The calibration with H2S/Sulphide standard solutions, produced by step
by step dilution of a stock solution, is uncertain because of the high
reactivity of such solutions. These disadvantages could be avoided, if
the standard solutions are generated electrochemically.
The H2S-/Sulphide generator allows the stepless and
dynamic on line production of standard solutions with very high accuracy
and reproducibility at variable flow rates. A weight out of highly instable
analyte substances (e.g. Na2S) is not necessary. Accidents in the laboratory
caused by the production of highly concentrated stock solutions may be
avoided, because only really needed small amounts of highly diluted H2S
standards are generated.
Because in any case oxygen-free carrier solutions are needed, the generator
is available in two versions: one with integrated degassing device and
another one without. The generator without degassing device requires solutions
permanently bubbled with inert gas (nitrogen or argon).
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