ABSTRACT
Field laser-induced fluorescence excitation–emission matrix (LIF-EEM) data were transferred to Microsoft Excel for data manipulation. Data were then subjected to pretreatment including removal of backscattered laser excitation, baseline subtraction, and energy normalization using a streamlined routine that accomplished these procedures at a rate of less than 1 second per file. For LIF data, the fluorescence signals at 340 nm were analyzed and compared to the laboratory data of naphthalene and diesel range organics. Both on-site and in situ LIF data indicated that the most contaminated zone occurs between the depths of 9 to 11 feet bgs. LIF measurement is nondestructive, so laboratory and LIF results are available on the same soil samples. A simplified presentation of the multichannel LIF data shows plots of total fluorescence detected in each excitation channel vs. depth. The quantitative relationships between the data sets do not remain constant as a function of depth.
