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ASTM International , 01/01/2014
Publisher: ASTM
File Format: PDF
$38.00$76.00
1.1This 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
1.2This test method includes the procedures and equipment required for the continuous pH measurement of low conductivity water sample streams including the requirements for the control of sample stream pressure, flow rate, and temperature. For off-line pH measurements in low conductivity samples, refer to Test Method D5464.
1.3The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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