Functional principle of behrtest cyanide distillation

System for the determination of total cyanide: In the presence of copper(I)ions, the cyanide compounds are decomposed to hydrogen cyanide at boiling temperature.

Hydrogen cyanide is expelled with an exactly defined vacuum through-flow current and absorbed in sodiumhydroxide. The exactly set through-flow current is important and the behr-typical processing of the absorption vessel in terms of through-flow opening.

Determination takes place according to the following standards:

EPA 9010 B (Total and amenable cyanide: Distillation)

ISO 11262 (Cyanide in soil and solids)

DIN 38405-D 13 (Total cyanide in water)

DIN 38405-D14 (Cyanide in drinking and surface water)

DIN 38404-D7 (Cyanide in low contaminated water - ion chromatography)

The evaluation is performed by

photometer | titration | ion chromatography (DIN 38404-D7)

Total cyanide is the total of the simple and complex cyanides.

The separation process in acc. with DIN 38405-D 14 is applicable for drinking water, raw water for drinking water preparation, low contaminated soil and surface water. The mass concentration of cyanide compounds should not exceed 1 mg/l.

Procedure basis: The easily releasable cyanide is separated from the sample with the aid of a precisely metered vacuum airflow at room temperature and a pH value of 4 as hydrogen cyanide. Hydrogen cyanide is absorbed in the behrotest absorption vessel ASH/CY in potassium hydroxide and then after reaction with barbituic acid-pyridine

As easily releasable cyanide and all compounds that separate hydrogen cyanide at room temperature and a pH value of 4.