GB/T 40461-2021Determination of sodium content for fertilizers (English PDF)
肥料中钠含量的测定
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 40461-2021 in 30 minutes.
Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
August 20, 2021
Implementation date
March 1, 2022
Scope
GB/T 40461-2021 is the English-translated version of 肥料中钠含量的测定.
GB/T 40461-2021 gives the methods for measuring the sodium content of fertilizers and soil conditioners.
Four techniques are covered: inductively coupled plasma emission spectrometry, flame atomic absorption spectrometry, flame atomic emission spectrometry and flame photometry, each with its own detection limit and limit of quantification stated in the scope.
The common part of the method describes the preparation of the sample solution: the reagents, including a citric acid solution, the laboratory equipment and test sieves, and how solid and liquid fertilizer samples are reduced, ground, sieved and stored.
Water must meet the grade 2 requirements of GB/T 6682, and NY/T 887 is cited for liquid fertilizer density. Fertilizer testing laboratories use it. It was issued on 20 August 2021 and has applied since 1 March 2022.
Found what you need?
Document preview — GB/T 40461-2021
National Standard of the People's Republic of China
- ICS
- 65.080
- Classification
- G 20
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Preparation of sample solution
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 of Standardization Documents" Drafting.
1 Scope
This document describes the methods for determining sodium content in fertilizers and soil conditioners, including inductively coupled plasma emission spectrometry, flame Absorption spectroscopy, flame atomic emission spectrometry and flame photometry.
This document applies to the determination of sodium content in fertilizers and soil conditioners.
In this document, the detection limit of inductively coupled plasma emission spectrometry is 2mg/kg, and the limit of quantification is 6mg/kg; flame atomic absorption The detection limit of spectrometry and flame atomic emission spectrometry is 30mg/kg, and the limit of quantification is 100mg/kg; the detection limit of flame photometry is 60mg/kg, the limit of quantification is 200mg/kg.
2 Normative references
The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that 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
NY/T 887 Determination of Density of Liquid Fertilizer
3 Terms and definitions
There are no terms and definitions that need to be defined in this document.
4 Preparation of sample solution
4.1 Reagents or materials
4.1.1 Unless otherwise stated, use analytical reagents and water that meets the requirements for secondary water in GB/T 6682.
4.1.2 Citric acid solution. rho=20mg/mL. Accurately weigh 20.0g of citric acid, dissolve it in water and place it in a 1000mL volumetric flask Mix well and store in a plastic bottle.
4.2 Equipment
4.2.1 Normal laboratory equipment.
4.2.2 Test sieve. the aperture is 0.50mm and 1.00mm.
4.3 Preparation of samples
Prepare laboratory samples as specified in the corresponding product standards. If it is not specified in the product standard, prepare according to the following method. solid fertilizer passes through After several times of reduction, take out about 100g, and quickly grind it until all of it passes the 0.50mm test sieve (if the sample is wet, it can pass the 1.00mm test Sieve), mix well and place in a clean, dry container; after shaking for many times, quickly take out about 100mL of liquid fertilizer and place it in a clean, dry container. In a dry container.
......
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
Similar standards
How to Download GB/T 40461-2021
- 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 6682-2008 — Water for analytical laboratory use - Specification and test methods
NY/T 887-2010 — Liquid fertilizers. Determination of density
GB/T 7251.4-2026 — Low-voltage switchgear and controlgear assemblies - Part 4: Particular requirements for assemblies for construction sites (ACS)
Secure payment via Stripe
Payments accepted
GB/T 40461-2021
$150.00