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GB 5009.182-2017 PDF English

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GB 5009.182-2017: National food safety standard - Determination of aluminum in foods
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GB 5009.182: Historical versions

Standard IDUSDBUY PDFDeliveryStandard Title (Description)Status
GB 5009.182-201770 Add to Cart Auto, 9 seconds. National food safety standard - Determination of aluminum in foods Valid
GB/T 5009.182-2003199 Add to Cart 2 days Determination of aluminium in flour products Obsolete

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GB 5009.190   GB/T 5009.19   GB/T 5009.18   GB 5009.183   

GB 5009.182-2017: National food safety standard - Determination of aluminum 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/GB5009.182-2017
GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA National food safety standard - Determination of aluminum in foods Issued on. APRIL 6, 2017 Implemented on. OCTOBER 6, 2017 Issued by. National Health and Family Planning Commission of the PRC; China Food and Drug Administration.

Table of Contents

Foreword... 3 1 Scope... 4 2 Principles... 4 3 Reagents and materials... 4 4 Instrument and equipment... 6 5 Analytical procedures... 7 6 Analysis results expression... 8 7 Precision... 8 8 Others... 8 9 Principles... 9 10 Reagents and materials... 9 11 Instrument and equipment... 10 12 Analytical procedures... 10 13 Analysis results expression... 13 14 Precision... 13 15 Others... 13 Appendix A Microwave digestion temperature-rise program... 14 Appendix B Pressure-tank digestion reference heating conditions... 15

Foreword

For the determination method of aluminum, this standard replaces GB/T 5009.182-2003 “Determination of aluminum in flour products”, GB/T 23374- 2009 “Determination of aluminium in foods - Inductively coupled plasma mass spectrometry”, GB/T 18932.11-2002 “Method for the determination of potassium, phosphorus, iron, calcium, zinc, aluminium, sodium, magnesium, boron, manganese, copper, barium, titanium, vanadium, nickel, cobalt, chromium contents in honey. Inductively coupled plasma atomic emission spectrometric method (ICP-AES)”, SN/T 2208-2008 “Determination of sodium, magnesium, aluminium, calcium, chromium, iron, nickel, copper, zinc, arsenic, strontium, molybdenum, cadmium, lead, mercury, selenium, in aquatic products - Microwave digestion - ICP/MS method ". As compared with GB/T 5009.182-2003, the main changes of this standard are as follows. ---The standard name is changed to “National food safety standard - Determination of aluminium in foods"; ---Improve method I spectrophotometry; ---Add inductively coupled plasma mass spectrometry as method II; ---Add inductively coupled plasma emission spectrometry as method III; ---Add graphite furnace atomic absorption spectrometry as method IV. National food safety standard - Determination of aluminum in foods

1 Scope

This standard specifies some methods for determination of aluminum content in foods, such as spectrophotometry, inductively coupled plasma mass spectrometry, inductively coupled plasma emission spectrometry and graphite furnace atomic absorption spectrometry. Method I in this standard applies to the detection of aluminum in foods containing aluminum-based food additives. Method II, method III and method IV are applicable to the detection of aluminum in foods. Method I. Spectrophotometry

2 Principles

After the sample is treated, it is in ethylenediamine-HCl buffer solution (pH 6.7- 7.0), with the existence of Triton X-100 and cetylpyridinium bromide (CPB), trivalence aluminum ion reacts with chrome azurol S to generate blue-green quaternary micelle.

3 Reagents and materials

Unless otherwise indicated, the reagents used in this method are analytical pure, the experimental water is the grade-3 water specified in GB/T 6682. 3.1 Reagents 3.1.1 Nitric acid (HNO3). guaranteed reagent. 3.1.2 Sulfuric acid (H2SO4). guaranteed reagent. 3.1.3 Hydrochloric acid (HCl). guaranteed reagent. 3.1.11 Ascorbic acid (C6H8O6). 3.2 Reagent preparation 3.2.1 Hydrochloric acid solution (1+1). MEASURE 50 mL of hydrochloric acid; MIX it uniformly with 50 mL of water. 3.2.2 Sulfuric acid solution (1%). PIPETTE 1 mL of sulfuric acid; POUR slowly into 80 mL of water; USE water to dilute it to 100 ml after cooling; MIX it uniformly. 3.2.12 Ethylenediamine solution (1+2). MEASURE 10 mL of ethylenediamine; slowly POUR into 20 mL of water; MIX it uniformly. 3.2.13 Ethylenediamine-hydrochloric acid buffer solution (pH6.7~7.0). MEASURE 100 mL of ethylenediamine; slowly POUR into 200 mL of water along glass rod; after cooling, ADD slowly 190 mL of hydrochloric acid along glass rod; MIX it uniformly; if pH > 7.0 or pH < 6.7, USE hydrochloric acid solution (1+1) or ethylenediamine solution (1+ 2) to adjust pH respectively. 3.2.14 Ascorbic acid solution (10 g/L). WEIGH 1 g of ascorbic acid; USE water to dilute it to 100 mL; MIX uniformly. Prepare it before use. 3.3 Standards Aluminum standard solution. 1000 mg/L. Or aluminum standard solution with a certain concentration which is identified by national authentication and awarded a reference material certificate. 3.4 Standard solution preparation 3.4.1 Aluminum standard intermediate solution (100 mg/L). Accurately PIPETTE 1.00 mL of aluminum standard solution (1000 mg/L) into 10 mL volumetric flask; ADD nitric acid solution (5%) to dilute it to the mark; MIX it uniformly.

4 Instrument and equipment

Note. All glassware must be soaked in nitric acid solution (1+5) for more than 24h, washed repeatedly with tap water, finally rinsed with water. Dry it by airing before use. 4.1 Spectrophotometer. 4.2 Balance. sensitivity is 1 mg. 4.5 Constant-temperature oven.

5 Analytical procedures

5.1 Sample Preparation In the process of sampling and sample preparation, pay attention not to contaminate the sample; avoid using aluminum-containing appliances. 5.2 Sample digestion WEIGH 0.2 g ~ 3 g of sample (accurate to 0.001g) or accurately MOVE 0.500 mL ~ 5.00 mL of liquid sample into hard glass digestion tube or conical flask; ADD 10 mL of nitric acid and 0.5 mL of sulfuric acid; HEAT it on adjustable temperature-control electric furnace or hot plate, reference conditions. 5.3 Color reaction and colorimetric determination Respectively PIPETTE 1.00 mL (V2) of sample digestive juice and blank solution; PLACE them into 25 mL plugged colorimetric tube; ADD water to 10 mL. In addition, TAKE seven 25 mL plugged colorimetric tubes; ADD respectively aluminum standard working solution 0 mL, 0.500 mL, 1.00 mL, 2.00 mL, 3.00 mL, 4.00 mL and 5.00 mL (in the series standard solution, the mass of aluminum is 0 μg, 0.500 μg, 1.00 μg, 2.00 μg, 3.00 μg, 4.00 μg, 5.00 μg respectively); ADD 1 mL of sulfuric acid solution (1%) in each tube successively; ADD water to 10 mL.

6 Analysis results expression

The aluminum content in the sample is calculated according to equation (1).

7 Precision

The absolute difference between two independent determinations obtained under repeatability conditions shall not exceed 10% of the arithmetic mean.

8 Others

When the sampling weight is 1 g(or 1 mL) and constant volume is 50 mL, the method detection limit is 8 mg/kg (or 8 mg/L) and the quantitative limit is 25 mg/kg (or 25 mg/L).

9 Principles

After sample digestion, it is atomized through graphite furnace to measure absorbance value at 257.4 nm.

10 Reagents and materials

Unless otherwise indicated, the reagents used in this method are guaranteed reagent, the experimental water is the grade-2 water specified in GB/T 6682. 10.1 Reagents mL of water; MIX it uniformly. 10.2.2 Nitric acid solution (5+95). MEASURE 5 mL of nitric acid; POUR into 95 mL of water; MIX it uniformly. 10.3 Standards Aluminum standard solution. 1000 mg/L. Or aluminum standard solution with a certain concentration which is identified by national authentication and awarded a reference material certificate. 10.4 Standard solution preparation 10.4.1 Aluminum standard intermediate solution (100 mg/L). Accurately PIPETTE 1.00 mL of aluminum standard solution (1000 mg/L) into 10 mL volumetric flask; ADD nitric acid solution (5+95) to dilute it to the mark; MIX it uniformly.

11 Instrument and equipment

Note. All glassware and digestion pots must be soaked in nitric acid solution (1+5) for more than 24h, washed repeatedly with tap water, finally rinsed with water. Dry it by airing before use. 11.1 Graphite Furnace Atomic Absorption Spectrometer. Attached aluminum 11.4 Adjustable hot plate. 11.5 Microwave digestion instrument. equipped with Teflon digestion inner-tank. 11.6 Pressure digestion pot. equipped with Teflon digestion inner-tank. 11.7 Constant-temperature oven ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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