Selective Measurement of Gaseous Hydrogen Peroxide with Light Emitting Diode-Based Liquid-Core Waveguide Absorbance Detector

Li, Jianzhong; Dasgupta, Purnendu Κ.

doi:10.2116/analsci.19.517

Cited by 23 publications

(8 citation statements)

References 38 publications

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“…24 Owing to its large molar absorptivity, the Ti-TPyP reagent can detect even a picomole level of hydrogen peroxide. In the determination of hydrogen peroxide in various real samples using this reagent, inorganic ions, amino acids, and proteins, 2,3,25 and organic hydroperoxides 26 were actually found to cause no significant interferences on the analytical results. Therefore the reagent is characterized by a very high sensitivity and specificity for hydrogen peroxide.…”

Section: Resultsmentioning

confidence: 90%

Ultraviolet—Visible Spectral Analysis for the Reaction of Hydrogen Peroxide with a Titanium(IV)-Porphyrin Reagent

Takamura

Matsumoto

2009

Appl Spectrosc

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A Ti-TPyP reagent, i.e., an acidic aqueous solution of oxo[5,10,15,20-tetra(4-pyridyl)porphyrinato]titanium(IV) complex, TiO(tpyp), was developed as a highly sensitive and selective spectrophotometric reagent for the determination of traces of hydrogen peroxide. The reagent exhibited a single absorption peak at 432 nm, and the addition of hydrogen peroxide to the reagent gave rise to a new peak at 450 nm, with height being proportional to the added hydrogen peroxide concentration. Recently we succeeded in clarifying the reaction specificity of the TiO(tpyp) complex to hydrogen peroxide from the viewpoint of the reaction mechanisms and molecular orbitals based on ab initio calculations. In the present study, we performed ultraviolet-visible (UV-Vis) spectral simulations for individual species in the proposed reaction mechanisms based on the theoretical calculations carried out using the Zerner's intermediate neglect of differential overlap (ZINDO) method, since the assignment of the observed absorption peaks to the respective reaction species is important to confirm the reliability of the analysis of hydrogen peroxide using the Ti-TPyP reagent. The absorption peaks at 432 nm and 450 nm were assigned to a H(2)O-adduct structure of the protonated TiO(tpyp) complex and the important structure corresponding to the monoperoxo TiO(tpyp) complex, respectively, under acidic conditions. Particularly, it should be noted that the addition of water molecules to the protonated TiO(tpyp) complex affects the maximum absorption wavelength appreciably. Taking the addition of water molecules to the complex into consideration, the reaction mechanism proposed previously was revised in this study. The results should contribute to providing a new way to evaluate analytical reagents.

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Section: Resultsmentioning

confidence: 90%

Ultraviolet—Visible Spectral Analysis for the Reaction of Hydrogen Peroxide with a Titanium(IV)-Porphyrin Reagent

Takamura

Matsumoto

2009

Appl Spectrosc

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“…Acetone reacts with salicylaldehyde in a concentrated NaOH medium to form a colored product-this has been used to measure breath acetone in FEP tube-based LCW cells (89). Similar measurements of gaseous H 2 O 2 have been made (90).…”

Section: General Applications Of Light Emitting Diode-based Absorbancmentioning

confidence: 99%

Light-Emitting Diodes for Analytical Chemistry

Macka

Piasecki

Dasgupta

2014

Annual Rev. Anal. Chem.

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114

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Light-emitting diodes (LEDs) are playing increasingly important roles in analytical chemistry, from the final analysis stage to photoreactors for analyte conversion to actual fabrication of and incorporation in microdevices for analytical use. The extremely fast turn-on/off rates of LEDs have made possible simple approaches to fluorescence lifetime measurement. Although they are increasingly being used as detectors, their wavelength selectivity as detectors has rarely been exploited. From their first proposed use for absorbance measurement in 1970, LEDs have been used in analytical chemistry in too many ways to make a comprehensive review possible. Hence, we critically review here the more recent literature on their use in optical detection and measurement systems. Cloudy as our crystal ball may be, we express our views on the future applications of LEDs in analytical chemistry: The horizon will certainly become wider as LEDs in the deep UV with sufficient intensity become available.

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“…Therefore, high sensitivity is obtained using absorbance methods even though they employ small optical devices such as a light emitting diode (LED) and a photodiode (PD). The long gas collection/absorbance cell tube was applied to the analysis of NO 2 and O 3 [27], Cl 2 , H 2 S, NO 2 and CO 2 [28], HONO and NO 2 [29], H 2 O 2 [30], and O 3 [31].…”

Section: Porous Tube Collector/detector and Liquid Core Waveguidementioning

confidence: 99%