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Related Concept Videos

Sample Preparation for Analysis: Overview01:21

Sample Preparation for Analysis: Overview

Sample preparation is an essential step in the analytical process. It involves preparing a sample so that it can be analyzed accurately. The goal is to extract the analyte, the substance you want to measure, from the sample while removing any components that may interfere with the analysis. Sample preparation techniques vary depending on the physical state of the sample.
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Related Experiment Video

Updated: May 20, 2026

Protocol for Microplastics Sampling on the Sea Surface and Sample Analysis
10:16

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Published on: December 16, 2016

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Matrix preparation and workflow for microplastics analysis in soil.

Zhala Gachayzade1, Parisa Akbari Dana1, Ece Tuğba Mızık1

  • 1Eskişehir Technical University, Department of Environmental Engineering, 26555, Eskişehir, Türkiye.

Chemosphere
|March 8, 2025
PubMed
Summary

This study presents a new soil method for microplastic (MP) analysis, improving purification and quantification. The developed workflow achieves ~80% recovery for virgin MPs, aiding accurate environmental monitoring.

Keywords:
CountingNile red stainingRaman spectroscopySurrogateTerrestrial environment

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Polymer Science

Background:

  • Standardized methods for microplastic (MP) enumeration in soil are lacking.
  • Accurate quantification is hindered by purification challenges and particle agglomeration.

Purpose of the Study:

  • To develop and validate a matrix preparation and experimental workflow for soil MP analysis.
  • To assess the recovery rates of microplastics using surrogate polymers and Nile Red staining.
  • To present an instrumental approach for efficient MP quantification.

Main Methods:

  • Peroxide digestion and sodium iodide (NaI) density separation for soil matrices.
  • Centrifugation for low-density polyethylene (LDPE) and polyvinyl chloride (PVC) surrogates.
  • Fluorescence microscopy and Raman spectroscopy for MP identification and quantification.

Main Results:

  • Mean recovery of ~80% for virgin MPs; >100% for stained MPs due to false positives.
  • Nile Red staining revealed morphological and fluorescence changes in PE and PVC particles after pretreatment.
  • Fast Raman spectroscopy enabled counting up to 83% of MPs, showing promise for particles down to single microns.

Conclusions:

  • The developed workflow enhances MP purification and quantification in soil matrices.
  • Challenges remain with small polymeric particles (<300 μm) due to agglomeration, affecting spectroscopic quantification.
  • Further research should focus on addressing small MP particles for improved accuracy in environmental monitoring.