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Related Concept Videos

Sample Preparation for Analysis: Overview01:21

Sample Preparation for Analysis: Overview

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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...
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Sample Preparation for Analysis: Advanced Techniques01:08

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Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
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Sampling Methods: Sample Types01:18

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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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Sampling Plans01:23

Sampling Plans

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Sampling is a crucial step in analytical chemistry, allowing researchers to collect representative data from a large population. Common sampling methods include random, judgmental, systematic, stratified, and cluster sampling.
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Sampling Methods: Overview01:06

Sampling Methods: Overview

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A sample refers to a smaller subset representative of a larger population. In analytical chemistry, studying or analyzing an entire population is often impractical or impossible. Therefore, samples are used to draw inferences and generalize the whole population. The sampling method selects individuals or items from a population to create a sample. Standard sampling methods include random, judgemental, systematic, stratified, and cluster sampling. 
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Updated: Apr 21, 2026

Clean Sampling and Analysis of River and Estuarine Waters for Trace Metal Studies
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New trends in sample preparation techniques for environmental analysis.

Cláudia Ribeiro1, Ana Rita Ribeiro, Alexandra S Maia

  • 1a CESPU, Instituto de Investigação e Formação Avançada em Ciências e Tecnologias da Saúde , Gandra , Portugal.

Critical Reviews in Analytical Chemistry
|November 14, 2014
PubMed
Summary
This summary is machine-generated.

New sample preparation techniques for environmental analysis offer faster, cheaper, and greener methods. These advancements in solid phase microextraction and QuEChERS reduce solvent use and improve efficiency for organic pollutant detection.

Keywords:
Dispersive liquid-liquid microextractionQuEChERSenvironmental analysesmicroextraction by packed sorbenton-line solid phase extractionsample preparationsolid phase microextraction

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Area of Science:

  • Analytical Chemistry
  • Environmental Science

Background:

  • Environmental sample analysis faces challenges due to complex matrices, low analyte concentrations, and interferences.
  • Traditional sample preparation methods are often laborious, costly, time-consuming, and environmentally detrimental.

Purpose of the Study:

  • To review recent advancements in sample preparation techniques for environmental analysis.
  • To highlight methods that are faster, cost-effective, and environmentally friendly.

Main Methods:

  • Solid Phase Microextraction (SPME)
  • On-line Solid Phase Extraction (On-line SPE)
  • Microextraction by Packed Sorbent (MEPS)
  • Dispersive Liquid-Liquid Microextraction (DLLME)
  • QuEChERS (Quick, Easy, Cheap, Effective, Rugged and Safe)

Main Results:

  • New techniques focus on miniaturization, reduced solvent consumption, or solventless operation.
  • Automation of extraction systems is a growing trend.
  • These methods aim to improve efficiency and reduce uncertainties in environmental analysis.

Conclusions:

  • Modern sample preparation techniques offer significant advantages over traditional methods.
  • Adoption of these techniques can lead to more sustainable and efficient environmental monitoring.
  • Further development and application of these methods are crucial for accurate pollutant analysis.