GB 5084-2021
Standard for irrigation water quality (English Version)

Standard No.

GB 5084-2021

Language

Chinese, Available in English version

Release Date

2021

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB 5084-2021

Replace

GB 5084-2005 GB 22573-2008 GB 22574-2008

Introduction

1. Background and significance of standard revision

GB5084—2021 "Farmland Irrigation Water Quality Standard" is one of the core standards in the field of environmental protection of the People's Republic of China, aiming to ensure the safety of cultivated land, groundwater and agricultural product quality. Since its first release in 1985, the standard has undergone several revisions, fully reflecting the continuous progress of agricultural environmental protection and water quality management in my country.

---

2. Comparison of standard frameworks

Standard version	Scope of application	New content	Revision points
GB5084—2005	Applicable to farmland irrigation water quality management of surface water and groundwater.	No control items for organic pollutants are included.	For the first time, the pH range of irrigation water is clarified, and basic control items such as suspended solids and chemical oxygen demand are added.
GB22573—2008	Specially targets the limit requirements for chlorobenzene compounds in irrigation water.	Heavy metals and other inorganic pollutants are not covered.	Added limit values for 1,2-dichlorobenzene and 1,4-dichlorobenzene, and refined the monitoring methods.
GB22574—2008	Specifies the limit standards for organic pollutants in irrigation water.	No specific requirements for inorganic pollutants are included.	Added items such as toluene and xylene, and optimized the analysis methods.
GB5084—2021	Fully covers farmland irrigation water quality management, including basic control items and selective control items.	Added 9 optional control items such as total nickel, chlorobenzene, and nitrobenzene.	Modified monitoring requirements and added implementation and supervision chapters.

---

3. Interpretation of the main contents of the standard

Basic control items include pH value, suspended solids, chemical oxygen demand (CODCr), anionic surfactants, etc., which are the core indicators of farmland irrigation water quality. For example, the limit of chemical oxygen demand (CODCr) is ≤150 mg/L (paddy field crops), which requires strict control of the impact of industrial wastewater discharge on irrigation water sources during the monitoring process.

Selective control items vary according to the region and crop type. For example, paddy crops need to focus on monitoring indicators such as chloride and sulfide, while dryland crops are more concerned about the content of heavy metals such as total lead and total cadmium.

---

4. Implementation recommendations

Case analysis: Measures to improve farmland irrigation water quality in a certain area

In actual application, it is recommended that local governments:

• Establish a regional farmland irrigation water quality monitoring network and conduct regular sampling and analysis;
• For projects exceeding the standard, adopt a strategy combining source control and terminal treatment;
• Promote the use of pollution-resistant crop varieties to reduce reactions to highly sensitive pollutants.

GB 5084-2021 Referenced Document

• GB 11889 Water quality-Determination of auiline compounds-Spectrophotometric method with N-(1-naphthyl)echylenediamine
• GB 11896 Water quality-Determination of chioride-Silver nitrate titration method
• GB 11901 Water quality-Determination of suspended substance-Gravimetric method
• GB 11912 Water quality-Determination of nickel-Flame atomic absorption spectrophotometric method
• GB 13195 Water quality-Determination of water tecuperature-Thermometer or reverging thermometer method
• GB 20922 The reuse of urban recycling water.Quality of farmland irrigation water
• GB 7467 Water quality-Determination of chromiun(Ⅵ)-1,5 Dtphenylcarbohydrazide spectrophotometric method
• GB 7475 Water quality-Determination of copper,zinc,lead and cadmium-Atomlc absorption spectrometry
• GB 7484 Water quality-Determination of fluoride-Ion selective electrode method
• GB 7494 Water quality-Determination of anionic surfactants-Methylene blue spectrophotometric method
• GB/T 15505 Water quality--Determination of selenium--Graphite furnace atomic absorption spectrometric method
• GB/T 16489 Water quality--Determination of sulfide--Methylene blue spectrophotometric method
• HJ 1048 Determination of 17 Aniline Compounds in Water Quality by Liquid Chromatography-Triple Quadrupole Mass Spectrometry
• HJ 1067 Water quality-Determination of benzene and its analogies-Headspace/gas chromatography
• HJ 1147 Electrode Method for Determination of pH Value of Water Quality
• HJ 347.2 Determination of Water Quality Fecal Coliforms by Multi-Tube Fermentation
• HJ 484 Water quality.Determination of cyanide.Volumetric and spectrophotometry method
• HJ 485 Water quality.Determination of copper.Sodium diethyldithiocabamate spectrophometric method
• HJ 486 Water quality.Determiantion of copper.2,9-Dimethy-1,10-phenanthroline spectrophotometric method
• HJ 487 Water quality.Determination of fluoride.Visual colormetry with zirconium alizarinsulfonate
• HJ 488 Water quality.Determination of fluoride.Fluorine reagents spectrophotometry
• HJ 503 Water quality.Determination of volatile phenolic compounds.4-AAP spectrophotometric method
• HJ 505 Water quality.Determination of biochemical oxygen demand after 5 days(BOD)for dilution and seeding method
• HJ 592 Water quality.Determination of nitrobenzene-compounds by gas chromatography
• HJ 597 Water quality- Determination of total mercury -Cold atomic absorption spectrophotometry
• HJ 621 Water quality.Determination of chlorobenzenes.Gas chromatography
• HJ 637 Water Quality Determination of Petroleum and Animal and Vegetable Oils Infrared Spectrophotometry
• HJ 639 Water quality.Determination of volatile organic compounds.Purge and trap/gas chromatography-mass spectrometer
• HJ 648 Water quality.Determination of nitroaromatics by gas chromatography
• HJ 686 Water quality.Determination of volatile organic compounds.Purge and trap/gas chromatography
• HJ 694 Water Quality-Determination of Mercury，Arsenic，Selenium，Bismuth and Antimony -Atomic Fluorescence Spectrometry
• HJ 700 Water quality.Determination of 65 elements.Inductively coupled plasma-mass spectrometry
• HJ 716 Water quality.Determination of nitroaromatics.Gas chromatography mass spectrometry
• HJ 775 Water quality Ascarid ova determination Nature sedimentation method
• HJ 776 Water quality – Determination of 32 elements-Inductively coupled plasma optical emission spectrometry
• HJ 806 Water quality – Determination of acrylonitrile and acrolein – Purge and trap / gas chromatography
• HJ 810 Water quality –Determination of volatile organic compounds – Headspace / Gas chromatography mass spectrometry
• HJ 811 Water quality―Determination of total selenium―3,3′-Diaminobenzidine spectrophotometric method
• HJ 822 Water Quality Determination of Aniline Compounds Gas Chromatography-Mass Spectrometry
• HJ 823 Water quality-Determination of cyanide-Flow injection analysis（FIA）and spectrophotometric method
• HJ 824 Water quality-Determination of sulfide-Flow injection analysis（FIA）and methylene blue spectrophotometric method
• HJ 825 Water quality-Determination of volatile phenols-Flow injection analysis（FIA）and 4-AAP spectrophotometric method
• HJ 826 Water quality-Determination of anionic surfactants - Flow injection analysis(FIA) and methylene blue spectrophotometric method
• HJ 828 Water quality-Determination of the chemical oxygen demand-Dichromate method
• HJ 84 Water Quality-Determination of Inorganic Anions（F-、Cl-、NO2-、Br-、NO3-、PO43-、SO32-、SO42-）-Ion Chromatography
• HJ 908 Water quality—Determination of chromium(VI)—Flow injection analysis(FIA) and diphenylcarbazide spectrometric method
• HJ 970 Water Quality Determination of Petroleum by UV Spectrophotometry (Trial)
• HJ/T 200 Water quality - Determination of sulfide Gas-phase molecular absorption spectrometry
• HJ/T 343 Water quality. Determination of chloride. mercury nitrate titration
• HJ/T 399 Water quality- Determination of the chemical oxygen demand - Fast digestion-spectrophotometric method
• HJ/T 49 Water quality.Determination of boron curcumin.spectrophotometric method
• HJ/T 50 Water quality.Determination of trichloro-aldehyde.3-methyl-1-phenyl-5-pyrazolone spectrophotometric method
• HJ/T 51 Water quality.Determination of total salt.Gravimetric method
• HJ/T 74 Water quality-Determination of Chlorobenzene-Gas chromatography
• NY/T 396 Procedural regulations regarding the environment quality monitoring of water for agricultural use

GB 5084-2021 history

• 2021 GB 5084-2021 Standard for irrigation water quality
• 2005 GB 5084-2005 Standards for irrigation water quality
• 1992 GB 5084-1992 Standards for irrigation water quality

GB 5084-2021 Standard for irrigation water quality has been changed from GB 22573-2008 Maximum limits of chlorobenzene,1.2-dichlorobenzene,1.4-dichlorobenzene,nitrobenzene for irrigation water quality.

GB 5084-2021 Standard for irrigation water quality has been changed from GB 22574-2008 Maximum limits of toluene,xylene,cumene,phenol and aniline for irrigation water quality.

Topics on standards and specifications

Standard and Specification