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HYDRANAL Karl Fischer Titration Reagents
Hydranal Reagents
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Sigma-Aldrich reagents for water determination by Karl Fischer titration are sold under the registered trademark HYDRANAL®. HYDRANAL® is a result of our dedicated investigations to improve safety, accuracy and ease of use of the Karl Fischer technique. HYDRANAL® reagents fulfill all requirements of practical laboratory analysis and enable analysts to choose the best reagent for their specific application and instrumentation.
The HYDRANAL® product range consists of one-component and two-component reagents for volumetric determinations, coulometric reagents and specially designed reagents for the determination of water in aldehydes, ketones and other difficult to solubilize substances. The product range is completed by water standards for titer determination (water equivalent) and buffer solutions for maintaining an ideal pH range between 5 and 7.
The HYDRANAL® range of reagents uses imidazole or diethanolamine as a base, rather than noxious pyridine. Imidazole and diethanolamine are both safe and effective and guarantee reliable analyses.
Three important innovations define the HYDRANAL® line:
- Replacement of noxious pyridine with bases that are both safer and more effective
- New reagents and techniques reduce the number of required components, make endpoints clearer and more stable, and give faster and more sensitive reactions
- Safety innovations beyond pyridine replacement include removal of halogenated hydrocarbons and replacement of methanol
The results of Dr. Eugen Scholz and his team’s investigations were of such fundamental importance that patents were issued for many of the new reagents and their use. So far, more than fifty patents have been issued or are pending in Europe, the US, Japan and other countries. Research continues to this day toward the development of new, innovative HYDRANAL â products and working methods.
The results of the investigations by Dr. Scholz and his team have been published in both English and German by Springer Verlag [1].
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