Aplicações da Titulação Karl Fischer
A titulação Karl Fischer, ou titulação KF, é o método analítico testado e comprovado para determinar a quantidade de água (umidade) em amostras. Nossos especialistas em aplicações compilaram diversos documentos sobre a titulação KF volumétrica e coulométrica em vários setores, como alimentos e bebidas, produtos farmacêuticos ou polímeros e plásticos.
Use os filtros para pesquisar as aplicações de Karl Fischer por matriz de amostra, norma ou setor.
- AN-K-074Water content in crude oil determined with Karl Fischer titration
To determine water in crude oil, ASTM D4928 recommends coulometric Karl Fischer titration with the oven method, allowing full automation for high reproducibility.
- WP-089Water content determination in ketones using Hydranal™ NEXTGEN FA reagents
With Hydranal™ NEXTGEN FA reagents, the water content in ketones can be determined quickly and reliably. Compared to other existing KF reagents for ketones on the market, the side reactions are measurably better suppressed.
- TA-061Two webinars on Karl Fischer titration: Fundamentals and Troubleshooting
Karl Fischer titration performs specific and precise water determinations. This is why it is numbered among the most frequently used laboratory methods throughout the world. The accompanying articles for the two webinars on basic principles and troubleshooting with respect to titration summarize certain core information that they contain, including among other subjects the handling of electrodes, the conditioning of titration cells and the significance of drift for Karl Fischer titration.
- AN-K-073Volumetric Karl Fischer titration with Scharlau Aquagent® reagents
Test measurements on water standards are performed with an OMNIS KF Titrator and Karl Fischer reagents Aquagent® Complet 5 and Methanol Fast from Scharlau.
- WP-084Quality control of analytical parameters in battery production
Lithium-ion batteries (LIBs) are the most common rechargeable options available today. Production of LIBs needs to follow stringent quality standards.
- AN-K-071Water content in flour, dough, and bread
Water content determination by volumetric Karl Fischer titration is one of the most important analyses worldwide, particularly when it comes to food quality. This parameter has a major influence on the growth of microorganisms, and thus indirectly affects the storability of the raw materials and final products. Consistent quality is only possible with precise measurements during the process. This measurement is performed with the Metrohm Eco KF Titrator for flour, dough, and baked goods.
- AN-K-07234433 HYDRANAL™ NEXTGEN Coulomat AG-FI
Karl Fischer reagents contain buffer substances (usually imidazole) since the reaction constant is dependent on the pH value. A constant pH therefore ensures the most repeatable results. In 2015, imidazole was classified by European Union the as a CMR (carcinogenic, mutagenic or toxic) substance and the statement H360D was added, stating possible harm to fertility or a fetus. Meanwhile, other reagents free of imidazole are available for purchase. This Application Note summarizes test measurements with 34433 HYDRANAL™ NEXTGEN Coulomat AG-FI.
- AN-K-070Water in petroleum products
Moisture in petroleum products causes several issues: corrosion and wear in pipelines and storage tanks, an increase in debris load resulting in diminished lubrication, blocked filters, or even harmful bacterial growth. As a result, increased water content can lead to infrastructure damage, higher maintenance costs, or even unwanted downtimes. Coulometric Karl Fischer titration is the method of choice for low water content in petroleum products. Using a Karl Fischer oven to vaporize the water present in the sample prior to titration not only greatly reduces matrix interferences, it can also be fully automated. This allows a reliable and cost-efficient analysis of the water content according to ASTM D6304 (Procedure B) in products such as diesel, hydraulic oil, lubricant, additive, turbine oil, and base oil.
- AN-K-068Water content determination and acid-base titration in parallel
The water content determination by volumetric Karl Fischer titration is one of the most important analyses worldwide. Using an OMNIS system consisting of an OMNIS Titrator and an OMNIS Sample Robot, the fully automatic analysis of water content is possible in various products and matrices. The OMNIS Sample Robot is capable of running several different titrations in parallel. In this Application Note, we present the results of a volumetric Karl Fischer titration run in parallel to an aqueous acid-base titration on the same system. The water content is not influenced by the parallel running aqueous titration, allowing the combination of potentiometric titrations and Karl Fischer titrations on the same automated system.
- AN-K-048Sample preparation with the oven technique – relative blank
Large sample sizes can lead to subtraction of too high blank values. This Application Note describes the calculation of a relative blank and thus helps to improve the accuracy of the method.
