Detection of CD, Pb, and Cu in Non-Pretreated Natural Waters and Urine with Thiol Functionalized Mesoporous Silica and Nafion Composite Electrodes

Details

• Personal Author:
  Addleman RS ; Charnhattakorn B ; Fryxell GE ; Lin Y ; Timchalk C ; Yantasee W
• Description:
  Electrochemical sensors have great potential for environmental monitoring of toxic metal ions in waters due to their portability, field-deployability and excellent detection limits. However, electrochemical sensors employing mercury-free approaches typically suffer from binding competition for metal ions and fouling by organic substances and surfactants in natural waters, making sample pretreatments such as wet ashing necessary. In this work, we have developed mercury-free sensors by coating a composite of thiol self-assembled monolayers on mesoporous supports (SH-SAMMS) and Nafion on glassy-carbon electrodes. With the combined benefit of SH-SAMMS as an outstanding metal preconcentrator and Nafion as an antifouling binder, the sensors could detect 0.5 pp b of Pb and 2.5 pp b of Cd in river water, Hanford groundwater, and seawater with a minimal amount of preconcentration time (few minutes) and without any sample pretreatment. The sensor could also detect 2.5 pp b of Cd, Pb, and Cu simultaneously. The electrodes have long service times and excellent single and inter-electrode reproducibility (5% R.S.D. after 8 consecutive measurements). Unlike SAMMS-carbon paste electrodes, the SAMMS-Nafion electrodes were not fouled in samples containing albumin and successfully detected Cd in human urine. Other potentially confounding factors affecting metal detection at SAMMS-Nafion electrodes were studied, including pH effect, transport resistance of metal ions, and detection interference. With the ability to reliably detect low metal concentration ranges without sample pretreatment and fouling, SAMMS-Nafion composite sensors have the potential to become the next-generation metal analyzers for environmental and bio-monitoring of toxic metals. [Description provided by NIOSH]
• Subjects:
  Biomarkers Environmental Health Environmental Monitoring Environmental Pollution Hazardous Substances Metals Metals, Heavy Occupational Health Poisoning Safety Urine Water Purification

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• Keywords:
  Analytical-instruments Analytical-processes Detectors Electrochemistry Environmental-contamination Environmental-factors Environmental-health-monitoring Heavy-metals Magnetic-properties Metal-compounds Metal-poisoning Metallic-ions Metallic-minerals Metallic-poisoning Metallic-salts Toxic-materials Urinalysis Urine-chemistry Water-analysis

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• ISSN:
  0003-2670
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 10 ; Washington
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  55-63
• Volume:
  6201
• Issue:
  1
• NIOSHTIC Number:
  nn:20034054
• Citation:
  Anal Chim Acta 2008 Jul; 6201(1-2):55-63
• Contact Point Address:
  Pacific Northwest National Laboratory (PNNL), Richland, WA 99352
• Email:
  wassana.yantasee@pnl.gov
• CAS Registry Number:
  Cadmium (CAS RN 7440-43-9) ; Copper (CAS RN 7440-50-8) ; Ferrous oxide (CAS RN 1345-25-1) ; Lead (CAS RN 7439-92-1) ; Mercury (CAS RN 7439-97-6) ; Silver (CAS RN 7440-22-4)
• Federal Fiscal Year:
  2008
• Performing Organization:
  Battelle Pacific Northwest Laboratories
• Peer Reviewed:
  True
• Start Date:
  20060901
• Source Full Name:
  Analytica Chimica Acta
• End Date:
  20090831
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:caaaf3a0f36adbfebaf0610aa6a120f1e5da0f287f1fd4339c1dea53ee3abe1d786553632b84432b9648dda291da84ab31fbbf994a35bfc4d683ab311db6bdf5
• Download URL:
  https://stacks.cdc.gov/view/cdc/189431/cdc_189431_DS1.pdf
• File Type:
  [PDF - 751.35 KB ]