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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...
Voltammetry: Stripping Methods01:13

Voltammetry: Stripping Methods

Anodic Stripping Voltammetry (ASV), Cathodic Stripping Voltammetry (CSV), and Adsorptive Stripping Voltammetry (AdSV) are electrochemical techniques used to determine trace amounts of analytes in solution. These methods involve applying a potential to an electrode and measuring the resulting current.
Anodic Stripping Voltammetry (ASV)
ASV is used to determine metals and metalloids at trace levels. It involves two steps: deposition and stripping. First, a negative potential is applied to the...
Sample Preparation for Analysis: Advanced Techniques01:08

Sample Preparation for Analysis: Advanced Techniques

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.
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
 Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing nebulizer...
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...

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Related Experiment Video

Updated: Jun 28, 2026

Clean Sampling and Analysis of River and Estuarine Waters for Trace Metal Studies
10:44

Clean Sampling and Analysis of River and Estuarine Waters for Trace Metal Studies

Published on: July 1, 2016

Preparation steps in environmental trace element analysis - facts and traps.

M Hoenig1

  • 1Centre for Veterinary and Agrochemical Research (CERVA), Leuvensesteenweg 17, B-3080 Tervuren, Belgium.

Talanta
|October 31, 2008
PubMed
Summary

Accurate environmental sample preparation is crucial for reliable trace metal analysis. This review highlights common errors in sample preparation, especially for silicate-rich matrices, to improve analytical data quality.

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Area of Science:

  • Environmental chemistry
  • Analytical chemistry
  • Spectroscopy

Background:

  • CERVA laboratory has decades of experience in Belgian environmental research.
  • National monitoring programs focus on trace metal pollution in various environmental compartments.
  • Methodology development for atomic absorption and emission spectroscopy is essential for analysis.

Purpose of the Study:

  • To review current knowledge on sample preparation possibilities and associated errors.
  • To discuss the impact of preparation procedures on measurement quality.
  • To address challenges in preparing solid samples, particularly those containing silicates.

Main Methods:

  • Review of existing literature and methodologies for sample preparation.
  • Systematic discussion of potential errors in sample preparation steps.
  • Analysis of the effects of preparation on analytical measurement quality.

Main Results:

  • Sample preparation is identified as the most critical analytical step, prone to significant errors.
  • Analyte losses due to inappropriate methodology are a major concern, especially for solid samples.
  • Dissolving silicate-containing matrices (soils, sediments, plants) presents unique challenges compared to samples like animal tissues.

Conclusions:

  • Precise sample preparation is vital for minimizing errors in trace metal analysis.
  • Methodological improvements are needed for effective dissolution of challenging matrices.
  • Understanding and controlling preparation steps are key to ensuring the quality of environmental monitoring data.