Introduction
Agilent Vapor Generation Accessory VGA 77 and VGA 77P User’s Guide 13
2. Introduction
About the VGA 77 and VGA 77P 13
About this Manual 14
Specifications 14
About the VGA 77 and VGA 77P
The Vapor Generation Accessory 77 (VGA 77) is a vapor generation
system for Atomic Absorption (AA) and the VGA 77P is for
Inductively Coupled Plasma Optical Emission Spectrometer
(ICP-OES) applications. Unless otherwise specified, both the VGA 77
and VGA 77P will be refered to as VGA 77 throughout the rest of this
User’s Guide.
Vapor generation is an extremely sensitive procedure used for
determining the level of mercury, arsenic, selenium and a range of
other hydride-forming elements in samples. The sample capillary is
placed in the solution to be measured and the VGA 77 pumps the
sample through a reaction coil where it is automatically acidified and
mixed with a suitable reductant. The resulting vapor is transferred to
an atomization cell with AAS or to the plasma for ICP-OES for
determination by the spectrometer.
The VGA 77 is supplied in a modular form, with a pump unit and
separate reagent module. Since ICP and AA applications use
different gas/liquid separators, using separate plumbing assemblies
for different reagents enables:
Flexibility—the VGA 77 can be used with both AAs and ICPs
Quick and simple change of applications, for example from AA to
ICP or between different types of analyses
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