Spectroelectrochemical sensing of chlorinated hydrocarbons for field screening and in situ monitoring applications.

Details

• Personal Author:
  Carrabba MM ; Edmonds RB ; Haas JW III ; Rauh RD
• Description:
  The use of surface enhanced Raman spectrometry (SERS) for the detection and identification of chlorinated hydrocarbons or organochlorides such as carbon-tetrachloride (56235), 1,2- dichloroethane (107062), chloroform (67663), and trichloroethylene (79016) was described. The procedure was based on a photon induced electrochemical reaction which was detected by SERS on electrodes. Electrochemical methods were used to reduce the chlorinated organic solvents into reactive intermediates, which then reacted with a trapping reagent. SERS was then used to determine the chlorinated hydrocarbons. An optical fiber was used for excitation. The findings confirmed earlier studies which indicated that carbon- tetrachloride was not observable on silver substrates. Chlorinated hydrocarbons were not observable on silver or gold substrates, but SERS spectra were visible when they were examined with a copper electrode. Preliminary observation suggested that the SERS spectrum is only observable for a finite amount of time. The result is either due to the degradation of the electrode or the sample. The SERS on copper surfaces was a method which not only sensed the chlorinated hydrocarbons in a solution, but was also able to remove them from the solution.
• Subjects:
  Accidents, Occupational Asbestos Autopsy Chemistry Inorganic Chemicals Lung Lung Diseases Microbiology Occupational Health Respiratory System Respiratory Tract Diseases Safety

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• Keywords:
  Chemical-analysis Chlorinated-hydrocarbons Electrochemical-analysis Environmental-pollution Monitoring-systems Organo-chlorine-compounds Spectrographic-analysis
• Document Type:
  Text
• Genre:
  Conference/Symposia Proceedings
• Place as Subject:
  Florida ; OSHA Region 4
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  67-72
• NIOSHTIC Number:
  nn:00210412
• Citation:
  NIOSH 1991 Feb; :67-72
• CAS Registry Number:
  Carbon tetrachloride (CAS RN 56-23-5) ; 1,2-Dichloroethane (CAS RN 107-06-2) ; Chloroform (CAS RN 67-66-3) ; Trichloroethylene (CAS RN 79-01-6)
• Federal Fiscal Year:
  1991
• Peer Reviewed:
  False
• Source Full Name:
  Field Screening Methods for Hazardous Wastes and Toxic Chemicals. Second International Symposium, February 12-14, 1991. Sponsored by U.S. EPA; U.S. DOE; U.S. Army Toxic and Hazardous Materials Agency; U.S. Army Chemical Research Development and Engineering Center; U.S.A.F.; Florida State Univ.; National Environmental Technology Applications Corp.; and NIOSH
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:52296eb207beea9bb66d5ba6eb7ac24cc54dabade4850292da45cffae1fb719e95f583393b38a5bfb3ae09aeb4a5fe1faf11c6b837db5f6c6eb7ded0676e6f94
• Download URL:
  https://stacks.cdc.gov/view/cdc/180779/cdc_180779_DS1.pdf
• File Type:
  [PDF - 381.14 KB ]