Day
PS20
PS80
Conc (ppm)
% Diff from Day 0
Conc (ppm)
% Diff from Day 0
0
20.0
0.0
20.0
0.0
1
20.3
1.5
20.5
2.5
3
20.7
3.5
20.4
2.0
7
19.7
-1.5
19.4
-3.0
14
20.1
0.5
19.3
-3.5
28
19.9
-0.5
19.7
-1.5
Table 5:
Solution stability for PS20 and PS80 standards.
