SN/T 5315-2021 in English
VALIDTest method of photocatalytic ceramics for self-cleaning - Fluorescence probe method
- Issued on:2021-11-22
- Implemented on:2022-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$127.00
Introduction
Analysis of the core content of the standard
This standard uses a fluorescence spectrophotometer to measure the fluorescence intensity of 2-hydroxyterephthalic acid generated by photocatalytic ceramics, and calculates the photocatalytic activity index R by establishing an If-t linear relationship. Key technologies include:
| Key parameters | UV test | Visible light test |
|---|---|---|
| Light source requirements | Dominant wavelength 365nm UV lamp | Color temperature 5000K fluorescent lamp |
| Light intensity | 1.0-5.0 mW/cm² | 1200-6000 lx |
| Filter type | UV transmittance filter | UV cutoff filter |
Test Principle and Technology Evolution
Based on the characteristic of hydroxyl radicals (·OH) reacting with terephthalic acid to generate fluorescent substances, compared with the traditional degradation rate test method, it has the following advantages:
- Sensitivity is improved by 103 times
- Lower limit of detection can reach 10-8 mol/L
- In-situ real-time monitoring is achieved
Critical Control Points of Sample Preparation
The 60×60mm sample prepared by the cutting machine needs to be cleaned in three steps:
- Surface particles are rinsed with deionized water
- Oil is removed with organic solvent
- Deep cleaning with UVC lamp for 4-24h
Typical case: A company did not perform the third step of pretreatment, resulting in a test result deviation of 32%.
Implementation suggestions and precautions
1. Environmental control: Maintain a constant temperature of 23±2℃. It is recommended to use a constant temperature and humidity chamber
2. Data validity verification: When the linear correlation coefficient R²<0.95, it is necessary to:
- Check the stability of the light source
- Recalibrate the fluorescence photometer
- Verify the freshness of the reagents
3. Special-shaped parts testing: 3D printing can be used to customize the test tank to ensure sealing

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