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Method of Determining the Zero Point During the Measurement Of Dissolved Organic Carbon by Means of the UV Thin-Film Method

IP.com Disclosure Number: IPCOM000100806D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 1 page(s) / 29K

Publishing Venue

IBM

Related People

Weber, W: AUTHOR

Abstract

The UV thin-film method (German Patent 2435564) decomposes dissolved organic carbon (DOC) to carbon dioxide (CO2) by UV irradiation. For determining the zero point, the decomposition is temporarily interrupted by adding potassium iodide (KJ) to the sample to be measured.

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Method of Determining the Zero Point During the Measurement Of Dissolved Organic Carbon by Means of the UV Thin-Film Method

       The UV thin-film method (German Patent 2435564)
decomposes dissolved organic carbon (DOC) to carbon dioxide (CO2) by
UV irradiation.  For determining the zero point, the decomposition is
temporarily interrupted by adding potassium iodide (KJ) to the sample
to be measured.

      Sample 1 to be measured is passed - optionally continuously -
by pump 2 through reactor 3 in which the UV irradiation takes place.
The amount of decomposition product (CO2) is quantitatively
determined in IR detector 4, while the treated sample is disposed of.
For determining the zero point of the measured CO2 temporarily
(intermittently in the case of continuous operation), an acidic KJ
solution 5 is added by pump 6 to sample 1 before it enters reactor 3.
The KJ absorbs the UV radiation completely, forming iodonium and
iodate, so that the decomposition of DOC is suppressed.  At this
stage of measurement, the IR signal is taken as the zero point which
is lower than the one previously used and more constant.