Column silylation method for determining endocrine disruptors from environmental water samples by solid phase...

Area of Science:

• Analytical Chemistry
• Environmental Science

Background:

• Solid Phase Micro-extraction (SPME) is a solvent-free technique for analyte extraction.
• Traditional SPME methods face challenges in efficiently extracting polar compounds like phenols.

Purpose of the Study:

• To develop and optimize a headspace SPME (HS-SPME) method for the sensitive determination of various phenols in water samples.
• To investigate the impact of acidification and salting-out on phenol extraction efficiency.

Main Methods:

• Utilized poly(acrylate) coating fibers for SPME of phenols.
• Employed headspace sampling with optimized extraction (60 min) and desorption (5 min at 300°C) conditions.
• Analyte derivatization using bis(trimethylsilyl)trifluoroacetamide (BSTFA) followed by GC-MS analysis.

Main Results:

• Achieved high precision with relative standard deviations (RSDs) ranging from 3-12%.
• Demonstrated significant improvement in phenol detection by incorporating acidification (pH 2.0) and salting-out (saturated NaCl).
• Obtained limits of detection in the sub-parts per billion range for total phenols in environmental water samples.

Conclusions:

• Optimized HS-SPME with acidification and salting-out is a highly effective technique for quantifying phenols in environmental water.
• The method offers simplicity, low cost, and on-site sampling capabilities without requiring organic solvents.
• The derivatization step significantly enhances the detectability of free phenols.