1 electrical connection – Metrohm 793 IC Sample Preparation Module User Manual

Page 14

2 Installation

793 IC Sample Prep Module/ 8.793.1003 Instructions for Use

2.3

Connection to a Modular IC System for
Neutralization

An important application for the 793 IC Sample Prep Module is neutrali-

zation of an alkaline sample for anion determination by IC with chemical

suppression. Strong bases (e.g. 30 % NaOH) should not be led unlim-

ited to the SP Module A. To provide a sufficient capacity for exchanging

by H

Ions, only a small fraction (e.g. 20 µL) is directed to the SP

Module A using a sample loop. The analyte anions are preconcentrated

subsequently on a preconcentration column and finally eluted to the

separation column in counter flow by the eluent.
Therefore, such an IC system corresponds to the Modular IC System

6 (MIC 6: Anion system with chemical suppression, preconcentration

and matrix elimination) enhanced by the 793 IC Sample Prep Module.
If the sample doesn’t require matrix elimination and preconcentration, it

can be treated directly by the SP Module A. This could be an option for

samples containing only low amounts of the cations which have to be

eliminated. For this purpose, a system as described in section 2.4

should by used.
The following pages describe the electronic connections of this system

in combination with the 766 IC Sample Processor on the base of full

control by «IC Net 2.1».

2.3.1

Electrical connection

The 793 IC Sample Prep Module is connected to an IC system consist-

ing of 732 IC Detector, 733 IC Separation Center (two injectors), 709 IC

Pump, 752 IC Pump Unit, 753 IC Suppressor Module and 762 IC Inter-

face as shown in Fig. 5.

753

793

752

762

733

709

732

6.2134.100

6.2134.080

6.2134.090

6.2128.130

6.2143.210

6.2115.070

6.2125.120

6.2125.090

6.2141.110

6.2143.200

6.2128.180

B (LOOP) A (PCC)

Fig. 5: Connection 793 IC Sample Prep Module -

Modular IC System for Neutralization