Function and design
HS 55 (Batch Mode)
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All functionally relevant assemblies are located on the front plate of the batch functional
module:
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1-channel hose pump for the reduction agent transport
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Batch module as reaction unit
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Push button to start the measuring process
The pump hose is also located here. It is easily accessible and can be replaced by the
user. The colored line on the front plate identifies the hose routing and thereby facili-
tates maintenance.
Figure 2 Front view with main assemblies
1 Batch module with reaction beaker
2 1-channel hose pump
3 "Start" push button
4 Basic module
The 4-valve group for gas supply is located on the inside of the functional module. On
the right-hand side of the device is the storage bottle for the reduction agent in a
holder. The electrical connections are also located here.
The optional mercury enrichment module is inserted into the functional module from
above and electrically connected to it. The hoses are routed to the frame of the func-
tional module and from there to the front plate. When changing between the "Hydride
(batch)"/"Hg without enrichment (batch)" and "Hg with enrichment (batch)" modes, you
only change the hose routing on the front plate.
Supply the sample manually into the Hg/hydride system. To do so, pipette a volume of
1 to 20 ml into the reaction beaker and clamp the reaction beaker to the head of the
batch module with a slight rotation so that it is gastight.
After the analysis has started, the 1-channel hose pump meters the reduction agent au-
tomatically into the reaction beaker. The fast and partly vigorous reaction releases
gaseous metal hydride or atomic Hg vapor. Hydrogen is formed as a by-product during
the reaction with NaBH
4
.
Argon is used as the carrier and purge gas. The argon flow transports the reaction prod-
ucts either directly to the AAS device or to a gold collector for Hg enrichment. The en-
riched mercury is released during the bake-out of the gold collector and transported to
the atomizer by a directly connected argon flow.