Page 10 - 3_Chemical industry

SCA-130-304

Initially, a blank value and a control standard
Compound Dilution Conc. (10 mg/L) were measured, and the NaCl
(Concen- solution was subsequently injected.
tration) The control standards were tested after 110
Brine 1 : 2 diluted with ca. and 220 injections of the brine solution,
solution water (25ml/50ml) 15%ig
(30%) add. 1-2 drops respectively.
Sulfuric acid until
pH<7

For the analysis a TOC-L CPH equipped with a
kit for high salt loads was used. The system
is calibrated using the automated dilution
function in the range of 0.5 mg/L to 10 mg/L.

Maintenance of the combustion tube and the
catalyst was not necessary after the
measurements were completed. Only the TC-
slider needed to be cleaned. The figure
above shows the excellent reproducibility’s
and the stability of the measurement.

Fig. Multi-point calibration
with dilution function

■ Result
The duplicate determination of the TOC
analysis yielded the following results:

NPOC RSD
Sample
[mg/l] [%]
Brine solution (30%) 3,6 1,8
Brine solution (30%) 3,6 1,8
■ Recommended Analyzer / Configuration
■ Stability test TOC-L CPH
In this test, the long-term stability of the High-Salt-Kit
combustion system was tested. The system B-Type-Scrubber
was calibrated to 10 mg/L with an injection
volume of 50 µL.
A 28% NaCl solution was prepared and
spiked with a KHP solution to obtain a 5 mg/L
TOC solution and a 15% sulfuric acid solution
was added.