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GB/T 45891-2025: Fertilizers and soil conditioners - Determination of humic and hydrophobic fulvic acids concentrations in fertilizer materials
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Fertilizers and soil conditioners - Determination of humic and hydrophobic fulvic acids concentrations in fertilizer materials
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Basic data
Standard ID: GB/T 45891-2025 (GB/T45891-2025)
Description (Translated English): Fertilizers and soil conditioners - Determination of humic and hydrophobic fulvic acids concentrations in fertilizer materials
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G20
Classification of International Standard: 65.080
Word Count Estimation: 17,158
Date of Issue: 2025-06-30
Date of Implementation: 2026-01-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration
GB/T 45891-2025: Fertilizers and soil conditioners - Determination of humic and hydrophobic fulvic acids concentrations in fertilizer materials
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT45891-2025
ICS 65.080
CCSG20
National Standard of the People's Republic of China
Fertilizers and soil conditioners Humic acid and
Determination of hydrophobic fulvic acid content
(ISO 19822.2018, IDT)
Released on June 30, 2025
Implementation on January 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
Preface
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 equivalent to ISO 19822.2018 “Fertilizers and soil conditioners - Humic acid and hydrophobic fulvic acid content in fertilizer raw materials”
Determination".
The following minimal editorial changes have been made to this document.
---Corrected the chapter and article numbering of the original international document, changing 5.3 and 5.4 of the original document to 5.2 and 5.3;
--- Corrected the inconsistency of sieve aperture size, changing 74μm to 75μm (see 7.21);
--- Corrected the inconsistency in the size of the hydrogen ion exchange chromatography column, changing 5cm×50cm to 5cm×60cm (see
14.2.2);
--- Increased formula numbers and replaced text with symbols (see Chapter 13).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Petroleum and Chemical Industry Federation.
This document is under the jurisdiction of the National Technical Committee for Standardization of Fertilizers and Soil Conditioners (SAC/TC105).
This document was drafted by. Shandong Qianfeng Agricultural Technology Co., Ltd., Shanghai Chemical Industry Research Institute Testing Co., Ltd., Sichuan Provincial Chemical Quality and Safety Inspection Co., Ltd.
Research Institute of Measurement, Shanghai Huanqiu Engineering Co., Ltd., Shandong Fertilizer and Coal Chemical Industry Association, Liaoning Putian Technology Co., Ltd., Chongqing Jianfeng Chemical
Co., Ltd., Beijing Jiabowen Biotechnology Co., Ltd., Sichuan Zhongkang Testing Technology Service Co., Ltd., Longmang Dadi Agriculture Co., Ltd.
Company, Sichuan Runer Technology Co., Ltd., Hubei Century Yuntian Chemical Engineering Co., Ltd., Shandong Product Quality Inspection Institute, Shanghai
Chemical Research Institute Co., Ltd.
The main drafters of this document are. Tian Yewei, Chen Xiaoxia, Wei Zheng, Fan Xiukai, Liu Tao, Chen Jiao, Shang Shanshan, Cao Hongyu, Ma Qian, Yan Kun, Zhang Rong,
Ying Xianqiang, Yu Yun, Zhang Weicai, Zheng Dianfeng, and Leng Peng.
Fertilizers and soil conditioners Humic acid and
Determination of hydrophobic fulvic acid content
1 Scope
This document describes the method for the determination of humic acid and hydrophobic fulvic acid.
This document applies to the humic and hydrophobic fulvic acid contents of solid and liquid raw materials in commercial fertilizers, soil conditioners and geological deposits.
Determination of quantity.
2 Normative references
This document has no normative references.
3 Terms and Definitions
The following terms and definitions apply to this document.
The URLs for terminology databases used for standardization maintained by ISO and IEC are as follows.
3.1
hydrophobic fulvic acid
The sulfur (S) content is less than 0.75%, soluble in alkaline and acidic aqueous solutions and can be absorbed by medium-polar polymers at pH = 1.
Substances adsorbed by the resin. The resin is used to adsorb amphiphilic compounds with a specific fulvic acid molecular weight.
3.2
Contains fulvic acid fraction
Contains fulvic acid components
The part of the alkaline extract of humus that is soluble in both alkaline solution and acid solution.
3.3
Humic acid humicacids; HA
Humic base extract is insoluble in strong acidic solution and precipitates in acidic solution with pH=1.
3.4
humic substance
The main organic components of natural organic matter are formed by biochemical reactions during the decay and transformation of plant and microbial remains.
A complex and heterogeneous mixture of carbon-based substances.
3.5
lignosulfonates
An amorphous, light brown to dark brown powder or liquid obtained from softwood pulping by the sulfite pulping process. Lignin is composed of three aromatic alcohols.
A sulfonated random polymer mainly composed of coniferyl alcohol (coniferyl alcohol, p-coumaryl alcohol and sinapyl alcohol).
......
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