GB/T 42490-2023 English PDF

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GB/T 42490-2023: Soil quality - Determination of total content and isotope ratio of organic carbon and nitrogen of soil and biological samples - Stable isotope ratio mass spectrometry
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 42490-2023	279	Add to Cart	3 days	Soil quality - Determination of total content and isotope ratio of organic carbon and nitrogen of soil and biological samples - Stable isotope ratio mass spectrometry	Valid

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Basic data

Standard ID: GB/T 42490-2023 (GB/T42490-2023)
Description (Translated English): Soil quality - Determination of total content and isotope ratio of organic carbon and nitrogen of soil and biological samples - Stable isotope ratio mass spectrometry
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: B10
Classification of International Standard: 13.080.01
Word Count Estimation: 14,120
Date of Issue: 2023-03-17
Date of Implementation: 2023-10-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 42490-2023: Soil quality - Determination of total content and isotope ratio of organic carbon and nitrogen of soil and biological samples - Stable isotope ratio mass spectrometry

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 13.080.01 CCSB10 National Standards of People's Republic of China Soil Quality Organic Carbon Content in Soil and Biological Samples and carbon isotope ratio, total nitrogen content and nitrogen isotope Stable Isotope Ratio Mass Spectrometry Released on 2023-03-17 2023-10-01 implementation State Administration for Market Regulation Released by the National Standardization Management Committee

table of contents

Preface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Abbreviations 2 5 Principle 2 6 Reagents and materials 2 7 Instruments and Equipment 2 8 Test Step 3 9 calculation 4 10 Precision of measurement results 5 11 Quality Assurance and Control 6 Appendix A (informative) Standard substance 7 Reference 8

foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules for Standardization Documents" drafting. Please note that some contents of this document may refer to patents. The issuing agency of this document assumes no responsibility for identifying patents. This document was proposed by the Ministry of Agriculture and Rural Affairs of the People's Republic of China. This document is under the jurisdiction of the National Soil Quality Standardization Technical Committee (SAC/TC404). This document was drafted by. Nanjing Institute of Soil Science, Chinese Academy of Sciences, Institute of Urban Environment, Chinese Academy of Sciences, Subtropical Agricultural Sciences, Chinese Academy of Sciences Industrial Ecology Research Institute, Nanjing Normal University, Shanghai Jiaotong University, Beijing Kehui Testing Technology Co., Ltd., Jiangsu Quality and Standardization Research Institute Academy. The main drafters of this document. Cao Yacheng, Wang Xi, Sun Xiaoli, Sun Deling, Zhang Han, Yuan Hongchao, Wen Teng, Zhang Li, Yang Lu, Dai Chenyan, He Zhen, Wei Lai, Yang Fan, Zhang Shanshan, Zha Mingxia, Wu Jie. Soil Quality Organic Carbon Content in Soil and Biological Samples and carbon isotope ratio, total nitrogen content and nitrogen isotope Stable Isotope Ratio Mass Spectrometry

1 Scope

This document describes the determination of soil and biological samples (plants, The method of organic carbon content and carbon isotope ratio, total nitrogen content and nitrogen isotope ratio in animals, microorganisms). This document is applicable to the determination of organic carbon and total nitrogen in soil and biological samples, as well as non-marker (natural abundance) and tracer tests. Determination of carbon and nitrogen isotope ratios of organic carbon and total nitrogen in soil and biological samples tested (f13C≤30%, f15N≤30%). This document determines the quantitative limits of organic carbon, total nitrogen content and carbon and nitrogen isotope ratios in soil and biological samples (in terms of absolute carbon and nitrogen). Carbon 30μg; Nitrogen 20μg.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document. GB/T 6379.2 Accuracy of measurement methods and results (trueness and precision) - Part 2.Determination of repeatability of standard measurement methods Fundamental methods of sex and reproducibility GB/T 6682 Analytical laboratory water specifications and test methods GB/T 37847-2019 General Rules for Isotopic Composition Mass Spectrometry Methods GB/T 37885 Classification of Chemical Reagents

3 Terms and Definitions

The following terms and definitions defined in GB/T 37847-2019 apply to this document. 3.1 isotope Different atoms of the same element with the same number of protons but different numbers of neutrons (or different mass numbers). 3.2 isotope ratio isotoperatio The ratio of the number of moles or atoms or ions of two isotopes. 3.3 isotope abundance The percentage of isotope atomic number in the element's total atomic number. Note. The isotopic abundance is expressed in percentage (%). 3.4 isotopic composition isotopecomposition The proportion of each isotope in an element expressed in atomic percentage, and their sum is equal to 1. ......

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