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PO 123Real Time Detection Systems II

Presenting Author: Jennifer Maclachlan,

PID Analyzers, LLC

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DATE: Wednesday June 4, 2014 | 10:00 AM - 12:00 PM

LOCATION: San Antonio, TX Convention Center 0006 C-D

TOPIC: Real-Time Detection Systems

See PID Analyzers at booth 3089

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Real-Time Detection Systems IIArranger: W. Groves, Energy and Mineral Engineering, Penn State University, University Park, PAModerator: P. Smith, U.S. Department of Labor  - OSHA, Sandy, UTMonitors: E. Ligus, Draeger Safety, Inc., Pittsburgh, PA; T. Pearce, OSHA, Edmond, OK10:00 AM – 10:30 AMField Measurement of Common Fumigants via Portable GC with PID & FUV DetectorsJ. Driscoll, J. Maclachlan, PID Analyzers, LLC, Sandwich, Massachusetts, MA10:30 AM – 11:00 AMThe Needle Trap Device as Sampler or Focusing Trap: Quantitative and Sensitivity Comparability of GC Injection Port Solvent and Thermal Desorption Analyte IntroductionT. Juarez, S. Strating, M. Stevens, D. White, Uniformed Services University of the Health Sciences, Bethesda, MD; P. Smith, U. S. Department of Labor-OSHA, Health Response Team, Salt Lake Technical Center, Sandy, UT11:00 AM – 11:30 AMElimination of Sensor Maintenance by Sensor Interrogation and CorrectionT. Scheffler, Mine Safety Appliances Co., Cranberry Township, PA11:30 AM – 12:00 PMEstimating Integrated VOC Exposure in Near Real-TimeE. Floyd, University of Oklahoma, Oklahoma City, OK; C. Lungu, University of Alabama at Birmingham, Birmingham, AL- See more at: http://aihce2014.org/course/real-time-detection-systems-ii/#sthash.JpNFdp80.dpuf

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Field Measurement of Common Fumigants via Portable GC with PID & FUV Detectors

By: Jennifer Maclachlan and Jack Driscoll

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Objective: More than two dozen different chemicals have been used as fumigants for grain including organics like methyl bromide, inorganic chemicals

like sulfuryl fluoride ,and even chemical agents such as cyanogen chloride. Deaths from fumigants have occurred in rail cars, ships, grain elevators, green

houses, pest control … A field method for detecting common fumigants is essential since many workers encounter these dangerous chemicals which do

not have OSHA field detection methods.

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Field Measurement of Common Fumigants via Portable GC with PID & FUV Detectors

By: Jennifer Maclachlan and Jack DriscollLive tweeting use: #RTDS2 #AIHce

Methods: Utilizing a portable gas chromatograph Model GC312 equipped with a battery and weighing in at 26 pounds, this field tool can detect part per billion

(ppb) levels of fumigants with a photoionization detector (PID). A 30M x 0.32 mm capillary with 5 or 10 micron methyl silicone film is used for separating gases

and volatile compounds. The far UV absorbance (FUV) detector detects the low or sub ppm levels of a variety of hydrocarbons & low molecular weight (MW)

gases such as hydrogen cyanide, sulfur dioxide, and sulfuryl fluoride that absorb at 126 nano meters (nm).

See PID Analyzers at booth 3089

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Field Measurement of Common Fumigants via Portable GC with PID & FUV Detectors

By: Jennifer Maclachlan and Jack DriscollLive tweeting use: #RTDS2 #AIHce

Results : Some of the common fumigants used today are methyl bromide, ethylene oxide, phosphine, and ethylene dibromide. All of these compounds can be detected at ppb levels by GC/PID with a thick film capillary column. The PID has a detection limit of < 5 ppb

for PH3, and can detect part per trillion (ppt) levels of dibromochloro propane (PEL = 1ppb) by PID if the internal

concentrator on the portable GC is used. The FUV can detect hydrogen cyanide, ethylene dichloride, dichloropropane, sulfur

dioxide and sulfuryl fluoride at low or sub ppm levels. The detection limit for SO2 by FUV is 0.5 ppm.

See PID Analyzers at booth 3089

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Field Measurement of Common Fumigants via Portable GC with PID & FUV Detectors

By: Jennifer Maclachlan and Jack DriscollLive tweeting use: #RTDS2 #AIHce

Conclusions: A portable GC with a thick film cap column equipped with PID and Far UV detectors can detect the most common fumigants in use today at

levels of 0.1 of the PEL. The portable GC is easily carried to the field and can be operational in about 20-30 minutes. It can detect the ten most common

fumigants described above plus many of the more than two dozen chemicals used in fumigation.

See PID Analyzers at booth 3089