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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.
Bulk or large solid samples are typically reduced in size using grinding, crushing, or milling techniques to increase the...
Sampling Methods: Sample Types01:18

Sampling Methods: Sample Types

Sampling materials are classified into three main types: solid, liquid, and gas.
Solid samples include a variety of substances, such as sediments from water bodies, soil, metals, and biological tissues. Two standard methods for extracting sediments from water bodies are grab sampling and piston coring. Grab sampling involves using a device to collect a discrete sediment sample from the bottom of a water body with minimal disturbance. Grab samples do not always represent the entire area due to...

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Related Experiment Video

Updated: Jun 1, 2026

Gas Chromatography-Mass Spectrometry Paired with Total Vaporization Solid-Phase Microextraction as a Forensic Tool
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Sampling and determination of formaldehyde using solid-phase microextraction with on-fiber derivatization.

P A Martos1, J Pawliszyn

  • 1The Guelph [Formula: see text] Waterloo Centre for Graduate Work In Chemistry, Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.

Analytical Chemistry
|June 8, 2011
PubMed
Summary
This summary is machine-generated.

A new method uses o-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine hydrochloride (PFBHA) on solid-phase microextraction fibers for sensitive gaseous formaldehyde detection. This technique offers reproducible, reversible sampling and analysis, outperforming conventional methods.

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Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures

Published on: January 7, 2019

Area of Science:

  • Analytical Chemistry
  • Environmental Science

Background:

  • Gaseous formaldehyde is a common air pollutant with significant health implications.
  • Accurate and sensitive detection of formaldehyde is crucial for environmental monitoring and exposure assessment.
  • Existing sampling methods for formaldehyde can be cumbersome and less sensitive.

Purpose of the Study:

  • To develop a novel, highly sensitive, and reproducible method for sampling and analyzing gaseous formaldehyde.
  • To utilize solid-phase microextraction (SPME) with a derivatizing agent for enhanced formaldehyde detection.
  • To compare the performance of the new method against conventional formaldehyde sampling techniques.

Main Methods:

  • Gaseous formaldehyde was derivatized using o-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine hydrochloride (PFBHA) on SPME fibers.
  • The stable oxime product was analyzed using gas chromatography with flame ionization detection.
  • Loading and desorption of PFBHA and the oxime were optimized for reproducibility and reversibility.

Main Results:

  • The method demonstrated high reproducibility and reversibility over 200 sampling cycles.
  • Detection limits for formaldehyde were as low as 4.6 ppbv with a 300-second sampling time.
  • The developed method showed performance equal to or better than conventional grab sampling techniques.
  • Quantification was achieved through calibration curves or a first-order rate constant, eliminating the need for calibration curves in some cases.

Conclusions:

  • The PFBHA-derivatized SPME method provides a sensitive, reproducible, and efficient approach for gaseous formaldehyde analysis.
  • This technique is suitable for various applications, including air monitoring and analysis of complex matrices like cosmetics and building products.
  • The method offers a significant advancement over traditional formaldehyde sampling techniques.