A visual strip sensor for determination of iron.

Area of Science:

• Analytical Chemistry
• Materials Science
• Environmental Science

Background:

• Iron (Fe) is an essential element but elevated levels can indicate contamination.
• Accurate and accessible methods for iron detection in various aqueous samples are crucial.

Purpose of the Study:

• To develop a visual strip sensor for the rapid and sensitive detection of iron (Fe(II)).
• To evaluate the sensor's performance in diverse aqueous matrices like natural water and fruit juices.

Main Methods:

• Synthesis of a visual sensor strip via UV-radiation induced graft polymerization of acrylamide on a poly(propylene) base.
• Immobilization of 1,10-phenanthroline as an iron-selective reagent within the polymer matrix.
• Colorimetric analysis of Fe(II) interaction with the sensor strip, observing color change intensity.

Main Results:

• The sensor strip exhibited an orange-red color change upon interaction with Fe(II).
• Color intensity was directly proportional to Fe(II) concentration, enabling quantitative analysis.
• Detection limits were 50 ng/mL (visual) and 20 ng/mL (spectrophotometric), with an overall detection limit of 1.0 ng/mL.
• Successful application in analyzing iron content in groundwater and fruit juices.

Conclusions:

• The developed visual strip sensor provides a sensitive and effective method for iron detection in aqueous samples.
• This sensor offers a promising tool for on-site monitoring of iron levels in environmental and food applications.
• The method combines simplicity with high sensitivity, making it suitable for various analytical needs.