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Related Concept Videos

E2 Reaction: Kinetics and Mechanism02:45

E2 Reaction: Kinetics and Mechanism

SN2 substitutions and E2 eliminations of alkyl halides proceed via a concerted pathway. While the nucleophile attacks the alpha carbon in SN2 reactions, it functions as a strong base and abstracts a beta hydrogen in the E2 mechanism. The rate-limiting transition state in E2 elimination reactions is characterized by partially broken carbon–hydrogen and carbon–halogen bonds and a partially formed pi bond between the alpha and beta carbons. The beta hydrogen and halide are eliminated...

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Related Experiment Video

Updated: Jun 21, 2026

Synthesis and Characterization of Functionalized Metal-organic Frameworks
11:27

Synthesis and Characterization of Functionalized Metal-organic Frameworks

Published on: September 5, 2014

Beryllium decontamination with different solvents on different structures.

A Dufresne1, C Dion, S Viau

  • 1Department of Environmental and Occupational Health, Faculty of Medicine, Université de Montréal, Pavillon Marguerite-d'Youville 2375, Chemin de la Côte-Ste-Catherine, Montréal, Québec H3T 1A8, Canada. andre.dufresne@umontreal.ca

The Annals of Occupational Hygiene
|July 17, 2009
PubMed
Summary
This summary is machine-generated.

Moistened wipes effectively removed beryllium from most surfaces across industrial settings. However, concrete floors remained a challenge, with some areas failing to meet clearance levels even after multiple treatments.

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Area of Science:

  • Occupational Health and Safety
  • Environmental Decontamination
  • Materials Science

Background:

  • Beryllium contamination poses significant health risks in various industrial environments.
  • Effective decontamination methods are crucial for worker safety and regulatory compliance.
  • Previous studies have explored various cleaning agents, but surface-specific efficacy requires further investigation.

Purpose of the Study:

  • To evaluate the efficiency of moistened wipes with different cleaning solutions for beryllium removal.
  • To assess decontamination effectiveness across diverse surfaces and occupational settings.
  • To determine if specific solutions or surfaces present challenges for beryllium decontamination.

Main Methods:

  • Testing moistened wipes with Citranox, Alconox, NaCl 5%, Resolve, and Ledizolv.
  • Applying decontamination procedures on unpainted metal, wood, painted metal, concrete, painted concrete, and Plexiglas.
  • Analyzing beryllium levels on surfaces in an aluminium smelter, machine tooling, and military/aerospace/telecom plants.
  • Utilizing high-pressure cleaning in specific scenarios.

Main Results:

  • All tested solvents effectively decontaminated surfaces in the aluminium smelter to below the 0.2 microg/100 cm² clearance level.
  • In machine tooling, clearance levels were achieved after three decontaminations with all solvents.
  • Beryllium removal from concrete floors proved challenging, with levels often exceeding clearance standards even after high-pressure cleaning.

Conclusions:

  • Moistened wipes are generally effective for beryllium decontamination across various surfaces, except for concrete floors.
  • The choice of cleaning solution did not significantly impact decontamination efficacy in this study.
  • Further research is needed to develop effective beryllium removal strategies for porous surfaces like concrete.