Page 49 - Application Handbook - TOC

SCA-130-402

■ TN b-Determination ■ Conclusion
The TOC determination using catalytic The TOC suspension method offers a good
combustion oxidation allows the simultaneous alternative for the fast, straightforward and
measurement of the total bound nitrogen accurate analysis of the organic content in
(TN b), since, in addition to the carbon dioxide liquid manure samples. The possibility for co-
from organic substances, NO is formed from determination of the nitrogen content also
nitrogen-containing compounds. For the enables users to acquire additional useful
conversion of NO to NO 2, the measuring gas information for the evaluation of liquid manure
ozone was fed to the chemiluminescence samples.
detector connected in-series. The photons
emitted during this reaction are detected and
are used in the calculation of the TN b value.
Nitrogen compounds also play an important
role when it comes to liquid manure.
.

100
90
Signal[mV] 60 30

0
-10
0 5 10 15 20
Zeit[min]
Fig.4: Peak graphs of TN-determination
■ Recommended Analyzer / Configuration
Simultaneously with the organic content, the
TN b was determined (duplicate determination TOC-L CPN with normal sensitive Catalyst
from two different approaches with 5 separate for TN b-Determination: TNM-L Module
injections each) yielding the following results: ASI-L (40ml) with stirrer option and external
Sparge-Kit.

Liquid manure TN b RSD
(dried and [mass.‐%] [%]
powdered)
Sample 1 1,84 1,5
Sample 1 1,80 0,9
Sample 2 1,76 2,2
Sample 2 1,68 1,4