22
pH
5.0
4.7
5.1
4.1
5.2
3.6
5.3
3.3
5.4
3.0
5.5
2.8
5.6
2.6
5.7
2.5
5.8
2.4
5.9
2.4
6.0
2.4
6.1
2.4
6.2
2.5
6.3
2.4
6.4
2.3
6.5
2.2
6.6
2.1
6.7
2.6
6.8
3.1
6.9
3.8
7.0
4.6
Stage 3
pH and conductivity requirements
(For atmosphere and temperature equilibrated samples only)
Conductivity
µS/cm
USP MEASUREMENT