Ionics Instruments 2004 Page 1-1 DLM 30007-08 Rev. A
1 INTRODUCTION
The Sievers 800 Series Total Organic Carbon (TOC) Analyzer from Ionics
Instruments (U.S. Patent No. 5,132,094) 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 all water samples. The 800
designation is for 120V systems, 810 is for 100 V systems and 820 designation
is for 230V systems (generically referred to as a Sievers 800 TOC Analyzer).
The analyzer is based on the oxidation of organic compounds to form carbon
dioxide using UV radiation and a chemical oxidizing agent (ammonium
persulfate). Carbon dioxide is measured using a sensitive and selective
membrane-based conductometric detection technique as described by Carlson
(R. M. Carlson, "Method and Apparatus for the Determination of Volatile
Electrolytes", U.S. Patent No. 4,209,299, licensed by Ionics Instruments) 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 content of the sample is measured. The concentration of the
organic compounds is then calculated from the difference between total carbon
and total inorganic carbon concentrations
(TOC=TC–TIC).
The analyzer can be used to monitor water samples ranging from high-purity
water containing < 0.5 parts per billion carbon to water samples containing up to
50 parts per million TOC. The analyzer is easy to operate, with extremely low
maintenance, and no special training or chemical knowledge required for
preparing reagents. The analyzer is calibrated at the factory, with the calibration
stable for approximately one year. Recalibration and validation can be easily
performed at the user’s site.
NOTE
Throughout this manual, the term Sievers 800 TOC Analyzer refers to all models
(800/810/820) of the analyzer.
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