1 Scope
This standard specifies the limit test and quantitative test methods to determine the lead in food additives.
This standard is applicable to the limit test and quantitative test on lead in food additives.
Method I Diphenyl Thiocarbazone (Dithizone) Colorimetry
2 Principle
Treat the sample by adding diammonium hydrogen citrate, potassium cyanide and hydroxylamine hydrochloride, etc., to eliminate the interference of ions such as iron, copper and zinc. At pH 8.5~9.0, the lead ion reacts with diphenyl thiocarbazone (dithizone) to generate red complex which is extracted with trichloromethane. Carry out limit test or quantitative test and compare with the standard series.
3 Reagents and Materials
Note: unless otherwise specified, the reagents used in this method are analytically pure, and the water is Grade 1 water specified in GB/T 6682.
Contents
Foreword i
1 Scope
2 Principle
3 Reagents and Materials
4 Apparatus
5 Preparation of Samples
6 Determination
7 Expression of Analysis Result
8 Precision
9 Miscellaneous
10 Principle
11 Reagents and Materials
12 Apparatus
13 Analysis Procedures
14 Expression of Analysis Results
15 Precision
16 Miscellaneous
Appendix A Reference Conditions for Microwave Digestion
Standard
GB 5009.75-2014 National Food Safety Standard—Determination of Lead in Food Additives (English Version)
Standard No.
GB 5009.75-2014
Status
valid
Language
English
File Format
PDF
Word Count
4000 words
Price(USD)
100.0
Implemented on
2016-3-21
Delivery
via email in 1 business day
Detail of GB 5009.75-2014
Standard No.
GB 5009.75-2014
English Name
National Food Safety Standard—Determination of Lead in Food Additives
1 Scope
This standard specifies the limit test and quantitative test methods to determine the lead in food additives.
This standard is applicable to the limit test and quantitative test on lead in food additives.
Method I Diphenyl Thiocarbazone (Dithizone) Colorimetry
2 Principle
Treat the sample by adding diammonium hydrogen citrate, potassium cyanide and hydroxylamine hydrochloride, etc., to eliminate the interference of ions such as iron, copper and zinc. At pH 8.5~9.0, the lead ion reacts with diphenyl thiocarbazone (dithizone) to generate red complex which is extracted with trichloromethane. Carry out limit test or quantitative test and compare with the standard series.
3 Reagents and Materials
Note: unless otherwise specified, the reagents used in this method are analytically pure, and the water is Grade 1 water specified in GB/T 6682.
Contents of GB 5009.75-2014
Contents
Foreword i
1 Scope
2 Principle
3 Reagents and Materials
4 Apparatus
5 Preparation of Samples
6 Determination
7 Expression of Analysis Result
8 Precision
9 Miscellaneous
10 Principle
11 Reagents and Materials
12 Apparatus
13 Analysis Procedures
14 Expression of Analysis Results
15 Precision
16 Miscellaneous
Appendix A Reference Conditions for Microwave Digestion