This standard specifies the determination of moisture and volatile content in soap by oven method. This standard is applicable to the determination of moisture and other substances lost by soap under (103±2)℃ heating conditions, and is not applicable to compound soap. QB/T 2623.4-2003 Soap test method Determination of moisture and volatile content in soap Oven method QB/T2623.4-2003 Standard download decompression password: www.bzxz.net

ICS71.100
Classification number: Y43
Registration number: 13170-2004
Light Industry Standard of the People's Republic of China
QB/T2623.4—2003
Replaces QB/T3751-1999
Soaps-Determination of moisture and volatile matter contentOven method, MOD)
2003-12-11 Issued
National Development and Reform Commission of the People's Republic of China Implemented on 2004-05-01
QB/T2623.4-2003
This standard is the fourth standard in the QB/T2623 "Soap Test Method" series of standards. This series of standards consists of eight standards, the names of which are as follows:
QB/T2623.1
QB/T2623.2
QB/T2623.3
QB/T2623.4
QB/T2623.5
QB/T2623.6
QB/T2623.7
Determination of free caustic soda content in soap
Test method for soap
Determination of total free alkali content in soap
Test method for soap
Total alkali and total fatty matter content in soap Determination of soap test method
Determination of moisture and volatile matter content in soap Oven method soap test method
Determination of ethanol insoluble matter content in soap
Soap test method
Fast test method
Determination of amide content in soap Titration method Determination of insoluble and unsaponifiable matter in soap Fat test method
QB/T2623.8
Determination of phosphate content in soap
Soap test method
This standard is a revision of QB/T3751-1999 "Determination of moisture and volatile matter content in soap - oven method". This standard is modified by ISO672:1978 "Determination of moisture and volatile matter content of soap - oven method" (English version). This standard is redrafted based on ISO672:1978. According to my country's national conditions and laboratory verification, this standard has made the following technical modifications when adopting the international standard: a) The sample weight is changed to 5g
The time for the first drying of the sample to constant weight is extended to 3h, instead of the first 1h in [SO672, for easy operation; b)
c) Repeatability is used to express precision instead of reproducibility in [SO672:1978]. For ease of use, the following editorial changes have been made to this standard: a) The term "this international standard" has been changed to "this standard"; b) The decimal point "," has been used instead of the comma " as a decimal point, and the prefix of the international standard has been deleted.
This standard was proposed by the China Light Industry Federation. This standard is under the jurisdiction of the National Surfactant Detergent Standardization Center. This standard was drafted by the National Detergent Quality Supervision and Inspection Center (Taiyuan). The main drafter of this standard is Liang Hongyan.
This standard was first issued as the national standard GB/T7458-1987 in March 1987, and was converted into the light industry standard QB/T3751-1999 in April 1999. This is the first revision. From the date of implementation of this standard, it replaces the light industry standard QB/T3751-1999 issued by the former State Bureau of Light Industry. T3751-1999 "Determination of moisture and volatile matter content in soap - Oven method". TKAONiKAca
QB/T2623.4-2003
Soap test method Determination of moisture and volatile matter content in soap - Oven method 1 Scope
This standard specifies the determination of moisture and volatile matter content in soap by the oven method. This standard is applicable to the determination of water and other substances lost by soap under heating conditions of (103±2)℃, and is not applicable to compound soap. 2 Normative referenced documents
The clauses in the following documents become clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard; however, all parties that have reached an agreement based on this standard are encouraged to The parties shall study whether the latest versions of these documents can be used. For any undated referenced documents, the latest versions shall apply to this standard. QB/T2623.1-2003 Soap test method Determination of free caustic soda content in soap 3 Test method
3.1 Principle
At the specified temperature, a certain amount of sample is dried to constant weight, and the reduction is weighed. 3.2 Instruments
Pudao experimental instruments and
a) Evaporation III or crystallization dish, @6cm~Φ8cm, depth 2cm~4cm; b) Glass stirring rod;
c) Silica sand, particle size 0.425mm~0.180mm, 40 mesh~100 days, washed and calcined; d) Oven, the temperature can be controlled at (103±2)℃; e) Dryer, equipped with effective desiccant, such as Phosphorus pentoxide, color-changing silica gel, etc., but calcium fluoride should not be used. 3.3 Preparation and storage of samples
Prepare and store according to 3.4 of QB/T2623.1-2003. 3.4 ProcedurebZxz.net
The same sample is measured in duplicate.
3.4.1 Test portion
Weigh about 5g of the sample, accurate to 0.01g.
3.4.2 Determination
Place the glass rod (3.2.b) in the evaporating dish (3.2.a). If the sample to be analyzed is a soft soap or a soap that melts at (103±2)℃, then put 10g of silica sand (3.2.c) in the evaporating dish. Put the evaporating dish and the stirring rod, with or without sand as needed, into an oven (3.2.d) controlled at (103±2)℃ for drying. Cool in a desiccator (3.2.e) for 30 minutes and weigh. Add the test portion (3.4.1) to the evaporating dish. If sand is added, mix it with a stirring rod and place it in an oven (3.2.d) controlled at (103 ± 2) °C.
After 1 hour, take it out of the oven and cool it. Use a stirring rod to crush the material into fine powder. Place it in the oven again. After 3 hours, take it out and evaporate it. Place it in a desiccator, cool it to room temperature and weigh it. Repeat the operation, placing it in the oven for 1 hour each time, until the mass difference between two consecutive weighings is less than 0.01g.
Record the result of the final weighing.
QB/T2623.4—2003
3.5 Result calculation
The content of water and volatiles in soap is X, expressed as mass percentage, calculated according to formula (1): X(%)=m-mzx100
Wherein:
The mass of the stirring rod (and sand) and the test portion before heating, g: m
m2--The mass of the stirring rod (and sand) and the test portion after heating, g: mo--The mass of the stirring rod (and sand) of the evaporating dish, g. The arithmetic mean of the results of two parallel determinations is expressed to an integer as the determination result. 3.6 Precision
The absolute difference between the two independent determination results obtained under repeatability conditions shall not exceed 0.25%, provided that the difference shall not exceed 5% if it exceeds 0.25%.
3.7 Test report
The test report should include the following:
a) All information required to fully identify the sample; b) Reference to the method used (reference to this standard); the results obtained and the expression method used;
d) Test conditions;
e) Any operating details not specified in this standard or optional, and unexpected phenomena that may affect the results; f)
Test date.
TTKAoNiKAca-
People's Republic of China
Light Industry Industry Standard
Soap Test Method
Determination of Water and Volatile Content in Soap-Oven Method
QB/T2623.4-2003
China Light Industry Publishing House-Shan Edition
Light Industry Standardization Editorial Committee-Shan Edition Editorial Address: No. 12 Guanghua Road, Chaoyang District, Beijing
(3rd Floor, Building 1, China Pulp and Paper Research Institute) Postal Code: 100020
Tel: (010)65811585
Any infringement will be investigated
Copyright Exclusive
No.: 155019.2607
Print run: 1-200 copies
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.