Colour changes of chemical indicators—VI☆Metallochromic indicators for direct chelometric titrations of zinc

Molar absorption coefficients and stability constants of metal complexes of 4-(2-pyridylazo)resorcinol (PAR): Revisiting common chelating probe for the study of metalloproteins

“…It requires hydrophobic solvents and thus is not suitable for metalloprotein-based applications [13][14]. One of the most popular chelating chromophores for the bioinorganic analysis of Zn 2+ is watersoluble 4-(2-pyridylazo)resorcinol (PAR) [15]; however, a number of other compounds have been applied to measure Zn 2 + , such as Zincon, Eriochrome Blue SE, Eriochrome red B, Naphtylazoxine 6S and SNAZOXS [16,17] (Fig. 1, Fig.…”

Critical study of chromatic parameters in color break indicator evaluation

“…Therefore, a demand for monitoring these hydrides has been increasing. So far, atomic absorption spectrometry, inductively coupled plasma emission spectrometry (1), flame photometric detector coupled with gas chromatography (2), and chemiluminescence spectrometry with ozone oxidation (3) have been used for their determination. However, since each of these methods requires an expensive instrument, an explosive gas, or a poisonous gas, they do not appear to be suitable for the monitoring system.…”

“…Different parameters have been used to evaluate the quality of indicators: Reilley proposed the grayness, length, and position of color transition curves (1). Photometric titration curves were used by Vytras (2). Judson (3) deals with chromaticity difference values, AC, between adjacent points (also called chromatic separation, ) and luminosity parameters.…”

Exploring the nature of the clopidogrel–bromocresol green interactionviaspectrophotometric measurements and quantum chemical calculations

“…Sulfonephthalein dyes are commonly used as indicators in acid-base titrations. They have been also used to build pHsensors 8 and for the spectrophotometric determination of different drugs. 9,10 Correlation between the pK a of these dyes with the nature of the substituent group was studied using the stability quotients from absorbance data.…”

“…Analytical parameters for the determination of CLOP$H 2 SO 4 using BCG a Molar absorptivity (L mol À1 cm À1 ) 5.67 Â 10 3 Sandell sensitivity (mg cm À2 ) 8.06 Â 10 À2 K f is the formation constants calculated from the continuous variation data.29112 | RSC Adv.,2018,8,[29104][29105][29106][29107][29108][29109][29110][29111][29112][29113][29114] This journal is © The Royal Society of Chemistry 2018…”