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Solvent Choices for Infrared Testing of Oil and Grease in Water

From Wilks Enterprise, Inc.

Water is a very strong absorber in the mid infrared (IR) region where oil is measured. We see the effect of infrared absorbance when a cold bucket of water is left in the sun is quite warm by afternoon due to the absorption of infrared energy as heat. When measuring part per million (ppm) oil levels with mid IR, the water absorbs so much of the infrared energy that the signal becomes saturated and low oil levels cannot be detected. The oil in the sample needs to be separated from the water in order to make a measurement. Typically, the oil is extracted into a solvent and then measured either directly in the solvent or the residual oil is measured after solvent evaporation.

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Oil Sensors and Analyzers
Oil sensors and oil analyzers are used in automotive or industrial machinery applications to sense oil levels, and check for contamination, and particulates, viscosity and/or temperature.
Oil in Water Monitors
Oil in water monitors are used to detect the presence of hydrocarbons in water.
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