GB/T 27741-2018 PDF English
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Paper and board - Determination of migratable fluorescent whitening agents
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| GB/T 27741-2011 | English | 359 |
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Paper and board -- Determination of migratable fluorescent whitening agents
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GB/T 27741-2018: Paper and board - Determination of migratable fluorescent whitening agents---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT27741-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 85.010
Y 30
Replacing GB/T 27741-2011
Paper and board - Determination of migratable
fluorescent whitening agents
Issued on. DECEMBER 28, 2018
Implemented on. JULY 01, 2019
Issued by. State Market Regulatory Administration;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 5
4 Sampling and preparation of specimen... 6
5 Qualitative determination... 6
6 Quantitative determination... 8
7 Detection limit and recovery rate... 13
8 Precision... 13
9 Test report... 13
Appendix A (Normative) Information on the name and chemical structure of
fluorescent whitening agent... 14
Appendix B (Informative) Liquid chromatogram of HPLC analysis of fluorescent
whitening agent standards... 15
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 27741-2011 "Paper and board - Determination of
migratable fluorescent whitening agents". As compared with GB/T 27741-2011,
the main technical changes except editorial changes are as follows.
- MODIFY the scope of application of the standard (see Chapter 1; Chapter
1 of the 2011 edition);
- MODIFY the definition of migratable fluorescent whitening agents (see 3.1;
3.1 of the 2011 edition);
- MODIFY the preparation of the specimen (see 4.2; 5.4.1 of the 2011 edition);
- MODIFY the expression of the glass funnel (see 5.3.2; 5.3.2 of the 2011
edition);
- ADD the balance (see 5.3.4, 6.1.3.2, 6.2.3.2);
- ADD the constant temperature oscillating water bath (see 5.3.5 and 6.1.3.3);
- MODIFY the expression of the test procedure in the qualitative
determination (see 5.4; 5.4 of the 2011 edition);
- MODIFY the expression of the principle of UV-visible spectrophotometry
(see 6.1.1; 6.1.1 of the 2011 edition);
- MODIFY the representation of water in reagents and materials (see 6.1.2
and 6.2.2; 6.1.2 and 6.2.2.1 of the 2011 edition);
- MODIFY the pH of the extracts in reagents and materials (see 6.1.2.2 and
6.2.2.5; 6.1.2 and 6.2.2 of the 2011 edition);
- MODIFY the formulation of standard solutions in reagents and materials
(see 6.1.2 and 6.2.2; 6.1.2 and 6.2.2 of the 2011 edition);
- MODIFY the way the results are expressed (see 6.1.5 and 6.2.5; 6.1.5 and
6.2.5 of the 2011 edition);
- MODIFY the analytical methods for high performance liquid
chromatography (see 6.2; 6.2 of the 2011 edition);
- ADD the lower detection limits and recovery rates (see Chapter 8);
- MODIFY test report (see Chapter 9; Chapter 9 of the 2011 edition);
- ADD the normative appendix A, Information on the name and chemical
structure of fluorescent whitening agent;
- ADD the informative appendix B, Liquid chromatograms of HPLC analysis
of standard substance of fluorescent whitening agents.
Please note that some of the contents of this document may involve patents.
The issuing organization of this document is not responsible for identifying
these patents.
This standard was proposed by the China Light Industry Association.
This standard shall be under the jurisdiction of the National Paper Industry
Standardization Technical Committee (SAC/TC 141).
Drafting organizations of this standard. National Paper Quality Supervision and
Inspection Center, Shenzhen Inspection and Quarantine Science Research
Institute, China Pulp and Paper Research Institute Co., Ltd., Chongqing Liwen
Sanitary Paper Manufacturing Co., Ltd.
The main drafters of this standard. Xie Tangtang, Wang Chengyun, Gao Jun, Li
difei, Xu Rong, Lin Junfeng, Gu Haofei.
This standard replaces the standard previously issued as follows.
- GB/T 27741-2011.
Paper and board - Determination of migratable
fluorescent whitening agents
Caution - Personnel using this standard shall have practical experience
in formal chemistry experiment work. This standard does not address all
safety issues; users are responsible for taking appropriate safety and
health measures and ensuring compliance with the relevant national
regulations.
1 Scope
This standard specifies qualitative and quantitative methods for the
determination of migratable fluorescent whitening agents in paper and board.
The qualitative analysis method of the migratable fluorescent whitening agent
in this standard is applicable to various paper and board; the UV-visible
spectrophotometry in the quantitative analysis method is suitable for the mobile
fluorescent whitening agent (in VBL) in paper and board. The high performance
liquid chromatography is suitable for the determination of the content of seven
fluorescent whitening agents (see Appendix A) in paper and board; other
fluorescent whitening agents can be tested with reference to it. The migratable
fluorescent whitening agent in the pulp can be tested by reference to qualitative
and quantitative methods in the 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 450 Paper and board - Sampling for testing and identification of
machine and cross direction, wire side and felt side
GB/T 6682 Water for analytical laboratory use. Specification and test
methods
3 Terms and definitions
The following terms and definitions apply to this document.
4 Sampling and preparation of specimen
4.1 Sampling
The sample is taken according to the provisions of GB/T 450.
4.2 Preparation of specimen
Cut the specimen into small pieces of about 5 mm x 5 mm. Mix them uniformly.
5 Qualitative determination
5.1 Principles
After using an extract having a pH of 7.5 ~ 9.0 to extract the fluorescent
whitening agent in paper and board, adjust the pH of the filtrate to 3.0 ~ 5.0.
5.2 Reagents and materials
Unless otherwise stated, the reagents used are of analytical pure and the test
water shall meet the grade-3 water as specified in GB/T 6682.The reagents
and materials used shall be free of fluorescence under UV light.
5.2.1 Gauze. The size is about 5 cm x 5 cm.
5.3 Instruments
5.3.1 Conical flask. 250 mL.
5.3.2 Glass funnel. Glass core funnel with specification G1.
5.3.3 Glass watch glass.
5.4 Test procedure
5.4.1 Extraction of specimen
Accurately weigh 2.0 g of the specimen and place it in a conical flask (5.3.1).
Add 100 mL of the extract (5.2.4) to the flask. Whilst slowing shaking the flask,
extract it at room temperature for 10 min.
5.4.2 Blank test
Except for not adding specimen, follow the procedures of 5.4.1 to perform the
blank test.
5.4.3 Testing
Place the watch glass on which the specimen gauze (5.4.1) and the blank test
gauze (5.4.2) are placed at about 20 cm under the UV lamp (5.3.6) in the dark
room or dark box, to observe the gauze’s fluorescence phenomenon. Each
specimen is subjected two parallel determinations.
6 Quantitative determination
6.1 UV-visible spectrophotometry
6.1.1 Principle
The specimen is extracted by a water bath at 80 °C. After the extraction solution
is filtered, use an ultraviolet-visible spectrophotometer to determine the
absorbance of the fluorescent whitening agent in the specimen filtrate. With
reference to the working curve of VBL standard solution of the fluorescent
whitening agent, determine contents of the fluorescent whitening agent in the
sample.
6.1.2 Reagents and materials
Unless otherwise stated, the reagents used are of analytical pure and the test
water shall meet the grade-2 water as specified in GB/T 6682.
6.1.2.5 Fluorescent whitening agent VBL standard working solution. Accurately
transfer a certain volume of fluorescent whitening agent VBL standard stock
solution (6.1.2.4) as needed. Use the extract (6.1.2.2) to dilute it to the
appropriate concentration of standard working solution. The standard working
solution is prepared before use. The linear range of the measurement under
different working conditions of different instruments is different. The linearity of
the standard solution concentration range from 1 mg/L to 20 mg/L has been
proved to be satisfactory.
6.1.2.6 Microporous membrane. 0.45 μm.
6.1.3 Instruments
6.1.4 Test procedure
6.1.5 Calculation and representation of results
Calculate the content of the migratable fluorescent whitening agent w (in VBL)
in the specimen according to formula (1).
6.2 High performance liquid chromatography
6.2.1 Principle
The specimen is extracted by a water bath at 80 °C. After the extracted solution
is filtered, use the high performance liquid chromatography to analyze it. Use
the retention time for qualitative and the external standard method for
quantitative.
6.2.2 Reagents and materials
Unless otherwise stated, the reagents used are of analytical pure and the test
water shall meet the grade-1 water as specified in GB/T 6682.
6.2.2.4 Ammonia. 0.1%.
6.2.2.5 Extract. The aqueous solution the pH of which is adjusted by 0.1%
ammonia (6.2.2.4). The pH of the solution is 7.5 ~ 9.0.
6.2.2.6 Fluorescent whitening agent standard stock solution (1000 mg/L).
Accurately weigh 0.1000 g of the fluorescent whitening agent standard
substance as listed in Appendix A. Respectively, use extract (6.2.2.5) to
dissolve it. Make its volume reach to 100 mL.
6.2.3 Instruments
6.2.3.1 High performance liquid chromatograph, equipped with a fluorescence
detector (FLD).
6.2.3.2 Balance. The sensitivities are 0.1 g and 0.1 mg.
6.2.4 Test procedure
6.2.4.1 Extraction of specimen
It is performed according to 6.1.4.1.
6.2.4.2 Blank test
Except for not adding specimen, follow the procedures of 6.1.4.1 to carry out
the blank test.
6.2.4.3 Determination
7 Detection limit and recovery rate
The detection limit of UV-visible spectrophotometry is 20.0 mg/kg. The
detection limit of high performance liquid chromatography is 1.0 mg/kg.
8 Precision
In the same laboratory, the same operator uses the same equipment according
to the same test method to perform mutually independent tests for the same
tested object within a short period of time.
9 Test report
The test report shall include at least the following.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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