Topic
Color reaction
About: Color reaction is a research topic. Over the lifetime, 1194 publications have been published within this topic receiving 19579 citations.
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01 Sep 1990
6 citations
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TL;DR: The focus of this paper is to discuss the parameters necessary to develop a solid sorbent sampling-sensor which can be used to determine atmospheric ethanol.
6 citations
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TL;DR: In this article, the color reaction between aromatic amines and chloranil was studied spectrophotometrically, and a 1 : 1 adduct formed in solution, with some dissociation.
6 citations
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TL;DR: In this article, a color reaction with a diamine, N,N-dimethyl-p-phenylenediamine, in a methanol-benzene solution was determined quantitatively by a color transformation with the diamine.
Abstract: Chemical changes occurring in thermoset polyesters during exposure to solar and carbon-arc radiant energy were determined quantitatively by a color reaction with a diamine, N,N-dimethyl-p-phenylenediamine, in a methanol–benzene solution. The amount of diamine reacting with a specimen and the color change of the treated specimen, as measured by differential reflectance, varied directly with exposure time. Three commercial polyesters (glass fiber-reinforced) exposed under identical conditions showed widely different degradation rates as measured by the amount of N,N-dimethyl-p-phenylenediamine used per specimen. The relative stability of the three materials was independent of irradiation source. The color of the treated specimen was dependent on exposure time.
6 citations
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TL;DR: The cloud-point extraction process using micelle of the cationic surfactant CTAB to extract Fe3+and Pb2+ from aqueous solutions was investigated and the analytical characteristics of the method (e.g., limit of detection, linear range, preconcentration and improvement factors) were obtained.
Abstract: A cloud-point extraction process using micelle of the cationic surfactant CTAB to extract Fe3+and Pb2+ from aqueous solutions was investigated. The method is based on the color reaction of Fe3+and Pb2+ with bromopyrogallol red at pH 5.0 and micelle-mediated extraction of the complex. The optimal extraction and reaction conditions (e.g., surfactant concentration, reagent concentration and effect of time) were studied and the analytical characteristics of the method (e.g., limit of detection, linear range, preconcentration and improvement factors) were obtained. Linearity was obeyed in the range of 0.05-43.00 ng mL-1 of Fe3+ ion and 0.10-40.00 ng mL-1 of Pb2+ ion and the detection limit of the method was 0.020 and 0.040 ng mL-1 for Fe3+ and Pb2+, respectively. The interference effect of some anions and cations was also tested. The method was applied to the determination of Fe3+ and Pb2+ in vegetable (lettuce, spinach, cabbage, parsley, and dill), tea, rice, human hair, liver, and chicken and water samples.
6 citations