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The past is the future: from natural acid-base indicators to natural reagents in sustainable analytical chemistry

Pure and Applied Chemistry
This article reviews the use of natural resources in analytical chemistry throughout history. Plant extracts were employed as indicators in chemistry for identifying the acidity or alkalinity of liquids as early as the 1650s.
Pei Meng Woi, Chalermpong Saenjum, Kate Grudpan   +2 more
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Sensitized schiff's reagent as an acid-base indicator

Analytica Chimica Acta, 1954
Abstract The sensitized Schiff's reagent has been used as an indicator in the neutralization of strong acids by means of strong or weak bases. (1) Since the acid to alkali transition is much sharper than the reverse process, the titration is best done by adding alkali to the acid.
S.N. Bhattacharya, A. Ghose
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pH Indicators As Chemical Reagents for the Enhancement of Footwear Marks

Journal of Forensic Sciences, 1996
Abstract Enhancement of weak two-dimensional shoemarks is often necessary due to the poor image detail. Thiocyanate is regarded in the literature as the most effective reagent for the chemical enhancement of footwear marks. In this study we have examined the possibility of using pH indicators, Bromophenol Blue and Bromocresol Green, as ...
B Glattstein, Y Shor, N Levin, A Zeichner   +3 more
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Ion-Selective Optode Nanospheres as Heterogeneous Indicator Reagents in Complexometric Titrations

Analytical Chemistry, 2015
Traditionally, optical titrations of inorganic ions are based on a rapid and visible color change at the end point with water-soluble organic dyes as indicators. Adequate selectivity is required for both the indicator and the complexing agent, which is often limited.
Zhai, Jingying, Xie, Xiaojiang, Bakker, E   +2 more
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DEVELOPMENT OF AN INDICATOR DISPLACEMENT ASSAY REAGENT FOR SACCHARIDE QUANTITATION

2020
Boronic acid-appended molecules have been popular in classical guest-host interactions with saccharides that use an integrated indicator-receptor motif. Though the literature shows a number of novel sensors varying in degrees of synthetic difficulty and water solubility, such sensor systems were never refined into a working analytical tool. A promising
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New methods for quantification of Fenton’s reagent addition based on aged sludge indicators to improve filterability

Journal of Hazardous Materials, 2021
Fenton oxidation can effectively improve the dewaterability of aged sludge. Quantification of the addition of optimal reagents is central to the conditioning and dewatering of aged sludge. Improving the accuracy of quantification is significant to promote cost effectiveness.
Xun Tan, Yijun Chen, Qiang Xue, Xingxing He, MingLi Wei, Ping Wang, Lei Liu, Jiangshan Li, Xiande Xie   +8 more
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Formazan-Containing Solid-Phase Reagent Indicator Systems for Environmental Analysis

Russian Journal of General Chemistry, 2018
Research results on synthesis and application of solid-phase reagents containing formazan groups were considered. The influence of the composition and structure of immobilized organic ligands on the sorption and analytical properties of the test-tools obtained were discussed.
Maslakova, T. I., Lipunov, I. N., Pervova, I. G., Maslakov, P. A.   +3 more
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Preparation of reagent indicator papers with silver triangular nanoplates for chemical analysis

Moscow University Chemistry Bulletin, 2017
An impregnation method to prepare reagent indicator papers with silver triangular nanoplates (TNPs) is developed. The conditions for obtaining modified papers (type of paper, method for applying TNPs, and drying conditions) allowing for an acceptably uniform distribution of the TNPs are chosen. The spectral characteristics of the prepared materials are
V. V. Apyari, A. A. Furletov, A. V. Garshev, P. A. Volkov, M. O. Gorbunova, A. V. Shevchenko   +5 more
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An examination of chlorpromazine hydrochloride as indicator and spectrophotometric reagent for the determination of molybdenum(V)

Analytica Chimica Acta, 1977
Abstract Chlorpromazine hydrochloride (CPA) has been tested as indicator in the titration of molybdenurn(V) with cerium(IV)sulphate at room temperature in sulphuric acid medium. It gives a sharp, reversible colour change from colourless to dark-red at the equivalence point.
H. Puzanowska-Tarasiewicz, A. Grudniewska, M. Tarasiewicz   +2 more
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Metallofluorescent indicators as spray reagents for the in situ determination of organophosphorus pesticides on thin-layer chromatograms

Analytica Chimica Acta, 1972
Abstract Fluorescence-quenched solutions of palladium(II)-calcein and palladium(II)-calcein blue are shown to be sensitive spray reagents for the detection and in situ determination of organothiophosphorus insecticides on thin-layer chromatograms.
T F, Bidleman, B, Nowlan, R W, Frei
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