HJ/T 173-2005 in English
SUPERSEDEDTechnical specifications for development of environmental reference materials
- Issued on:2005-03-24
- Implemented on:2005-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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本规范规定了环境标准样品研复制策划、均匀性和稳定性研究与检验、测定、特性量值评定、证书与标签制作、包装、贮存与运输等过程的基本技术要求，主要适用于环境标准样品研复制及其技术管理工作。
Introduction
Analysis of the core content of the standard
This specification establishes a full life cycle technical management system including artificially synthesized environmental standard samples and natural matrix environmental standard samples, with a focus on standardizing:
| Technical links | Requirements for artificially synthesized samples | Requirements for natural matrix samples |
|---|---|---|
| Raw material control | Purity verification of chemical reagents | Representative collection of environmental samples |
| Preparation method | Batch/single piece preparation | Special processing technology |
| Value determination method | Independent determination by the research and development unit | Collaborative determination by multiple laboratories |
Detailed explanation of key technical requirements
1. Uniformity control system
The specification requires the use of two-dimensional inspection: the uniformity between bottles is evaluated by variance analysis for batch consistency (sampling size ≥ 10 units), and the uniformity within the bottle determines the minimum sampling size. The test results are divided into three levels:
- Uncertainty of inhomogeneity
- Uncertainty of inhomogeneity > Expected target → Judged as unqualified
- Between the two → Included in the synthetic uncertainty
2. Stability assurance measures
Case:Water quality standard samples need to be subjected to:
- Long-term stability: Store at 25℃ away from light for 12 months, the value change is ≤2%
- Transport stability: Simulate vibration test for 72 hours
Standard implementation recommendations
Laboratory application guidelines
Note when using environmental standard samples:
- Verify the correspondence between the certificate number and the batch number
- Verify whether the expanded uncertainty (k=2) meets the method requirements
- Strictly store in accordance with the storage conditions on the label
Key points for compliance of research and development institutions
A quality system that complies with GB/T 15000.7 must be established, with the following key points:
- Periodic calibration records of measuring instruments
- Original records of fixed value data must be kept for ≥10 years
- Stability monitoring plan
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