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GB/T 33616-2017 (GB/T33616-2017)

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GB/T 33616-2017: PDF in English (GBT 33616-2017)
GB/T 33616-2017
GB
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.30
W 04
Textiles – Evaluation for biodegradability of nonwovens –
Method by analysis of evolved carbon dioxide
ISSUED ON. MAY 12, 2017
IMPLEMENTED ON. DECEMBER 01, 2017
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.
3. No action is required - Full-copy of this standard will be automatically &
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Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Principles ... 4 
4 Reagents and instruments... 4 
5 Preparation and conditioning of sample of sample ... 6 
6 Steps ... 6 
7 Results and evaluation ... 9 
8 Report ... 10 
References ... 11 
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by China Textile Industry Association.
This standard shall be under the jurisdiction of the National Textile
Standardization Technical Committee (SAC/TC 209).
The drafting organizations of this standard. Guangzhou Fiber Products Testing
Institute, China Industrial Textiles Industry Association.
The main drafters of this standard. Zhu Ruodian, Li Guimei, Feng Zeqiang,
Zhang Chuanxiong, Liao Guoying, Zhao Jinyu, Huang Liyi.
Textiles – Evaluation for biodegradability of nonwovens –
Method by analysis of evolved carbon dioxide
1 Scope
This standard specifies the determination and evaluation of the biodegradation
of nonwovens by measuring the evolved carbon dioxide.
This standard applies to nonwovens. Fiber, yarn, other types of textiles and their
products may make reference to this standard.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this Standard.
GB/T 6529 Textiles – Standard atmospheres for conditioning and testing
GB/T 6682 Water for analytical laboratory use – specification and test
methods
GB/T 19276.2-2003 Determination of the ultimate aerobic biodegradability
of plastic materials in an aqueous medium – Method by analysis of evolved
carbon dioxide
3 Principles
The sample is placed in the soil bacteria suspension AND is subject to
biodegradability; after a certain period of time, the percentage of the total
emission amount of inorganic carbon of the sample to the total inorganic carbon
content of the original sample is tested, to judge the biodegradability of this
sample.
4 Reagents and instruments
4.1 Medium and reagents
4.1.1 General provisions
The reagents and water used in this standard, unless otherwise the
microbiological reagents shall comply with the microbiological requirements, in
the absence of other requirements, refer to the analytical pure reagent and the
level III water as specified in GB/T 6682.
(37 ± 2) °C and 190 r/min for 24 h, to obtain the first generation of soil bacteria
suspension.
6.1.3 TAKE 100mL of LB liquid medium; INOCULATE 1 ml of the first generation
of soil bacteria suspension (6.1.2); PLACE it in the constant temperature
oscillator (4.2.6); MAKE it subject to vibration culture at (37 ± 2) °C and 190
r/min for 24 h, to obtain the second generation of soil bacteria suspension.
6.2 Determination of total organic carbon content
6.2.1 TURN on the total organic carbon analyzer (4.2.9); PREHEAT it for 30
min.
6.2.2 CLEAN the high temperature resistant sample cup of the total organic
carbon analyzer; USE the electronic balance (4.2.2) to weigh 50 mg ~ 100 mg
of sample (5.2) (depending on the test range and accuracy of the instrument),
accurate to 0.1 mg; PLACE it into the sample cup.
6.2.3 ADD 100 μL ~ 200 μL of HCl solution at a concentration of 5% to the
sample cup to cover the sample. PLACE the sample cup in the constant
temperature oven (4.2.4) to heat it, to remove the inorganic carbon which may
present in the sample; the heating temperature is 40 °C ~ 80 °C, which shall be
less than the sample melting point for over 10 °C; AND heating time is about 2
h.
6.2.4 INSTALL the sample cup in the proper position of the total organic carbon
analyzer. After setting up the operating procedure, TURN on the instrument, to
make the sample in the sample cup totally burn, AND the evolved CO2 will be
completely collected.
6.2.5 In accordance with the CO2 collected from the sample combustion, USE
the formula (1) to calculate the mass fraction (%) Atc of the organic carbon
content in the sample.
6.2.6 REPEAT steps 6.2.2 ~ 6.2.5; TEST the rest two samples; TAKE the
average value of the 3 samples; ROUND it off to 0.1%.
Where.
Atc - Mass fraction of organic carbon in the sample (%);
mtc - Amount of organic carbon in the sample, in milligrams (mg), accurate
to 0.1mg;
mo1 – Mass of sample weighed in 6.2.2, in milligrams (mg), accurate to 0.1
mg.
6.3 Determination of evolved inorganic carbon
9 forwards to connect the bottle 6; and at the original position of the bottle 9,
ADD one bottle of 200 mL Ba(OH)2 solution (4.1.5).
6.3.7 USE the same interval time in 6.3.6, respectively MAKE titration against
the subsequent Ba(OH)2 solution of the 3 groups; meanwhile ADD fresh
Ba(OH)2 solution; AND the rest can be done in the same manner, until the
sample is subject degradation for 90 days; USE the formula (2) to calculate the
percentage Atic of the total amount of inorganic carbon evolved from the sample
under the biodegradation effect to the sample mass; TAKE the average value
of the two groups of parallel tests; ROUND it off to 0.1%.
Where.
Atic – The percentage of total inorganic carbon evolved by the sample under
the biodegradation effect to the sample mass, %;
mi – The ith inorganic carbon sampling amount of the sample under the
biodegradation effect, in milligrams (mg), accurate to 0.1 mg;
mo2 – The mass of the sample weighed in 6.3.2, in milligrams (mg), accurate
to 0.1 mg.
7 Results and evaluation
7.1 Calculation of biodegradability
The calculation of biodegradability is as shown in formula (3).
Where.
η - Biodegradability, rounding off to 0.1%;
Atic - The percentage of total inorganic carbon evolved by the sample under
the biodegradation effect to the sample mass, %;
Atc – The mass fraction of organic carbon in the sample (%).
7.2 Evaluation of biodegradability
As for the nonwoven fabric of a single fiber component, in the 90 days test time,
when the biodegradability η of the sample reaches above 60%, it can be
deemed that this sample is biodegradable.
......
 
(Above excerpt was released on 2017-09-15, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT33616-2017