|
US$359.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email.
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 | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 42485-2023 | English | 359 |
Add to Cart
|
4 days [Need to translate]
|
Soil quality - Determination of nitrate, nitrite and ammonium in soils - Extraction with potassium chloride solution and determination with manual method
| Valid |
GB/T 42485-2023
|
PDF similar to GB/T 42485-2023
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:
Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 42485-2023_English be delivered?Answer: Upon your order, we will start to translate GB/T 42485-2023_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time. Question 2: Can I share the purchased PDF of GB/T 42485-2023_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 42485-2023_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. If you need your currency to be printed on the invoice, please write an email to [email protected]. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.
|