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Related Experiment Video

Updated: Feb 16, 2026

Measuring Nitrite and Nitrate, Metabolites in the Nitric Oxide Pathway, in Biological Materials using the Chemiluminescence Method
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A soft material for chromium speciation in water samples using a chemiluminescence automatic system.

Cintia J Fernandez1, Claudia E Domini1, Marcos Grünhut1

  • 1INQUISUR, Departamento de Química, Universidad Nacional del Sur, (UNS)-CONICET, Av. Alem 1253, B8000CPB, Bahía Blanca, Argentina.

Chemosphere
|January 9, 2018
PubMed
Summary

A novel soft material effectively separates and quantifies chromium species (Cr(VI) and Cr(III)) in natural waters using a automated flow system and chemiluminescence detection. This method offers high precision and accuracy for environmental monitoring.

Keywords:
Automatic systemChemiluminescence detectionChromium speciationIonic liquidsMultiwalled carbon nanotubes

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Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry
  • Materials Science

Background:

  • Chromium speciation is crucial for assessing water quality and environmental impact.
  • Existing methods for chromium speciation can be complex and time-consuming.
  • Novel sorbent materials are needed for efficient and accurate chromium analysis.

Purpose of the Study:

  • To develop a new method for chromium speciation in natural waters.
  • To utilize a novel soft material composed of multiwall carbon nanotubes and 1-butyl-3-methyl imidazolium chloride as a sorbent.
  • To establish a fully automated flow-batch analysis system for quantifying Cr(VI) and Cr(III).

Main Methods:

  • A multicommutated flow system with a minicolumn packed with the novel soft material was designed.
  • The sorbent selectively retains Cr(VI) while allowing Cr(III) to pass.
  • Chemiluminescence detection was employed, with Cr(III) acting as a catalyst and Cr(VI) as an oxidant in luminol reactions.

Main Results:

  • The developed method demonstrated low limits of detection: 1.4 μg/L for Cr(VI) and 4.0 μg/L for Cr(III).
  • High precision was achieved, with relative standard deviations of 3.8% for Cr(VI) and 7.0% for Cr(III).
  • The method showed excellent performance in real water samples, with recoveries ranging from 95% to 107%.

Conclusions:

  • The novel soft material and automated flow system provide an effective approach for chromium speciation in natural waters.
  • This method offers a new analytical strategy, particularly the use of Cr(VI) as an oxidant in luminol chemiluminescence, which has not been previously reported.
  • The results are comparable to those obtained using the inductive coupled plasma-optical emission spectrometry technique, validating the method's reliability.