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GB/T 7701.2-2008 (GB/T7701.2-2008)

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GB/T 7701.2-2008: PDF in English (GBT 7701.2-2008)
GB/T 7701.2-2008
GB
ICS 75.160.10
D 24
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Replacing GB/T 7701.4-1997
Granular activated carbon from coal — Granular
activated carbon from coal for water treatment
ISSUED ON. NOVEMBER 20, 2008
IMPLEMENTED ON. MAY 01, 2009
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
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Requirements ... 6
4 Inspection rules ... 6
5 Inspection methods ... 9
6 Mark, package, transportation, storage ... 10
Annex A (Normative) Measurement of humic acid absorption ... 11
Annex B (Normative) Measurement of tannin acid absorption ... 15
Annex C (Normative) Measurement of water soluble substance ... 19
Foreword
GB/T 7701 Granular activated carbon from coal is divided into.
— Part 1. Granular activated carbon from coal for gas phase;
— Part 2. Granular activated carbon from coal for water treatment;
— Part 3. Granular activated carbon from coal for carrier.
This part is the Part 2 of GB/T 7701. Annex C modifies and adopts ASTM D 5029-1998
Standard test method for water soluble content in activated carbon (re-confirmed in 2004). The
main changes are as follows.
— Delete safety term in the Scope;
— Delete sections Quoted references, Terminology, Test method introduction,
Meaning and use, and Keywords;
— Delete the examples in result calculation;
— Delete the repeatability requirement in section Precision and deviation.
This part shall replace GB/T 7701.4-1997 Granular activated carbon from coal for water
treatment. The main changes are as follows.
— Delete quality classification;
— Formulate indicators for water soluble substance;
— Adsorption of methylene blue in ex-factory inspection items is changed from
“inspection item” to “item to be agreed by supplier and purchaser”;
— Iodine value is changed to ≥ 800 mg/g;
— Delete indicator of ash content;
— it no longer stipulates specific technical indicators for pore volume and specific
surface area;
— Add measurement of humic acid adsorption in Annex A;
— Add measurement of tannin acid adsorption in Annex B;
— Add measurement of water soluble substance in Annex C.
Annexes A, B and C are normative.
This part was proposed by and shall be administrated by China Weapon Industry Group
Corporation.
Drafting organization of this part. Shanxi Xinhua Chemical Co., Ltd.
The main drafters of this part. Zhang Xu, Pang Huisheng, Li Huaizhu, Li Weibing, and Wu
Yan.
The previous standards replaced by this part are as follows.
- GB/T 7701.4-1987;
- GB/T 7701.4-1997.
Granular activated carbon from coal
Granular activated carbon from coal for water treatment
1 Scope
This part specifies the requirements, inspection rules, test methods, mark, package,
transportation, and storage etc. for granular activated carbon from coal for water
treatment.
This part is applicable to dechlorination, oil removal and purification for industrial water;
further purification treatment for drinking water and sewage; and granular activated
carbon from coal for water treatment when water source are outbreak-polluted.
2 Normative references
The articles contained in the following documents have become this part of GB/T 7701
when they are quoted herein. For the dated documents so quoted, all the modifications
(excluding corrigendum) or revisions made thereafter shall not be applicable to this
Standard. For the undated documents so quoted, the latest editions shall be applicable to
this Standard.
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)
GB/T 7701.1-2008 Granular activated carbon from coal - Granular activated carbon
from coal for gas adsorption
GB/T 7702.1 Determination of moisture in granular activated carbon from coal
GB/T 7702.2 Standard test method for particle size distribution of granular activated
carbon from coal
GB/T 7702.3 Test method for granular activated carbon from coal - Determination of
hardness
GB/T 7702.4 Standard test method for packing density of granular activated carbon
from coal
GB/T 7702.6 Test method for granular activated carbon from coal—Determination of
methylene blue adsoption
GB/T 7702.7 Test method for granular activated carbon from coal - Determination of
iodine number
GB/T 7702.8 Test method for granular activated carbon from coal—Determination of
phenol adsorption
GB/T 7702.16 Standard test method for granular activated carbon from
coal-Determination of pH value
GB/T 7702.17 Standard test method for granular activated carbon from
coal-Determination of Floating ratio
GB/T 7702.20 Test method for granular activated carbon from coal - Determination of
pore volume and specific surface area
3 Requirements
3.1 Appearance
It shall be the carbon material in dark black, and in granular.
3.2 Impurities
Activated carbon must not contain poisonous and harmful substances which can affect
human health.
3.3 Technical indicators
The technical indicators of granular activated carbon from coal for water treatment shall
comply with the requirements in Table 1.
3.4 Pore volume and specific surface area
When necessary, the supplier shall provide test report and indicate the test method.
3.5 Humic acid adsorption and tannin adsorption
When necessary, the supplier shall provide test report.
4 Inspection rules
4.1 Inspection classification
Product inspection is divided into type testing and ex-factory inspection.
4.2 Type inspection
4.2.1 Inspection items
Inspection items are shown in Table 2.
4.2.2 Lot grouping
It shall accord with rules in 4.2.2 of GB/T 7701.1-2008.
Table 1 Technical indicators of granular activated carbon from coal for water
treatment
Take about 200 mL of activated carbon sample. Place in electrothermal constant
temperature drying box of 150°C±5°C for 2 hours. Then place in the dryer. Cool to room
temperature for standby use.
B.5.2 Drawing standard curve
Take 50 mL of tannin acid solution from 500 mg/L. Transfer to 500 mL volumetric flask. Fill
water to scale and mix well. At this moment, the solution concentration of tannin acid
solution is 50 mg/L. Respectively measure 10.00 mL, 20.00 mL, 30.00 mL, 40.00 mL,
50.00 mL, 60.00 mL of tannin acid solution into 100 mL volumetric flasks. Fill water to
scale and mix well. At 254 nm wavelength, with buffer solution as reference fluid, USE 10
mm quartz cuvette to measure the absorbance of each solution. And draw tannin acid
standard curve according to the absorbance values and the corresponding solution
concentrations.
B.6 Measurement steps
B.6.1 Measure 100 mL of prepared sample for weighing, accurate to 0.0001 g. Place in
250 mL beaker to soak for 24 hours. Use water to wash away the floating ash and floating
carbon (need to collect the floating carbon). Then slowly fill specimen into organic glass
column which has been filled with water, so as to make the height of the specimen to
reach to position of 120 mm (specimen shall be fully soaked into water).
B.6.2 The water in the rest of specimen, along with the collected floating carbon, shall be
filtered away. Place in electrothermal constant temperature drying box of 150°C±5°C for 2
hours. Then place in the dryer. Weigh after it is cool, accurate to 0.000 1 g.
B.6.3 Fill 3.0 L to 4.5 L of tannin acid solution into 500 mg/L tubualted bottle.
B.6.4 Turn on flow-meter. The humic acid solution goes through the specimen layer from
top to bottom at speed of 37.4 mL/min. Collect 2.5 L of filtrate at the same time.
B.6.5 Take 5 mL of filtrate to fill into 100 mL volumetric flask. Dilute with water to scale and
mix well. At 254 nm wavelength, with buffer solution as reference fluid, USE 10 mm quartz
cuvette to measure the absorbance of the filtrate. And find out the tannin acid
concentration from the standard curve.
B.7 Result calculation
B.7.1 Tannin acid adsorption is expressed as “w”. The unit is milligram per gram (mg/g).
Calculation is made according to the formula (B.1).
)1.(...)ρρ(
10 B
mm
VBw
Where.
ρ0 – water-inlet humic acid solution concentration, the unit is milligram per liter (mg/L);
ρ1 – filtrate humic acid solution concentration, the unit is milligram per liter (mg/L);
V - filtrate volume, the unit is liter (L);
m1 – mass of 100 mL activated carbon, the unit is gram (g);
m2 – mass of residual activated carbon, the unit is gram (g).
B.7.2 For each sample, conduct parallel determination for 2 specimen. The results shall
be expressed in arithmetic mean. The calculation result shall be accurate to 2 decimal
places.
B.7.3 The difference between 2 measurement results shall not be greater than 0.03 mg/g.
B.8 Test report
The test report shall include the following contents.
a) specimen No.;
b) applied standard;
c) applied method;
d) test item;
e) test result;
f) test personnel;
g) test date.
...
......
 
(Above excerpt was released on 2014-10-15, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT7701.2-2008