FZ/T 50014-2008 PDF English
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Method for the determination of residual sulphur in viscose fibres - Direct iodimetry
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FZ/T 50014-2008: Method for the determination of residual sulphur in viscose fibres - Direct iodimetry
---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/FZT50014-2008
FZ
TEXTILE INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 59.060.01
W 50
Method for the determination of residual
sulphur in viscose fibres - Direct iodimetry
ISSUED ON: FEBRUARY 01, 2008
IMPLEMENTED ON: JULY 01, 2008
Issued by: National Development and Reform Commission of the People’s
Republic of China
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Principle ... 4
5 Reaction formula ... 5
6 Reagents and materials ... 5
7 Instruments ... 5
8 Sampling ... 6
9 Test environment ... 6
10 Analysis steps ... 6
11 Result calculation ... 7
12 Test report ... 8
Annex A (informative) Preparation of iodine standard titration solution ... 10
Method for the determination of residual
sulphur in viscose fibres - Direct iodimetry
1 Scope
This Standard specifies the method for the determination of residual sulphur by
redox-direct iodometry.
This Standard is applicable to fibres made by viscose process.
2 Normative references
The following documents contain the provisions which, through reference in this
Standard, become the provisions of this Standard. For dated references, their
subsequent amendments (excluding corrigendum) or revisions do not apply to
this Standard. However, the parties who enter into agreement based on this
Standard are encouraged to investigate whether the latest versions of these
documents are applicable. For undated reference documents, the latest
versions apply to this Standard.
GB/T 601 Chemical reagent - Preparations of standard volumetric solutions
GB/T 4146 Textile terms and terminology (parts of chemical fibres)
GB/T 8170 Rules for rounding off of numerical values
GB/T 14334-2006 Sampling method for man-made staple fibres
3 Terms and definitions
For the purpose of this Standard, the terms and definitions specified in GB/T
4146 apply.
4 Principle
The sulphur attached to the viscose fibre reacts with sodium sulfite to produce
sodium thiosulfate, which is titrated with iodine standard solution. The end point
of the titration is judged according to the color change of the indicator. The
residual sulphur content is calculated according to the volume consumed.
7.3 Measuring cylinder: the capacity is 200 mL.
7.4 Measuring cup: the capacity is 20 mL.
7.5 Volumetric flask: the capacity is 100 mL.
7.6 Pipette: the capacity is 50 mL.
7.7 Iodine flask: the capacity is 500 mL.
7.8 Ground spherical condenser tube.
7.9 Vacuum filtration device, including vacuum pump, suction filter flask, buffer
flask, etc.
7.10 Buchner funnel.
7.11 Cooling device.
7.12 Heating device, ensuring constant temperature (100 °C) requirements.
7.13 Container, which can store samples, and the quality is known.
7.14 Thermometer, 0 ~ 100 °C, accuracy of 1 °C.
8 Sampling
- Unpackaged laboratory samples are taken out as needed;
- Laboratory samples in batch samples are taken according to the provision
of GB/T 14334-2006.
Do not take out rolls that have been accidentally damp, scratched or of which
the packaging has been opened during transportation.
9 Test environment
The test can be carried out in an environment with a temperature of 20 °C ±
5 °C, avoid sunlight indoors.
10 Analysis steps
10.1 Randomly TAKE about 20 g of sample, MIX them evenly and DIVIDE them
into four parts, each of about 5 g, accurate to 0.001 g. Two of them are used
for parallel test of residual sulphur content; the other two are used for moisture
m2 - the mass of the sample and container after baking, in grams (g);
mw - the mass of the sample before baking, in grams (g).
It is calculated to three decimal places, and rounded off to two decimal places
according to GB/T 8170.
11.2 Residual sulphur content of the sample
It is calculated according to formula (2):
where
S - the residual sulphur content of the sample, in milligrams per 100 grams
(mg/100 g);
V1 - the volume of iodine standard titration solution consumed by the sample,
in milliliters (mL);
V0 - the volume of iodine standard titration solution in the blank test, in
milliliters (mL);
c - the concentration of iodine standard titration solution, in moles per liter
(mol/L);
M - the molar mass of sulphur, in grams per mole (g/mol) (M = 32.06);
ms - the mass of the sample, in grams (g);
W - the moisture content of the sample, %.
The result is calculated and expressed to one decimal place.
11.3 Allowable error
The moisture content test and the residual sulphur test shall have parallel tests,
and the arithmetic mean of the two parallel test results shall be taken as the
determination result. The relative error of the moisture content test shall not
exceed 0.5 %; the relative error of the residual sulphur test shall not exceed
10 %.
12 Test report
a) sample name, source, batch number, etc.;
Annex A
(informative)
Preparation of iodine standard titration solution
A.1 Preparation of iodine standard titration solution [cቀ𝟏𝟐 𝐈𝟐ቁ = 0.05 mol/L]
WEIGH 6.5 g of iodine and 17.5 g of potassium iodide; DISSOLVE in 100 mL
of water; DILUTE to 1000 mL; SHAKE well; STORE in a brown bottle.
A.2 Calibration of iodine standard titration solution [cቀ𝟏𝟐 𝐈𝟐ቁ = 0.05 mol/L]
MEASURE 35.00 mL ~ 40.00 mL of the prepared iodine solution; PLACE in an
iodine flask; ADD 150 mL of water (15 °C ~ 20 °C); TITRATE with sodium
thiosulfate standard titration solution [c(Na2S2O3) = 0.05 mol/L]; ADD 2 mL of
starch indicator (10 g/L) near the end point; continue to TITRATE until the blue
color of the solution disappears.
At the same time, carry out a blank test of iodine consumed by water: TAKE
250 mL of water (15 °C ~ 20 °C); ADD 0.05 mL ~ 0.20 mL of the prepared iodine
solution and 2 mL of starch indicator (10 g/L); TITRATE with sodium thiosulfate
standard titration solution [c(Na2S2O3) = 0.05 mol/L] until the blue color of the
solution disappears.
The concentration of iodine standard titration solution [cቀଵଶ Iଶቁ ] is calculated
according to formula (A.1):
where
cቀଵଶ Iଶቁ - the concentration of iodine standard titration solution, in moles per
liter (mol/L);
V1 - the volume of sodium thiosulfate standard titration solution, in milliliters
(mL);
V2 - the volume of sodium thiosulfate standard titration solution for the blank
test, in milliliters (mL);
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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