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GB/T 7702.18-2008 PDF in English

GB/T 7702.18-2008 (GB/T7702.18-2008, GBT 7702.18-2008, GBT7702.18-2008)
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GB/T 7702.18-2008: PDF in English (GBT 7702.18-2008)

GB/T 7702.18-2008
ICS 75.160.10
D 24
Replacing GB/T 7702.18-1997
Test Method for Granular Activated Carbon from
Coal - Determination of caramel adsorption
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of
Table of Contents
Foreword ... 3 
1  Scope ... 5 
2  Normative references ... 5 
3  Terms and definitions ... 5 
4  Principle ... 6 
5  Reagents and materials... 6 
6  Instruments and equipment ... 8 
7  Specimen preparation ... 9 
8  Determination steps ... 9 
9  Result calculation ... 10 
10 Precision ... 10 
11 Test Report ... 10 
GB/T 7702 "Test Method for Granular Activated Carbon from Coal" is divided into.
— Part 1. Determination of Moisture;
— Part 2. Determination of Particle Size;
— Part 3. Determination of Hardness;
— Part 4. Determination of Packing Density;
— Part5. Determination of Absorption of Water;
— Part 6. Determination of Methylene Blue Absorption;
— Part 7. Determination of Iodine Number;
— Part 8. Determination of Phenol Absorption;
— Part 9. Determination of Ignition Temperature;
— Part 10. Determination of Service Life against Benzene and Chloroethane
— Part 13. Determination of CCL4 Vapour Absorption;
— Part14. Determination of Sulphur Capacity;
— Part 15. Determination of Ash Content;
— Part 16. Determination of pH Value;
— Part 17. Determination of Floatation Ratio;
— Part 18. Determination of Caramel Absorption;
— Part 19. Determination of Carbon Tetrachloride (CCl4) Desorption;
— Part 20. Determination of Pore Volume and Specific Surface Area.
This Part is part 18 of GB/T 7702.
This Part replaces GB/T 7702.18-1997 Standard test method for granular activated
carbon from coal - Determination of caramel adsorption.
Compared with GB/T 7702.18-1997, the main changes of this Part are as follows.
a) Change the standard structural according to GB/T 1.1-2000 Directives for
standardization - Part 1. Rules for the structure and drafting of standards and GB/T
20001.4-2001 Rules for drafting standards - Part 4. Methods of chemical analysis;
b) Add Method A. Preparation and calibration of caramel stock solution;
c) Added Chapter 3 “Terms and definitions”.
This Part was proposed by and shall be under the jurisdiction of China North Industries
Group Corporation.
Drafting organization of this Part. Shanxi Xinhua Chemical Co., Ltd.
Main drafting staffs of this Part. Han Chongyun, Li Weibing, Zhao Jijun, Chi Guangxiu,
Yuan Yidong, Zhang Xu, and Li Ruomei.
This Part replaces the following historical editions.
— GB/T 7702.18-1987, GB/T 7702.18-1997.
Test Method for Granular Activated Carbon from Coal -
Determination of Caramel Adsorption
1 Scope
This Part specifies the content such as determination principle, determination steps and
result calculation for the determination of caramel adsorption of granular activated carbon
from coal.
This Part applies to the determination of caramel adsorption of granular activated carbon
from coal. It is also applicable to determination of caramel adsorption of other activated
2 Normative references
The following standards contain provisions which, through reference in this text, constitute
provisions of this Part of GB/T 7702. For dated reference, the subsequent amendments
(excluding correction) or revisions of these publications do not apply. However, the parties
who enter into agreement based on this standard are encouraged to investigate the
possibility of applying the most recent editions of the standards. For undated references,
the latest edition of the normative document referred to applies.
GB/T 639 Chemical Reagent - Sodium Carbonate Anhydrous (GB/T 639-2008, ISO
6353-2.1983, NEQ)
GB/T 658 Chemical Reagent - Ammonium Chloride (GB/T 658-2006, ISO
6353-2.1983, NEQ)
GB/T 687 Chemical Reagent - Glycerol (GB/T 687-1994, neq ISO 6353-3.19S7)
GB 1259 Working Chemical - Potassium Dichromate
GB/T 1914 Chemical Analytical Filter Paper
GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods
(GB/T 6682-2008, ISO 3696, 1987, MOD)
3 Terms and definitions
For the purpose of this Part of GB/T 7702, the following terms and definitions apply.
6.10 Electric stirrer (speed adjustable).
6.11 Analytical balance. sensitivity is 0.0001 g.
6.12 Electrothermal constant-temperature drying oven. 0°C~300°C.
6.13 Dryer. filled with anhydrous calcium oxide or allochroic silica gel.
6.14 Grinding machine.
6.15 Electric thermostat furnace.
6.16 Constant-temperature oil bath.
7 Specimen preparation
Take about 10 g of specimen by using quartering method. Grind it in grinding machine
until more than 90% of the specimen can pass through the 0.071 mm test sieve. The
sieve-remaining specimen is mixed with it uniformly. Place in electrothermal
constant-temperature drying oven at 150°C±5°C to dry for 2 h. Place in the dryer to cool
down for later use.
8 Determination steps
8.1 When using Method A caramel test solution to determine the caramel adsorption,
weigh 0.400 g of specimen, accurate to 0.0001 g (when using Method B caramel test
solution to determine caramel adsorption, weigh 0.350 g of specimen, accurate to 0.0001
g). Place in a 100 mL conical flask.
8.2 Measure 25 mL of caramel test solution with pipette. Put it in a conical flask containing
specimen. Slowly shake the conical flask to wet the specimen completely.
8.3 Place in boiling water bath. Heat for 30 min. Shake it once every 5 min.
8.4 Take out. Immediately use filter paper to filter. Discard 5 mL of primary filtrate. All test
solution shall be filtered. Cool down to room temperature.
8.5 Use water as the reference solution, measure the absorption with a
spectrophotometer and a 10 mm cuvette at wavelength of 426 nm.
8.6 Take 25 mL of blank test solution. Conduct blank test according to the requirements of
8.4 ~ 8.5. Obtain the absorption of the blank test solution.
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.