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: A rapid, simple and sensitive method for the spectrophotometric determination of Hostacycline and Doxycycline is developed based on a fast colour reaction between these drugs and thorium (IV).
Abstract: A rapid, simple and sensitive method for the spectrophotometric determination of Hostacycline and Doxycycline is developed. The method is based on a fast colour reaction between these drugs and thorium (IV). This method has been successfully applied for determination of the metal as well as the drugs in pharmaceutical formula
6 citations
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TL;DR: In this paper, a new, sensitive and selective method for separation, and extraction - spectrophotometric determination of V (V) with pyrogallol {Ar (OH)3} and hydroxyamidines (HOA) is described.
Abstract: A new, sensitive and selective method for separation, and extraction - spectrophotometric determination of V (V) with pyrogallol {Ar (OH)3} and hydroxyamidines (HOA) is described. The molar absorptivities of the colored species with six substituted HOA lie in the range of (0.52–1.5)x 106 L mole−1 cm−1 at λmax 430–440 nm. Of these, the simplest compound, N-hydroxy-N, N- diphenylbenz-amidine (HDPBA) gives the most sensitive color reaction and hence, it is used for detailed studies. No interference of almost all diverse ions tested is noticed. The method offers the determination of vanadium in different environmental samples.
6 citations
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TL;DR: A new rapid, sensitive and selective method for the spectrophotometric determination of a trace of mercury (II) by solvent extraction based on the formation of an ion-pair complex between the tribromo-mercury(II) complex anion and the dyestuff cation obtained by oxidation of variamine blue B.
Abstract: A new rapid, sensitive and selective method is proposed for the spectrophotometric determination of a trace of mercury (II) by solvent extraction. The method is based on the formation of an ion-pair complex between the tribromo-mercury(II) complex anion and the dyestuff cation obtained by oxidation of variamine blue B. The optimum pH range for the color reaction is 2.5–4. The blue complex can be extracted into nitrobenzene and has a maximum absorption at 605 mμ in the organic solvent. Beer’s law holds in the range 3.2×10−6−2.2×10−5 M of mercury(II) in the aqueous layer before the extraction, with a molar absorptivity of 4.03×104 mol−1cm−1 l at 605 mμ. The color reaction is instantaneous and the complex remains stable 15 mintes in the nitrobenzene layer. Of the 22 cations and 11 anions examined, tin(II), tin(IV), antimony (III), iodide, cyanide, and thiocyanate showed serious interferences.
6 citations
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TL;DR: Silver gives a colour reaction with cadion 2B in the presence of the non-ionic surfactant Triton X-100, and the suppression of the colour by competitive complexation of the silver can be used for the spectrophotometric determination of cyanide.
6 citations