Filtro de Aplicações

Generally speaking, the gas extraction or oven method can be used for all samples which release their water when they are heated up. The oven method is indispensable in cases in which the direct volumetric or coulometric Karl Fischer titration is not possible, either because the sample contains disruptive components or because the consistency of the sample makes it very difficult or even impossible to transfer it into the titration vessel. The present Application Bulletin describes automatic water content determination with the aid of the oven technique and coulometric KF titration, using samples from the food, plastic, pharmaceutical and petrochemical industry.

Polyols are important raw materials in polyurethane production. Contamination in the raw materials have a great influence on reactions and impair the quality of the end product. Alkali metals are particularly strong catalysts for linear or branched reactions. A rapid and precise method for their simultaneous determination is ion chromatography following Inline Matrix Elimination.

1,3,5-trioxane is a heterocyclic compound formed by trimerization of formaldehyde. Trioxane is used for the production of polyformaldehyde plastics such as poly(oxymethylene) (POM) and solid fuels. Aqueous 1,3,5-trioxane solutions frequently contain trace triethylamine that requires quantification. This is performed on the Metrosep C 3 - 250/4.0 column with subsequent direct conductivity detection.

Luvas de látex são usadas em ambientes de salas limpas para evitar contaminações. O uso de luvas que liberem halogenetos ou sulfatos corrosivos é proibido em usinas nucleares. O teor total de halogênio e enxofre é determinado por meio de cromatografia de íons de combustão. Um teste de eluato é realizado para verificar a porcentagem eluível de halogênios e sulfato das luvas. A preparação da amostra é composta de pré-concentração e eliminação da matriz (MiPCT-ME), conforme descrito em AN-S-304. Palavra-chave: pirohidrólise

O poliisobuteno (PIB) é uma matéria-prima importante para uma grande variedade de produtos. O controle de qualidade requer a determinação do teor de flúor. Essa tarefa é facilmente realizada pelo Metrohm Combustion IC aplicando tecnologia de sensor de chama e Eliminação de Matriz em Linha. Palavra-chave: pirohidrólise

As folhas de éster de celulose são produzidas usando solventes clorados. A quantidade residual do solvente usado na produção evapora em poucos dias em condições ambientais. O solvente residual é determinado pela combustão IC, através da conversão de cloro organicamente ligado em cloreto por piroidrólise. O produto final precisa estar livre de solventes clorados. Portanto, conteúdos críticos de tais compostos podem ser detectados na análise de controle de qualidade. A aplicação do MiPT neste estudo permitiu uma calibração automatizada e precisa a partir de um único padrão.

Organic halides must be monitored in the environment. Combustion ion chromatography (CIC) is used for accurate halogen analysis in solids following EN 17813:2023.

A reference electrode has a stable and well-defined electrochemical potential (at constant temperature), against which the applied or measured potentials in an electrochemical cell are referred. A good reference electrode is therefore stable and non-polarizable. In other words, the potential of such an electrode will remain stable in the used environment and also upon the passage of a small current. This application note lists the most used reference electrodes, together with their range of use.

In the application note AN-EIS-004 on equivalent circuit models, an overview of the different circuit elements that are used to build an equivalent circuit model was given. After identifying a suitable model for the system under investigation, the next step in the data analysis is estimation of the model parameters. This is done by the non-linear regression of the model to the data. Most impedance systems come with a data-fitting program. In this application note, the way NOVA is uses to fit the data is shown.

In this application note, the advantage of recording the raw time domain data for each individual frequency during an electrochemical impedance measurement is described.