Optrode for sensing hydrocarbons

Patent · Fri Jan 01 00:00:00 EST 1988

OSTI ID:866719

Miller, Holly ^[1]; Milanovich, Fred P ^[2]; Hirschfeld, Tomas B ^[3]; Miller, Fred S ^[1]

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1. Bethel Island, CA
2. Lafayette, CA
3. Livermore, CA

A two-phase system employing the Fujiwara reaction is provided for the fluorometric detection of halogenated hydrocarbons. A fiber optic is utilized to illuminate a column of pyridine trapped in a capillary tube coaxially attached at one end to the illuminating end of the fiber optic. A strongly alkaline condition necessary for the reaction is maintained by providing a reservoir of alkali in contact with the column of pyridine, the surface of contact being adjacent to the illuminating end of the fiber optic. A semipermeable membrane caps the other end of the capillary tube, the membrane being preferentially permeable to the halogenated hydrocarbon and but preferentially impermeable to water and pyridine. As the halogenated hydrocarbon diffuses through the membrane and into the column of pyridine, fluorescent reaction products are formed. Light propagated by the fiber optic from a light source, excites the fluorescent products. Light from the fluorescence emission is also collected by the same fiber optic and transmitted to a detector. The intensity of the fluorescence gives a measure of the concentration of the halogenated hydrocarbons.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• DOE Contract Number: W-7405-ENG-48
• Assignee: Regents of University of California (Berkeley, CA)
• Patent Number(s): US 4771006
• OSTI ID: 866719
• Country of Publication: United States
• Language: English

Related Subjects

optrode
sensing
hydrocarbons
two-phase
employing
fujiwara
reaction
provided
fluorometric
detection
halogenated
fiber
optic
utilized
illuminate
column
pyridine
trapped
capillary
tube
coaxially
attached
illuminating
strongly
alkaline
condition
maintained
providing
reservoir
alkali
contact
surface
adjacent
semipermeable
membrane
caps
preferentially
permeable
hydrocarbon
impermeable
water
diffuses
fluorescent
products
formed
light
propagated
source
excites
fluorescence
emission
collected
transmitted
detector
intensity
measure
concentration
semipermeable membrane
halogenated hydrocarbons
permeable membrane
capillary tube
light source
fiber optic
reaction product
reaction products
fluorescence emission
halogenated hydrocarbon
tube coaxially
alkaline condition
coaxially attached
fluorescent products
sensing hydrocarbons
pyridine trapped
fujiwara reaction
fluorescent product
fluorometric detection
/436/