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First revision! Main revision contents of HJ/T 166 "Technical Specification for Soil Environmental Monitoring"
Time：
2024-10-24
The Ministry of Ecology and Environment has publicly solicited opinions on the "Technical Specifications for Soil Environmental Monitoring", revising it to include point layout, sampling methods, sample preparation, etc., improving standardization and operability, deleting simple random and block random point layout methods, and adding content such as monitoring plan preparation.
Recently, the Ministry of Ecology and Environment organized the preparation of the draft of the national ecological environment standard "Technical Specification for Soil Environment Monitoring", which is now open for comments. Based on summarizing experience, extensive research, and in-depth study, this revision has redefined the scope of application, modified, supplemented, and improved some technical details, further enhancing standardization and operability to meet the new requirements for environmental monitoring.
Revised the point layout methods for different monitoring units.
Revised the sampling method, improved the surface sampling method for detecting inorganic samples, and supplemented the sampling method for detecting organic samples.
Refined the sample preparation process, supplemented the requirements for sample preparation environment, quality control content, and sample preparation content for detecting organic items.
Improved the construction and management of soil sample banks.
Improved the content of quality assurance and quality control, and updated the evaluation criteria for quality control results.
Revise the main content
HJ/T 166-2004 includes 13 parts: 1 Scope; 2. Reference standards; 3 terms and definitions; 4. Sampling preparation; 5 points and sample quantity; 6 sample collection; 7 Sample circulation; 8 sample preparation; 9. Sample preservation; 10 Soil analysis and determination; 11. Analysis records and monitoring reports; 12. Soil environmental quality assessment; Chapter 13: Quality Assurance and Quality Control.
The original standard content deleted from this standard
The simple random and block random sampling methods in 5 sampling points and sample quantities are generally not adopted in practical work, and it is difficult to grasp the characteristics of soil variability and carry out block random sampling.
In the soil analysis and determination section of "10.2 Sample Processing", the analysis method specifies the requirements for sample pretreatment, and the corresponding requirements can be executed according to the selected analysis method.
12. Soil environmental quality assessment, relevant standards will be separately issued.
13 Quality Assurance and Quality Control
(1) 13.2.4 Soil standard samples "is a general common sense term and has been specified in the" Soil Environment Vocabulary "(HJ 1231-2022) [19].
(2) The HJ/T 166-2004 document "13.2.5 Handling of Interference during Monitoring" mainly requires retesting in case of sudden objective situations. The "Technical Guidelines for Quality Management of Environmental Monitoring" (HJ 630-2011) [20] and analytical method standards have refined the inspection requirements for instrument quantitative calibration, calibration curves, instrument stability, etc., and also include the handling of interference in the detection process.
(3) The main requirement of HJ/T 166-2004, "13.3 Inter laboratory Quality Control," is to conduct inter laboratory comparisons and proficiency testing activities to ensure data reliability. Relevant provisions have been made for external quality control in the Technical Guidelines for Environmental Monitoring Quality Management (HJ 630-2011) [20].
(4) 13.5 Determination Uncertainty "has been specified in the" Evaluation and Representation of Measurement Uncertainty "(GB/T 27418-2017) [21].
The main content added to this standard
Preparation of monitoring plan
Division of monitoring units
On site verification at designated locations
Point confirmation
Collection of volatile organic compounds samples
Environmental requirements for sample preparation
Preparation of samples for organic testing projects
Quality assurance and quality control at each stage
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