GB 5009.34-2022 PDF English
US$215.00 · In stock · Download in 9 secondsGB 5009.34-2022: National food safety standard - Determination of sulfur dioxide in foods Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB 5009.34: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 5009.34-2022 | English | 215 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
National food safety standard - Determination of sulfur dioxide in foods
| Valid |
| GB 5009.34-2016 | English | 70 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
National Food Safety Standard -- Determination of sulfur dioxide in food stuffs
| Obsolete |
| GB/T 5009.34-2003 | English | 70 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Determination of sulphite in foods
| Obsolete |
| GB/T 5009.34-1996 | English | 199 |
Add to Cart
|
2 days
|
Method for determination of sulphite in foods
| Obsolete |
| GB 5009.34-1985 | English | 199 |
Add to Cart
|
2 days
|
Method for determination of sulphite in foods
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB 5009.34-2022
GB 5009.34-2022: National food safety standard - Determination of sulfur dioxide in foods---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/GB5009.34-2022
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National food safety standard - Determination of sulfur
dioxide in foods
Issued on. JUNE 30, 2022
Implemented on. DECEMBER 30, 2022
Issued by. National Health Commission of the People's Republic of China;
Standardization Administration 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 Presentation of analysis results... 7
7 Precision... 7
8 Detection limit and quantification limit... 7
9 Principle... 8
10 Reagents and materials... 8
11 Instruments and equipment... 9
12 Analysis steps... 9
13 Presentation of analysis results... 10
14 Precision... 11
15 Detection limit and quantification limit... 11
16 Principle... 11
17 Reagents and materials... 12
18 Instruments and equipment... 12
19 Analysis steps... 12
20 Presentation of analysis results... 14
21 Precision... 14
22 Detection limit and quantification limit... 14
Annex A Schematic diagram of distillation device for acid-base titration... 16
Annex B Schematic diagram of steam distillation device... 17
Annex C Typical spectrum of sulfur dioxide standard working solution... 18
Foreword
This document replaces GB 5009.34-2016 "National Food Safety Standard -
Determination of sulfur dioxide in food stuffs".
Compared with GB 5009.34-2016, the main changes in this document are as follows.
- Modify the original titration method to acid-base titration method.
- Add spectrophotometry, ion chromatography.
National food safety standard - Determination of sulfur
dioxide in foods
1 Scope
This document specifies the determination method of sulfur dioxide in foods.
Method One. Acid-base titration method is applicable to the determination of sulfur
dioxide in foods. Method Two is Spectrophotometry. Direct extraction method is
suitable for the determination of sulfur dioxide in white sugar and white sugar products,
starch and starch products and raw wet flour products. Nitrogen-filled steam extraction
method is suitable for the determination of sulfur dioxide in wine and brown sugar.
Method Three. Ion chromatography is applicable to the determination of sulfur dioxide
in foods.
Method One -- Acid-base titration method
2 Principle
Use nitrogen-filled steaming method to treat the specimen. After the specimen is
acidified, under heating conditions, a series of substances such as sulfites release sulfur
dioxide. Use hydrogen peroxide solution to absorb the distillate. Sulfur dioxide is
dissolved in the absorption liquid and oxidized to form sulfuric acid. Use standard
sodium hydroxide solution to titrate. Calculate the content of sulfur dioxide in the
specimen according to the consumption of sodium hydroxide standard solution.
3 Reagents and materials
Unless otherwise stated, the reagents used in this method are all analytically pure; the
water is grade three water specified in GB/T 6682.
3.1 Reagents
3.1.1 Hydrogen peroxide (H2O2). 30%.
3.1.2 Absolute ethanol (C2H5OH).
3.1.3 Sodium Hydroxide (NaOH).
3.1.4 Methyl red (C15H15N3O2).
3.1.5 Hydrochloric acid (HCl) (ρ20=1.19g/mL).
3.1.6 Nitrogen (purity >99.9%).
3.2 Reagent preparation
3.2.1 Hydrogen peroxide solution (3%). Measure 100mL of hydrogen peroxide of
which its mass fraction is 30%. Add water to dilute to 1000mL. Prepare it when it is
needed.
3.2.2 Hydrochloric acid solution (6mol/L). Measure 50mL of hydrochloric acid
(ρ20=l.19g/mL). Pour slowly into 50mL of water. Stir while pouring.
3.2.3 Methyl red ethanol solution indicator (2.5g/L). Weigh 0.25g of methyl red
indicator. Dissolve in 100mL of absolute ethanol.
3.3 Preparation of standard solution
4 Instruments and equipment
4.1 Glass nitrogen-filled steamer. 500mL or 1000mL. Equip it with electric heating
jacket, nitrogen source and gas flow meter, or equivalent steaming equipment. See
Annex A for the schematic diagram of the device.
4.2 Electronic balance. Resolution is 0.01g.
4.3 10mL semi-micro-burettes and 25mL burettes.
4.4 Grinder.
4.5 Tissue masher.
5 Analysis steps
5.1 Specimen pretreatment
5.1.1 Liquid specimen
Take specimens of beer, wine, fruit wine, other fermented wine, prepared wine, and
beverages. The sampling volume shall be greater than 1L. For packaging specimens
such as bagged specimens and bottled specimens, at least 3 packages (same batch or
number) shall be collected. Put all liquids in one container. Mix well. Seal and mark for
testing.
5.1.2 Solid specimen
Take specimens of grain processed products, solid condiments, biscuits, potato products,
candy products (including chocolate and products), substitute tea, pickled vegetables,
dried vegetable products, edible mushroom products, other vegetable products, candied
fruit, dried fruit products, roasted seeds and nuts and nut products (baked, fried, other),
sugar, dried aquatic products, cooked animal aquatic products, edible starch, starch
products, starch sugar, non-fermented soy products, vegetables, fruits, seawater
products, raw and dried nuts and seeds.
5.1.3 Semi-fluid specimen
For packaging specimens such as bagged specimens and bottled specimens, at least 3
packages (same lot or number) need to be collected.
5.2 Specimen determination
Take 20g~100g of solid or semi-fluid specimen (to the nearest of 0.01g; the sampling
amount depends on the content). Take 20mL(g)~200mL(g) of liquid specimen. Place
the weighed specimen in the round bottom flask A in Figure A.1.Add 200mL~500mL
of water. Install the device. Turn on the switch of the reflux condenser to supply water
(condensate temperature < 15°C). Place the glass tube connected to the port E at the
upper end of the condenser tube at the bottom of the 100mL conical flask. Add 50mL
of 3% hydrogen peroxide solution to the conical flask as the absorption solution (the
end of the glass tube shall be below the liquid level of the absorption solution). Add 3
drops of 2.5g/L methyl red ethanol solution indicator to the absorption solution.
6 Presentation of analysis results
The content of sulfur dioxide in the specimen is calculated according to formula (1).
7 Precision
The absolute difference between the results of two independent determinations obtained
under repeatability conditions shall not exceed 10% of the arithmetic mean.
8 Detection limit and quantification limit
When using 0.01mol/L sodium hydroxide titrant, when the solid or semi-fluid sampling
weight is 35g, the detection limit is 1mg/kg, the quantification limit is 10mg/kg.
9 Principle
The sample is directly soaked in methyl acetate buffer absorbent or nitrogen-filling with
acid and steamed-released sulfur dioxide is absorbed by the formaldehyde solution.
Generate stable hydroxymethanesulfonic acid addition compound.
10 Reagents and materials
Unless otherwise stated, the reagents used in this method are all analytically pure, and
the water is grade three water specified in GB/T 6682.
10.1 Reagents
10.1.1 Ammonium sulfamate (H6N2O3S).
10.1.2 Disodium EDTA (C10H14N2Na2O8).
10.1.3 Formaldehyde (CH2O). 36%~38%; there shall be no polymer (no precipitation
and no separation of the solution).
10.1.4 Potassium hydrogen phthalate (KHC8H4O4).
10.2 Reagent preparation
10.2.1 Sodium hydroxide solution (1.5mol/L). Weigh 6.0g of NaOH (3.1.3). Dissolve
in water and dilute to 100mL.
10.2.2 Disodium EDTA solution (0.05mol/L). Weigh 1.86g of disodium
ethylenediaminetetraacetate (abbreviated as EDTA-2Na). Dissolve in water and dilute
to 100mL.
10.2.5 Pararosaniline hydrochloride solution (0.5g/L). Measure 25.0mL of 2%
pararosaniline hydrochloride solution. Respectively add 30mL of phosphoric acid and
12mL of hydrochloric acid (3.1.5). Use water to dilute to 100mL. Shake well. Place for
24h for future use (store in an airtight seal away from light).
10.2.6 Ammonium sulfamate solution (3g/L). Weigh 0.30g of ammonium sulfamate
(H6N2O3S). Dissolve in water and dilute to 100mL.
10.3 Standard product
Sulfur dioxide standard solution (100μg/mL). With national certification and granted a
standard substance certificate.
10.4 Preparation of standard solution
Sulfur dioxide standard solution (10μg/mL). Accurately pipette 5.0mL of sulfur dioxide
standard solution (100μg/mL). Use formaldehyde buffer absorption solution to set
volume to 50mL. Prepare it when it is needed.
11 Instruments and equipment
11.1 Glass nitrogen-filled distiller. 500mL or 1000mL, or equivalent steaming
equipment. See Annex A for the schematic diagram of the device.
11.2 UV-visible spectrophotometer.
12 Analysis steps
12.1 Specimen preparation
Same with 5.1.
12.2 Specimen processing
12.2.1 Direct extraction method
Weigh about 10g of solid specimen (to the nearest of 0.01g). Add 100mL of
formaldehyde buffered absorption solution. Vibrate and soak for 2h. Filter. Take the
filtrate for testing. Conduct blank test at the same time.
12.3 Preparation of standard curve
Respectively and accurately measure 0.00mL, 0.20mL, 0.50mL, 1.00mL, 2.00mL,
3.00mL of sulfur dioxide standard solution (equivalent to 0.0μg, 2.0μg, 5.0μg, 10.0μg,
20.0μg, 30.0μg sulfur dioxide).
12.4 Determination of specimen solution
According to the sulfur dioxide content in the specimen, pipette 0.50mL~10.00mL of
specimen solution. Placed in a 25mL stoppered test tube. Follow the operation of 12.3
"Add formaldehyde buffer absorption solution to 10.00mL...". Conduct the blank test
at the same time.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
Tips & Frequently Asked QuestionsQuestion 1: How long will the true-PDF of English version of GB 5009.34-2022 be delivered?Answer: The full copy PDF of English version of GB 5009.34-2022 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice. Question 2: Can I share the purchased PDF of GB 5009.34-2022_English with my colleagues?Answer: Yes. The purchased PDF of GB 5009.34-2022_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB 5009.34-2022 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds. Question 5: Should I purchase the latest version GB 5009.34-2022?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB 5009.34-2022 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. How to buy and download a true PDF of English version of GB 5009.34-2022?A step-by-step guide to download PDF of GB 5009.34-2022_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).
Step 2: Search keyword "GB 5009.34-2022".
Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart.
Step 4: Select payment option (Via payment agents Stripe or PayPal).
Step 5: Customize Tax Invoice -- Fill up your email etc.
Step 6: Click "Checkout".
Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively.
Step 8: Optional -- Go to download PDF.
Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice.
See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9
|