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GB/T 7917.4-1987 PDF English

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GB/T 7917.4-1987: Standard methods of Hygienic test for cosmetics. Methanol
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GB/T 7917.4-1987: Standard methods of Hygienic test for cosmetics. Methanol

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NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA UDC 668.58.543.062 GB 7917.4-87 Standard method of hygienic test for cosmetics - Methanol Issued on. MAY 28, 1987 Implemented on. OCTOBER 01, 1987 Issued by. Ministry of Health of the People's Republic of China

Table of Contents

1 Method summary... 3 2 Sample collection... 3 3 Reagents... 3 4 Instruments... 3 5 Analysis steps... 4 6 Calculation of analysis result... 5 Additional information... 6 Standard method of hygienic test for cosmetics - Methanol This Standard applies to the determination of methanol content in cosmetics that contain ethanol.

1 Method summary

Use gas chromatography to test and quantify the samples directly or after distillation.

2 Sample collection

See Chapter 2 of GB 7917.1-87, Standard methods of hygienic test for cosmetics - Mercury.

3 Reagents

3.1 Methanol (99.5%). analytical reagent. 3.2 Methanol-free ethanol. inject 1.0 µl into the chromatograph, there shall be no impurity peaks. 3.3 GDX-102 (60 ~ 80 mesh). gas chromatography reagent. 3.4 Methanol standard solution. take 2.5 ml of methanol and place it in a 100 ml volumetric flask that is filled with 95 ml of water in advance; then, add water to the mark; mix well and set aside.

4 Instruments

4.1 Gas chromatograph. it is equipped with hydrogen flame ionization detector. 4.2 Chromatographic column. glass column or stainless-steel column, whose specification is 2 m × Φ4 mm; it is filled with GDX-102 (60 ~ 80 mesh) supporter.

5 Analysis steps

5.1 Start the chromatograph and make necessary adjustments to achieve the best working conditions of the instrument. Chromatographic conditions are selected according to specific conditions; the reference conditions are. 5.2 Sample pretreatment. for liquid or low-viscosity samples, and when the methanol content is high, take 10 ml of sample and add methanol-free ethanol (3.2) to a total volume of 50 ml. If necessary, it can be filtered and used as a sample liquid. The floral water with low methanol content can also be directly measured without dilution. 5.3 Determination Take four 50 ml volumetric flasks; respectively inject 1.00, 2.00, 3.00, 4.00 ml of methanol standard solution (3.4); then, respectively add 30 ml of methanol- free ethanol; respectively add water to the mark; this standard sequence contains methanol of 0.05%, 0.10%, 0,15%, 0.20%.

6 Calculation of analysis result

Calculate the methanol concentration as follows. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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