Metrohm 2.946.0010, Manual

Page: 42 / 81

5.2 Carrying out the determination of As(total) according to Application Bulletin 416
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34
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NOTICE
It is recommended to use only reagents of highest quality, e.g. Merck
suprapur
®
or Honeywell/Fluka TraceSelect
®
. The water for preparation
of reagents and for rinsing should have ultrapure quality (resistivity >18
M
Ω·
cm (25 °C), type I grade (ASTM D1193)).
Setup the hardware as described in Chapter 4.2 Hardware installation
(page 15) . Make sure that the battery is fully charged.
Establish the connection between software and potentiostat as described
in
Chapter 4.4 Connecting the software with the instrument (page 22) .
In daily operation the measuring head module consisting of measuring
head
(3-
7
) , scTRACE Gold electrode (3-
10
) , stirrer (3-
6
) and transparent
ring (3-
4
) can stay assembled. Only if the stirrer needs to be replaced, the
transparent ring has to be removed.
Figure 12 Operation of measuring stand