In situ laser-induced fluorescence (LIF) analysis of petroleum product-contaminated soil samples

Abstract

General considerations of the calibrations of in situ measurements are presented and the concept of using an "average oil" with average analysability for calibration purposes is introduced. The in situ analysis of 30 petroleum product-contaminated soil samples with laser-induced fluorescence (LIF) spectroscopy was performed. Compared to an uncontaminated laboratory reference (LR) soil, 23 soil samples exhibited significantly higher LIF signals, so that these soil samples were classified as contaminated. The repeatability and reproducibility of the in situ LIF analysis were investigated. For the calibration of the LIF data, two LR oils (a fuel oil and a crude oil) were employed. The degree of soil contamination with petroleum products ranged from the limit of detection (LOD) for LIF analysis (ca. 100 ppm), or below, to more than 10,000 ppm. The petroleum product concentrations determined with in situ LIF analysis reveal a reasonable correlation with the results of standard IR analysis after extraction of the contaminated soils.

Laser-Induced Fluorescence (LIF) Spectroscopy for the In Situ Analysis of Petroleum Product-Contaminated Soils

“…This is in accordance with an estimated detection limit of ca. 100 ppm for our LIF analysis of soils (Löhmannsröben 2000). The analogous plot of I F vs. TPH content for the waste materials (right part of Figure 5.9) clearly depicts enhanced deviations of the data points from the line with slope unity.…”

Aplicação do método de fluorescência induzida por laser na caracterização de áreas contaminadas com resíduos oleosos

“…O LIF representa uma ferramenta eficiente para identificação semiquantitativa de hidrocarbonetos na fase móvel, trapeado ou residual em sub-superfície, como demonstrado por diversos trabalhos, incluindo Löhmannsröben & Roch (2000), Lamb (2012), Isler et al (2013), Suthersan et al (2016). As vantagens do emprego LIF incluem menor tempo de investigação, aquisição de informações de modo contínuo no intervalo de profundidade investigado e possibilitar a modificação da malha de amostragem em razão dos resultados obtidos em tempo real durante a investigação, possibilitando um diagnóstico ambiental mais consistente e conclusivo.…”

“…A intensidade da fluorescência pode ser correlacionada com a quantidade de hidrocarbonetos poliaromáticos (HPAs) no solo (LÖHMANNSRÖBEN & ROCH, 2000). Entretanto, em razão da não identificação de HPAs no solo, não foi possível correlacionar quantitativamente os resultados do LIF com as concentrações de HPAs no solo.…”

Use of ultrabright LEDs for the determination of static and time-resolved florescence information of liquid and solid crude oil samples

“…[6] and references therein. LIF of petroleum products and the effect of humic substances has also been studied by Löhmannsröben and Roch [7], Zimmermann et al [8] and Illenseer et al [9]. Hegazi et al [10,11] used time-resolved LIF with a 250 nm YAG-pumped MOPO laser system to characterise crude oil samples.…”