Page 33 - Application Handbook - TOC

SCA-130-303

The system is calibrated using the automatic ■Result
dilution function in the range of 0.5 mg/L to 10
mg/L. The duplicate determination of sulfuric acid
yielded the following results:

NPOC RSD
Sample
[mg/l] [%]
Sulfuric acid
(98%) <10 (4,6) -
Sulfuric acid <10 (5,4) -
(98%)

Fig. Multi-point calibration The sulfuric acid fulfilled the required purity
with dilution function criteria of TOC < 10 mg/L.

■ Kit for high-salt samples The use of suitable gas washers (scrubbers)
For the determination, a TOC-L CPH equipped enables reproducible TOC measurements in
with a kit for high salt loads was used. The kit concentrated sulfuric acid.
consists of a special catalyst tube, a special
mixture of various catalyst beads and a
ceramics grid, which replaces the platinum
net.

Sample acidification when using the high-salt
kit, is carried out with sulfuric acid. Sulfuric
acid is used to modify the sample matrix.
While NaCl has a melting point of 801 °C, the
melting point of NaSO 4 is higher (881 °C).
This has a positive effect on the lifetime of the
combustion tube.

For this reason, sulfuric acid is measured
directly using the high-salt kit. ■ Recommended analyzer / Configuration
TOC-L CPH
OCT-L
High-Salt-Kit
B-Type-Scrubber with diluted hydrochloric
acid with wire net.
Mist-Scrubber