GE Sievers 500 RL, Operation And Maintenance Manual, Page: 37 / 186

GE Analytical Instruments ©2010 37 of 226 DLM 74001-04 Rev. A
Chapter 1. Introduction
The Sievers
*
500 RL On-Line TOC Analyzer from GE Analytical Instruments is a high-sensitivity Analyzer used to
measure the concentration of total organic carbon (TOC), total inorganic carbon (TIC), and total carbon
(TC = TOC + TIC) in water samples (for patent information, see the section called “Trademarks and Patents” on
page 14).
The Analyzer is based on the oxidation of organic compounds to form carbon dioxide (CO
2
) using UV radiation.
Carbon dioxide is measured using a sensitive, selective membrane-based conductometric detection technique
as described by Godec et al. (R. Godec et al., “Method and Apparatus for the Determination of Dissolved Carbon
in Water,” U.S. Patent No. 5,132,094). For each TOC measurement, the concentration of inorganic carbon species
(CO
2
, HCO
3
-
, and CO
3
-2
) is determined and, after oxidation of the organic compounds, the total carbon (TC)
content of the sample is measured. The concentration of the organic compounds is then calculated from the
difference between the concentrations of TC and total inorganic carbon (TIC), generally referred to simply as
inorganic carbon (IC).
(TOC = TC - IC)
*
Trademark of General Electric Company; may be registered in one or more countries.