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  • Into Thin Air
    Measuring fumigant concentration at several distances above the soil surface, a student adjusts the rate of airflow through a charcoal sample collector. The charcoal is used to absorb and trap fumigant gases, which are then analyzed in the laboratory. It 's hard to find fault with strawberries
  • Evaluating sample preparation techniques for cleanroom wiper testing
    by quantification using sensitive analytical instrumentation. Controversies such as wet versus dry testing removing particles via immersion in liquid as opposed to agitation in air which predominated in the late 1980s, have today mostly been resolved in favor of wet testing. Published by the Institute
  • Air-Handling With Care
    1910.1001 through 1052. Table I identifies some sample permissible exposure limit values. For any new compound or intermediate, the company's environmental safety and health group typically establishes TLV and STEL values through toxicological testing, after a drug candidate has advanced through
  • Direct Analysis in Real Time (DART TM) Mass Spectrometry
    , liquids, and solids in open air at ground potential under ambient conditions. Traditional ion sources used in mass spectrometry require the introduction of samples into a high vacuum system. Traditional ion sources operated in vacuum include electron ionization (EI)[1], chemical ionization (CI)[2

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