Page 9 - 4_TOC special applications

SCA-130-403

Displacement reaction: (the strong acid dioxide in bottled or canned beer. In this step,
displaces the weak acid from its salt) 5 mL of a 32% solution of NaOH was directly
added to the freshly opened bottle or can for
preservation.
- +
HCO + H → H O + CO ■ Comparison of the methods
3 2 2
The following graph shows the good
2- + agreement between the TOC method (blue
CO + 2 H → H O + CO bars) and the Corning method (green bars).
3 2 2

6,00
To calculate the results, the IC function of the 5,00
TOC system is calibrated using a sodium
hydrogen carbonate standard in the range of 4,00
100 – 1000 mg/L. The dilution of the 3,00
individual calibration points is performed 2,00
automatically via the dilution function of the 1,00
instrument. 0,00

■ Advantages of this method
 can be automated to a high degree
 fast
 good reproducibility and high accuracy
(precision)
 multiple determinations from one sample
is possible
 effortless calibration
 simple operation
 highly specific

Using the modern TOC-L software,
evaluation can be carried out automatically or
can be recalculated manually. Another
function enables further processing of the
measurement results. This way the carbon
dioxide content can be directly presented in
the desired dimension. Due to the possibility
for multiple injections, the evaluation contains
all the important statistical quantities
■ Recommended Analyzer / Configuration
Another sample preparation variant is to be TOC‐L CPH
carried out during the determination of carbon ASI‐L (40ml)