A Case Study of Field Screenign for Petroleum, Oil,a nd Lubricant (POL) Contaminants Using the SCAPS Laser-Induced Fluorescence Cone Penetrometer System

摘要

The objective of this paper is to provide field results for comparison between two laser sources for in situ laser-induced fluorescence (LIF) screenign of petroleum, oil, and lubricant (POL) contamination using the Navy's Site Characterization and Analysis Penetrometer System (SCAPS). The SCAPS consists of an LIF chemical sensor integrated with a cone pentrometer. The technology is briefly described, followed by a general description of the field site. Pre-push standard check measurements are compared between the systems. Measures of reproducibility for the in situ fluorescent intensity data are established for a xenon chloride (XeCl) laser and used to compare field performance between the XeCl and nitrogen laser sources. The standard SCAPS field practice is to collect a small number of confirmatory samples for analytical laboratory measurement. These measurements are presented, confirming the LIF observations. Spectral data for the two Systems is compared, revealing a slight spectral shift in the resultant fluorescence. For the subsurface soil and contaminant conditions encountered at the site, the XeCl and nitrogen laser systems performed comparably. The in situ SCAPS field screening method provides a much more comprehensive picture of site contamination due to the greater depth resolution inherent in the LIF measurement, the to sampling plan decisions made in the field from the real-time data.