Operation - Agilent Technologies VGA 77 User Manual

Operation

Before starting the analytical program you must measure the
analytical signal caused by the presence of analyte in:
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To do this:
1
2
3
4
You can now calibrate the system and measure your samples.
Samples can be presented to the system manually by dipping the
sample capillary tube into a flask, test tube or vial. You can use the
VGA 77 with non-Agilent instruments and autosamplers.
The general procedure for using automatic samplers is given in the
next section.
Agilent Vapor Generation Accessory VGA 77 and VGA 77P User's Guide
The acid and reductant solutions being pumped through the
system
The analytical blank solution
Place all three uptake tubes in a single container of distilled
water. Wait for about 40 seconds to allow the system to stabilize.
Perform an instrument zero.
Leave the sample uptake tube in distilled water and place the
acid and reductant uptake tubes in their respective reagent
solutions. Wait for about 40 seconds and measure the signal. Any
signal registered is attributable to analyte in the solutions being
pumped through the system.
Place the sample uptake tube in the analytical blank solution.
Wait for about 40 seconds and measure the signal. This
measurement is the total signal attributable to analyte in all
solutions used (acid, reductant, analytical blank).
The measurements obtained in the previous two steps allow you
to decide whether the blank signal is acceptable or not before
using the blank solution to calibrate the instrument at analytical
zero.
Operation
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