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GB/T 25222-2010: Inspection of grain and oils -- Determination of phosphide residues in grain -- Spectrophotometric method
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Inspection of grain and oils -- Determination of phosphide residues in grain -- Spectrophotometric method
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GB/T 25222-2010
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Basic data | Standard ID | GB/T 25222-2010 (GB/T25222-2010) | | Description (Translated English) | Inspection of grain and oils -- Determination of phosphide residues in grain -- Spectrophotometric method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | B20 | | Classification of International Standard | 67.060 | | Word Count Estimation | 6,654 | | Date of Issue | 2010-09-26 | | Date of Implementation | 2011-03-01 | | Quoted Standard | GB 5491; GB/T 6682 | | Regulation (derived from) | National Standard Approval Announcement 2010 No.6 (Total No.161) | | 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 spectrophotometric method-Determination phosphide residues in food terms and definitions, principle, reagents and materials, instruments and equipment, for sampling, sample preparation, steps, calculation and presentation of results. This standard applies to the determination of phosphide fumigant residues in food. The detection limit of the standard method of 0. 01mg/kg. | GB/T 25222-2010: Inspection of grain and oils -- Determination of phosphide residues in grain -- Spectrophotometric method
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Inspection of grain and oils. Determination of phosphide residues in grain. Spectrophotometric method
ICS 67.060
B20
National Standards of People's Republic of China
Determination phosphide residues in food grain and oil inspection
Issued on. 2010-09-26
2011-03-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
The standard proposed by the National Food Authority.
This standard by the National Standardization Technical Committee OILS.
This standard is drafted by. Nanjing University of Finance and Economics.
Participated in the drafting of this standard. Jiangsu Cereals, Oils Quality Supervision, Inspection, Nanjing Quality Supervision and Inspection of grain and oil, grain and oil Jilin Province health
Inspection Stations.
The main drafters of this standard. Yuan Jian, Yang Xiaorong, Dai Bo, Wang Haifeng, Mo Xiaosong, in Xiaohe, high Xiaochun.
Determination phosphide residues in food grain and oil inspection
Spectrophotometry
1 Scope
This standard specifies the spectrophotometric determination of residues in food in phosphide terms and definitions, principles, reagents and materials, instruments and
Equipment for sampling, sample preparation, the steps, the results of the calculation and presentation.
This standard applies to the determination of phosphide fumigant residues in food.
The detection limit of the standard method of 0.01mg/kg.
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 5491 grain and oilseeds testing for sampling, and sample method
Laboratory use specifications and test methods GB/T 6682 Analysis
3 Terms and Definitions
The following terms and definitions apply to this standard.
3.1
Phosphide phosphide
Phosphorus-containing compound used as a fumigant, such as aluminum phosphide and the like.
3.2
Phosphide residues in phosphideresidues
Under this standard are measured residual phosphide content in grain. Phosphine accounting sample mass fraction representation.
Principle 4
Phosphide samples under the action of acid and water to produce phosphine gas, evaporated and taken up in the acidic potassium permanganate solution is oxidized to phosphorus
Acid, and then generate and ammonium molybdate ammonium phosphomolybdate effect, reduced to a blue molybdenum compound with stannous chloride --- blue, absorbance was measured using a standard curve
Statutory amount.
5 Reagents and materials
Unless otherwise specified, the reagents used were of analytical grade. Test water should comply with GB/T 6682 in the three requirements.
5.1 potassium permanganate solution (16.5g/L). Weigh 16.5g of potassium permanganate, after dissolved in water and diluted to 1000mL, stand three or heating
Boil 3min, cooled and allowed to stand overnight, filtered alternate with glass wool or asbestos.
5.2 potassium permanganate solution (3.3g/L). take a certain amount of potassium permanganate solution (5.1) was diluted with water five times.
(117) 5.3 Sulfate. Take 28mL98% sulfuric acid was slowly added 400mL of water, 500mL water was added to the cooled.
5.4 sulfate (15). Take 83.3mL98% sulfuric acid was slowly added 400mL of water, cooled water was added to 500mL.
5.5 saturated sodium sulfite solution. Take 28.5g of anhydrous sodium sulfite, add about 70mL of water, micro-heat to dissolve, cooled and diluted to 100mL.
5.6 ammonium molybdate solution. 50g/L.
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