SN/T 2204-2015 PDF English
US$220.00 · In stock · Download in 9 secondsSN/T 2204-2015: Food contact materials - Wood products - Determination of pentachlorophenol in food simulants - Gas chromatography-mass spectrometry Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid SN/T 2204: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| SN/T 2204-2015 | English | 220 |
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Food contact materials - Wood products - Determination of pentachlorophenol in food simulants - Gas chromatography-mass spectrometry
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| SN/T 2204-2008 | English | 359 |
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Determination of pentachlorophenol by gas chromatography - mass spectrometry in the wooden category of food contact materials in food simulants
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SN/T 2204-2015: Food contact materials - Wood products - Determination of pentachlorophenol in food simulants - Gas chromatography-mass spectrometry
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/SNT2204-2015
SN
ENTRY-EXIT INSPECTION AND QUARANTINE INDUSTRY
Replacing SN/T 2204-2008
Food Contact Materials – Wood Products – Determination
of Pentachlorophenol in Food Simulants – Gas
Chromatography-Mass Spectrometry
Issued on: SEPTEMBER 2, 2015
Implemented on: APRIL 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative References... 4
3 Summary of Method... 4
4 Reagents and Materials... 5
5 Instruments... 6
6 Preparation and Treatment of Specimens... 6
7 Blank Test... 10
8 Calculation of Results... 10
9 Lower Limit of Determination... 11
10 Precision... 11
Appendix A (Informative) Selected Ion Chromatogram of Standard Working Solution,
Selected Ion Mass Spectrum of Acetylated Pentachlorophenol and Internal Standard
Aldrin... 12
Food Contact Materials – Wood Products – Determination
of Pentachlorophenol in Food Simulants – Gas
Chromatography-Mass Spectrometry
1 Scope
This Standard specifies the gas chromatography-mass spectrometry method for the
determination of the migration of pentachlorophenol in wood products of food contact materials
in six food simulants (water, 3% acetic acid solution, 10% ethanol solution, 20% ethanol
solution, 50% ethanol solution and 95% ethanol solution).
This Standard is applicable to the determination of the migration of pentachlorophenol in wood
products of food contact materials in six food simulants (water, 3% acetic acid solution, 10%
ethanol solution, 20% ethanol solution, 50% ethanol solution and 95% ethanol solution).
2 Normative References
The following documents are essential to the application of this Document. For the dated
documents, only the versions with the dates indicated are applicable to this Document; for the
undated documents, only the latest version (including all the amendments) is applicable to this
Document.
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 23296.1 Materials and articles in contact with food - Plastics substances subject to
limitation - Guide to test methods for the specific migration of substances from plastics to
foods
3 Summary of Method
The soaked food simulant of wood products was converted into potassium carbonate solution.
The soaked-out pentachlorophenol was acetylated with acetic anhydride and extracted with n-
hexane. The solution was concentrated and made constant volume with nitrogen blower; and
then determined by gas chromatography-mass spectrometry. Aldrin was used as internal
standard for quantification.
phase to a 10 mL centrifuge tube; accurately add 10 µL of 100 mg/L aldrin internal standard
solution (4.14) using a microinjection needle; shake well; mix well in a vortex mixer for 2 min;
and concentrate to 1.0 mL using a weak nitrogen stream. This solution is used for gas
chromatography-mass spectrometry confirmation and determination.
6.2.2 Pipette 100 mL of the 3% acetic acid solution [4.10 b)] treated according to 6.1 to a 250
mL separatory funnel; add 16 mL of potassium hydroxide solution (4.12) to adjust the solution
to near neutrality. Then add 1.60 g of anhydrous potassium carbonate (4.1); shake until the
potassium carbonate is completely dissolved. Add 2 mL of acetic anhydride (4.4) and shake for
2 min. Add 5 mL of n-hexane (4.6); shake for 2 min; stand for 5 min; and discard the lower
aqueous phase. Add 50 mL of sodium sulfate aqueous solution (4.13) to the upper n-hexane
phase; shake and wash once; stand for 5 min; and discard the lower aqueous phase. Transfer
the n-hexane phase to a 10 mL centrifuge tube; accurately add 10 µL of 100 mg/L aldrin internal
standard solution (4.14) using a microinjection needle; shake well and mix in a vortex mixer
for 2 min; and concentrate to 1.0 mL with a weak nitrogen flow. This solution is used for gas
chromatography-mass spectrometry confirmation and determination.
6.2.3 Pipette 100 mL of the 10% ethanol solution [4.10 c)] treated according to 6.1 to a 250 mL
separatory funnel; add 1.38 g of anhydrous potassium carbonate (4.1); shake to completely
dissolve the potassium carbonate. Add 2 mL of acetic anhydride (4.4) and shake for 2 min. Add
5 mL of n-hexane (4.6); shake for 2 min; stand for 5 min; and discard the lower aqueous phase.
Add 50 mL of sodium sulfate aqueous solution (4.13) to the upper n-hexane phase; shake and
rinse once; stand for 5 min; and discard the lower aqueous phase. Transfer the n-hexane phase
to a 10 mL centrifuge tube; accurately add 10 µL of 100 mg/L aldrin internal standard solution
(4.14) with a microinjection needle; shake well; mix well in a vortex mixer for 2 min; and
concentrate to 1.0 mL with a weak nitrogen flow. This solution is used for gas chromatography-
mass spectrometry confirmation and determination.
6.2.4 Pipette 100 mL of the 20% ethanol solution [4.10 d)] treated according to 6.1 to a 150 mL
round-bottom flask; and concentrate to about 80 mL using a rotary evaporator. Transfer the
solution in the round-bottom flask to a 250 mL separatory funnel; and then transfer the residue
in the round-bottom flask to the same separatory funnel with 20 mL of distilled water. Add 1.38
g of anhydrous potassium carbonate (4.1); and shake to dissolve the potassium carbonate
completely. Add 2 mL of acetic anhydride and shake for 2 min. Add 5 mL of n-hexane (4.6);
shake for 2 min; stand for 5 min; and discard the lower aqueous phase. Add 50 mL of sodium
sulfate aqueous solution (4.13) to the upper n-hexane phase; shake and rinse once; stand for 5
min; and discard the lower aqueous phase. Transfer the n-hexane phase to a 10 mL centrifuge
tube; accurately add 10 μL of 100 mg/L aldrin internal standard solution (4.14) using a
microinjection needle; shake well and mix in a vortex mixer for 2 min; concentrate to 1.0 mL
with a weak nitrogen stream. This solution is used for gas chromatography-mass spectrometry
confirmation and determination.
6.2.5 Pipette 100 mL of the 50% ethanol solution [4.10 e)] treated according to 6.1 to a 150 mL
round-bottom flask; concentrate to about 50 mL using a rotary evaporator; transfer the solution
in the round-bottom flask to a 250 mL separatory funnel; and then transfer the residue in the
round-bottom flask to the same separatory funnel with 50 mL of distilled water. Add 1.38 g of
anhydrous potassium carbonate (4.1); shake to completely dissolve the potassium carbonate.
Add 2 mL of acetic anhydride (4.4) and shake for 2 min. Add 5 mL of n-hexane (4.6); shake
for 2 min; stand for 5 min; and discard the lower aqueous phase. Add 50 mL of sodium sulfate
aqueous solution (4.13) to the upper n-hexane phase; shake and rinse once; stand for 5 min; and
discard the lower aqueous phase. Transfer the n-hexane phase to a 10 mL centrifuge tube;
accurately add 10 μL of 100 mg/L aldrin internal standard solution (4.14) with a microinjection
needle; shake well; mix well in a vortex mixer for 2 min; and concentrate to 1.0 mL with a weak
nitrogen flow. This solution is used for gas chromatography-mass spectrometry confirmation
and determination.
6.2.6 Pipette 100 mL of the 95% ethanol solution [4.10 f)] treated in accordance with 6.1 to a
150 mL round-bottom flask; concentrate to near dryness using a rotary evaporator; transfer the
residue in the round-bottom flask to a 250 mL separatory funnel using 100 mL of 0.1 mol/L
potassium carbonate solution (4.11) in three portions. Add 2 mL of acetic anhydride (4.4); and
shake for 2 min. Add 5 mL of n-hexane (4.6); shake for 2 min; stand for 5 min; and discard the
lower aqueous phase. Add 50 mL of sodium sulfate aqueous solution (4.13) to the upper n-
hexane phase; shake and rinse once; stand for 5 min; and discard the lower aqueous phase.
Transfer the n-hexane phase to a 10 mL centrifuge tube; accurately add 10 μL of 100 mg/L
aldrin internal standard solution (4.14) with a microinjection needle; shake well and mix in a
vortex mixer for 2 min; concentrate to 1.0 mL with a weak nitrogen flow. This solution is used
for gas chromatography-mass spectrometry confirmation and determination.
NOTE. Some samples will produce foam during the acetylation process. At this time, filter to remove
the foam and then add n-hexane for extraction. If there is still a small amount of foam in the n-hexane
phase, centrifuge for 2 min to separate the foam from the n-hexane; then transfer the n-hexane phase to
another 10 mL centrifuge tube and perform the subsequent test.
6.3 Preparation of standard stock solution
Accurately weigh 10 mg (accurate to 0.001 g) of pentachlorophenol standard product (4.8) into
a 100 mL volumetric flask; make constant volume with potassium carbonate solution (4.11) to
the scale; shake well; and store in a refrigerator at 4°C for later use.
6.4 Preparation of standard intermediate solution
Accurately weigh 1.0 mL of standard stock solution (6.3) into a 100 mL volumetric flask; make
constant volume with potassium carbonate solution (4.11) to the scale; shake well; and store in
a refrigerator at 4°C for later use.
6.5 Preparation of standard working solution
Accurately transfer 1.0 mL of standard intermediate solution (6.4) into a 250 mL separatory
funnel; dilute to 100 mL with the corresponding food simulant; and follow the corresponding
procedures in 6.2.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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