HJ 764-2015 in English
VALIDSpecifications ans Test Procedures for Automatic/On-line Monitoring of Arsenic in Water
- Issued on:2015-10-22
- Implemented on:2015-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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本标准规定了砷水质自动在线监测仪的技术要求、性能指标及检测方法。
本标准适用于砷水质自动在线监测仪的生产设计、应用选型和性能检测。
针对应用于不同场合的砷水质自动在线监测仪，规定了两型仪器的检测范围。
I型仪器的检测范围为：0.01~0.2 mg/L，主要应用于地表水、地下水和饮用水等的监测。
II型仪器的检测范围为：0.2~1.0 mg/L，主要应用于生活污水和工业废水等的监测。
Introduction
Interpretation of the core content of the standard
The HJ 764-2015 standard is aimed at the technical specifications of the Automatic online monitoring instrument for arsenic water quality, and for the first time established a unified technical framework for online monitoring of arsenic in my country. The standard divides the instrument into two categories: Type I (0.01-0.2mg/L) and Type II (0.2-1.0mg/L), which are suitable for different pollution scenarios.
Key technical requirements
| Functional module | Technical requirements | Implementation points |
|---|---|---|
| Sampling/metering unit | Anti-corrosion material, metering error ≤1% | Peristaltic pump needs to be calibrated regularly to avoid crystallization of pipelines |
| Digestion unit | High temperature and high pressure digestion efficiency ≥95% | Temperature control accuracy needs to reach ±2℃ |
| Analysis unit | RSD≤3% (0.5mg/L standard solution) | Photoelectric calibration is required every month |
Detailed explanation of performance indicators
Comparison of key indicators
Take Type I instrument as an example: The lower limit of quantification is 0.01mg/L, which requires the use of a high-sensitivity detector (such as atomic fluorescence); The memory effect is ≤10%, which requires a three-level flushing system; The minimum maintenance period is 168 hours, which corresponds to a reagent storage volume of ≥500mL.
Key points for the implementation of the detection method
- Indication error detection: NIST traceable standard materials are required
- Ion interference test: Pay special attention to the interference of Sb³⁺ at 0.1mg/L
- Actual water sample comparison: It is recommended to collect water samples with different matrices (surface water/electroplating wastewater)
Standard evolution analysis
Compared with the GB/T 7485 laboratory method, the innovation of HJ 764-2015 is reflected in: For the first time, the environmental adaptability indicators of online instruments are specified (working range of -40℃~50℃), a data validity evaluation system is established (≥90% efficiency), and a remote quality control function is introduced (in compliance with the HJ/T 212 protocol).
Implementation recommendations
- Selection recommendations: Drinking water sources should give priority to Type I instrument, equipped with a low-temperature preprocessor
- Operation and maintenance points: UV lamp intensity should be tested every quarter, with annual drift ≤15%
- Data review: Focus on data continuity when switching ranges
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