Aplicações

This Application Bulletin provides information regarding the MATi 10 (Metrohm Automated Titration) system. MATi 10 is a completely configured system for automatic volumetric Karl Fischer titration with which the water content in liquid and solid samples can be determined. Up to 24 samples can be analyzed directly in 75 mL titration vessels. The samples are weighed into the titration vessels and covered with an aluminum foil. This prevents falsification of the water content.

A anodização sulfúrica tartárica (TSA) é uma técnica estabelecida para proteção contra corrosão na indústria aeroespacial. É uma alternativa ao processo de anodização crômica prejudicial ao meio ambiente. Como tal, é necessário um método para monitorar os níveis de ácido sulfúrico e ácido tartárico em banhos de revestimento TSA. Métodos de titulação potenciométrica foram desenvolvidos e são amplamente utilizados em toda a indústria. Sua desvantagem é que são necessárias duas titulações com eletrodos e solventes diferentes. Nesta Nota de Aplicação é apresentado um método alternativo, onde a concentração de ambos os ácidos é determinada em sequência utilizando um sensor termométrico. Em comparação com a titulação potenciométrica, a titulação termométrica é mais rápida e conveniente (não requer manutenção do sensor). Num sistema totalmente automatizado, a determinação de ambos os parâmetros demora cerca de 7 minutos.

Metal-organic compounds are commonly used in organic chemistry, for example as Grignard reagents or as strong bases (e.g., butyl lithium compounds). The knowledge of the exact content of reactive species allows to better plan the required amounts for reactions preventing the waste of material or too low yields. This Application Note describes the analysis of metal organics by thermometric titration using 2-butanol as titrant. Due to the strongly exothermic nature of the reaction between 2-butanol with metal-organic compounds, a fast and quantitative analysis of these substances is possible.

Automated determination of the zirconium content of zirconium acetate, as well as other zirconium compounds which can be rendered soluble as zirconium acetate.

Determination of sodium, ammonium, potassium, calcium, and magnesium in betaine using cation chromatography with direct conductivity detection.

Determination of diethylamine and trimethylamine using cation chromatography with MS detection.

Chromate (Cr(VI)) is considered toxic and potentially carcinogenic, which is why its concentrations in children's toys should be kept as low as possible. The EU directive 2009/48/EC defines limit values for the migration of chromate from children's toys. The hydrochloric-acid-containing migration solution is diluted with a buffer. 2000 μL of this solution are injected automatically using intelligent preconcentration technology and matrix elimination. Detection takes place via ICP/MS.

Determination of chloride, nitrite, nitrate, and sulfate in betaine using anion chromatography with conductivity detection after chemical suppression.

Determination of iodate, chlorite, bromate, and nitrite using suppressed anion chromatography with UV/VIS detection after post-column reaction.

Rapid inline monitoring of the major SC1/SC2 bath constituents is possible with reagent-free near-infrared spectroscopy, e.g., the 2060 The NIR-R Analyzer.