Digital imaging devices as sensors for iron determination

Area of Science:

• Analytical Chemistry
• Environmental Science
• Biotechnology

Background:

• Portable, sensitive, and cost-effective sensors are crucial, particularly in resource-limited settings.
• Digital imaging devices offer a potential solution for on-site chemical analysis.

Purpose of the Study:

• To evaluate the use of common digital imaging devices (desktop scanner, digital camera, smartphone) for quantifying iron.
• To enhance the accuracy and sensitivity of iron determination using digital image analysis.

Main Methods:

• Iron was determined using three standard colorimetric reactions.
• Images of reacting solutions were captured and analyzed using RGB (red, green, blue) color space parameters.
• RGB values were converted to uniform color space values and color difference attributes to improve calibration and sensitivity.

Main Results:

• The converted color space signals demonstrated improved linearity, sensitivity, and detection limits compared to raw RGB signals.
• Digital imaging methods showed comparable results to reference spectrophotometric measurements.
• The approach was successfully applied to diverse real-world samples, including water, soil, plant, meat, and liver.

Conclusions:

• Digital imaging devices provide a simple, sensitive, and cost-effective method for iron determination.
• This approach is a viable alternative to field-monitoring instruments and sophisticated spectrophotometers for iron analysis.
• The method is applicable across various matrices, demonstrating its practical utility.