Maintenance
46
Waltron User Manual 101-045-E.1
9031CX Sodium Analyzer
4.5.5
PH EFFECTS
Measuring the pH of the effluent from the flowcell indicates adequate buffering. The minimum pH
depends on the minimum sodium concentration, but the pH value is calculated as:
pH must be greater than pNa + 3, so ideally at:
100ppb Na+, the pH must be greater than 8.4
10ppb Na+, the pH must be greater than 9.4
1ppb Na+, the pH must be greater than 10.4
0.5ppb Na+, the pH must be greater than 11.4
ATTENTION
If the buffer is allowed to become completely exhausted, the reading may be
very erratic due to the lack of ionic strength adjustment of the high purity
sample.
