Foreword
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard replaces GB 5009.15-2014 National food safety standard - Determination of cadmium in foods.
The following main modifications have been made with respect to GB 5009.15-2014:
——"Method II Inductively coupled plasma/mass spectrometry" has been added;
——"Annex A Temperature programming for microwave digestion and reference conditions for graphite furnace atomic absorption spectrometer" has been added;
——the subclause "Specimen preparation" has been modified;
——the wet digestion, digestion in pressure tank and microwave digestion have been modified, and the dry digestion has been deleted;
——the matrix modifier for graphite furnace atomic absorption spectrometry has been modified.
National food safety standard -
Determination of cadmium in foods
1 Scope
This standard specifies the determination of cadmium in foods by graphite furnace atomic absorption spectrometry and inductively coupled plasma/mass spectrometry.
This standard is applicable to the determination of cadmium in foods.
Method I Graphite furnace atomic absorption spectrometry
2 Principle
Atomize the digested specimen in a graphite furnace, and determine the absorbance at 228.8nm. Within a certain concentration range, the absorbance of cadmium is proportional to the cadmium content, which is quantified by comparing with the standard solution series.
3 Reagents and materials
Unless otherwise specified, guaranteed reagents and Class-II water (defined in GB/T 6682) are adopted for the purpose of this method.
3.1 Reagents
3.1.1 Nitric acid (HNO3).
3.1.2 Perchloric acid (HClO4).
3.1.3 Ammonium dihydrogen phosphate (NH4H2PO4).
3.1.4 Palladium nitrate [Pd(NO3)2].
3.2 Preparation of reagents
3.2.1 Nitric acid solution (5+95): measure 50mL nitric acid, and pour it slowly into 950mL water and mix well.
3.2.2 Nitric acid solution (1+9): measure 50mL nitric acid, and pour it slowly into 450mL water and mix well.
3.2.3 Ammonium dihydrogen phosphate-palladium nitrate mixed solution: weigh 0.02g palladium nitrate, dissolve it with a small amount of nitric acid solution (1+9), and then add 2g ammonium dihydrogen phosphate, after dissolution, dilute it with nitric acid solution (5+95) to 100mL, and mix well.
3.3 Reference material
Cadmium chloride (CdCl2•2.5H2O, CAS No.: 7790-78-5): with purity >99.99%, or its reference material certified by the state and issued with the reference material certificate.
Foreword i
1 Scope
Method I Graphite furnace atomic absorption spectrometry
2 Principle
3 Reagents and materials
4 Instruments and equipment
5 Analysis steps
6 Expression of analysis results
7 Precision
8 Others
Method II Inductively coupled plasma/mass spectrometry
Annex A Temperature programming for microwave digestion and reference conditions for graphite furnace atomic absorption spectrometer
Foreword
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard replaces GB 5009.15-2014 National food safety standard - Determination of cadmium in foods.
The following main modifications have been made with respect to GB 5009.15-2014:
——"Method II Inductively coupled plasma/mass spectrometry" has been added;
——"Annex A Temperature programming for microwave digestion and reference conditions for graphite furnace atomic absorption spectrometer" has been added;
——the subclause "Specimen preparation" has been modified;
——the wet digestion, digestion in pressure tank and microwave digestion have been modified, and the dry digestion has been deleted;
——the matrix modifier for graphite furnace atomic absorption spectrometry has been modified.
National food safety standard -
Determination of cadmium in foods
1 Scope
This standard specifies the determination of cadmium in foods by graphite furnace atomic absorption spectrometry and inductively coupled plasma/mass spectrometry.
This standard is applicable to the determination of cadmium in foods.
Method I Graphite furnace atomic absorption spectrometry
2 Principle
Atomize the digested specimen in a graphite furnace, and determine the absorbance at 228.8nm. Within a certain concentration range, the absorbance of cadmium is proportional to the cadmium content, which is quantified by comparing with the standard solution series.
3 Reagents and materials
Unless otherwise specified, guaranteed reagents and Class-II water (defined in GB/T 6682) are adopted for the purpose of this method.
3.1 Reagents
3.1.1 Nitric acid (HNO3).
3.1.2 Perchloric acid (HClO4).
3.1.3 Ammonium dihydrogen phosphate (NH4H2PO4).
3.1.4 Palladium nitrate [Pd(NO3)2].
3.2 Preparation of reagents
3.2.1 Nitric acid solution (5+95): measure 50mL nitric acid, and pour it slowly into 950mL water and mix well.
3.2.2 Nitric acid solution (1+9): measure 50mL nitric acid, and pour it slowly into 450mL water and mix well.
3.2.3 Ammonium dihydrogen phosphate-palladium nitrate mixed solution: weigh 0.02g palladium nitrate, dissolve it with a small amount of nitric acid solution (1+9), and then add 2g ammonium dihydrogen phosphate, after dissolution, dilute it with nitric acid solution (5+95) to 100mL, and mix well.
3.3 Reference material
Cadmium chloride (CdCl2•2.5H2O, CAS No.: 7790-78-5): with purity >99.99%, or its reference material certified by the state and issued with the reference material certificate.
Contents of GB 5009.15-2023
Foreword i
1 Scope
Method I Graphite furnace atomic absorption spectrometry
2 Principle
3 Reagents and materials
4 Instruments and equipment
5 Analysis steps
6 Expression of analysis results
7 Precision
8 Others
Method II Inductively coupled plasma/mass spectrometry
Annex A Temperature programming for microwave digestion and reference conditions for graphite furnace atomic absorption spectrometer
