Page 16 - 6_TOC in daily practice

SCA-130-608

■ TOC-Determination of a high ■ Function “Auto Re-measurement“
concentrated Glycol solution The previous measurements are done with a
TOC-determination on airports is one of the fixed dilution factor of 40. But which
applications where the TOC values can parameter should be set if the samples with
fluctuate significantly depending on the use of high concentration are exceptional cases
the de-icing agent. The de-icing agent that is only?
most frequently used is a mixture of water, In this case, the TOC-4200 provides the
glycol and additives. function “Auto RE-measurement”.
Due to this, the test is repeated with a glycol
solution in different concentration.

1. Glycol Solution
Parameter: TC
Concentration: 45,250mg/L
Dil. factor: 40
Injection vol.: 20µl
Port: Offline-Port
#Inj. Area Concentration Recovery
1 1734 44,951 mg/L 99,3%
2 1770 45,885 mg/L 101,4%
3 1720 44,588 mg/L 98,5%
MW 1741 45,133 mg/L 99,7% This function allows setting of the parameters
SD 25,8 669 mg/L for the normal measurement (lower
RSD 1,48% measurement range, un-diluted or low dilution
factor).
2. Glycol Solution If the measurement value exceeds the
Parameter: TC calibrated range, the injection volume and
Concentration: 55,340mg/L dilution factor are automatically updated and
Dil. factor: 40 measurement is performed again.
Injection vol.: 20µl
Port: Offline-Port ■ Conclusion
The results show that the TOC-4200 can
#Inj. Area Concentration Recovery handle samples with very high concentration
1 2087 54,102 mg/L 97,8% (up to 55,000 mg/L Carbon) without any
2 2087 54,102 mg/L 97,8% problems
3 2027 52,547 mg/L 95,0%
MW 2067 45,133 mg/L 96,8%
SD 34,6 898 mg/L ■ Recommended Analyzer / Configuration
RSD 1,68% TOC-4200