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SN/T 4678-2016: Determination of uranium and thorium in food for export--Inductively coupled plasma mass spectrometry method
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| SN/T 4678-2016 | English | 229 |
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Determination of uranium and thorium in food for export--Inductively coupled plasma mass spectrometry method
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SN/T 4678-2016
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Basic data | Standard ID | SN/T 4678-2016 (SN/T4678-2016) | | Description (Translated English) | Determination of uranium and thorium in food for export--Inductively coupled plasma mass spectrometry method | | Sector / Industry | Commodity Inspection Standard (Recommended) | | Classification of Chinese Standard | X04 | | Word Count Estimation | 10,195 | | Date of Issue | 2016-12-12 | | Date of Implementation | 2017-07-01 | | Regulation (derived from) | State-Quality-Inspection-Accredidation (2016) No.590 | | Issuing agency(ies) | General Administration of Customs | SN/T 4678-2016: Determination of uranium and thorium in food for export--Inductively coupled plasma mass spectrometry method
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(Method for determination of uranium and thorium in export food - Inductively coupled plasma mass spectrometry)
People's Republic of China Entry-Exit Inspection and Quarantine Industry Standard
Method for determination of uranium and thorium in exported foods
Inductively coupled plasma mass spectrometry
Released on December 12,.2016
2017-07-01 implementation
People's Republic
The General Administration of Quality Supervision, Inspection and Quarantine issued
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard is proposed and managed by the National Certification and Accreditation Administration.
This standard was drafted. Shanghai Entry-Exit Inspection and Quarantine Bureau of the People's Republic of China.
The main drafters of this standard. Yang Zhenyu, Shen Jinchao, Ni Kuanglu, Fan Xiang, Li Wei, Zhang Hui, Chen Zhangting, and Qi Hongchao.
Method for determination of uranium and thorium in exported foods
Inductively coupled plasma mass spectrometry
1 Scope
This standard specifies the method of inductively coupled plasma mass spectrometry for the determination of uranium and thorium in exported foods.
This standard applies to the determination of uranium and thorium in the export of grain, potato, vegetables and fruits, meat, fish and shrimps and milk foods.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 6682 Analytical laboratory water specifications and test methods
3 Method summary
The uranium and thorium in the sample are digested by a closed microwave and dissolved in an acid solution. Uranium and thorium in the solution are ionized in the plasma, and the measurement is special.
The mass count is counted, and within a certain range, the count rate is proportional to the uranium and strontium content. Standard curve internal standard method.
4 reagents and materials
The experimental water meets the requirements of the secondary water in GB/T 6682.
4.1 65% nitric acid. excellent grade pure.
4.2 Uranium standard solution. 1g/L, certified standard substance.
4.3 钍 standard solution. 1g/L, certified standard substances.
4.4 Nitric acid (2%, volume ratio). Take 2mL of nitric acid (4.1), and dilute to 100mL with water.
4.5 Uranium and thorium standard stock solution. Prepare a mixed solution with a concentration of 10mg/L uranium, 10mg/L 钍, and make up to volume with nitric acid solution (4.4). The
The solution is stored at room temperature and is effective for two months.
4.6 Uranium and thorium standard curve work. Dilute uranium and thorium standard stock solution (4.5) to 6 levels. 0.5μg/L, 1μg/L, 2μg/L,
5 μg/L, 10 μg/L, 15 μg/L, the final medium is nitric acid (4.4). The solution is ready for use.
4.7 铋 standard solution. 1g/L, certified standard substance.
4.8 Internal standard solution. Dilute the standard solution (4.7) to 50μg/L according to the ratio, and the final medium is nitric acid (4, 4). The solution is ready for use.
5 Instruments and equipment
5.1 Inductively coupled plasma mass spectrometer.
5.2 Closed microwave digestion instrument.
5.3 Analytical balance. Sensing 1mg.
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