Colour specification of pyridine-2-aldehyde and 6-methylpyridine-2-aldehyde p-nitrophenylhydrazones as indicators for pH determination

Fernandez, Alarico; Chozas, M. Guzmán

doi:10.1016/0039-9140(87)80088-7

Cited by 7 publications

(6 citation statements)

References 16 publications

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“…In 1976 the "Commission Internationale de l Eclairage" (CIE) recommended the use of the chromaticy coordinates L*, a* and b* for the specification of colours according to the following expressions [41][42][43][44][45]:…”

Section: Determination Of Chromatic Parametersmentioning

confidence: 99%

“…Successful results, validated by FAAS, can be obtained by finding a compromise between PAR and NG␤ concentrations used to carry out titrations. The evolution of colour changes of the new screened metallochromic indicator under the above experimental conditions has been studied by applying the specific colour discrimination (SCD) and L*, a*, b* parameters reported in literature [37][38][39][40][41][42][43][44][45]. Moreover, an actual effluent deriving from a leather industry was successfully analyzed after a mineralization pretreatment by FAAS method and the reported EDTA back-titration.…”

Section: Introductionmentioning

confidence: 99%

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EDTA excess Zn(II) back-titration in the presence of 4-(2-pyridylazo)-resorcinol indicator and naphthol green β as inert dye for determining Cr(III) as Cr(III)/EDTA complex: Application of the method to a leather industry wastewater

Venezia

Alonzo

Palmisano

2008

Journal of Hazardous Materials

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Section: Determination Of Chromatic Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

EDTA excess Zn(II) back-titration in the presence of 4-(2-pyridylazo)-resorcinol indicator and naphthol green β as inert dye for determining Cr(III) as Cr(III)/EDTA complex: Application of the method to a leather industry wastewater

Venezia

Alonzo

Palmisano

2008

Journal of Hazardous Materials

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“…In decomposition chemistry, Riley et al (4,5) for the first time used a small amount of dye solution instead of a detector in titration method. Based on this, different method based on color intensity changes were used for acid and base reactions (6)(7)(8)(9)(10) and metal detectors (7,7,9,(11)(12)(13)(14)(15)(16) .…”

Section: Introductionmentioning

confidence: 99%

Determining the Endpoint of Sediment Titrations by Smartphones

Muhaned Mohammed Eteya

2021

MLU

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In this research work, we have used the image processing technique for determining the end of sodium sulphate with standard barium chloride in precipitation titration. The white precipitate of barium sulphate produced by the reaction of barium chloride and sodium sulphate was dispersed in deionized water by magnetic stirrer and its images were taken by mobile phone camera. The resulting pictures were analyzed by Photoshop Software which shows that the intensity of magenta colour has maximum sensitivity by changing the mass of barium sulphate. Therefore; magenta colour was selected as the optimum colour. Also, to depict the calibration curve of sulphate anion, different concentrations of sulphate were prepared in buffered solutions and by addition of barium chloride to them, the intensity of magenta colour was calculated. The results show that the calibration curve was linear in the range of 5-75 mg.L -1 of sulpahte with a correlation coefficient of 0.973. Finally, by titration of different real samples such as Tap, river and mineral waters containing sulphate anion with standard barium chloride, the variation of magenta colour was recorded and the concentration of sulpahte anion was determined.

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“…In the fields of chemistry and enology the determination of the color spaces of liquid samples is widely applied. For example, chemists evaluate color using the CIE L * a * b * model of organic dyes and colorants − and pH indicators, − and enologists analyze the color of wine and spirit samples. − This procedure is officially described by the International Organization of Vine and Wine (OIV) as “one of the most important visual features that provide a large amount of information”…”

Section: Introductionmentioning

confidence: 99%

Color Space Mathematical Modeling Using Microsoft Excel

et al. 2018

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Colorimetry allows every color to be defined as a combination of three values, known as color coordinates. Color coordinates allow researchers to universalize and standardize their color measurements, and nowadays, determining the color coordinates of samples is a routine method applied by organic and analytical chemists, students, and specialists like enologists. Although the colorimetry method requires a simple experimental procedure, many students, researchers and teachers might find the mathematical treatment of the data too difficult. In this paper, we introduce two workbooks using Microsoft Excel with Microsoft Visual Basic that simplify the use of colorimetry: one of these workbooks is specifically oriented to students and teachers, and it includes explanations and information about each color model. The second workbook is aimed at researchers, and it allows them to introduce and analyze numerous samples at the same time. Finally, another workbook has been included that contains various sample spectra that teachers can use to improve student comprehension of color coordinates.

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Colour specification of pyridine-2-aldehyde and 6-methylpyridine-2-aldehyde p-nitrophenylhydrazones as indicators for pH determination

Cited by 7 publications

References 16 publications

EDTA excess Zn(II) back-titration in the presence of 4-(2-pyridylazo)-resorcinol indicator and naphthol green β as inert dye for determining Cr(III) as Cr(III)/EDTA complex: Application of the method to a leather industry wastewater

EDTA excess Zn(II) back-titration in the presence of 4-(2-pyridylazo)-resorcinol indicator and naphthol green β as inert dye for determining Cr(III) as Cr(III)/EDTA complex: Application of the method to a leather industry wastewater

Determining the Endpoint of Sediment Titrations by Smartphones

Color Space Mathematical Modeling Using Microsoft Excel

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