A new approach for measuring water concentration in oil using copper sulfate powder and infrared spectroscopy.

An approach for measuring water concentration in oil, based on the use of CuSO particles and infrared spectroscopy, is described. The particles interact with both dissolved water and water droplets to form the monohydrate, CuSO·HO. These particles are collected on an infrared transparent membrane and then an infrared spectrum in transmission mode is recorded.

Measurement of water concentration in oils using CaO powder and infrared spectroscopy.

A simple method for measuring water concentration from 1 to 10000 mg L is described. The approach involves adding CaO powder to an oil sample and measuring the amount of Ca(OH) produced by the reaction of CaO with water. Collection of the powder occurs by passing a fixed volume of the oil through an infrared transparent membrane and the amount of water is determined from the intensity of the OH stretching mode of Ca(OH) at 3645 cm.

A reagentless and rapid method to measure water content in oils.

A simple method for measuring water levels from 1 mg L to 5000 mg L in oils that uses no chemical reagents or matrix specific calibrations is described. The approach involves capturing the water from the oil on an infrared transparent membrane and then recording an IR spectrum in transmission mode through the membrane. A classic spectrum of liquid water is obtained for all oil types, as both dissolved water and emulsion-based water are extracted to form an adsorbed layer of water on the membrane surface.