WS/T 535-2017 in English

Interpretation of the core content of the standard

This standard systematically standardizes the on-site rapid detection technology system for commonly used disinfectants in medical and health institutions for the first time, which mainly includes two detection methods:

Analysis of key technical requirements

4.1 Semi-quantitative determination method with test paper

The operating procedure strictly follows the three steps of immersion-colorimetry-judgment:

1. The sample needs to be balanced at 25℃±2℃
2. The test paper immersion time is controlled according to the instructions (usually 30-60 seconds)
3. Colorimetry should be carried out immediately under natural light

Implementation Recommendations

Key Points for Quality Control

• Test strips should be stored in a dark environment with a humidity of <60%.
• Acidic oxidation potential water detection requires three consecutive measurements after the water outlet stabilizes.
• Temperature correction is required when measuring using the ethanol specific gravity method (see Appendix B).

Analysis of Standard Evolution

Compared with the 2002 version of the Technical Specifications for Disinfection, this standard adds the following:

• Detection methods for new disinfectants such as o-phthalaldehyde.
• Standardized operating procedures for on-site rapid detection instruments.
• Clear criteria for determining limit values for different disinfectants.