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GB/T 42487-2023 English PDF

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GB/T 42487-2023: Soil quality - Determination of nitrate, nitrite and ammonium in soils - Extraction with potassium chloride solution and determination using automated method with segmented flow analysis
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GB/T 42487-2023English279 Add to Cart 3 days [Need to translate] Soil quality - Determination of nitrate, nitrite and ammonium in soils - Extraction with potassium chloride solution and determination using automated method with segmented flow analysis Valid GB/T 42487-2023

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Basic data

Standard ID GB/T 42487-2023 (GB/T42487-2023)
Description (Translated English) Soil quality -- Determination of nitrate, nitrite and ammonium in soils -- Extraction with potassium chloride solution and determination using automated method with segmented flow analysis
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard B10
Classification of International Standard 13.080
Word Count Estimation 16,170
Date of Issue 2023-03-17
Date of Implementation 2023-10-01
Issuing agency(ies) State Administration for Market Regulation, National Standardization Management Committee

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GB/T 42487-2023: Soil quality - Determination of nitrate, nitrite and ammonium in soils - Extraction with potassium chloride solution and determination using automated method with segmented flow analysis



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ICS 13.080 CCSB10 National Standards of People's Republic of China Soil quality Soil nitrate nitrogen, nitrite nitrogen and Determination of ammonium nitrogen Potassium chloride solution leaching flow analysis 2023-03-17 release 2023-10-01 implementation State Administration for Market Regulation Released by the National Standardization Management Committee

table of contents

Preface I 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Principle 1 5 Reagent 1 6 equipment 3 7 Preservation and processing of soil samples 3 8 Determination of soil samples 4 9 Calculation and presentation of results 7 10 Test report 8 Reference 10

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. This document is modified to adopt ISO 14256-2.2005 "Soil Quality Determination of Nitrate Nitrogen and Nitrite in Fresh Soil by Extraction of Potassium Chloride Solution" Nitrogen and Ammonium Nitrogen Part 2.Automated Flow Analysis. A chapter "Terms and Definitions" has been added to this document. The technical differences between this document and ISO 14256-2.2005 and their reasons are as follows. --- Replaced ISO 3696 (see 5.1) with the normatively quoted GB/T 6682 to adapt to my country's technical conditions and improve operability; --- Increased the purity requirements of reference substances (see 5.6, 5.7 and 5.10) to improve accuracy; --- Changed the amount of reference substances used (see 5.23, 5.24 and 5.25) to improve accuracy; --- Changed the reagent preparation process (see 5.28, 5.29, 5.31 and 5.32) to improve the standardization of preparation operations; --- Increased the use of commercial copper-plated cadmium grains (see 5.30) to improve the convenience of application; --- Changed the requirements on flow chart adjustment (see 6.7, 6.8 and 6.9) to meet the requirements of GB/T 1.1-2020. The following editorial changes have been made to this document. ---Change the name of the standard to "Soil Quality Soil Nitrate Nitrogen, Nitrite Nitrogen and Ammonium Nitrogen Determination Analysis method"; --- Deleted the footnote about the reagent polyoxyethylene lauryl ether; --- Deleted the suspension paragraph between Chapter 5 and 5.1 of ISO /T S14256-1.2003; --- Added the explanation of the symbol on the left side of the equal sign in the formula and the note about the calculation formula. 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, Nanjing Forestry University, East China Normal University, Jiangsu Shenda Inspection Co., Ltd. Division, Jiangsu Quality and Standardization Research Institute, Changzhou Wujin District Environmental Monitoring Station. The main drafters of this document. Wang Ruhai, Tang Haoye, Han Yong, Xu Renkou, Yu Yuanchun, Qian Wei, Wu Dianming, Chen Meijun, Duan Zengqiang, Lu Guoxing, Zhu Xiaofang, Zhao Min, Zhang Min, Bian Yan, Zhou Xiaolong. Soil quality Soil nitrate nitrogen, nitrite nitrogen and Determination of ammonium nitrogen Potassium chloride solution leaching flow analysis

1 Scope

This document describes the determination of nitrate nitrogen, nitrite nitrogen and ammonium nitrogen in fresh soil samples by leaching with 1 mol/L potassium chloride solution. flow analysis method. This document is applicable to all types of soil samples that have been homogeneously mixed by appropriate means.

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 6682 Analytical laboratory water specifications and test methods (GB/T 6682-2008, ISO 3696.1987, MOD) ISO 11465 Soil quality Determination of soil dry matter and moisture content Gravimetric method (Soilquality-Determination

3 Terms and Definitions

This document does not have terms and definitions that need to be defined.

4 principles

The uniformly mixed soil samples were leached with 1mol/L potassium chloride solution, and the nitrate in the solution was determined by an automated flow analysis system. The concentration of nitrogen, nitrite nitrogen and ammonium nitrogen. Note. The determination method in this document is based on the flow analysis system, both flow injection and continuous flow analysis systems are applicable.

5 reagents

Unless otherwise stated, all reagents in this document are of analytical grade. 5.1 Experimental water, the electrical conductivity at 25°C is not higher than 0.1mS/m, which meets the second-grade water in GB/T 6682. 5.2 Ammonium chloride, NH4Cl. 5.3 Potassium chloride, KCl. 5.4 Sodium citrate dihydrate, C6H5Na3O7·2H2O. 5.5 Sodium hydroxide, NaOH. 5.6 Potassium nitrate, KNO3, reference substance. 5.7 Sodium nitrite, NaNO2, reference material.
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