Critical study of metallochromic indicators for calcium

Cacho, Juan; Garnica, A.; Nerín, Cristina

doi:10.1016/s0003-2670(00)84233-6

Cited by 11 publications

(3 citation statements)

References 28 publications

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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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Section: Introductionmentioning

confidence: 99%

Determining the Endpoint of Sediment Titrations by Smartphones

Muhaned Mohammed Eteya

2021

MLU

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“…4 In analytical chemistry, Reilley et al 5,6 for the first time in 1961 utilized quantitative color information instead of spectral data and evaluated the color changes of indicators. Since then, the color-change quality of various acid-base indicators [7][8][9][10][11] and metal indicators [12][13][14][15][16][17][18][19][20] has been analyzed. In these studies, the capability of indicators was evaluated by numerically representing the range and rapidity of color changes at the end point of titration.…”

Section: Introductionmentioning

confidence: 99%

End point detection of precipitation titration by scanometry method without using indicator

Abbaspour

Khajehzadeh

2012

Anal. Methods

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“…In analytical chemistry, Reilley et al , utilized quantitative color information instead of spectrum data for the first time in 1961 and evaluated the color changes of indicators. Since then, the color-change quality of various acid−base indicators − and metal indicators − has been analyzed. In these studies, the capability of indicators was evaluated by numerically representing the range and rapidity of color change at the end point of titration.…”

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confidence: 99%

Visual and Colorimetric Lithium Ion Sensing Based on Digital Color Analysis

et al. 1999

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A new optical analytical method, "Digital Color Analysis (DCA)", is proposed based on a digital color analyzer instead of the conventional optical methodology, "Spectrophotometry". The digital color analyzer is a hand-held-size instrument for measuring "colors", and it can transform the color information into numerical values, color library data, etc., that can be treated as analytical information. DCA gives us a more informative analytical method than spectrophotometry by treating colors as digital information. In addition, DCA can also simulate the optimum color variations for optimization of the visual sensor with computer assistance. By utilizing colors as digital information, colorimetric analysis that has been used for only semiquantitative analysis can serve as an accurate determination method. On the basis of DCA, we developed a plasticized PVC film optode and a paper optode for Li+ determination in saliva. After the optimization of color variation and the detection range for the Li+ measurements, the optode membrane gives colorless gray in the Li+ therapeutic range (at 10(-3) M) in saliva. Consequently, whether or not the optimum therapeutic Li+ concentration is maintained can be easily evaluated with these optodes. Especially, the sensing paper optode can be easily handled within a short measurement time (approximately 80 s) which is suitable for home use. Using the digital color analyzer with QxQy coordinates, a linear relation calibration curve can be obtained over the range from 10(-5) to 10(-1) M Li+, in which the analyzer can detect a concentration difference of approximately 0.1 mM Li+. For the near future, an accurate and simple analysis is needed for a health check at home that does not require going to a hospital. The optode based on DCA has great potential for this analytical purpose.

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Critical study of metallochromic indicators for calcium

Cited by 11 publications

References 28 publications

Determining the Endpoint of Sediment Titrations by Smartphones

Determining the Endpoint of Sediment Titrations by Smartphones

End point detection of precipitation titration by scanometry method without using indicator

Visual and Colorimetric Lithium Ion Sensing Based on Digital Color Analysis

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