The dangerous material such as the material which possesses harmful influence the vacuum closed housing the device null which executes manner and this manner which

摘要

The device comprises a recipient or cell (1) into which the said liquid (24) is placed with a basic reaction product to volatilize the gaseous form (4) of the said product in the said cell (1), and at least a second recipient or cell (2) into which a receiving solution (25) is placed for which the value of a parameter representing the desired concentration is known, said concentration being measurable by a measurement system (6) associated with this at least second cell (2). A sealed closed circuit (10) recirculates the recuperated gas (11) in the upper space (12) of the at least second cell (2) towards and into the liquid medium (24) in the lower space (13) of the first cell (1). An injection means (7) for the gas (4) volatilized in the first cell ensures that this gas is directed towards and redisolved in the liquid medium (25) of the next cell.