Understanding Oil-in-Water Instrument Specifications

17 February 2011 by Turner Designs Hydrocarbon Instruments

The measurement capabilities of oil-in-water analysis methods are described by several analytical figures-of-merit. Examples are:

• Range (linear and dynamic) limit of detection (LOD)
• Limit of quantification (LOQ) precision (repeatability and reproducibility) sensitivity accuracy response time

Some or all of these are often specified by customers in the bid packages issued when selecting a grab-sample method or a continuous oil-in-water monitor. The specified figures-of-merit are often ill-defined, inconsistent, incomplete or analytically unreasonable. This is probably due to a general lack of understanding of their definitions and how the values relate to the ability of the instrument to perform in a given application.

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