Spectrophotometric Determination of Traces of Peroxides in Organic Solvents.

Banerjee, Debjyoti; Budke, Christoph

doi:10.1021/ac60210a027

Cited by 80 publications

(49 citation statements)

References 23 publications

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“…Moreover, the tert-butyl group is known to protect neighbouring atoms sterically. Di-tert-butyl peroxide being stabilised by two tertiary aliphatic groups is known to be not reactive at all in the iodometric reaction (Banerjee and Budke, 1964). We conclude that we can only measure reactive peroxides quantitatively.…”

Section: Data Acquisitionmentioning

confidence: 76%

“…In contrast, sterically protected and electronically stabilised peroxide species can not be captured quantitatively within 60 min even at an elevated temperature of 40 • C. This shows the limitation of the iodometric peroxide quantification and underlines the importance of a constant reaction temperature to assure the comparability of all measured absorbance values. Banerjee and Budke (1964) quantified peroxide residues in organic solvents via iodometry/photometry in acetic acid/chloroform (2:1 by volume). Recent studies about the quantification of peroxides in aerosol particles used ethyl acetate (Docherty et al, 2005), ethyl acetate/methanol (1:1 by volume) (Surratt et al, 2006) or water (Nguyen et al, 2010) for particle extraction.…”

Section: Reaction Time Of Triiodide Formationmentioning

confidence: 99%

“…We used iodometry for quantification of the total peroxide content (Banerjee and Budke, 1964). This method was already applied in other studies to measure the peroxide content of aerosols (Docherty et al, 2005;Ziemann, 2005;Surratt et al, 2006;Nguyen et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Development of a sensitive long path absorption photometer to quantify peroxides in aerosol particles (Peroxide-LOPAP)

et al. 2012

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Abstract.A new off-line instrument to quantify peroxides in aerosol particles using iodometry in long path absorption spectroscopy has been developed and is called peroxide long path absorption photometer (Peroxide-LOPAP). The new analytical setup features important technical innovations compared to hitherto published iodometric peroxide measurements. Firstly, the extraction, chemical conversion and measurement of the aerosol samples are performed in a closed oxygen-free (∼ 1 ppb) environment. Secondly, a 50-cm optical detection cell is used for an increased photometric sensitivity. The limit of detection was 0.1 µM peroxide in solution or 0.25 nmol m −3 with respect to an aerosol sample volume of 1 m 3 . The test reaction was done at a constant elevated temperature of 40 • C and the reaction time was 60 min.Calibration experiments showed that the test reaction with all reactive peroxides, i.e. hydrogen peroxide (H 2 O 2 ), peracids and peroxides with vicinal carbonyl groups (e.g. lauroyl peroxide) goes to completion and their sensitivity (slope of calibration curve) varies by only ±5 %. However, very inert peroxides have a lower sensitivity. For example, tert-butyl hydroperoxide shows only 37 % sensitivity compared to H 2 O 2 after 1 h. A kinetic study revealed that even after 5 h only 85 % of this inert compound had reacted.The time trends of the peroxide content in secondary organic aerosol (SOA) from the ozonolysis and photooxidation of α-pinene in smog chamber experiments were measured. The highest mass fraction of peroxides with 34 % (assuming a molecular weight of 300 g mol −1 ) was found in freshly generated SOA from α-pinene ozonolysis. Mass fractions decreased with increasing NO levels in the photooxidation experiments. A decrease of the peroxide content was also observed with aging of the aerosol, indicating a decomposition of peroxides in the particles.

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Section: Data Acquisitionmentioning

confidence: 76%

Section: Reaction Time Of Triiodide Formationmentioning

confidence: 99%

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Development of a sensitive long path absorption photometer to quantify peroxides in aerosol particles (Peroxide-LOPAP)

et al. 2012

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“…The iodometric assay method based on the oxidation of sodium or potassium iodide followed by the spectrophotometric determination of the I 3-chromophore is most commonly used. 29 Another widespread method is based on the formation of complexes of ferric ions by the oxidation of ferrous ions. One method proposes the spectrophotometric determination of these complexes upon reaction in an acidic a In the first tideline (TL1) and in two subsequent tidelines (TL2 and TL3) produced successively with no lag time and on the same sheet of paper.…”

Section: Hydroperoxide Quantitationmentioning

confidence: 99%

Formation of Brown Lines in Paper: Characterization of Cellulose Degradation at the Wet−Dry Interface

2008

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Brown lines were generated at the wet-dry interface on Whatman paper No. 1 by suspending the sheet vertically in deionized water. Formic acid and acetic acid were quantified in three areas of the paper defined by the wet-dry boundary (above, below, and at the tideline) using capillary zone electrophoresis with indirect UV detection. Their concentration increased upon accelerated aging of the paper and was highest in the tideline. The hydroperoxides have been quantified using reverse phase high performance liquid chromatography with UV detection based on the determination of triphenylphosphine oxide produced from the reaction with triphenylphosphine, and their highest concentration was found in the tideline as well. For the first time, it was shown that various types of hydroperoxides were present, water-soluble and non-water-soluble, most probably in part hydroperoxide functionalized cellulose. After accelerated aging, a significant increase in hydroperoxide concentration was found in all the paper areas. The molar masses of cellulose determined using size-exclusion chromatography with multiangle light scattering detection showed that, upon aging, cellulose degraded significantly more in the tideline area than in the other areas of the paper. The area below the tideline was more degraded than the area above. A kinetic study of the degradation of cellulose allowed determining the constants for glycosidic bond breaking in each of the areas of the paper.

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“…MHP stock solutions were calibrated by reaction with iodide. Iodine liberated by the reaction was determined spectrophotometrically following the procedure of Banerjee and Budke (1964). H 2 O 2 stock solutions were made by dilution of a 30-35% H 2 O 2 solution obtained from Sigma-Aldrich.…”

Section: Compound Synthesis and Standardizationmentioning

confidence: 99%

Photochemical production of hydrogen peroxide and methylhydroperoxide in coastal waters

et al. 2005

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Spectrophotometric Determination of Traces of Peroxides in Organic Solvents.

Cited by 80 publications

References 23 publications

Development of a sensitive long path absorption photometer to quantify peroxides in aerosol particles (Peroxide-LOPAP)

Development of a sensitive long path absorption photometer to quantify peroxides in aerosol particles (Peroxide-LOPAP)

Formation of Brown Lines in Paper: Characterization of Cellulose Degradation at the Wet−Dry Interface

Photochemical production of hydrogen peroxide and methylhydroperoxide in coastal waters

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