Metrohm 850 Professional IC Cation - Prep 2 - Manual (Page 20)

2.3 Flow diagram
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850 Professional IC – Cation – Prep 2
8 Install sample path connections.
￭ Connect the sample degasser (if required) (see Chapter 2.13,
page 43).
￭ Installing sample preparation (see Chapter 2.3, page 10).
￭ Connect sample path connections to the injection valve (see
Chapter 2.15.2, page 50).
9 Connect detector capillaries (see Chapter 2.17, page 54).
10 Mains connection (see Chapter 2.18, page 56).
11 Connect the instrument to the PC (see Chapter 2.18.1, page 56).
12 Initial start-up (see Chapter 3.1, page 61).
13 Install the guard column (if used) (see Chapter 2.19, page 57).
14 Install the separation column (see Chapter 2.20, page 59).
2.3 Flow diagram
Figure 2 Flow diagram for matrix elimination with transfer procedure and
Figure 3 Flow diagram for standard addition with preconcentration.
show the flow paths for two with the 2.850.1050 performable analysis
technologies. The arrangement of the modules in the diagram corre-
sponds to the front view of the instrument. Liquid containers (eluent bot-
tle, sample vessel, waste container, auxiliary solutions container) and
guard column (see Chapter 2.19, page 57) are not shown in the dia-
gram. Which pressure screws, connections and couplings are used, is
described in the installation chapters of the individual modules.
Matrix elimination with transfer procedure
This sample preparation technology is applied when the sample matrix
could damage the separation columns (and the analyte ion content is in
the ppm range).
For this, a small, defined sample amount is measured at an additional
injection valve (2-12) and pumped with a transfer solution (ultra pure
water) to the preconcentration column (2-17) at the injection valve (2-7).
The sample is retained by preconcentration column, while the matrix is
rinsed into the drain with the transfer solution. After a predefined time,
the injection valve (2-7) is switched to <Inject> and data recording is star-