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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TL;DR: In this article, a Spectrophotometric method for the determination of p-phenylenediamine in hair dyes is described, which obeys Beer's law (1 to 10μg/ml).
Abstract: Cupric chloride-triphenylphosphine complex gives red color witho-phenylenediamine having maximum absorption at 505–520 nm and 0.5μg/ml as visual limit of identification. The reaction is specific foro-phenylenediamine and obeys Beer's law (1 to 10μg/ml). This reaction provides the basis of a new method for the Spectrophotometric determination ofo-phenylenediamine inμg quantities. Ruthenium trichloride-triphenylphosphine complex gives blue color withp-phenylenediamine having maximum absorption at 580 nm and 2μg/ml as visual limit of identification. On the basis of this color reaction a Spectrophotometric method for the determination ofp-phenylenediamine in hair dyes is described. The recovery of the dye from commercial preparations is better than 97%. Other organic compounds do not interfere.
1 citations
TL;DR: A color reaction between polyamines and ο-hydroxyhydroquinonephthalein-copper(II) complex, and conditions for the determination of spermine or spermidine were studied.
Abstract: A color reaction between polyamines and ο-hydroxyhydroquinonephthalein-copper(II) complex, and conditions for the determination of spermine or spermidine were studied. The apparent molar absorptivities at 585 nm were 7.0 × 10 5 1 mol-1 cm -1 for spermine and 3.0 × 105 1 mol-1 cm-1 for spermidine, respectively.
1 citations
Journal Article•
1 citations
Journal Article•
1 citations
TL;DR: In this article, a color reaction of phenols with diazotized 4-nitroaniline and micellar extraction of the products of their interaction (azo compound) was used for the determination of phenol and resorcinol at the MPC level.
Abstract: We studied the extraction and preconcentration of phenol and its hydroxy derivatives using individual and mixed micelles of nonionic and cationic surfactants with the digital recording of the analytical signal. This approach is based on the color reaction of phenols with diazotized 4-nitroaniline and micellar extraction of the products of their interaction (azo compound). The micellar extraction parameters (pH, the concentration of reagents, NaOH, and ethanol) were optimized for the efficient extraction of azo compounds of the studied phenols. The proposed method enables the determination of phenol and resorcinol at the MPC level with an error not exceeding 10%. For a qualitative assessment of the presence of phenols, the geometric parameters (area S, perimeter P) of the corresponding radar plots were used along with colorimetric parameters (R, G, B). The calibration dependences are linear within 1 × 10–7–3 × 10–5 M for phenol and 1 × 10–7–2 × 10–5 M for resorcinol and phloroglucinol. The developed colorimetric method was tested in the determination of resorcinol in the Rezortsinol pharmaceutical preparation.
1 citations