GB/T 37865-2019 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 37865-2019 | English | 279 |
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Analysis method of 14C in biological samples - Oxygen bomb combustion method
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GB/T 37865-2019: Analysis method of 14C in biological samples - Oxygen bomb combustion method---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT37865-2019
(Analytical method of 14C in biological samples)
ICS 13.280
F70
National Standards of People's Republic of China
Analytical method for 14C in biological samples
Oxygen bomb combustion
Analysismethodof14Cinbiologicalsamples-
Oxgenbombcombustionmethod
Published on.2019-08-30
2020-03-01 implementation
State market supervision and administration
China National Standardization Administration 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 Nuclear Energy Standardization Technical Committee (SAC/TC58).
This standard was drafted. China Nuclear Power Operation Management Co., Ltd.
The main drafters of this standard. Gao Yang, Wang Rongren, Gu Yuzhong, Zhu Yuelong, Xia Zhenghai, Chen Yijun, Dong Meilian, Jiang Jianing.
Analytical method for 14C in biological samples
Oxygen bomb combustion
1 Scope
This standard specifies methods and procedures for the analysis and determination of 14C in biological samples by oxygen bomb combustion.
This standard applies to the analysis of 14C content in biological samples such as agricultural and livestock products, aquatic products and herbs.
The detection limit of this method is 10 Bq/kg C (absorption method), 30 Bq/kg C (suspension method).
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 10259 liquid scintillation counter
EJ/T 527 Basic provisions for biological sampling in environmental radiation monitoring
EJ/T 1008 Method for sampling and measuring 14C in air
HJ/T 61 Radiation Environmental Monitoring Technical Specification
3 Principle
The dried sample is burned under high pressure and oxygen enrichment conditions in the oxygen bomb, and the generated carbon dioxide is absorbed by the sodium hydroxide solution to form carbonic acid.
Calcium precipitation. The recovery of carbon conversion to calcium carbonate precipitation in the sample of the method is higher than 95%. See Appendix A for the recovery rate calculation method.
Absorption method. the prepared calcium carbonate precipitate is titrated with hydrochloric acid, and the released carbon dioxide is dried and absorbed by a special absorption liquid, and then flickered.
The liquid (4.20) was mixed to prepare a sample to be tested and measured in a liquid scintillation counter.
Suspension method. The prepared calcium carbonate precipitation powder is ground into a uniform powder by a mortar, and an appropriate amount of powder is weighed, and an emulsified scintillation liquid (4.21) is used.
The solid suspension measurement technique directly measures the specific activity of 14C in CaCO3 powder.
4 reagents and materials
Unless otherwise stated, only analytically pure reagents and distilled or deionized water or water of equivalent purity were used in the analysis.
4.1 14C standard solution containing 14C and capable of dissolving in organic matter in scintillation fluid (4.20), the activity concentration is recommended to be.200Bq/g~
2000Bq/g.
4.2 Standard source of calcium carbonate powder containing 14C, the activity concentration is recommended to be 20Bq/g~200Bq/g.
Note. Used during suspension method.
4.3 Background calcium carbonate, w (CaCO3) ≥ 99.0%.
4.4 sodium hydroxide solution, c (NaOH) = 3mol/L.
4.5 Sodium hydroxide solution, c (NaOH) = 0.5 mol/L.
4.6 Hydrochloric acid solution, c (HCl) = 2 mol/L.
4.7 Calcium chloride solution, c (CaCl2) = 8mol/L.
4.8 Nitrogen, w(N2) ≥ 99.9%.
GB/T 37865-2019
(Analytical method of 14C in biological samples)
ICS 13.280
F70
National Standards of People's Republic of China
Analytical method for 14C in biological samples
Oxygen bomb combustion
Analysismethodof14Cinbiologicalsamples-
Oxgenbombcombustionmethod
Published on.2019-08-30
2020-03-01 implementation
State market supervision and administration
China National Standardization Administration 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 Nuclear Energy Standardization Technical Committee (SAC/TC58).
This standard was drafted. China Nuclear Power Operation Management Co., Ltd.
The main drafters of this standard. Gao Yang, Wang Rongren, Gu Yuzhong, Zhu Yuelong, Xia Zhenghai, Chen Yijun, Dong Meilian, Jiang Jianing.
Analytical method for 14C in biological samples
Oxygen bomb combustion
1 Scope
This standard specifies methods and procedures for the analysis and determination of 14C in biological samples by oxygen bomb combustion.
This standard applies to the analysis of 14C content in biological samples such as agricultural and livestock products, aquatic products and herbs.
The detection limit of this method is 10 Bq/kg C (absorption method), 30 Bq/kg C (suspension method).
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 10259 liquid scintillation counter
EJ/T 527 Basic provisions for biological sampling in environmental radiation monitoring
EJ/T 1008 Method for sampling and measuring 14C in air
HJ/T 61 Radiation Environmental Monitoring Technical Specification
3 Principle
The dried sample is burned under high pressure and oxygen enrichment conditions in the oxygen bomb, and the generated carbon dioxide is absorbed by the sodium hydroxide solution to form carbonic acid.
Calcium precipitation. The recovery of carbon conversion to calcium carbonate precipitation in the sample of the method is higher than 95%. See Appendix A for the recovery rate calculation method.
Absorption method. the prepared calcium carbonate precipitate is titrated with hydrochloric acid, and the released carbon dioxide is dried and absorbed by a special absorption liquid, and then flickered.
The liquid (4.20) was mixed to prepare a sample to be tested and measured in a liquid scintillation counter.
Suspension method. The prepared calcium carbonate precipitation powder is ground into a uniform powder by a mortar, and an appropriate amount of powder is weighed, and an emulsified scintillation liquid (4.21) is used.
The solid suspension measurement technique directly measures the specific activity of 14C in CaCO3 powder.
4 reagents and materials
Unless otherwise stated, only analytically pure reagents and distilled or deionized water or water of equivalent purity were used in the analysis.
4.1 14C standard solution containing 14C and capable of dissolving in organic matter in scintillation fluid (4.20), the activity concentration is recommended to be.200Bq/g~
2000Bq/g.
4.2 Standard source of calcium carbonate powder containing 14C, the activity concentration is recommended to be 20Bq/g~200Bq/g.
Note. Used during suspension method.
4.3 Background calcium carbonate, w (CaCO3) ≥ 99.0%.
4.4 sodium hydroxide solution, c (NaOH) = 3mol/L.
4.5 Sodium hydroxide solution, c (NaOH) = 0.5 mol/L.
4.6 Hydrochloric acid solution, c (HCl) = 2 mol/L.
4.7 Calcium chloride solution, c (CaCl2) = 8mol/L.
4.8 Nitrogen, w(N2) ≥ 99.9%.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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