Procedural Challenges in Soil Sample Preparation for Pharmaceuticals Analysis.

Area of Science:

• Environmental Chemistry
• Analytical Chemistry
• Food Science

Background:

• Pharmaceuticals from industrial farms pose environmental and public health risks.
• Accurate determination of trace pharmaceutical levels in soil is challenging.
• Selecting appropriate analyte extraction procedures is critical for reliable results.

Purpose of the Study:

• To evaluate five sample preparation procedures for determining 24 pharmaceuticals in soil.
• To compare analyte recovery rates across different preparation methods.
• To identify an optimized procedure for analyzing pharmaceutical residues in environmental soil samples.

Main Methods:

• Evaluation of ultrasonication and filtration techniques to minimize analyte loss.
• Comparison of analyte recovery for 24 pharmaceuticals using five distinct preparation procedures.
• Application of the optimized procedure to soil samples from a poultry farm area.

Main Results:

• Ultrasonication and filtration can lead to significant elimination (up to 100%) of certain pharmaceuticals like amoxicillin, ampicillin, and lincomycin.
• The optimized procedure improved recovery for 15 out of 24 pharmaceuticals compared to the initial method.
• Isotopically labeled internal standards enabled accurate analysis of problematic compounds with low recovery.

Conclusions:

• Optimized sample preparation procedures are essential for accurate pharmaceutical residue analysis in complex environmental matrices.
• Despite potential losses during sample preparation, methods using internal standards can achieve acceptable accuracy.
• This research contributes to improved environmental monitoring strategies for pharmaceutical contaminants in soil.