GB/T 2910.15-2009 PDF English
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Textiles -- Quantitative chemical analysis -- Part 15: Mixtures of jute and certain animal fibers (method by determining nitrogen content)
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GB/T 2910.15-2009: Textiles -- Quantitative chemical analysis -- Part 15: Mixtures of jute and certain animal fibers (method by determining nitrogen content)
---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/GBT2910.15-2009
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.01
W 04
Partially replacing GB/T 2910-1997
Textiles - Quantitative chemical analysis - Part 15: Mixtures
of jute and certain animal fibers (method by determining
nitrogen content)
(ISO 1833-15:2006, MOD)
ISSUED ON: JUNE 15, 2009
IMPLEMENTED ON: JANUARY 01, 2010
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC.
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Principles ... 6
4 Reagents ... 6
5 Equipment ... 7
6 Sampling and laboratory sample pretreatment ... 7
7 Test steps ... 8
8 Calculation and presentation of results ... 9
9 Precision ... 9
Textiles - Quantitative chemical analysis - Part 15: Mixtures
of jute and certain animal fibers (method by determining
nitrogen content)
1 Scope
This Part of GB/T 2910 specifies the method for determining the content of each
component in a binary mixture of jute and certain animal fibers, by the nitrogen content
method after removal of non-fibrous substances. Among them, the animal fiber can be
a kind of wool or other animal fibers, OR the mixture of both.
This Part does not apply to blended products containing nitrogen in dyes or finishes.
Note: Since the principle of this method is different from the principle of selective dissolution
in other parts, the format is different from other parts of GB/T 2910.
2 Normative references
The provisions in following documents become the provisions of this Part through
reference in this Part of GB/T 2910. For the dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this Part; however,
parties who reach an agreement based on this Part are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition of
the referenced document applies.
GB/T 2910.1 Textiles - Quantitative chemical analysis - Part 1: General principles
of testing (GB/T 2910.1-2009, ISO 1833-1:2006, IDT)
3 Principles
By measuring the nitrogen content of the mixture AND knowing the theoretical
nitrogen content of two single components, the mass fraction of each component is
calculated.
4 Reagents
All reagents used are of analytical grade.
specimen). Reflux for 30 min. Take out the sample. Filter it. Put the sample back into
the conical flask. Use water to repeat extraction. Filter it. Carry out squeezing, suction
or centrifugal dehydration. Dry it in the air.
Warning: Toluene and methanol will cause harm to the human body, so
comprehensive protection measures shall be taken when using them.
7 Test steps
Regarding sampling, drying, weighing, follow the provisions of GB/T 2910.1. Then
operate as follows.
Take about 1 g of the pretreated specimen. Dry it in a weighing bottle. Cool it in a
desiccator. Weigh it. Transfer the specimen into a dry Kjeldahl decomposition flask.
Weigh the weighing bottle again immediately. Use the difference, to obtain the dry mass
of the specimen.
Put the following reagents into the Kjeldahl decomposition flask, which contains the
specimen, in turn: 2.5 g of potassium sulfate (4.4), 0.1 g ~ 0.2 g of selenium dioxide
(4.5), 10 mL of sulfuric acid solution (4.3). Slowly heat the flask at low heat. After all
the fibers are destroyed, heat vigorously again, until the solution becomes clear and
almost colorless. Continue heating for 15 min. Cool the flask. Carefully add 10 mL ~
20 mL of water. Cool it. Transfer all the solution into a 200 mL graduated flask. Add
water to dilute to the mark, to form a digestive solution.
In a 100 mL conical flask, add 20 mL of boric acid solution. Place it under the condenser
of the Kjeldahl distillation equipment. Insert the receiving tube under the boric acid
liquid surface. Accurately pipette 10 mL of the digestive solution into the distillation
flask. Take more than 5 mL of sodium hydroxide solution into the separatory funnel.
Gently open the stopper, so that the solution slowly flows into the distillation flask. If
the digestion solution and sodium hydroxide solution separate into two layers, shake
gently to mix well. Warm the distillation flask gently. Lead in the steam from a steam
generator.
After collecting about 20 mL of distillate. Lower the receiving bottle, so that the lower
end of the condenser tube is 20 mm away from the liquid surface. Then distill for 1 min.
Use water to rinse the end of the tube. Make the eluent flow into the receiving bottle.
Remove the receiving bottle. Put the second receiving bottle, which contains 10 mL
boric acid solution, in place. Collect about 10 mL of distillate.
Use sulfuric acid (4.9) and the mixed indicator (4.7), to titrate the two distillates,
respectively. Record the total amount of the titrant. If the titer of the second distillation
flask exceeds 0.2 mL, discard this result. Then take a new digestate and re-distill.
At the same time, do a blank test. Only draw reagents when digesting and distilling.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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