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GB/T 21913-2008: Determination of talc in foods
Status: Obsolete
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| GB/T 21913-2008 | English | 199 |
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Determination of talc in foods
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GB/T 21913-2008
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Basic data | Standard ID | GB/T 21913-2008 (GB/T21913-2008) | | Description (Translated English) | Determination of talc in foods | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | X04 | | Classification of International Standard | 67.040 | | Word Count Estimation | 5,591 | | Date of Issue | 2008-05-16 | | Date of Implementation | 2008-11-01 | | Quoted Standard | GB/T 6682 | | Regulation (derived from) | National Standard Approval Announcement 2008 No.9 (Total No.122) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the determination of foods talc. This standard applies to the determination of foods talc. The detection limit of the standard 0. 15g/100g. | GB/T 21913-2008: Determination of talc in foods---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Determination of talc in foods
ICS 67.040
X04
National Standards of People's Republic of China
DETERMINATION talc
Posted 2008-05-16
2008-11-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard by the national food safety emergency standardization working group proposed and managed.
This standard was drafted. Jilin Province Product Quality Supervision and Inspection Institute.
The main drafters of this standard. Liu Jun will be, a border Li, Guo Jiguang, Hua Lei, Li Gang, Wang Yang, Li Ying Qian, Li Chunyang.
DETERMINATION talc
1 Scope
This standard specifies the method for determination in food talc.
This standard applies to the determination of foods talc.
The standard detection limit of 0.15g/100g.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-1992, neq ISO 3696. 1987)
Principle 3
Talc is the main component of natural hydrated magnesium silicate (3MgO · 4SiO2 · H2O), do not dissolve in a mixed acid (nitric acid + perchloric acid), may
The reaction with the water-soluble magnesium salt of hydrofluoric acid generated. Mixed acid digested sample was filtered, and the other magnesium-containing material was separated and removed; then with a mixed acid
And hydrofluoric acid digestion talc, magnesium content of the test solution was measured by flame atomic absorption spectrometry. According to the magnesium content of the sample is calculated in talc
content.
4 Reagents
The following reagents, unless otherwise stated, reagents were of analytical grade. Test water line with a water requirement GB/T 6682 regulations.
4.1 strontium chloride (excellent pure).
4.2 nitrate.
4.3 perchloric acid.
4.4 hydrofluoric acid.
4.5 hydrochloric acid.
4.6 mixed acid. nitric acid + perchloric acid (4 + 1).
4.7 strontium chloride solution (15g/L). Weigh strontium chloride 15g, addition of hydrochloric acid (4.5) 45mL, diluted with water, dilute to 1000mL.
4.8 Magnesium standard stock solution. accurately weighed magnesium (purity greater than 99.99%) 1.0000g or 1.6580g magnesia (purity greater than
99.99%), hydrochloric acid (4.5) 45mL dissolved, diluted with water, dilute to 1000mL. Store in a polyethylene bottle, 4 ℃ preservation. This solution
Equivalent to 1mg per milliliter of liquid magnesium.
4.9 Magnesium standard solution. Imbibe magnesium standard stock solution (4.8) 10mL, diluted with strontium chloride solution (4.7), set the volume to 100mL, this
Equivalent to 0.1mg per milliliter solution of magnesium.
5 Apparatus and materials
5.1 Flame atomic absorption spectrophotometer (with magnesium hollow cathode lamp).
5.2 adjustable electric hot plate.
5.3 teflon crucible (250mL, with cover).
5.4 quantitative filter paper (fast).
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