1 Scope
This standard specifies the method for determining phosphates in foods.
This standard is applicable to the determination of phosphate, pyrophosphate, hexametaphosphate, trimetaphosphate and tripolyphosphate in foods.
2 Principles
Extract and purify the specimen by adopting corresponding methods, take potassium hydroxide solution as eluent, separate with anion exchange column and detect with electrical conductivity detector. Determine the nature with retention time and determine the quantity with the external standard method.
3 Reagents and Materials
Unless otherwise specified, guaranteed reagents and Class I water (defined in GB/T 6682) are adopted for the purposes of this method.
3.1 Reagents
3.1.1 Sodium hydroxide (NaOH).
3.1.2 Potassium hydroxide (KOH).
3.1.3 Methanol (CH3OH): chromatographically pure.
3.2 Reagent preparation
1 Scope
2 Principles
3 Reagent and Materials
4 Instruments and Apparatus
5 Analysis Steps
6 Expression of Analysis Results
7 Precision
8 Others
Appendix A Conversion Coefficient of Polyphosphate Anion
Appendix B Ion Chromatograms for Five Kinds of Phosphate Anion Standard Solutions
Standard
GB 5009.256-2016 National Standard of Food Safety Determination of Phosphates in Foods (English Version)
Standard No.
GB 5009.256-2016
Status
valid
Language
English
File Format
PDF
Word Count
3500 words
Price(USD)
60.0
Implemented on
2016-9-20
Delivery
via email in 1 business day
Detail of GB 5009.256-2016
Standard No.
GB 5009.256-2016
English Name
National Standard of Food Safety Determination of Phosphates in Foods
1 Scope
This standard specifies the method for determining phosphates in foods.
This standard is applicable to the determination of phosphate, pyrophosphate, hexametaphosphate, trimetaphosphate and tripolyphosphate in foods.
2 Principles
Extract and purify the specimen by adopting corresponding methods, take potassium hydroxide solution as eluent, separate with anion exchange column and detect with electrical conductivity detector. Determine the nature with retention time and determine the quantity with the external standard method.
3 Reagents and Materials
Unless otherwise specified, guaranteed reagents and Class I water (defined in GB/T 6682) are adopted for the purposes of this method.
3.1 Reagents
3.1.1 Sodium hydroxide (NaOH).
3.1.2 Potassium hydroxide (KOH).
3.1.3 Methanol (CH3OH): chromatographically pure.
3.2 Reagent preparation
Contents of GB 5009.256-2016
1 Scope
2 Principles
3 Reagent and Materials
4 Instruments and Apparatus
5 Analysis Steps
6 Expression of Analysis Results
7 Precision
8 Others
Appendix A Conversion Coefficient of Polyphosphate Anion
Appendix B Ion Chromatograms for Five Kinds of Phosphate Anion Standard Solutions