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GB/T 18856.7-2008: Test methods for coal water mixture -- Part 7: Determination for pH value
Status: Valid GB/T 18856.7: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 18856.7-2008 | English | 149 |
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Test methods for coal water mixture -- Part 7: Determination for pH value
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GB/T 18856.7-2008
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| GB/T 18856.7-2002 | English | 239 |
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Test methods for quality of coal water mixture -- Part 7: Proximate analysis of coal water mixture
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GB/T 18856.7-2002
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Basic data | Standard ID | GB/T 18856.7-2008 (GB/T18856.7-2008) | | Description (Translated English) | Test methods for coal water mixture -- Part 7: Determination for pH value | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | D21 | | Classification of International Standard | 75.160 | | Word Count Estimation | 5,562 | | Date of Issue | 2008-07-29 | | Date of Implementation | 2009-04-01 | | Older Standard (superseded by this standard) | GB/T 18856.14-2002 | | Quoted Standard | GB/T 6682 | | Regulation (derived from) | National Standard Approval Announcement 2008 No.12 (Total No.125) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the method for measuring the pH of coal-water slurry feed, reagents, equipment, measuring step, outcome statements and precision and so on. This section applies to a variety of CWS. | GB/T 18856.7-2008: Test methods for coal water mixture -- Part 7: Determination for pH value---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Test methods for coal water mixture Part 7. Determination for pH value
ICS 75.160
D21
National Standards of People's Republic of China
Replacing GB/T 18856.14-2002
CWS Test Method
Posted 2008-07-29
2009-04-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This revision of GB/T 18856 "CWS Test Method" is divided into seven sections.
--- Part 1. Sampling;
--- Part 2. Determination of the concentration;
--- Part 3. screening tests;
--- Part 4. Determination of apparent viscosity;
--- Part 5. Determination of stability;
--- Part 6. Determination of density;
Part --- Article 7. pH value measurement.
This standard replaces GB/T 18856-2002 "Test methods for quality of coal water."
This standard compared with GB/T 18856-2002, the main differences are as follows.
--- Deleted - Part 6. Determination of calorific value coal water slurry;
--- Deleted Part 7. CWS industry analysis;
--- Deleted Part 8. Determination of total sulfur in coal water slurry;
--- Deleted Part 10. Determination of the ash fusion CWS;
--- Deleted Part 11. Determination of Hydrocarbon CWS;
--- Deleted Part 12. CWS nitrogen determination method;
--- Deleted Part 13. CWS ash component measurement method.
Delete the contents were integrated into the standard measurement method related to coal and coal ash.
This section GB/T Part of 718,856. This revision retains the entire contents of the GB/T version 18856.14-2002, only for
Revised format.
This Part replaces GB/T 18856.14-2002 "Test methods for quality of coal water - Part 14. CWS pH value measurement method."
This part is proposed by the China Coal Industry Association.
This part of the National Standardization Technical Committee centralized coal.
This section is drafted. CCRI coal analysis laboratory.
The main drafters of this section. Fu Cong, Shi Yuying, Min.
This part of the standard replaces the previous editions are.
--- GB/T 18856.14-2002.
CWS Test Method
1 Scope
This section GB/T 18856 specifies the method feeds, reagents, instruments and equipment CWS pH value measurement, the measuring step, results are expressed
And precision and so on.
This section applies to a variety of CWS.
2 Normative references
The following documents contain provisions which, through reference GB/T 18856 in this section constitute provisions of this section. For dated reference documents
Member, all subsequent amendments (excluding corrections) or revisions do not apply to this section, however, encouraged to reach under this section
Research into whether the parties to the agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this
section.
Laboratory use specifications and test methods GB/T 6682 Analysis
3 Method summary
The glass electrode pH meter and calomel electrode immersed in the CWS, the potential difference between two electrodes, thereby giving the CWS
pH.
4 Reagents
4.1 Water
The water used in this section to comply with two water GB/T 6682 may require. Before use freshly boiled and cooled to room temperature.
Weigh 3.40g potassium dihydrogen phosphate (GB/T 6853) and 3.55g disodium hydrogen phosphate (GB/T 6854), dissolved in water and diluted to
1000mL. Potassium dihydrogen phosphate and disodium hydrogen phosphate in advance (120 ± 10) ℃ drying 2h.
Weigh 110 ℃ drying 1h at 10.21g of potassium hydrogen phthalate (GB/T 6857), dissolved in water and diluted to 1000mL.
Weigh 3.81g sodium tetraborate (GB/T 6856), dissolved in water and diluted to 1000mL.
It may be formulated in accordance with the instructions pH standard material certificates.
When the pH value of each standard solutions at different temperatures as shown in Table 1.
Temperature/℃ neutral phosphate standard solution of potassium hydrogen phthalate standard solution borate standard solution
0 6.98 4.00 9.46
5 6.95 4.00 9.40
10 6.92 4.00 9.33
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