QB/T 2900-2012 English PDF (QBT2900-2012)

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QB/T 2900-2012: Oral care and cleansing products. Sodium lauryl sulfate for toothpaste
QB/T 2900-2012
LIGHT INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.40
Classification number: Y43
Filing number: 36654-2012
Replacing QB/T 2900-2007
Oral care and cleansing products - Sodium lauryl
sulfate for toothpaste
ISSUED ON: MAY 24, 2012
IMPLEMENTED ON: NOVEMBER 01, 2012
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Product classification ... 5 
4 Requirements ... 5 
5 Test methods ... 7 
6 Inspection rules ... 18 
7 Marking, packaging, transportation, storage, shelf life ... 20 
Oral care and cleansing products - Sodium lauryl
sulfate for toothpaste
1 Scope
This standard specifies the classification, requirements, test methods,
inspection rules and markings, packaging, transportation, storage, shelf life of
sodium lauryl sulfate (abbreviated as K12).
This standard applies to fatty alcohols prepared by hydrogenation of natural oils
and fats (main components are C12~14 alcohols), sodium lauryl sulfate prepared
by sulfurization and neutralization with sulfur trioxide, including powders,
needles (grain), liquid products.
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 191 Packaging - Pictorial marking for handling of goods
GB/T 601 Chemical reagent - Preparations of standard volumetric solutions
GB/T 602 Chemical reagent - Preparations of standard solutions for
impurity
GB/T 603 Chemical reagent - Preparations of reagent solution for use in test
GB/T 5173 Surface active agents - Detergents - Determination of anionic-
active matter content - Direct two-phase titration procedure
GB/T 5009.74 Method for limit test of heavy metals in food additives
GB/T 5009.76 Determination of arsenic in food additives
GB/T 6368 Surface active agents - Determination of pH of aqueous solution
- Potentiometric method
GB 8170 Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 13173.1 Method of sample division for detergents
GB 6283-2008 Chemical products - Determination of water Karl Fischer
method (general method)
Ministry of Health of the People's Republic of China
The Second Pharmacopoeia of the People's Republic of China
JJF 1070-2005 Rules of metrological testing for net quantity of products in
prepackages with fixed content
Order of the General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China [2005] No.75 "Measures for
the Supervision and Management of Quantitative Packaging Commodity
Measurement”
3 Product classification
Sodium lauryl sulfate is divided into three types according to form: powder,
needle (grain), liquid products.
Structural formula: CH3(CH2)nOSO3Na (main component n = 11)
Carbon chain distribution and odor evaluation shall be agreed by both parties.
4 Requirements
4.1 Identification (Method 1)
The identification reaction of sodium salt shall be shown by a 10% aqueous
solution of sodium lauryl sulfate. (See Appendix III of Pharmacopoeia II of the
People's Republic of China).
It shall be acidified by adding 10% aqueous solution of sodium lauryl sulfate
and hydrochloric acid, boiling for 20 minutes under low heating, to show the
identification reaction of sulfate through solution. (See Appendix III of the
Pharmacopoeia II of the People's Republic of China).
Identification (Method 2)
Method principle: Use Fourier transform infrared spectrum for identification.
Operation procedure: Refer to Appendix IVC Infrared Spectrophotometry of
"The Pharmacopoeia II of the People's Republic of China"; the infrared
absorption spectrum of this product shall be consistent with that of the standard
5 Test methods
Unless otherwise specified in the analysis, it shall use analytical reagents and
distilled water or water of equivalent purity.
The test solution, preparation, standard titration solution and impurity standard
solution used in this standard shall be prepared in accordance with the
provisions of GB/T 601, GB/T 602, GB/T 603, unless no other requirements are
indicated.
5.1 Identification test
5.1.1 The identification reaction test of the development of sodium salt by 10%
aqueous solution of sodium lauryl sulfate is carried out according to the method
specified in Appendix III of the "Pharmacopoeia of the People's Republic of
China".
5.1.2 A 10% aqueous solution of sodium lauryl sulfate is acidified with
hydrochloric acid, then boiled for 20 minutes under low heat. The identification
reaction test of the sulfate development is carried out according to the method
specified in Appendix III of the "Pharmacopoeia of the People's Republic of
China".
5.1.3 Refer to the Appendix IVC Infrared spectrophotometry in “Pharmacopoeia
II of the People's Republic of China", the infrared absorption spectrum of this
product is consistent with that of the standard product.
5.2 Preparation of specimen
The laboratory samples of sodium lauryl sulfate are prepared and stored in
accordance with the provisions of GB/T 13173.1.
5.3 Appearance
Carry out visual inspection under the condition of non-direct light. Compare with
the standard requirements.
5.4 Determination of active content
Method 1: Subtractive method (arbitration method)
The content (wα) of the active substance in sodium lauryl sulfate is expressed
by mass fraction; calculated by the formula (1) and formula (2) using the
subtractive method:
Powder and needle (grain) products:
Where:
w5 - The total solid content of liquid product, %.
m1 - The mass of the sample after drying, in grams (g);
m2 - The mass of the sample before drying, in grams (g).
Method 2: Two-phase titration
It is performed according to GB/T 5173.
5.5 Determination of soluble matter content (w1) of petroleum ether
5.5.1 Reagents
a) Anhydrous sodium sulfate;
b) Ethanol: 95%;
c) Ethanol solution: 50%;
d) Petroleum ether, boiling range 30 °C ~ 60 °C, distillation residue shall be
not more than 0.002% (mass fraction).
5.5.2 Instruments
a) Beaker: 400 mL;
b) Separatory funnel: 500 mL;
c) Conical bottle: 250 mL.
5.5.3 Operating procedures
Weigh 10 g of sample, accurate to 0.0001g, in a 400 mL beaker. Add 100 mL
of water and 100 mL of 95% ethanol to dissolve the sample. Transfer the
solution to a 500 mL separatory funnel. Use the 50% ethanol solution to wash
the residue from the beaker into the separatory funnel, until the total volume is
about 300 mL. Then add 50 mL of petroleum ether (boiling range 30 °C ~ 60 °C).
Shake it for 30 s. Let it stand still for stratification. If necessary, add a small
amount of 95% ethanol to break the emulsion.
Separate the lower alcoholic water phase and put it in another 500 mL
separatory funnel. Add 50 mL of petroleum ether (boiling range 30 °C ~ 60 °C)
for extraction. Extract the alcoholic water phase alternately three times in this
way.
Combine the petroleum ether layer separated by the three extractions in
c) Suction filter bottle: 500 mL;
d) Quantitative filter paper: medium speed;
e) High temperature furnace: can control the temperature at (900 ± 10) °C ...