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ASTM International, 01/01/2014
Publisher: ASTM
File Format: PDF
$38.00$76.00
Published:01/01/2014
Pages:11
File Size:1 file , 330 KB
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1.1 This test method covers the precise on-line determination of pH in water samples of conductivity lower than 100 μS/cm (see Table 1 and Table 2) over the pH range of 3 to 11 (see Fig. 1), under field operating conditions. pH measurements of water of low conductivity are problematic for conventional pH electrodes, methods, and related measurement apparatus.
Sample Concentration, mg/L
Sample Conductivity, μS/cm
Sample pH
Δ pH Error from Additional 1 mg/L NaOH Contaminate
0.001
0.055
7.05
Δ 2.35
0.010
0.082
7.45
Δ 1.95
0.100
0.625
8.40
Δ 1.03
1.0
6.229
9.40
Δ 0.30
8.0
49.830
10.30
Δ 0.05
Δ pH Error from Additional 1 mg/L HCl Contaminate
0.060
6.94
Δ2.38
0.134
6.51
1.166
5.56
11.645
4.56
93.163
3.66
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