Visible colour changes estimation in colorimetric determination of chromium (VI) using polymeric sensors

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The paper describes an application of a kind of optical analytical method, digital colour analysis (DCA), using colorimetric polymethacrylate sensors (optodes) in order to determine Cr (VI). The optodes are made of optically transparent polymethacrylate matrix (PMM) with 1.5-diphenylcarbazide immobilized. The developed optode can be used in determination of the analytes using solid phase spectrophotometry and calculating colour coordinates as functions of absorbance spectra. Also colour coordinates can be represented as basic colour (e.g. RGB) data after the optode image digitizing. Then one can determine the content of an analyte in a sample by an appropriate colour difference calculated for these coordinates. Experimental results of Cr (VI) determination in tap water show that the DCA relative standard deviation is 8-17 % and recovery is < 12 % at the range of determined concentrations 0.05-1.0 mg·L-1. The characteristics are comparable with those of the solid phase spectrophotometry.

Original languageEnglish
Pages (from-to)95-100
Number of pages6
JournalActa IMEKO
Issue number3
Publication statusPublished - 1 Nov 2016



  • Chromium (VI)
  • Colorimetric sensor
  • Digital colour analysis
  • Immobilized reagents
  • Optode
  • Transparent polymeric matrix

ASJC Scopus subject areas

  • Instrumentation
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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