Page 20 - 1_Environmental analysis

SCA-130-109

■ Long-term test with 600 injections Here in comparison the peak graphic of
A long-term test should show that an injection 1-20
application, such as the analysis of soil 20
extracts from a 0.5 M potassium sulfate
14
solution can be carried out problem-free using Signal[mV]
a kit for high salt load samples. For this test, a 7
0.5 M K2SO4 solution (corresponding to 87 g/L) 0 -2
20
was injected 600 times onto the kit for high-salt 0 10 Zeit[min] 30 40
samples. and the peak graphic of injection 581-600
20
■ Method parameter
14
NPOC preparation: automated Signal[mV]
Acidification: 2% 7
Sparging: 6 Minutes 0 -2
20
Injection volume: 50 µl 0 10 Zeit[min] 30 40
Calibration: 0,5 mg/l to 10 mg/l.

■ Results ■ Conclusion
Area NPOC- As one can see, the TOC-L in combination
concentration
[mg/l] with the kit for high salt load samples is highly
Mean value 17,01 6,66 suitable for TOC determination of salt-
Standard containing samples, such as soil extracts from
0,392 0,153 a 0.5 M potassium sulfate solution.
deviation
Standard ■ Recommended Analyser / Configuration
2,3 2,3
deviation in % TOC-LCXX
Kit for high salt loads

Even after 600 injections, the peak shapes
remain exactly the same as at the start of the
injection series.

Sequence (area and concentration) of the 600 injections