Chromium speciation in water using magnetic polyaniline nanoparticles coupled with microsampling injection-flame...

Area of Science:

• Analytical Chemistry
• Environmental Science

Background:

• Accurate chromium speciation is crucial for environmental monitoring and risk assessment.
• Existing methods for chromium speciation can be complex and time-consuming.

Purpose of the Study:

• To develop and optimize a novel method for chromium speciation.
• To enhance the efficiency and accuracy of chromium analysis in environmental water samples.

Main Methods:

• Solid-phase extraction using magnetic polyaniline nanoparticles (Fe3O4@PANI NPs).
• Microsampling injection-flame atomic absorption spectrometry (MIS-FAAS).
• Optimization of pH, eluent composition, and sample volume for Fe3O4@PANI NPs extraction.

Main Results:

• Successful chromium speciation achieved at pH 8.0 using Fe3O4@PANI NPs.
• High recovery (>95%) for Cr(III) and low recovery (<5%) for Cr(VI).
• Optimized method demonstrated a linear range of 2.5-94.0 μg L⁻¹, detection limit of 0.335 μg L⁻¹, preconcentration factor of 80, and precision of 3.07% for Cr(III).

Conclusions:

• The developed Fe3O4@PANI NPs-based MIS-FAAS method is effective for chromium speciation in environmental water.
• The method offers high sensitivity, good precision, and accuracy, validated with certified reference materials.
• This approach provides a reliable tool for environmental chromium monitoring.