Statistical Comparison of Three Methods for Determining Organic Peroxides

Ricciuti, Constantine; Coleman, Joseph E.; Willits, C. O.

doi:10.1021/ac60099a022

Cited by 26 publications

(9 citation statements)

References 13 publications

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“…Linstead, Burstall, and Wells (8) have shown that solvents containing low molecular weight ketones, water, and acid are satisfactory for iron, cobalt, nickel, and manganese separations. Results of our separations are in agreement with those of Linstead et al (8). However, our studies with solvents containing aliphatic alcohols and hydrochloric acid were successful, contrary to previous findings (8).…”

supporting

confidence: 90%

Spectrophotometric Determination of Hydroperoxide in Diethyl Ether.

Wolfe¹

1962

Anal. Chem.

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With solvent mixtures containing alcohols (Table I), Rt values decrease with increase in the molecular weight of the alcohol added (4, 8). No movement of the ions occurred with pentanolchloroform mixtures.Butanol and 2-propanol aided in the slight movement of cobalt and iron only (Table I).Solvent mixtures 14 and 16 containing ketones gave better movement for the cations.Acetone mixtures gave a reasonable R¡ value for iron(III) only.However, the presence of 2-butanone aided in the migration of all four cations. With this solvent, cobalt and nickel gave greater Rf values than iron and copper, because the nitrates of cobalt and nickel form complexes with 2butanone (8).The presence of hydrochloric acid modified the migration tendencies of the ions in each case (Table I), and helped to give constant and reproducible R/ values. When hydrochloric acid was used, iron had an R¡ value of 1.0 in all cases. The R¡ values decreased in the following sequence when acid-containing solvents were employed: Fe > Cu > Co > Ni. (Chloroformmethanol and chloroform-acetone systems were exceptions.)An improved acidic titanium reagent for determining hydroperoxide is described. The reagent is used to determine hydrogen peroxide, ferf-butyl hydroperoxide, 1 -ethoxyethyl hydroperoxide, and the unknown peroxide resulting from the oxidation of diethyl ether on storage or on exposure to ultraviolet radiation.1 -Ethoxyethyl hydroperoxide has been postulated as a product of the oxidation of diethyl ether in air. Samples of diethyl ether, which had been oxidized in storage or by exposure to ultraviolet radiation, are analyzed by the acidic titanium method, using the improved reagent, and by an iodometric method, and the results are compared. Residues from the evaporation of oxidized ether are analyzed in an attempt to identify the oxidation products. Rscent publications (7, 10) show a renewed interest in the acidic titanium method (8, 9) for hydrogen peroxide and various organic andThe addition of phenol to an organic solvent enhanced the polarity and acidity simultaneously. Hence, Rt values for the cations increased in its presence.

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confidence: 90%

Spectrophotometric Determination of Hydroperoxide in Diethyl Ether.

Wolfe¹

1962

Anal. Chem.

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“…Ricciuti et al (78) compared the polargraphic method with the Wheeler iodine and stannous chloride chemical methods~ These three methods gave results which were not significantly different for high purity hydroperoxide, but with impure products, the polarographic method may give more reliable values because it is more specific than the chemical procedures.…”

Section: Polarographymentioning

confidence: 99%

Measurement of lipid oxidation: A review

Gray

1978

J Americ Oil Chem Soc

645

380

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Lipids become rancid as a result of oxidation, and this oxidative rancidity is a major cause of food deterioration. The acceptability of a food product depends on the extent to which this deterioration has occurred. Thus some criterion for assessing the extent of oxidation is required. This paper reviews the experimental techniques for the measurement of lipid oxidation. The spectrum of tests ranges from simple organoleptic evaluations to chemical and physical methods. There is no ideal chemical method which correlates well with changes in organoleptic properties of oxidized lipids throughout the entire course of autoxidation. The methods discussed each give information about particular stages of the autoxidative process, and some are more applicable to certain lipid systems than others. The method of choice depends on a number of factors including the nature and history of the oxidized sample, the type of information required, the time available, and the test conditions. Clearly, there is a need for a more thorough assessment of the available methods so that unreliable, cumbersome methods may be discarded and modifications made to the remaining methods to maximize the information obtained. The ultimate criterion for the suitability of any test is its agreement with sensory perception of rancid flavors and odors.

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“…14, Chapter 6. (16) Hellsing, K. Automated Immunoanalysis; Richie, R. F., Ed. ; Mercel Dekker: New York, 1978; Part 1, Chapter 3.…”

Section: Literature Citedmentioning

confidence: 99%

“…In choosing to develop an iodometric method rather than one of the alternatives, we were influenced by the fact that iodometry is usually the ultimate calibration method for H202 standards in the laboratory (16)(17)(18). Furthermore, the equipment needed is reasonably portable and also often available in water analysis laboratories because of its use in the determination of chlorine.…”

Section: Literature Citedmentioning

confidence: 99%