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Related Concept Videos

Sample Preparation for Analysis: Advanced Techniques01:08

Sample Preparation for Analysis: Advanced Techniques

289
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...
289
Inductively Coupled Plasma-Mass Spectrometry (ICP-MS): Interferences01:20

Inductively Coupled Plasma-Mass Spectrometry (ICP-MS): Interferences

365
Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and...
365
Sample Preparation for Analysis: Overview01:21

Sample Preparation for Analysis: Overview

176
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...
176
Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

295
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...
295
Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

687
Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
687
Data Validation01:15

Data Validation

139
Method validation is a crucial process in analytical chemistry designed to confirm that a given method consistently produces reliable and high-quality results. This process is essential when a method is applied to different sample matrices or when procedural modifications are made, ensuring that the results meet acceptable standards across various applications.
Key parameters for method validation include:
139

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Forensic Analytical Chemistry for Minimizing Injustice: Advances and Challenges.

Raychelle Burks1, Georgina Sauzier2, Brooke W Kammrath3

  • 1Department of Chemistry, American University, Washington, DC, USA;

Annual Review of Analytical Chemistry (Palo Alto, Calif.)
|February 27, 2025
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Summary

Forensic analytical chemistry advances face challenges in the justice system. Ensuring accuracy, transparency, and reliability in forensic methods is crucial for justice and equity.

Keywords:
ethicsforensic scienceinstrumentationjusticemethodsstandardization

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Area of Science:

  • Forensic Science
  • Analytical Chemistry
  • Criminal Justice

Background:

  • Forensic analytical chemistry has advanced significantly with new technologies.
  • Forensic scientists operate within a criminal justice system influenced by law enforcement.
  • Challenges include presumptive test accuracy, portable instrumentation, and sample contamination.

Purpose of the Study:

  • To review current issues in forensic analytical chemistry.
  • To examine operational and research challenges within the criminal justice system.
  • To explore data management, machine learning integration, and laboratory reliability.

Main Methods:

  • Review of current literature and practices in forensic analytical chemistry.
  • Analysis of challenges in field drug testing and presumptive tests.
  • Discussion of data management, machine learning, and high-reliability organizations.

Main Results:

  • Presumptive tests may have accuracy issues, and portable instruments present unique challenges.
  • Sample contamination is a concern, particularly in field testing.
  • Integrating machine learning and ensuring transparency are vital for data management.

Conclusions:

  • Forensic laboratories must function as high-reliability organizations.
  • Addressing disparities and ensuring credibility are essential for reliability and equity in the justice system.
  • Transparency and robust data management are critical for stakeholders.