HJ 91.2-2022 in English

SUPERSEDED

Technical specifications for surface water environmental quality monitoring

Issued on:2022-04-15
Implemented on:2022-08-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $270.00
$262.00

Standard No:	HJ 91.2-2022
Document status:	SUPERSEDED
Superseded by:	HJ/T 91-2002 Technical specifications requirements for monitoring of surface water and waste water
Superseded on:	2003-01-01
Title in English:	Technical specifications for surface water environmental quality monitoring
Title in Chinese:	地表水环境质量监测技术规范
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2022-04-15
Implemented on:	2022-08-01
Superseding:	HJ/T 91-2002 Technical specifications requirements for monitoring of surface water and waste water
Professional Classification:	HJ-Environment
Related Keywords:	overall water quality surface water monitoring section tidal river monitoring river basin monitoringdelete river basin monitoring
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本标准规定了地表水环境质量监测的布点与采样、监测项目与分析方法、监测数据处理、质量保证与质量控制、原始记录等内容。
本标准适用于江河、湖泊、水库和渠道等地表水的水环境质量手工监测。

Introduction

Background of Standard Revision and Technological Evolution

The 2022 version of the standard replaces the surface water monitoring part of HJ/T 91-2002. The main revisions include:

Dimensions	2002 version	2022 version
Appendix system	No special appendix	Added total phosphorus pretreatment (normative appendix A) and sampling record form (informative appendix B)
Monitoring scope	Including river basin monitoring	Delete river basin monitoring and focus on rivers, lakes, reservoirs and channels
Technical details	Basic requirements	Refine the sampling rules for tidal rivers and clarify the salinity 2‰ demarcation standard

Analysis of core technical requirements

4.1 Principles of site layout

The monitoring section setting must meet the following requirements:

Spatial representativeness: reflect the overall water quality of the region (the background section is >5km away from the pollution source)
Technical feasibility: give priority to the use of existing bridges and other structures, and sample at 1/2 the water depth when the water depth is less than 0.5m
Quality control: the control section must cover more than 80% of the total pollution capacity of the river section

TurbidimeterApplication case: When the turbidity of raw water is >500NTU, it is necessary to use 2000r/min centrifugation for 2 minutes to process the total phosphorus sample

5.2 Selection of analytical methods

Priority order:

Methods specified in standards such as GB 3838
Other national/industry standard methods with a detection limit lower than 1/3 of the standard limit
Proven new technologies (record required)

Implementation recommendations

Key points for tidal river monitoring

Special attention should be paid to:

Sampling at low tide (salinity <2‰)
Add a control section upstream of the bridge and lock
Re-deployment of points when qualified samples cannot be obtained for a long time

Key nodes for quality control

Steps	Requirements	Frequency
Sampling equipment blank	Below method detection limit	3% per batch
On-site parallel samples	RSD≤20%	1 group per batch
Full procedure blank	No target detected	1 per batch

More samples: YD/T 3934-2021 JJG 21-2008 JGJ 94-2008

Sample only — not a preview of HJ 91.2-2022

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