GB/T 26900-2011 English PDF (GBT26900-2011)

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GB/T 26900-2011: Bamboo charcoal for air-purification
GB/T 26900-2011
GB
ICS 79.040
B 67
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Bamboo charcoal for air-purification
ISSUED ON. SEPTEMBER 29, 2011
IMPLEMENTED ON. DECEMBER 1, 2011
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 ... 4 
2  Terms and definitions ... 4 
3  Requirements ... 4 
4  Inspection methods ... 5 
4.1  Determination of moisture content ... 5 
4.2  Determination of ash content ... 6 
4.3  Determination of volatile matter content ... 8 
4.4  Determination of the content of fixed carbon ... 9 
4.5  Determination of formaldehyde adsorption rate ... 10 
4.6  Determination of benzene absorption rate... 12 
4.7  Determination of TVOC adsorption rate ... 14 
5  Inspection rules ... 16 
6  Logo, package, transportation and storage ... 18 
Foreword 
This Standard was proposed by China's State Forestry Administration (SFA).
This Standard shall be under the jurisdiction of National Technical Committee on Bamboo
and Rattan of Standardization Administration of China.
The responsible drafting organizations of this Standard. Nanjing Forestry University,
Quzhou Minxin Charcoal Co., Ltd, Suichang Wenzhao Bamboo Charcoal Co., Ltd, Anji
Jianzhong Bamboo Charcoal Co., Ltd, Zhejiang Fulaisen Zhongzhu Science Co., Ltd,
Jiangxi Qingjing Science Co., Ltd, Yuyao Industry and Trading Co., Ltd, Zhejiang
Maitanwong Ecology Development Co., Ltd, Suichang Biyan Bamboo Charcoal Co., Ltd,
Quzhou JingLi Bamboo Carbon Factory, Quzhou Modern Charcoal Industry Co., Ltd,
Suichang Bamboo Charcoal Plant, and Fujian Jian'ou Special Art Bamboo And Wood Co.,
Ltd.
The chief drafting staffs of this standard. Zhang Qisheng, Zhou Jianbin, Bao Ligen, Chen
Wenzhao, Ding Jianzhong, Wang Zhengyu, Xiong Zhijun, Wang Jianyu, Fang Yunjian, Tu
Zhilong, Ning Jing, Wu Quansheng, Li Jinming, and Zhou Juan.
Bamboo charcoal for air-purification
1  Scope 
This Standard specifies the definitions, requirements, test methods, inspection rules,
package, logo, transportation, and storage of bamboo charcoal for air-purification.
This Standard is applicable to bamboo charcoal that purifies formaldehyde, benzene, total
volatile organic gas (TVOC), and other harmful gases in the air. And it is not applicable to
bamboo charcoal for air-purification through special processing, such as various modified
bamboo charcoal.
2  Terms and definitions 
The following terms and definitions apply to this Standard.
2.1
Bamboo charcoal for air-purification
Under the conditions of high temperature and limited oxygen (or isolated oxygen), the
bamboo is heated through pyrolysis, so as to obtain the black solid.
2.2
Fixed carbon
The remaining effective carbon after the charcoal is burned at high temperature.
2.3
Formaldehyde adsorption rate
A certain mass of dried test sample is placed in adsorption instrument that is fully filled
with adsorbtion gas. ABSORB for 24h at the constant temperature of 20°C. It
[Formaldehyde adsorption rate] is the percentage OF the weight-gain of the test sample
TO the original test sample’s mass.
3  Requirements 
3.1 Appearance. black, odorless, tasteless, amorphous solid.
4.3 Determination of volatile matter content
4.3.1 Method summary
At the temperature of (850±20)°C, test sample with certain mass is heated for 7min with
isolation from the air. The percentage OF lost mass TO the original test sample’s mass is
the volatile matter content. If obvious sparks are generated in the experiment, the
experiment shall be redone.
4.3.2 Instruments
4.3.2.1 Porcelain crucible. Height. 40mm; diameter of upper mouth. 30mm; bottom outer
diameter. 18mm; cover outer diameter. 35mm; groove outer diameter. 29mm; external
groove depth. 4mm.
4.3.2.2 High temperature electric furnace. Provided with temperature control device that
can maintain at the temperature of (850±20)°C.
4.3.2.3 Crucible holder. Made of nichrome wire. Crucible’s size does not exceed the limit
of constant temperature region in the high temperature furnace. And MAKE the bottom of
the crucible on the shelf of the crucible to be 10mm - 15mm from the bottom of the
furnace.
4.3.2.4 Analytical balance. with sensitivity of 0.1mg.
4.3.2.5 Stopwatch or time clock.
4.3.2.6 Dryer. with desiccant (Not-deliquescent bulk-shape calcium chloride or silica gel)
in it.
4.3.3 Operating methods
WEIGH 1g (accurate to 0.1mg) of test sample that has been crushed and gone through
0.25mm (60-mesh) sieve. PLACE in the porcelain crucible that has been burned to
constant weight at (850±20)°C. COVER the crucible. Gently SHAKE to make the test
sample spread out. PLACE it on the crucible shelf. Then, quickly PLACE it into the high
temperature electric furnace that has been pre-heated to 850°C. The crucible locates
above or below the measurement point of the thermocouple. CONTINUE to heat it for
7min. The temperature of furnace drops at the beginning, but shall be restored to
(850±20)°C within 3min. If there are obvious sparks, it shall be redone.
Finally, TAKE the crucible out and PLACE it on the porcelain plate. COOL it in the air for
5min. PLACE it in a dryer and COOL it to the room temperature. And WEIGH it.
4.3.4 Result calculation
CALCULATE the volatile matter content determination results of bamboo charcoal for
air-purification by formula (3).
Where.
V — Volatile matter content of test sample, %;
m1 — Mass of test sample, in unit of gram (g);
m2 — Mass of test sample after heating, in unit of gram (g);
4.3.5 Allowable errors
The errors of 2 parallel determination results of volatile matters shall not exceed 0.5%.
4.4 Determination of the content of fixed carbon
4.4.1 Method summary
CALCULATE the fixed carbon content BY the mass of dried bamboo charcoal MINUS its
ash content and volatile matter content.
4.4.2 Instruments
4.4.2.1 The ash content test instrument, same as 4.2.2.
4.4.2.2 The volatile matter content test instrument, same as 4.3.2.
4.4.3 Operating methods
4.4.3.1 CRUSH the analysis test sample until all can go through the 0.25mm-sieve (60
meshes). DRY to constant weight at the temperature of 102°C~105°C. The mass of the
test sample shall not be less than 30g, for the use of testing the ash content and volatile
matters.
4.4.3.2 The operating method of determination of ash content is shown in 4.2.3.
4.4.3.3 The operating method of determination of volatile matter content is shown in
4.3.3.
4.4.4 Result calculation
CALCULATE the fixed carbon content determination results of bamboo charcoal for
air-purification by formula (4).
1 — The specified position in the adsorption instrument;
2 — Grating.
Figure 1 Special determinator for gas adsorption of bamboo charcoal
4.5.3.2 Electrothermal constant-temperature drying oven. with automatic temperature
control device, and with blower or natural ventilation device.
4.5.3.3 Climate box. 1m3.
4.5.3.4 Weighing bottle. 60mm × 30mm.
4.5.3.5 Analytical balance. with sensitivity of 0.1mg.
4.5.3.6 Dryer. with desiccant (Not-deliquescent bulk-shape calcium chloride or silica gel)
in it.
4.5.4 Operating methods
WEIGH 1g (accurate to 0.1mg) of test sample that has been crushed and gone through
0.25mm (60-mesh) sieve. PLACE in the weighing bottle that has been con...