GB/T 35862-2018Surface active agents—Determination of volatile organic compounds residues—Headspace gas chromatography-mass spectrometry (GC-MS) (English PDF)
表面活性剂 挥发性有机化合物残留量的测定 顶空气相色谱质谱(GC-MS)联用法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
February 6, 2018
Implementation date
September 1, 2018
Scope
GB/T 35862-2018 is the English-translated version of 表面活性剂 挥发性有机化合物残留量的测定 顶空气相色谱质谱(GC-MS)联用法.
GB/T 35862-2018 is the Chinese national test method for measuring how much residual volatile organic compound content remains in surfactants, using headspace gas chromatography-mass spectrometry.
A sample is sealed in a headspace vial, heated in the headspace sampler, and its volatile components are sent directly to the gas chromatograph, with the result for compounds boiling below 250°C calculated from the response factor of toluene.
The method sets out the reagents, apparatus, standard solutions and standard curve, sample preparation, instrument conditions, result expression, precision, detection limit and test report.
It applies to all kinds of surfactants and is intended for manufacturers and testing laboratories. GB/T 35862-2018 was issued on 6 February 2018 and has applied since 1 September 2018.
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Document preview — GB/T 35862-2018
National Standard of the People's Republic of China
- ICS
- 71.100.40
- Classification
- G 72
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope4
- 2 Normative references4
- 3 Terms and definitions4
- 4 Principle4
- 5 Reagents5
- 6 Apparatus5
- 7 Preparation of standard solution6
- 8 Sample preparation6
- 9 Procedures7
- 10 Result expression7
- 11 Precision8
- 12 Detection limit8
- 13 Test report8
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
1 Scope
This Standard specifies the method for determining the volatile residues of organic compounds in surfactants by headspace gas chromatography-mass spectrometry. This Standard is applicable to various surfactants.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 13173, Surface active agents - Detergents - Testing methods
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 Volatile organic compounds; VOCs
any organic compound having an initial boiling point lower than or equal to 250°C at a standard pressure of 101.3 kPa
4 Principle
The testing sample is placed in a headspace bottle and sealed. After heating in the headspace sampler for a certain period of time, the volatile components in the sample are directly introduced into the gas chromatograph for separation and detection. Calculate the concentration of organic compounds with a boiling point below 250°C by using the response coefficient of toluene.
8 Sample preparation
8.3 Preparation of standard curve
Prepare 6 headspace bottles. Add 1.00 mL of standard solution A, B, C, D, E to each of the 5 headspace bottles. Add 1.00 mL of marker working solution to the other headspace bottle. Add 1 mL of water separately. Immediately cover and seal. The toluene contents shall be 0.1 µg, 0.5 µg, 2.0 µg, 10 µg, and 20 µg, respectively.
9 Procedures
9.1 Testing conditions
The testing conditions shall meet the following requirements.
- Inlet temperature. 230°C;
- Carrier gas. helium, flow rate at 1 mL/min;
- Column temperature. temperature programmed, held at 50°C for 2 min, raised to 100°C at 12°C/min, then raised to 230°C at 35°C/min;
- Detector. MSD;
- Ionization mode. electron bombardment ionization (EI), ionization energy 70 eV;
- Scan mode. full scan;
- Headspace parameters. 80°C, balance for 40min, injection time is 1min, injection volume is 1mL.
9.2 Testing
Prepare samples and standard curves as described in 8.2, 8.3. Put the headspace vial into the headspace sampler. Analyze according to the chromatographic conditions given in 9.1. Scan to obtain a chromatogram and record the peak area of the compound peaking before the marker.
10 Result expression
10.1 Calculate the content of volatile organic compounds (i) peaking in the sample before the marker according to formula (1). […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
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