15 research outputs found
The Development of a Sub-Surface Monitoring System for Organic Contamination in Soils and Groundwater
A major problem when dealing with environmental contamination is the early detection and subsequent surveillance of the contamination. This paper describes the potential of sub-surface sensor technology for the early detection of organic contaminants in contaminated soils, sediments, and landfill sites. Rugged, low-power hydrocarbon sensors have been developed, along with a data-logging system, for the early detection of phase hydrocarbons in soil. Through laboratory-based evaluation, the ability of this system to monitor organic contamination in water-based systems is being evaluated. When used in conjunction with specific immunoassays, this can provide a sensitive and low-cost solution for long-term monitoring and analysis, applicable to a wide range of field applications
Early detection and monitoring of fuel leaks
EThOS - Electronic Theses Online ServiceGBUnited Kingdo
Early detection and monitoring of fuel leaks
A novel integrated detection system· has been developed to protect the environment from
hydrocarbon fuels leaking from large-scale storage facilities. Over the last decade, land and
subsequent groundwater contamination from hydrocarbon fuels has been identified as the major
threat to drinking water resources across Europe and the United States. The integrated system
developed within this work has two main components: (1) 'Early warning' free-phase fuel leak
detection sensors; (2) A novel immunoassay field test for rapid, in situ follow-up analysis of
contaminated sites through determination of the extent of the contamination and early indication
of dissolved-phase fuel migration.
(1) A prototype optical reflectometric device has been developed, in conjunction with state-of the-art data acquisition and relay technology to provide a simple, low-cost hydrocarbons
monitoring solution. In extensive field trials, this system has been evaluated as a multiple-array,
sub-surface, remote leak detection and monitoring system for early detection of free-phase
hydrocarbon contamination. The sensors respond to all. free phase hydrocarbons and can
determine plume movement through soil. Preliminary leak information from these sensors can
be combined with subsequent, quantitative site analysis using the immunoassay to provide an
integrated, highly sensitive and low-cost solution for long term monitoring and analysis.
(2) A novel ELISA has been developed for detection of the most controversial fuel oxygenate - \
methyl tert-butyl ether (MTBE), identified as the most major threat to groundwater (and
consequently drinking water) resources above any other hydrocarbon contaminant. The ELISA
is a classical competitive immunoassay involving free MTBE and a novel antigen consisting of
an MTBE analogue covalently bound to BSA. The ELISA was optimised and transposed into a
magnetic bead format, the detection range was 0.5-5000 ppm (IC50 5 ppm, assay time 65
minutes). Also detectable are MTBE degradation products TBA, TBF and alternative fuel
oxygenates TAME, DIPE and ETBE. MTBE is highly soluble in water and so is an excellent
marker for assessing the extent of site contamination.
This integrated detection system potential provides a sensitive, cost-effective solution for early
detection, analysis and surveillance of petroleum fuel contamination in a range of applications.Ph