An improved step-by-step airflow/paper-based colorimetric method for highly selective determination of halides in...

Area of Science:

• Analytical Chemistry
• Environmental Science

Background:

• Halide determination is crucial for environmental and food safety analysis.
• Existing methods may lack selectivity or sensitivity for complex matrices.

Purpose of the Study:

• To develop an improved, step-by-step colorimetric method for halide determination.
• To enhance selectivity and sensitivity in analyzing complex samples.

Main Methods:

• Selective oxidation of iodide, bromide, and chloride.
• Airflow extraction of liberated halogens.
• Colorimetric detection using modified paper test-strips (silver nanoplates showed best results).

Main Results:

• Achieved low limits of detection: 0.01 mg L⁻¹ for iodide, 0.02 mg L⁻¹ for bromide, and 0.04 mg L⁻¹ for chloride.
• Demonstrated high accuracy (95-105% recovery) and precision (RSD ≤ 6%) in complex matrices like seafood and water.

Conclusions:

• The developed method offers a selective, sensitive, and accurate approach for halide analysis.
• Applicable to diverse complex samples, providing reliable results for quality control and monitoring.