GB/T 42490-2023Soil quality—Determination of total content and isotope ratio of organic carbon and nitrogen of soil and biological samples—Stable isotope ratio mass spectrometry (English PDF)
土壤质量 土壤与生物样品中有机碳含量与碳同位素比值、全氮含量与氮同位素比值的测定 稳定同位素比值质谱法
This is a limited preview
Buy now to download the full PDF (15 pages)
Need quotation for your management?
Get a formal quotation for GB/T 42490-2023 in 30 minutes.
Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
March 17, 2023
Implementation date
October 1, 2023
Scope
GB/T 42490-2023 is the English-translated version of 土壤质量 土壤与生物样品中有机碳含量与碳同位素比值、全氮含量与氮同位素比值的测定 稳定同位素比值质谱法.
This document describes the determination of the organic carbon content and carbon isotope ratio and of the total nitrogen content and nitrogen isotope ratio of soil and of biological samples such as plants, animals and micro-organisms.
The document applies to the determination of organic carbon and total nitrogen in those samples, and to the determination of their carbon and nitrogen isotope ratios both at natural abundance and in tracer tests.
The quantification limits it sets, expressed as absolute carbon and nitrogen, are 30 micrograms of carbon and 20 micrograms of nitrogen.
Found what you need?
Document preview — GB/T 42490-2023
National Standard of the People's Republic of China
- ICS
- 13.080.01
- Classification
- B 10
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Preface
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 Abbreviations
- 5 Principle
- 6 Reagents and materials
- 7 Instruments and Equipment
- 8 Test Step
- 9 calculation
- 10 Precision of measurement results
- 11 Quality Assurance and Control
- Appendix A (informative) Standard substance
- Reference
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.
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
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
The proportion of each isotope in an element expressed in atomic percentage, and their sum is equal to 1.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 6379.2Accuracy (trueness and precision) of measurement methods and results - Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method
- GB/T 6682Water for analytical laboratory use - Specification and test methods
- GB/T 37847-2019General rules for isotope composition analysis by mass spectrometry
- GB/T 37885Chemical reagent—Classification
Similar standards
How to Download GB/T 42490-2023
- 1
Add to cart
Click "Download PDF" on this page and choose "Buy this standard". You can add more standards before checkout.
- 2
Checkout
Enter your email and billing details. Payment is processed securely by Stripe (cards or bank transfer). Prefer bank details? Request a quotation (min. order $300).
- 3
Instant delivery (0–9 sec)
Delivery is automatic: within seconds of payment you'll receive an email with a secure download link. The link stays valid for 72 hours.
- 4
Invoice included
A tax invoice is attached to the confirmation email. Need a custom invoice? Contact us.
Related Standards
GB/T 37847-2019 — General rules for isotope composition analysis by mass spectrometry
GB/T 37885-2019 — Chemical reagent—Classification
GB/T 6379.2-2004 — Measurement methods and results -- Accuracy (trueness and precision) -- Part 2: Determine the standard methods of measurement repeatability and reproducibility of the basic method
Secure payment via Stripe
Payments accepted
GB/T 42490-2023
$225.00