Multivariate optimization of a solid-phase microextraction method for the analysis of phthalate esters in...

Area of Science:

• Environmental Chemistry
• Analytical Chemistry

Background:

• Phthalate esters are common environmental pollutants.
• Accurate determination of phthalates in water is crucial for environmental monitoring.

Purpose of the Study:

• To develop and optimize a solid-phase microextraction (SPME) method coupled with gas chromatography-mass spectrometry (GC-MS).
• To determine six US EPA Priority Pollutant phthalate esters in water samples.

Main Methods:

• Solid-phase microextraction (SPME) coupled with gas chromatography-mass spectrometry (GC-MS).
• Optimization of extraction parameters using a multifactor categorical design.
• Investigation of various commercial SPME fibers and extraction modes (direct sample exposure and headspace).

Main Results:

• The optimized SPME-GC-MS method demonstrated linear response and good precision for all target phthalate esters.
• Low picogram per milliliter detection limits were achieved for most analytes.
• Phthalate esters were detected in all real water samples analyzed, with DEP and DEHP exceeding 1 ng mL(-1) in some cases.

Conclusions:

• The developed SPME-GC-MS method is effective for the determination of priority pollutant phthalates in diverse water matrices.
• The method provides a sensitive and reliable tool for environmental water quality assessment.
• The presence of phthalates in various water types highlights the need for continued monitoring.