QB/T 2721-2005 Leather chemical test - Determination of water-soluble matter, water-soluble inorganic matter and water-soluble organic matter
Some standard content:
IC5 59. 140
Classification number, Y45
Alternative number: 15773-2005
Light Industry Standard of the People's Republic of China
QB/T 2721-2005
Recommended QB/T3812.16:1999
Chemical tests
Determination of water soluble matter, water soluble inorganic matter and wafer-soluble urganic mafter 2005-03-19
National Development and Reform Commission of the People's Republic of China implemented on 2005-09-01
QE/F2721-2005
This standard is a revision of QB/13812.16-1999 Determination of water-soluble matter, water-soluble inorganic matter and water-dispersed organic matter in polysaccharides. This standard is modified to adopt the International Union of Leather Chemists and Leather Technologists (IULTCS) standard ILC6 Determination of water soluble matter, water soluble inorganic matter and soluhle organic matter, and the standard is converted to ISO (150) No. 1Sn/DTS409: 2003 "Leather Chemical Tests—Determination of Water Soluble Matter, Water Soluble Inorganic Matter and Soluble Organic Matter" by the International Organization for Standardization. yolublerganicntatter) international standard. According to the actual situation of my country, this standard has made the following technical adjustments in the agricultural power C6 standard: - the explanatory content in 1 specification is transferred to 4 principle; the C standard cited in the "normative references" is rewritten as a reference to the relevant standards of my country; the order of 3 and 4 in the original standard is adjusted forward and backward: according to the domestic practice, the 7 test sample is divided into 7.1, 7.2, and 7.3 for easy use; the requirements for calculation results are added in the agreement; the order of 11 and 12 in the original standard is adjusted forward: the technical standard has also made the following editorial changes: the foreword of the UC standard is deleted; the word "TULTCS standard" is changed to "wood standard"; the decimal point "" is used instead of the "" as a decimal point, and this standard is consistent with QB Compared with GB/T3812.16-1999, the main changes are as follows: 2 "normative reference documents" are added:
"Sampling" is adjusted and detailed, and the standard is adopted by China Light Industry Federation. This standard is issued by China Leather Industry Standardization Technical Committee (SAC/TC252) and is under the jurisdiction of China National Leather Industry Standardization Technical Committee (SAC/TC252). The original unit of this standard is China Leather Industry Research Institute: The main drafter of this standard is Yue Liguo.
This standard was first issued in October 1984. The original national standard GB4689.16-1984 was converted into the light industry standard GB/T3812.16-1999 in April 1999. This is the first revision. From the date of implementation, this standard replaces the light industry standard QB/T3812.16-1999 "Determination of water-soluble organic matter, water-soluble inorganic matter, and water-soluble organic matter" issued by the State Bureau of Light Industry. Specification
Determination of water-soluble matter, water-soluble inorganic matter and water-soluble organic matter in leather chemical tests
This standard specifies the determination method of water-soluble matter, water-soluble inorganic matter and water-soluble organic matter in leather. The standard is applicable to all types of leather.
2 Normative references
QB/T 27212005
The following documents become the terms of this standard through reference in this standard. For the referenced documents with sufficient dates, all subsequent amendments (excluding revisions) or revisions are not applicable to this standard. However, the parties who reach an agreement based on this standard are encouraged to use the latest versions of these documents: For the referenced documents without dates, the latest versions are applicable to this standard. GH/T6682-192 Specifications and test methods for laboratory water QB/T2706-200S Sampling location for chemical, physical, mechanical and color flatness tests ([S0241R:2002, MDD)) QB/T2707-2005 Preparation and flow of single physical and mechanical test samples (1S02419:2002, MOD) 5 Preparation of chemical test samples (ISO4044:1977, MOD3 QB/T 2716-2005
5 Determination of chemical test samples (TSO404B:1977, MOD) QB/T 2718-2005 2005
3 Terms and Definitions
The following terms and definitions apply to this standard. 3.1
Water-soluble matter
Substances dissolved from leather into water under the conditions specified in this method. These substances are mainly organic dissolving agents, inorganic dissolving agents and mineral salts.
Water-soluble inorganic matter
Sulfate-soluble components of the water-soluble matter prepared by this method. 3. 3
Water-soluble organic matter
Water-soluble organic matter content is the difference between inorganic matter content. 4 Principle
The prepared sample is extracted with water under specified conditions. After the extract is hydrated, it is subjected to operation at a temperature of (10-2)°C to determine the water-soluble organic matter content. The residue is then subjected to sulfhydrylation and oxidization at a temperature of 10°C to determine the water-soluble organic matter content. The water-soluble organic matter content is the difference between the original organic matter content and the water-soluble organic matter content. The result obtained from the analysis depends on the following variables: the degree of preparation:
extraction temperature:
extraction time,
the ratio of water to water.
QB/I 27212005
In order to obtain the comparative results, the following conditions should be strictly followed. In all cases, the ammonium salt in the concentrated solution is part of the aqueous solution. When the ammonium salt is heated, it is decomposed and therefore is not included in the calculation of the amount of aqueous solution. If the concentration of the ammonium salt is to be determined, it can be dissolved in the concentrated solution alone. 5 Reagents and materialswwW.bzxz.Net
5.1 Sulfuric acid (1 mol/L
5.2 Water or deionized water, in accordance with the provisions of grade II water in CIB/T65N2-1992 8 Filling weight
6.1 Flask, 50mL.
6.2, 50mL.
8.a Pipette, 50L
6.4 Flat bottom outlet, not available, platinum or sealed, 5)m. 6.5 Plate full (50±10)1/.
6.6 Thermometer, 0~50'C
7 Dosing
6.8 Water or water bath.
6.9 Drying: can maintain a temperature of (102±2, 6.10 Furnace, keep the temperature close to 70U℃, but not more than 700! 1 See 9.4 Desiccator.
6.12 Most of the time, especially accurate to 001
Sampling and sample preparation
7.1 Sampling
According to the provisions of Q/270%-2005. If it is not possible to take samples from the standard parts (such as directly from shoes or clothing), please record the sampling details in the inspection report. 2 Preparation of samples According to the provisions of QL/F2716-2005, 7.3 Air conditioning of samples Before the inspection, follow the provisions of QR/T2707-2005. Procedure B Weigh about 10g of the sample and steam it according to the provisions of QT/T2718-2005. Take the sample and dry it, and then perform a lubrication test according to the provisions of QR/T2707-2005. The sample that has been air conditioned can also be recorded as 5: This quality is recorded. Into a 500mL flask (6.1), add 250mL of water at a temperature of (22.5±2.5), filter (6.5) 1. Take as needed, fill with a frequency of (5010)/m, at (22.512.5>℃ temperature for 2h (see 9.1) more than the new film level (6.7>) in the end of the extraction droplet, until about liquid is made. Aspirate the initial 50mL, and then aspirate 50% of the subsequent shallow liquid, and determine the water-soluble organic matter and water-soluble inorganic matter (see 42 and 9.3). BT water-soluble
Use a pipette (6.3) to draw 50.0mL of the filtrate to ensure that it has been consumed (.1%). Heat at 700*: and cool in a desiccator. After evaporation, accurately weigh. (6.4) in water (6.%)-cooled, filtered and evaporated. The residue was dried in an oven (6.9) at 102 °C for 25 min, then cooled in a vessel at 4 °C, and evaporated in a small vessel for 1 min. After weighing, re-weighing, cooling and weighing, the reduction of the particle size did not exceed 2 mg: or when the dry medium reached 8 h, the final original amount was recorded.
8.2 Water-soluble inorganic substances
In the evaporator (6.), separate the carbon residue obtained in 8.1 thoroughly with sufficient sulphuric acid (1m/s) (see 9.2). Add slowly under fire until the trioxide smoke is clear: do not heat up, and steam until it is red hot. Transfer to the furnace (6.10) and heat at 70)℃ for 15m (9.1). Cool in a desiccator as quickly as possible: sulphurize, heat, cool as needed, and the residue will be separated.
9 Operating precautions
9.1 If the humidity in the laboratory cannot be maintained at the specified level <22.5±2)℃, it is recommended to use a holding tank with a volume of 650ml--75mT. The temperature range is 0.5°C. 9.2 Water-soluble substances can be determined separately. For the determination of water-soluble substances, place 50 μL of the filtrate in a heated evaporator, quartz, silver or other evaporator and evaporate it at a temperature of (102 ± 2°C). For the determination of water-soluble substances, add 8.2 and place another 50 μL of the filtrate in a heated evaporator, calciner or other evaporator and evaporate it. 9.3 For the determination of water-soluble substances, place 50 μL of the filtrate in a heated evaporator, calciner or other evaporator and evaporate it at a temperature of (102 ± 2°C). At least 2.0% of the fur mass, it is recommended to use 100mL to 200mL of filtrate. When the viscosity is less than 1%. Filter 100 or 200:
9.4 When the humidity exceeds 700, there may be a base inorganic cover, resulting in the loss of the quality of the residue. Therefore, the temperature of the support plan can not exceed 700%: the result is expressed in 10% by mass. The water drop is expressed in mass fraction and the number is expressed in %, calculated by formula (): 2 = m × 100
Test center
Water content,:
The average starting quality of the sample after air conditioning and lipid extraction, once the position is the study (): m
, the mass of the residue is shown, the total is grams (g) water-soluble inorganic matter 7, calculated as mass fraction. The number is expressed in%. According to formula (2): n-=x10
Water-soluble inorganic matter content,:
After air conditioning and Farahti test details, the center is the mass of the residue after magnetic acidification, the position is grams! Water content Owa, calculated as mass fraction, the number is expressed, according to formula (3): Ow =Yue -fws
Results reserved: Decimal
Repeatability
The results of two tests are not guaranteed by the original tester. (
QB/T2721-2005
Test report
The test report should contain the following contents
Standard number:
Sample name, number, type:
Detailed information of the sample, and the situation that is inconsistent with QB/12706-2005: Test conditions (standard gas content: 20% gas/65% or 23% gas/50) Test results:
Any special conditions that may affect the test results: Differences between actual operations and this standard.
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