponding 2‐amino‐3‐cyano‐4H‐chromene and 2‐amino‐3‐cyano‐4H‐pyran products were obtained with excellent yield (82–99%) and at low reaction time (10–115 min). Significantly, the catalyst indicated magnetic, cost‐effective, and nontoxic properties, which result in having high recycling efficiency (5 cycles).

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A Problem-Based Approach to Teaching the Internal Standard Method by ATR-FTIR Spectroscopy

et al. 2022

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The ability of students to perform quantitative analysis is a fundamental aspect of analytical chemistry courses and laboratories. In this laboratory experiment, students quantitatively analyze both liquid and solid samples through the use of internal standard calibration and ATR-FTIR spectroscopy. Using a problem-based approach to selecting their internal standards, students gain a deeper understanding of the internal standard method of calibration and the process of selecting appropriate standards for the analysis of sodium benzoate and acetophenone. This experiment allows students to explore the internal standard method of calibration under a wider context of quality control and quality assurance as they frame their quantitative analyses through both internal and external quality assurance testing methods. In a survey of students undertaking this experiment, most students responded that the experiment provided them with a better understanding of the internal standard method of calibration, and the selection of internal standards, and offered them an opportunity to gain hands-on experience with ATR-FTIR spectroscopy.

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Instrumental Analytical Chemistry

Cited by 9 publications

References 0 publications

Accurate, Photoresistor-Based, Student-Built Photometer and Its Application to the Forensic Analysis of Dyes

Accurate, Photoresistor-Based, Student-Built Photometer and Its Application to the Forensic Analysis of Dyes

A novel Hercynite‐supported tetradentate Schiff base complex of manganese catalyzed one‐pot annulation reactions

A Problem-Based Approach to Teaching the Internal Standard Method by ATR-FTIR Spectroscopy

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