Table of Contents
Advertisement
Dionex ED50A Electrochemical Detector
detection provided by the Dionex ED50A provides superior sensitivity and
selectivity.
Electrochemical detection is not a substitute for UV-visible absorbance detection,
but is an important complement. A liquid chromatograph equipped with both a
Thermo Scientific Dionex absorbance detector and an electrochemical detector is
a versatile and powerful analytical instrument.
1.2
Detection Modes
The Dionex ED50A provides two major forms of electrochemical detection: DC
amperometry and integrated amperometry. Pulsed amperometry is a form of
integrated amperometry.
•
DC Amperometric detection is based on the measurement of current resulting
from oxidation or reduction (electrolysis) of analyte molecules at the surface
of an electrode.
•
Integrated and pulsed amperometric detection are similar to DC
Amperometry in that molecules are oxidized or reduced at the surface of an
electrode. However, current is measured by integration during a portion of a
repeating potential vs. time waveform.
In addition, the Voltammetry mode is used to determine potentials used in DC and
integrated amperometry.
NOTE Dionex ED50A detectors shipped in June 2013 or later
1.3
Control Modes
The Dionex ED50A can be controlled locally from the front panel or remotely
(via the Thermo Scientific Dionex DX-LAN
running Thermo Scientific Dionex Chromeleon
System and the Microsoft
1-2
are not recommended for conductivity detection. If your
detector was shipped before June 2013, refer to ED50A
Electrochemical Detector Operator's Manual (Document
No. 031772) for information about the Conductivity
mode. The manual is provided on the Thermo Scientific
Reference Library DVD (P/N 053891).
®
Windows
™
interface) from a host computer
®
6.8 Chromatography Data
®
XP Service Pack 3 operating system.
Doc. 065551-01 6/13
Advertisement
Table of Contents
