This standard specifies the determination method of pH and dilution difference of leather water extract. This standard is applicable to all types of leather. QB/T 2724-2005 Determination of pH of leather chemical test QB/T2724-2005 Standard download decompression password: www.bzxz.net

ICs 59.140
Classification number: Y45
Rate number: 15776-2005
Light Industry Standard of the People's Republic of China
QB/T2724--2005
QB/T3812.191999
Leather-Chemical testsDeterminatinn of pH(IS0 4045: 1977, Leather--Determination of pH, MOD)2005-03-19 Issued
National Development and Reform Commission of the People's Republic of China Implemented on 2005-09-01
This standard is a revision of QB/3R12.191999 Determination of Skin Single 13 QB/T2T24—2005
This standard adopts 1S04045:1977 Skin Section H Determination 1Cather—1Jelinaria International Certification This standard proposes the following technical specifications based on the actual situation in my country, and adopts 1S04045:1977: "Regulatory Documents" will be used to collect the relevant standards of the country: Add relevant pressure standards:
51 Add reference standard provisions for water;
According to Chinese practice, the test sample part is divided into 1, 2, and 3. For pressure: Add "indication of the results";
This standard also makes the following editorial modifications: Delete the prefix of ISO standard; Change the word "international standard" to "non-standard"; Use "decimal point" instead of "certificate number"; The main changes between this standard and QBT3812.19-1999 are as follows: Add 2 "normative reference documents"
Add "equipment of test sample" || tt||Added 9 "results of clothing not".
Standard China Light Industry Federation
This standard is issued by the National Standardization Technical Committee (S2): This standard was drafted by: China Light Industry Research Institute. The main drafter of the standard is Yue Wenguo.
This global standard was first issued in October 1984 as the original user standard G4680.19-1084, and in 19994 it was changed to the existing standard 0B/T3812.19-1999, and the 4th order is calculated. This standard is the first time to replace the original national rate! The industry has issued the flash light industry standard QB/3812.1 9-1 Leather market, H measurement
1 ScopewwW.bzxz.Net
Determination of pH of leather chemical test
This standard specifies the determination method of H concentration of leather, and this standard is applicable to the leather level of certain types. 2 Normative references
QB/T27242005
The clauses in the following documents are changed into the clauses of this standard through the reference of this standard. Except for the use of the date indicated, all subsequent amendments (excluding errors or revisions) are not applicable to the non-standard version, however, the parties to the standard shall study whether the latest versions of these documents can be used. This is an unspecified document. The latest version applies to this standard. GB/B2-1992 Specifications and test methods for water content in analytical tests QB/T2706-2005 Leather chemical test samples (ISO241B:2002MOD QB/T2716-2005 Preparation of fur chemical test samples (ISO4044:1977, MOD) 3 Terms and definitions
The following terms and definitions apply: non-standard. 3.1
The difference between the pH of the diluted culture solution and the pH after the solution is diluted 10 times. This is a method of measuring the limit and strength, and its value will not exceed 1: when the free ester contains free elastin (or free high-strength alkali), its dilution value is between 1.7 and 1. The ionization of aldehydes and weak bases increases with the dilution of the solution: therefore, the release difference can only be used as a criterion for the presence of free acids or free alkalis in the aqueous extract solution with a pH of 4.0 or 5.0. 4 Principle
The aqueous extract is prepared with a leather tester and the pH of the solution is determined with a pH meter. 5 Reagents and materials
5.1 Distilled water or deionized water, in accordance with the provisions of GE66-21992 for grade 1 water, pH 6-7, conductivity not greater than 2 x 1*5/m at 20°C, stored in a slightly boiled low-alkalinity glass container. 5.2 Flushing solution, used to calibrate the electrode system, in order to use the standard buffer solution purchased. For cross-linking type flushing solutions, the flushing solution should be re-prepared every month. The storage time of graded flushing solutions depends on their composition and use, so they should be kept clean. Flow control.
Used buffer solution should be discarded.
6 Apparatus
6.1 According to the algae instrument, the full frequency is adjusted to (50 ± 10) r/min QR/T27242005
6.2 Digital J1 tooth, measuring cell country ~ 14H unit, graduation 0.05pH unit, electrode system, forehead with pulse wave exchange.
: The water bloom in the oil brain is relatively high and will be more polarized. In this case, the cotton can be removed after the film is removed. The dead net is placed in the port machine 1:! : Volume ratio technique-matching certificate reduction, flow main pole, thank the original external complete method. 6.3 Balance, confirm No. 30.0
64 Quality again instrument
6.4.11 [1 burning, 100mL, with a seal Bottle room. 6.4.2 Energy, m, 1 ml.
6.4.3 Calorimetry, 100 ml
6.4.4 Wavelength, ml.-
Note: The glass density is calculated by using the low-energy group of garbage. In the case of the test, use the micro-channel to do the test questions, with: and sequence before the test on the quality of 5.1 good use of the method, so that the state to bring code
7 with 7.1 Sampling
Follow the provisions of QH 2706-2005. If the sampling is not in accordance with the standards (such as from the community, the number of reports), the test should be recorded in the test.
7.2 Preparation of test samples
Follow the provisions of CB2716-205
8 Procedure
8.1 Weigh the sample: 510.1/g
8.2 Preparation of the sample
Put the sample in a flask (0.4.1) and add (10+1)mL of deionized water (5.1) at a temperature of (20°C) for 30s to fully wet the sample. After ignition, place the sample in a glass container (6.1) for 6h. Before the sample is taken, the sample is taken out of the filter. The sample is filtered out using a clean, non-adsorbent glass filter and filtered through a plastic glass filter to improve the sample quality. 8.3 Determination of the sample
3: The sample is soluble in water and has a low secretion rate. The sample is tested for its high conductivity. When the meter is set, the difference between the two positive and negative waves is within 0.02 units: 8.3.2 The sample solution (8.2) should be <20+1>. The meter (6.2) measures the H of the sample solution, and the actual number reaches the total set value, which is 0.05pI units. The number is read within 3060s after the electrode is immersed in the sample solution. 8.4 The difference between the residual
and the residual value of the diluted solution should be set as
. If it is lower than 4 or higher than -10, the residual value should be set as
. Use the reducing tube (6.4.) to transfer 10ml of the sample solution to the volumetric measuring instrument (6.2.3), add lightly until the hole is engraved, rinse the electrode with 20% diluted solution, and measure the H according to 8.3. 9 The result is expressed as the average value of the sample p, which is lower than 4 and higher than 0.05, and the sample is recorded.
Test report
The test report shall include the following contents:
This standard number:
Sample name, number, type:
Detailed information of the sample; Any discrepancy between the sample result and QB/270G-2005 (test result, difference);
R/T2724-2005
Record any inconsistent pH reading of the sample solution (resistance or dilution difference that cannot be clearly recorded); Any discrepancy between the actual work and this standard.
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