Metrohm 793 IC Sample Preparation Module - Manual (Page 5)

1.1 Instrument description
793 IC Sample Prep Module/ 8.793.1003 Instructions for Use
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1 Introduction
1.1 Instrument description
The 793 IC Sample Prep Module consists of a reactor block (SP
Module A) with its corresponding control unit; this contains an addi-
tional 2-channel peristaltic pump.
Inline sample pretreatment like neutralization or cation exchange for ion
chromatographic analyses can be carried out with the cation exchanger
built into the SP Module A. The SP Module A contains three cation ex-
change units which are in turn used for cation exchange, regenerated
with acid and rinsed with water. In order to perform each analysis under
comparable conditions a freshly regenerated cation exchange unit is
normally used. Switching is either carried out automatically by the IC
system or manually. Due to possible interference of sulfate with the IC
determination, perchloric acid is normally used for cation exchanger re-
generation of the SP Module A instead of sulphuric acid.
At the control unit the SP Module A can either be switched to the next
position manually or by remote control via the remote interface. The
built-in peristaltic pump, which delivers the solutions required for oper-
ating the SP Module A, can also be switched on by remote control or
manually.
The 793 IC Sample Prep Module is particularly suitable for retrofitting a
modular anion IC system for inline sample pretreatment in a simple
manner. Two typical applications are described in detail in these in-
structions for use: Neutralization (e.g. exchange of Na + by H + ) and
Cation Separation (e.g. exchange of heavy metals by H + ). Of course
the 793 IC Sample Prep Module can also be combined with all other
HPLC components currently on the market.
Although in principle the techniques of cation exchange by the 793 IC
Sample Prep Module and suppression by the 753 Suppressor Module
are comparable, the 793 IC Sample Prep Module is not suitable for
chemical suppression after ion chromatographic separation of anions.