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GB 31604.37-2016 (GB31604.37-2016)

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GB 31604.37-2016English70 Add to Cart 0--10 minutes. Auto-delivery. Food contact materials for export -- Polymers -- Determination of triethylamine and tributylamine in polycarbonate resin and its products -- Gas chromatography GB 31604.37-2016 Valid GB 31604.37-2016


GB 31604.37-2016: PDF in English
GB 31604.37-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National Food Safety Standard –
Food Contact Materials and Articles –
Determination of Triethylamine and Tributylamine
ISSUED ON. OCTOBER 19, 2016
IMPLEMENTED ON. APRIL 19, 2017
Issued by. National Health and Family Planning Commission of the
People's Republic of China
Table of Contents
Foreword . 3 
1 Scope .. 4 
2 Principle.. 4 
3 Reagents and materials .. 4 
4 Instruments and equipment . 5 
5 Analysis steps . 5 
6 Expression of analysis results .. 7 
7 Precision. 7 
8 Other . 7 
Annex A Gas chromatogram of triethylamine and tributylamine . 8 
National Food Safety Standard –
Food Contact Materials and Articles –
Determination of Triethylamine and Tributylamine
1 Scope
This Standard specifies the determination method of triethylamine and
tributylamine by gas chromatography in food contact materials and articles.
This Standard is applicable to the determination of triethylamine and
tributylamine in polycarbonate food contact materials and articles.
2 Principle
After the sample is dissolved in dichloromethane, acetone shall be added to
precipitate the polymer resin. Triethylamine and tri-n-butylamine in solution are
concentrated and weighed, then measured by gas chromatography, and
quantified by external standard method.
3 Reagents and materials
Unless otherwise stated, the reagents used in this method are all analytically
pure. Plastic containers and transfer equipment shall be avoided during the test.
3.1 Reagents
3.1.1 Dichloromethane (CH2Cl2).
3.1.2 Acetone (C3H6O).
3.2 Standard product
3.2.1 Triethylamine (C6H15N, CAS No.. 121-44-8). a standard substance with
a purity of ≥99% or certified by the state and granted with a standard substance
certificate.
3.2.2 Tributylamine (C12H27N, CAS No.. 102-82-9). a standard substance
with a purity of ≥99% or certified by the state and granted with a standard
substance certificate.
conical flask. After the addition, shake the bottle solution. Centrifuge 10 min.
Take the supernatant and evaporate to a concentration of nearly 1 mL.
Completely transfer the concentrate to a plugged centrifuge tube. Dilute with
dichloromethane and set volume to 2.0 mL. Obtain the sample solution for the
gas chromatography determination.
NOTE 1. The solution centrifugation can be performed in several times. The supernatant after
centrifugation must be merged.
NOTE 2. If there is a small amount of turbidity in the sample solution, it can be filtered by a
needle-type organic phase filter and then measured by gas chromatography.
5.3 Blank test
Except that the sample is not added, use the same analysis steps, reagents
and dosage same as in 5.2 for parallel operation.
5.4 Gas chromatography reference conditions
5.4.1 Chromatographic column. ZB-5 quartz capillary column, column
length of 30m, inner diameter of 0.32mm, film thickness of 5μm, or the
equivalent.
5.4.2 Column temperature. initial temperature of 40°C, hold 5min; then
increase at 20°C/min to 250°C for 5min.
5.4.3 Inlet temperature. 200°C.
5.4.4 Detector temperature. 250°C.
5.4.5 Carrier gas. nitrogen (purity ≥99.999%), flow of 1.0 mL/min.
5.4.6 Detector hydrogen flow rate. 3 mL/min.
5.4.7 Detector air flow. 60 mL/min.
5.4.8 Injection volume. 1 μL.
5.4.9 Injection method. split-less injection.
5.5 Making of standard working curve
Inspect the standard working solution according to the chromatographic
conditions listed in 5.4. Take the concentration of triethylamine and
tributylamine (mg/L) in the standard working solution as the abscissa, the
corresponding chromatographic peak area as the ordinate, perform the linear
regression to draw the standard working curve.
5.6 Sample solution determination
......
(Above excerpt was released on 2018-04-23, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GB31604.37-2016