In-Situ Detection of Contaminant Plumes in Ground Water
Abstract
Ground-water contaminants can be detected in situ by making spectroscopic measurements through fiber optics. In addition to direct measurements, it is possible to couple fiber optics with chemical indicators that interact with the contaminants to enhance their detectability. Direct fluorescence measurements have been used to sensitively detect aromatic hydrocarbons in fossil fuels. Direct Raman measurements are also possible but only detect relatively high concentrations 0.1%. Parts per billion levels of nitroaromatics and halogenated hydrocarbons can be detected using indicators that react to form colored products. The rate at which the absorbance of the colored product increases is proportional to concentration. Refractive index measurements offer a rugged reversible approach to detecting organic contaminants in the low part per million range. All of these techniques require further development before they can be reliably used on a routine basis. Other spectroscopic techniques are considered in the report but are not considered ready for in-situ ground-water monitoring at this time.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1990
- Accession Number
- ADA228973
Entities
People
- W. R. Seitz
Organizations
- University of New Hampshire