Methods for determining water content in oil
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Are there any other methods, other than Karl Fischer, that use chemical reagents but do not require the purchase of equipment, for determining small amounts of water in the oil phase?
You can refer to GB/T 260; the required instruments are also inexpensive. It’s not clear whether they are suitable for analyzing your samples.
Solvent distillation using the GB/T 260 method can detect water contents as low as 0.5%, but such a level of water content provides insufficient sensitivity for oil refining processes. This method is primarily intended for crude oil and oils with high water content; it is not suitable for measuring the water content in raw materials and products used in the refining process. The Karl Fischer method is a classic chemical volumetric or electrochemical analysis technique with a wide measurement range and sensitivity reaching the ppm level; it is suitable for product control and process monitoring in the oil refining process. Other methods for measuring the water content in oil may not be standard methods, and for process control and product quality testing, it is essential to comply with standards and specifications.