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Test methods for quality of coal water mixture -- Part 14: Determination for pH value of coal water mixture
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GB/T 18856.14-2002: Test methods for quality of coal water mixture -- Part 14: Determination for pH value of coal water mixture
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT18856.14-2002
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 75.160
D 21
Test Methods for Quality of Coal Water Mixture – Part 14.
Determination for pH Value of Coal Water Mixture
Issued on: OCTOBER 18, 2002
Implemented on: APRIL 1, 2003
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People’s Republic of China
Replaced
Table of Contents
Foreword... 3
1 Scope... 4
2 Method Overview... 4
3 Reagents... 4
4 Apparatuses... 5
5 Specimen... 5
6 Test Procedures... 5
7 Result Expression... 6
8 Precision of the Method... 6
Test Methods for Quality of Coal Water Mixture – Part 14.
Determination for pH Value of Coal Water Mixture
1 Scope
This Part of GB/T 18856 specifies the method overview, apparatuses, test procedures, result
expression, and precision for determining the pH value of coal water mixture.
This Part is applicable to various types of coal water mixture.
2 Method Overview
The glass electrode and calomel electrode of the pH meter are immersed in the coal water
mixture, creating a potential difference between the two electrodes, thereby providing the pH
value of the coal water mixture.
3 Reagents
3.1 Water
Distilled water or water of equivalent purity shall be freshly boiled and cooled to room
temperature before use.
3.2 Buffer solutions with standard pH values
3.2.1 Neutral phosphate solution. pH around 7.
Weigh 3.40 g of potassium dihydrogen phosphate (GB 6853) and 3.55 g of disodium hydrogen
phosphate (GB 6854); dissolve in carbon dioxide-free water; and dilute to 1000 mL. Potassium
dihydrogen phosphate and disodium hydrogen phosphate shall be pre-dried at (120±10)℃ for
2 h.
3.2.2 Potassium hydrogen phthalate standard solution. pH around 4.
Weigh 10.21 g of potassium hydrogen phthalate (GB 6857) dried at 110℃ for 1 h; dissolve in
carbon dioxide-free water; and dilute to 1000 mL.
3.2.3 Borate standard solution. pH 9 ~ 9.5.
Weigh 3.81 g of sodium tetraborate (GB 6856); dissolve in carbon dioxide-free water and dilute
to 1000 mL. Prevent carbon dioxide from entering during storage.
The above three standard solutions must be prepared using pH standard substances. The pH
values of each standard solution at different temperatures are shown in Table 1.
3.2.4 Standard pH value buffer solutions can also be prepared according to the instructions in
the pH standard substance certificate.
4 Apparatuses
4.1 pH measuring device, capable of measuring to 0.1 unit. It shall be calibrated by standard
pH value buffer solutions at the specified test temperature.
4.2 Wide-mouth plastic bottle or 50 mL beaker.
4.3 Mercury thermometer. 0℃~50℃, with graduation of 0.2℃.
5 Specimen
Water coal mixture specimen used for pH determination shall be sealed and placed at room
temperature for at least 2 h before test.
6 Test Procedures
6.1 pH meter calibration
Select two standard pH value buffer solutions (close to or covering the pH of the water coal
mixture being tested). Immerse the measuring part of the pH meter into one of the standard
solutions and adjust the indicating part until the displayed pH value matches that of the standard
buffer solution. Then immerse the measuring part into the other standard buffer solution. If the
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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