Endress+hauser Conducta Gmbh+co. Kg

Endress+hauser Conducta Gesellschaft Fur Mess- Und Regeltechnik Mbh+co. Kg

Endress + Hauser Conducta Gesellschaft Für- Und Regeltechnik Mbh + Co. Kg

Andrea Gross

Ulrich Kathe

Anja Gerlinger

Ralf Steuerwald

Thomas Schipolowski

A method for removing chloride from samples containing volatile organic carbon, wherein a chloride containing sample is mixed with a difficulty volatile acid, wherein hydrochloric acid gas arises, which is present in dissolved form in a sample-acid mixture and then the hydrochloric acid gas is purged by a carrier gas from the sample-acid mixture, wherein the hydrochloric acid gas is removed from the carrier gas following the purging and the carrier gas is fed back to the sample-acid mixture. In order during the hydrochloric acid purging largely to suppress the driving out of easily volatile organic compounds, the sample-acid mixture has a temperature of approximately 3&#xb0; C. to 30&#xb0; C., wherein, following the purging from the sample-acid mixture, the hydrochloric acid gas is removed from the carrier gas by absorption with water.

Method and apparatus for removing chloride from samples containing volatile organic carbon

The invention relates to a method for calibrating and/or adjusting an analytical device for chemical substances. A predetermined concentration of a chemical substance in a reference liquid is measured by mixing the reference liquid with a reagent for producing a color change, followed by irradiating with light of a predetermined wavelength. Based on the absorption of the light by the reference liquid, a concentration is determined, which is compared with the predetermined concentration of the reference liquid. In the case of which a calibrating and/or adjusting associated with the measurement process is possible without long interruptions of the measurement process, the predetermined concentration of the reference liquid is gained by mixing at least two standard, which contain different concentrations of the chemical substance.

Method for calibrating and/or adjusting an analytical device for chemical substances in liquids, especially in aqueous solutions

A method for removing chloride from samples containing volatile organic carbon, wherein a chloride containing sample is mixed with a difficultly volatile acid, wherein hydrochloric acid gas arises, which is present in dissolved form in a sample-acid mixture and then the hydrochloric acid gas is purged by a carrier gas from the sample-acid mixture, wherein the hydrochloric acid gas is removed from the carrier gas following the purging and the carrier gas is fed back to the sample-acid mixture. In order during the hydrochloric acid purging largely to suppress the driving out of easily volatile organic compounds, the sample-acid mixture has a temperature of approximately 3&#xb0; C. to 30&#xb0; C., wherein, following the purging from the sample-acid mixture, the hydrochloric acid gas is removed from the carrier gas by absorption with water.

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Wiernzheim-Serres, Germany

Andrea Gross