GB/T 42485-2023 English PDF

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GB/T 42485-2023: Soil quality - Determination of nitrate, nitrite and ammonium in soils - Extraction with potassium chloride solution and determination with manual method
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 42485-2023	359	Add to Cart	4 days	Soil quality - Determination of nitrate, nitrite and ammonium in soils - Extraction with potassium chloride solution and determination with manual method	Valid

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Basic data

Standard ID: GB/T 42485-2023 (GB/T42485-2023)
Description (Translated English): Soil quality - Determination of nitrate, nitrite and ammonium in soils - Extraction with potassium chloride solution and determination with manual method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: B10
Classification of International Standard: 13.080
Word Count Estimation: 18,147
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 42485-2023: Soil quality - Determination of nitrate, nitrite and ammonium in soils - Extraction with potassium chloride solution and determination with manual method

---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.
ICS13:080 CCSB10 National Standards of People's Republic of China Soil quality Soil nitrate nitrogen, nitrite nitrogen and Determination of ammonium nitrogen Potassium chloride solution Extraction Manual Analysis manual method solution-Part 1: Manual method, MOD) 2023-03-17 release 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 Principle 1 5 Preservation of soil samples1 6 Laboratory samples 2 7 Determination of soil samples 2 7:1 Extraction 2 7:2 Determination of the total amount of nitrate nitrogen and nitrite nitrogen 3 7:3 Determination of nitrite nitrogen 8 7:4 Determination of ammonium nitrogen 9 8 Test report 11 Reference 12

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 /T S14256-1:2003 "Soil Quality Potassium Chloride Solution Extraction Determination of Nitrate Nitrogen and Substance in Fresh Soil Nitrate nitrogen and ammonium nitrogen Part 1: Manual analysis method", the document type is adjusted from the ISO technical specification to the national standard of our country: A chapter "Terms and Definitions" has been added to this document: Compared with ISO /T S14256-1:2003, this document has made the following structural adjustments: ---7:2:3:13, 7:3:3:7, 7:4:3:5 and 7:4:3:7 respectively correspond to 6:2:3:12:1, 6:3:3:7:1 and 6:3:3:7:1 of ISO /T S14256-1:2003 6:4:3:4:1 and 6:4:3:5:1; ---Added 7:2:5:1, 7:2:5:2, 7:2:5:3, 7:2:5:4, 7:2:5:5, 7:2:5:6 and 7:2:6 corresponding to ISO /T S14256-1:2003 6:2:5 of; --- Deleted 6:3:3:3 of ISO /T S14256-1:2003; ---7:3:2 corresponds to 6:3:2 of ISO /T S14256-1:2003; ---7:4:2 corresponds to 6:4:2 of ISO /T S14256-1:2003: The technical differences between this document and ISO /T S14256-1:2003 and their reasons are as follows: --- Replaced ISO 3696 (see 7:1:2:1, 7:2:3:1, 7:3:3:1 and 7:4:3:1) with the normatively quoted GB/T 6682 to accommodate my country's technical conditions, improve operability; --- Increase the purity requirements of reference substances (see 7:2:3:2, 7:2:3:3, 7:3:3:2 and 7:4:3:3) to improve accuracy; --- Changed the usage of reference substances (see 7:2:3:2:1, 7:2:3:3:1, 7:3:3:2:1 and 7:4:3:3:1) to improve accuracy; --- Changed the mass concentration of the nitrate nitrogen standard solution (see 7:2:3:2:2) to adapt to the preparation of the standard curve; ---Changed the concentration of chemical reagents (see 7:2:3:5, 7:2:3:8 and 7:3:3:3) to meet my country's reagent standards; --- Deleted unused reagents (see 6:3:3:3 of ISO /T S14256-1:2003); --- Added the content that commercialized copper-plated cadmium grains can be purchased (see 7:2:4:1) to improve the convenience of application; --- Added the series preparation of nitrate nitrogen standard solution (see 7:2:5:1) to prepare for the multi-point standard curve method of nitrate nitrogen; --- Changed the description of the reduction step (see 7:2:5:3) to adapt to the determination of the standard curve method; --- Add water to the scale line (see 7:2:5:4, 7:3:4 and 7:4:4) to improve the measurement accuracy; --- Changed the amount of developer used (see 7:2:5:4, 7:3:4 and 7:4:4) to meet the demand for constant volume; ---Changed the calibration curve (see 7:2:5:5, 7:3:4 and 7:4:4), compared with the two-point calibration curve, the multi-point calibration curve can reduce the error Poor, improve accuracy; --- Changed the representation of the calculation formula (see 7:2:6, 7:3:5 and 7:4:5) to match the method using the multi-point calibration curve; --- Changed the concentration of the developer (see 7:4:3:12) to comply with the usage of the developer: 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 note of 6:1:4 in ISO /T S14256-1:2003; --- Deleted the suspension paragraph between 6:2:2 and 6:2:2:1 in ISO /T S14256-1:2003: 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 Yanqin, Bian Yan, Zhou Xiaolong: Soil quality Soil nitrate nitrogen, nitrite nitrogen and Determination of ammonium nitrogen Potassium chloride solution Extraction Manual 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: Manual analysis method: This document is applicable to all types of soil samples that have been homogeneously mixed by appropriate methods:

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

Use 1mol/L potassium chloride solution to extract the mixed soil samples, and use a spectrophotometer to measure nitrate nitrogen and nitrite in the solution: Nitrogen and ammonium nitrogen concentrations:

5 Preservation of soil samples

Soil samples should be protected from heating during collection: During the transportation of soil samples to the laboratory, there should be no heating and temperature rise, and it should be transported in a refrigerator, especially in late spring and summer: If the soil samples are analyzed within 3 days, they can be stored at 4°C: Otherwise, the soil samples should be stored frozen at -20°C, which can make the soil samples The inorganic nitrogen content in the product will not change significantly within a few weeks: When using frozen samples for determination, the temperature and duration of the thawing process should be controlled: Mix well within 4 hours after thawing It can be thawed at room temperature; if it is thawed at 4°C, the thawing time should not exceed 48h: The time required for thawing is largely influenced by the sample volume: Before cryopreservation, the amount of soil sample should be reduced as much as possible: ......

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