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Concentrations of Samples Complying to US EPA 8270

BUCHI Corporation

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•  US EPA SW 846-8270

•  Overview of parallel evaporation

•  Importance of solvent recovery

•  US EPA SW 846-8270, analytical results

•  Summary

•  Questions

Content

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Scope of application •  Determination of the concentration levels of semivolatile

organic compounds (SVOC) in extract prepared from solid waste, soils, air media, and water samples by gas chromatography/mass spectrometry (GC/MS)

•  For example

US EPA SW 846-8270

Naphthalene Pyrene 1,2, 4 Trichlorobenzene

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Workflow

US EPA SW 846-8270

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Solvent removal of multiple solvents at once

Overview of parallel evaporation

•  Evaporate à energy in à heat •  Condense à energy out à coolant •  Energy must be equal

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Utilization of a vacuum source

Overview of parallel evaporation

Why evaporate under vacuum? •  Boiling point depends strongly on

pressure (Clausius-Clapeyron equation)

•  Lower pressure à lower boiling point Advantages: •  Protect thermo-sensitive samples •  Speed up evaporation •  Eliminate N2 usage

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Overview of parallel evaporation Syncore® Vortex evaporator overview

Primary solvent recovery source

Rack and vacuum cover

Secondary solvent recovery source

Platform

Vacuum source

Recovered solvent

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US EPA Method 3500C and other concentration methods •  Summary of Methods; section 2.2 à “Solvent recovery

apparatus is recommended for use in evaporative concentrators. EPA recommends that incorporation type of reclamation system as a method to implement an emissions reduction program.”

Source: http://www.epa.gov/osw/hazard/testmethods/sw846/pdfs/3500c.pdf

Importance of solvent recovery “Emissions Reduction Program”

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No air pollution by organic or chlorinated solvents •  Chlorinated solvents are

(potential) carcinogens •  Safe laboratory •  Clean atmosphere

Importance of solvent recovery Environmental aspects

Sustainable Safe

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Importance of solvent recovery Two solvent recovery sources

Primary solvent recovery source

Secondary solvent recovery source

> 95 % solvent recovery

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Analytical results: Phoenix Environmental Laboratories, Inc.

US EPA SW 846-8270 results

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Flushback module

US EPA SW 846-8270 results

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How it works

US EPA SW 846-8270 results

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Improved recoveries US EPA SW 846-8270 results

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Chilled appendage technology •  Less supervision •  High reproducibility •  Low risk of losing sample •  Optical sensor not required

US EPA SW 846-8270 results Reproducibility

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US EPA SW 846-8270 results Reproducibility

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•  Elimination of N2 cost •  > 95 % solvent recovery •  High analyte recovery •  Essential reproducibility •  Advanced automation

Summary

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Thank you

Download environmental Application Notes: http://www.mybuchi.com/Environmental-applications.11348.0.html  

Questions and answers  

Additional “Thank You” to: Greg Lawrence Lab Manager Phoenix Environmental Laboratories