In-situ LIF Analysis of Biological and Petroleum-based Hydraulic Oils on Soil

Abstract

Absorption and fluorescence properties of 4 hydraulic oils (3 biological and 1petroleum-based) were investigated. In-situ LIF (laser-induced fluorescence) analysis of theoils on a brown sandy loam soil was performed. With calibration, quantitative detection wasachieved. Estimated limits of detection were below ca. 500 mg/kg for the petroleum-basedoil and ca. 2000 mg/kg for one biological oil. A semi-quantitative classification scheme isproposed for monitoring of the biological oils. This approach was applied to investigate themigration of a biological oil in soil-containing compartments, namely a soil column and asoil bed.

Keywords

• in-situ optical oil sensor
• lubricants
• hydraulic oils
• soil
• laser induced fluorescence