GB/T 35862-2018 English PDF (GBT35862-2018)

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GB/T 35862-2018: Surface active agents -- Determination of volatile organic compounds residues -- Headspace gas chromatography-mass spectrometry (GC-MS)
GB/T 35862-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.40
G 72
Surface active agents - Determination of volatile
organic compounds residues - Headspace gas
chromatography-mass spectrometry (GC-MS)
ISSUED ON. FEBRUARY 06, 2018
IMPLEMENTED ON. SEPTEMBER 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 4 
4 Principle ... 4 
5 Reagents ... 5 
6 Apparatus ... 5 
7 Preparation of standard solution ... 6 
8 Sample preparation ... 6 
9 Procedures ... 7 
10 Result expression ... 7 
11 Precision ... 8 
12 Detection limit ... 8 
13 Test report ... 8 
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard was proposed by China Petroleum and Chemical Industry
Federation.
This Standard shall be under the jurisdiction of Subcommittee on (Special)
Surfactant of National Technical Committee on Chemicals of Standardization
Administration of China (SAC/TC 63/SC 8).
The drafting organizations of this Standard. Shanghai Tianxiang Quality
Technology Service Co., Ltd., Zhejiang Real Madrid Technology Co., Ltd.
Main drafters of this Standard. Ning Qiaoyu, Ling Lijun, Xie Xueqin, Zhang
Jingjie, Huang Sheng, Tang Fuwei, Xia Yichu.
Surface active agents - Determination of volatile
organic compounds residues - Headspace gas
chromatography-mass spectrometry (GC-MS)
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.
8.3 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).