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Unit 5.5 MISSION SPECIFIC: Air Monitoring and Sampling

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Unit 5.5 MISSION SPECIFIC: Air Monitoring and Sampling. Objectives. Identify IDLH conditions present at a hazardous materials emergency Use air monitoring data to select proper personal protective equipment

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unit 5 5 mission specific air monitoring and sampling
Unit 5.5

MISSION SPECIFIC:

Air Monitoring and Sampling

objectives
Objectives
  • Identify IDLH conditions present at a hazardous materials emergency
  • Use air monitoring data to select proper personal protective equipment
  • Properly select, start, operate and interpret air monitoring instruments provided by the AHJ
instrument characteristics
Instrument Characteristics
  • Calibration
  • Start up procedures
  • Sensitivity
  • Accuracy
  • Selectivity
  • Response time
  • Lag time
  • Inherent safety
air monitoring requirements
Air Monitoring Requirements
  • Corrosivity (pH)
    • Necessary to protect instruments
  • Radiological
  • Flammability
  • Oxygen
  • Toxicity
devices
Devices
  • pH
    • Litmus paper
    • Wetted
    • Red/Blue
  • Meters
    • Not feasible in emergency response
radiation detection
Radiation Detection
  • Types
    • Alpha
    • Beta
    • Gamma
  • Units of measure
      • 1 REM = 1,000 Mrem
      • 1 mREM = 1000 REM
radiation detection7
Radiation Detection
  • Detector Types
    • Ion chambers
    • Geiger Muller
    • Scintillation
    • Semiconductor
  • Gamma spectroscopy
    • Identification of isotopes
slide8
CGI
  • Wheatstone bridge or catalytic bead
  • Very accurate to calibrating gas
  • Readings expressed in % of LEL
  • Affected by  Temp, humidity, elevation
  • Does not identify the gas
  • Response factors needed
oxygen
Oxygen
  • Technology  Electrochemical
  • Very accurate
  • Reading  % of oxygen in air
  • Shelf life of about 1 to 2 years
  • Affected by temp
  • Poisoned by acids (CO2)
toxicity
Toxicity
  • Technology  PID or Electrochemical
  • Electrochemical
      • Chemical specific
      • Reading  PPM or % by vol.
      • Most accurate to concentration of calibration gas
      • Poisoned by acids or bases
      • Affected by  Interferences, temp
toxicity11
Toxicity
  • Photo ionization detector
      • Technology  UV bulb to ionize material
      • Not chemical specific
      • Readings  PPM
      • Accurate to calibration gas
      • Affected by  Humidity, high concentrations
      • Does not identify the gas
      • Response factors needed
wmd detection
WMD Detection
  • M8 paper
    • Colorimetric paper
    • Detects nerve agents, blister agents
    • Reading  Color change indicates agent present
    • Easy to use
    • Liquids only
  • M256A1 kit
    • Technology  Wet chemistry
    • Detects  Nerve agents, blister agents, cyanides
    • Reading  Color change indicates agent present
    • Takes about 30 min to detect vapors
    • Difficult to use in gear
    • Interpretation required by user
wmd detection13
WMD Detection
  • APD2000
    • Technology  IMS
    • Detects  Nerve agents, blister agents, pepper and tear gas, gamma radiation
    • Reading  Indicates which agent present
    • Very sensitive PPB
    • False positives
wmd detection14
WMD Detection
  • Haz Mat CAD
    • Technology  Surface Acoustical Wave (SAW) and electrochemical
    • Detects  Nerve agents, blister agents, cyanides and TICs
    • Readings  Indicates which agent type present
    • Very sensitive PPB
    • False positives
biological detection
Biological Detection
  • Protein screen
    • Indicates presence of protein
    • Some screens also indicate extremes in pH
  • Immunoassay
      • Some are very accurate
      • Possible false positives or negatives
      • Results in minutes
      • only a screening tool!!!!
    • PCR
summary
Summary
  • Air monitoring enables decision making
  • Required detection activities
    • Flammability, oxygen, radiological, toxicity
  • Instrument chacateristics
  • Instrument calibration
    • Calibration, field calibration checks, bumping
  • Relative response
activity 5 5 start up and use of organization s detection equipment
Activity 5.5

Start-up and Use of Organization’s Detection Equipment

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