Water Determination in Crude Oil by Karl Fischer Titration

Crude oil, due to its complex composition, requires different solvents to aid solubility: chloroform to dissolve the oil and xylene to dissolve the tar components. If the tar is not finely dispersed, it can coat the electrode which leads to indication problems.

From the analysis of many different oils, we have learnt that intensive homogenisation of samples using a homogenizer or by ultrasound is a fundamental prerequisite for reproducible results.

According to ASTM D 4377-00, in analysis using a pyridine-free reagent, a mixture of a KF solvent (for example Hydranal-Solvent) and xylene must be added to the titration vessel. Hydranal-Solver (Crude) Oil fulfils all these requirements. Besides volumetric method we tested also coulometric titration where Hydranal-Coulomat Oil successfully worked in cell with diaphragm.

Download the full Laboratory Report for Crude Oil (L 108) here

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Volumetric reagents: Coulometric reagents: Auxiliaries:
34805 HYDRANAL-Composite 5
34697 HYDRANAL-Solver (Crude) Oil
34849 HYDRANAL-Water Standard 10.034425 HYDRANAL-CRM Water Standard 10.034828 HYDRANAL-Water Standard 1.034426 HYDRANAL-CRM Water Standard 1.034696 HYDRANAL-Standard Sodium Tartrate Dihydrate34424 HYDRANAL-CRM Sodium Tartrate Dihydrate
34868 HYDRANAL-Coulomat Oil 34807 HYDRANAL-Coulomat A 37866 HYDRANAL-Xylene 34840 HYDRANAL-Coulomat CG 34828 HYDRANAL-Water Standard 1.034426 HYDRANAL-CRM Water Standard 1.034446 HYDRANAL-Water Standard 0.1 PC 34241 HYDRANAL-Molecular Sieve 0.3 nm34788 HYDRANAL-Humidity Absorber
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