Page 12 - 1_Environmental analysis

SCA-130-105

The suspension is homogenized for several ■ Example of suspension determination
minutes at a speed of 17,000 – 18,000 rpm
using a dispersion unit. It is critically
important to select a suitable precision tool.
After homogenization, the suspension is
transferred directly to autosampler vials.
Critical for subsequent measurement is the
use of a magnetic stirrer in the autosampler
to ensure that the suspension remains
homogeneous during sampling. After all, the
small particles should not sediment, but
remain uniformly distributed throughout the
solution. The suspensions can now be
repeatedly injected and analyzed. NPOC-Method (Acidification is done by
creation of the suspension)
Sparge-time: 5 Minutes
Injection volume: 90µl
Multi-Injection is deactivated

■ Statistic

Peak-No Areas Result of Result of
suspension Sample TOC
TOC in mg/l in %
1 183,7 24,71 2,47
2 180,9 24,23 2,42
3 189,0 25,61 2,56
4 183,8 24,72 2,47
5 179,9 24,06 2,41
6 179,9 24,06 2,41
7 179,9 23,89 2,39
8 186,9 25,25 2,53
9 181,6 24,35 2,37
10 177,6 23,67 2,37
MW 182,2 24,5 2,45
This method enables not only automated RSD in% 1,88 2,52 2,49
solid sample analysis using an autosampler,
but also parallel measurement of solid and
liquid samples in the same sample table and ■Recommended analyzer / Configuration
the same sample tray. In addition to speed, TOC-L CPN
this method is also impressive in terms of ASI-L (40ml) with stirrer option and
robustness. The possibility of multiple external Sparge-Kit.
injections enables differentiation of small
variations due to weighing and measuring.