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PO 115Real Time Detection Systems I

Presenting Author: Jennifer Maclachlan,

PID Analyzers, LLC

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DATE: Tuesday June 3, 2014| 2:00 PM - 3:30 PM

LOCATION: San Antonio, TX Convention Center 214A

TOPIC: Real-Time Detection Systems

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Real-Time Detection Systems IArranger: P. Smith, U.S. Department of Labor – OSHA, Sandy, UT

Moderator: W. Groves, Energy and Mineral Engineering, Penn State University, University Park, PA

Monitors: M. Roe, 3M, Blaine, MN; P. Moser, Indiana University, Bloomington, IN

2:00 PM – 2:30 PM Field-Portable Fourier Transform Infrared Spectroscopy for Simultaneous Detection and Quantitation of an Unexpected Airborne ContaminantP. Smith, J. Hill, U.S. Department of Labor – OSHA, Sandy, UT

2:30 PM – 3:00 PM A Rapid and Accurate Field Method for Reduced Sulfur Compounds by GC/FPDJ. Driscoll, J. Maclachlan, PID Analyzers, LLC, Sandwich, MA

3:00 PM – 3:30 PM Real-time Field Assessment Methods for Quantifying Carbon Dioxide Levels Present in Workplace AtmospheresJ. Hill, P. Smith, U.S. Department of Labor – OSHA, Sandy, UT

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A Rapid and Accurate Field Method for Reduced Sulfur Compounds by GC/FPD

By: Jennifer Maclachlan and Jack Driscoll

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Objective: The OSHA method for hydrogen sulfide (H2S) is complex and involves precipitation, oxidation and ion

chromatographic analysis. The dimethyl sulfide and carbon disulfide are collected, desorbed with a solvent and analyzed by a gas chromatograph (GC) configured with a flame photometric detector (FPD). These methods are complex, time consuming

and do not provide a fast response for the toxic sulfur compounds. A portable GC with an FPD should have sufficient

sensitivity at part per billion (ppb) measurements to detect these sulfur compounds rapidly in the field without any need for sample

concentration.

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A Rapid and Accurate Field Method for Reduced Sulfur Compounds by GC/FPDBy: Jennifer Maclachlan and Jack Driscoll

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Methods: The Model GC312 portable gas chromatograph with an FPD was used for these tests. The PeakWorks™ four point calibration software was used to linearize the FPD sulfur (normal output is a square root response). A 30 meter thick film capillary column provides an accurate and reproducible separation for the three sulfur compounds at ppb to ppm levels in under four minutes. Samples

were injected automatically using a 10 port valve. Low level samples were prepared using permeation tubes.

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A Rapid and Accurate Field Method for Reduced Sulfur Compounds by GC/FPD

By: Jennifer Maclachlan and Jack DriscollLive tweeting use: #RTDS1 #AIHce

Results : Utilizing the portable GC with FPD allows for the rapid detection of sulfur compounds at ppb levels in the air. The sulfur compounds of interest include hydrogen sulfide (PEL =10 ppm),

dimethyl sulfide (PEL= 10 ppm) and carbon disulfide (PEL = 20 ppm).The detection limits for

the GC/FPD were found to be < 1% of the PEL.

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A Rapid and Accurate Field Method for Reduced Sulfur Compounds by GC/FPDBy: Jennifer Maclachlan and Jack Driscoll

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Conclusions: The GC/FPD method provides a very rapid and sensitive technique for the analysis of sulfur compounds in the field in real-time. The

precision of H2S for 10 samples at one tenth of the PEL was approximately 1%. Although, we have analyzed three of the problematic sulfur compounds, the

same method could be applied to other compounds such as methyl mercaptan, carbonyl sulfide, etc.

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