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Electrochemical Determination of Water in Environmental Hydraulic Fluids Using the Karl Fischer Reaction

Electrochemical Determination of Water in Environmental Hydraulic Fluids Using the Karl Fischer Reaction

A Cedergren, M Lundström

Anal Chem. 1997 Oct 1;69(19):4051-5.

PMID: 21639214

Abstract:

Different procedures based on the Karl Fischer reaction were investigated with respect to their applicability for water determinations in environmental hydraulic fluids: (i) continuous coulometry using a recently described diaphragm-free cell; (ii) on-line stripping of water at elevated temperature using either continuous coulometry or direct potentiometry for detection of the liberated water. Except for one of the oils, Statoil PA, which is a poly(α-olefin) with certain polymers added, no significant difference was found among coulometry using an optimized imidazole-buffered methanolic reagent containing 75% (v/v) chloroform, the two different stripping techniques (working in the temperature interval 100-110 °C), and the commercially available Hydranal Coulomat AG-H. The high stability and sensitivity of the coulometric technique described made it possible to work with sample amounts in the low milligram-range, and this is shown to increase the reliability of the coulometric method as compared to normally used procedures.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
TIT9319	Coulomat C			Price

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