Sensitive Assessment of Hexavalent Chromium Using Various Uniform and Non-uniform Color Space Signals Derived from Digital Images

Digital imaging using conventional camera, mobile phone camera, or computer scanner can be a convenient and low-cost approach for the highly sensitive assessment of hexavalent chromium in natural and waste waters. An aliquot sample containing Cr(VI) is reacted with diphenylcarbazide to yield a chara...

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Bibliographic Details
Published inWater, air, and soil pollution Vol. 231; no. 10
Main Authors Shalaby, Ahmed A., Mohamed, Ashraf A.
Format Journal Article
LanguageEnglish
Published Cham Springer International Publishing 01.10.2020
Springer
Springer Nature B.V
Subjects
Analyzers
Atmospheric Protection/Air Quality Control/Air Pollution
Cameras
Chromium
Climate Change/Climate Change Impacts
Color
Colour
Comparative analysis
Digital imaging
Diphenylcarbazide
Earth and Environmental Science
Environment
Environmental monitoring
Hexavalent chromium
Hydrogeology
Image analysis
Image processing
Low cost
Mobile computing
Soil Science & Conservation
Spectrophotometers
Wastewater
Water Quality/Water Pollution
Colorimetric assessment of Cr(VI)
Diphenylcarbazide reagent
Non-uniform and uniform color spaces
Digital image analysis
Color absorbance
Natural and waste waters
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Summary:Digital imaging using conventional camera, mobile phone camera, or computer scanner can be a convenient and low-cost approach for the highly sensitive assessment of hexavalent chromium in natural and waste waters. An aliquot sample containing Cr(VI) is reacted with diphenylcarbazide to yield a characteristic violet color. Image analysis of the violet-colored product gave the red, green, and blue (RGB) intensities that are converted into ten uniform and non-uniform color spaces and two color difference parameters, which are used and compared here, for the first time, as analytical signaling tools for the assessment of hexavalent chromium. Many of the acquired signals displayed outstanding analytical performance and statistically surpassed the regularly used RGB signals and competed well with signals of a sophisticated Shimadzu 1650 PC spectrophotometer. The sensitivity and simplicity and low cost of this strategy make it an outstanding competitor for commercial hexavalent chromium analyzers and advanced spectrophotometers. Graphical abstract
ISSN:0049-6979
1573-2932
DOI:10.1007/s11270-020-04891-6