Page 10 - 1_Environmental analysis

SCA-130-104

■ Kit for high-salt samples Compound Melting point
The TOC-L series features a kit for high-salt
samples, which significantly increases NaCl 801°C
instrument availability.
Using this kit in a seawater application, it was KCl 773°C
possible to carry out 2500 injections without Na 2SO 4 888°C
maintenance (injection volume of 40 µL).
The kit consists of a combustion tube with a MgCl 2 708°C
special geometry and a unique catalyst CaCl 2 782°C
mixture.
K 2SO 4 1.069°C
Tab. Melting point of different salts

■ Simultaneous TN determination using
the TNM-L
Based on the similar oxidation process, the
TNb determination can be carried out
simultaneously with the TOC measurement.
For this application, the TNM-L option is
installed on the main TOC-L system.

In this application, sample acidification is
carried out with sulfuric acid which is used to
modify the sample matrix. While NaCl has a
melting point of 801 °C, the melting point of
NaSO 4 is higher (888 °C). The potassium
salts of sulfuric acid also have a significantly
higher melting point than those of
hydrochloric acid. This has a positive effect
on the lifetime of the combustion tube.

Figure: Simultaneous TOC/TN-Determination

■ Recommended analyzer / Configuration
TOC-L CPN
ASI-L (40ml), External Sparge-Kit.
Kit for high-salt samples
TNM-L