QB/T 2470-2000 General test methods for cosmetics Preparation of standard solutions for titration analysis (volumetric analysis)

This standard specifies the preparation and calibration methods of standard titration solutions for titration analysis (volumetric analysis). This standard is applicable to the preparation of solutions with accurate concentrations and is used for cosmetic quality analysis. QB/T 2470-2000 General test methods for cosmetics Preparation of standard solutions for titration analysis (volumetric analysis) QB/T2470-2000 Standard download decompression password: www.bzxz.net

QB/T 2470 --- 2000
This standard is formulated with reference to GB/T601-1988 "Chemical Reagents
Preparation of Standard Solutions for Titration Analysis (Volumetric Analysis)". This standard specifies the calibration method of standard three and two, and is applicable to the quality analysis of the cosmetics industry. This standard is proposed by the Industry Management Department of the State Bureau of Light Industry. This standard is under the jurisdiction of the National Cosmetics Standardization Center. The drafting unit of this standard: Shanghai Daily Chemical Industry Research Institute. The main drafters of this standard: Xi Wanling and Hu Yin. 111
1 Scope
Light Industry Industry Standards of the People's Republic of China
General Test Methods for Cosmetics
Preparation of Standard Solutions for Titration Analysis (Volumetric Analysis) This standard specifies the preparation and calibration method of standard titration solutions for titration analysis (volumetric analysis). This standard is applicable to the preparation of solutions with accurate concentrations and is used in the quality analysis of cosmetics. 2 Referenced standards
QB/T2470—2000
The clauses contained in the following standards constitute the clauses of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T601-1988 Preparation of standard solutions for titration analysis (volume analysis) of chemical reagents GB/T5173-1995 Determination of anionic active substances in surfactants and detergents Direct two-phase titration method GB/T6682-1992 Specifications and test methods for water used in analytical laboratories 3 General provisions
3.1 The water used in this standard shall comply with the specifications of grade 3 water in GB/T 6682. 3.2 The purity of the reagents used in this standard shall be above analytical purity. 3.3 The reference reagents used in calibration in this standard are reference reagents for volumetric analysis. 3.4 The magnetic code, burette, volumetric flask and pipette of the analytical balance used in the work shall be calibrated regularly. 3.5 The "calibration" of this standard stipulates that two people shall perform three calibrations and two calibrations, and the ratio of the range of the results to the average value shall not be greater than 0.3%. The result is the average value. The concentration value is taken to four significant figures.
3.6 The standard titration solution used in titration analysis (volume analysis) shall not be stored for more than three months at room temperature. 4 Preparation and calibration of standard titration solution
4.1 Preparation
4.1.1 Preparation of 0.1mol/L silver nitrate
Weigh 17.5g of silver nitrate, dissolve it in 1000mlL water, and spread it evenly. The solution is stored in a brown bottle. 4.1. Preparation of 25% potassium chromate
Weigh 5g of potassium chromate, dissolve it in distilled water and dilute it to 100mL. 4.2 Calibration
Weigh 0.2 g of standard sodium chloride burned to constant weight at 500C~600℃, accurate to 0.0001 g, dissolve it in 50 mL of distilled water in a 250 mL conical flask, add 1 mL of 5% potassium chromate as an indicator, and titrate with the prepared silver nitrate solution until a brick-red silver chromate precipitate is formed.
The concentration of the standard silver nitrate titration solution is calculated according to formula (1): c(AgNO,) -
Approved by the State Bureau of Light Industry on March 30, 2000
VX 0. 05844
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Implementation on August 1, 2000
In the formula: c(AgNO,)
QB/T2470--2000
The molar concentration of the standard silver nitrate titration solution, mol/LThe mass of sodium chloride in g;
The amount of silver nitrate solution used, mL
The mass of sodium oxide in grams equivalent to 1.00mL of the standard silver nitrate titration solution c(AgNO,)-1.000mol/L. bzxz.net
4.3 The preparation and calibration of 0.1mol/L sodium hydroxide standard titration solution shall be in accordance with the provisions of 4.1 of GB/T601~-1988. 4.4 The preparation and titration of 0.1mol/L hydrochloric acid standard titration solution shall be in accordance with the provisions of 4.2 of GB/T601-1988. 4.5 The preparation and calibration of 0.1mol/L sulfuric acid standard titration solution
shall be in accordance with the provisions of 4.3 of GB/T601-1988. 4.6 The preparation and calibration of 0.1mol/L sodium thiosulfate standard titration solution shall be in accordance with the provisions of 4.6 of GB/T601-1988. 4.7 The preparation and calibration of 0.1mol/L iodine standard titration solution
shall be in accordance with the provisions of 4.9 of GB/T601-1988. 4.8 The preparation and calibration of 0.1 mol/L potassium permanganate standard titration solution shall be in accordance with the provisions of 4.12 of GB/T 601-1988. 4.9 The preparation and calibration of 0.004 mol/L chlorinated potassium permanganate standard titration solution shall be in accordance with the provisions of GB/T 5173. 116
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