SN/T 4896-2017 in English
VALIDTest method of vapour pressure for dangerous chemicals
- Issued on:2017-08-29
- Implemented on:2018-04-01
- File Format:PDF
- Delivery:Via email within 5 business days
$369.00
Introduction
Standard Background and Technological Evolution
This standard is based on the technical framework of the OECD Test Guide 104 (1981) and the EU EC Directive (1992), integrating the vapor pressure measurement technology achievements of institutions such as BASF in the range of 10-10 Pa to 105 Pa. The 2017 revision added modern measurement techniques such as rotary evaporation and thermogravimetric analysis.
Comparison of Core Test Methods
| Method Type | Range(Pa) | Accuracy Error | Applicable Materials |
|---|---|---|---|
| Static Method | 103-105 | ±1% | Low Volatility Liquids |
| Dynamic Method | 10-3-1 | ±5% | Solid Chemicals |
| Isotonometric Method | 10-10-103 | ±10% | Highly dangerous substances |
Key instrument requirements
The standard stipulates three types of core equipment:
- Vapor pressure balance instrument: Requires to be equipped with ±0.1℃ temperature control system
- Vacuum system: Ultimate vacuum degree ≤10-3 Pa
- Pressure sensor: Range coverage 10-5-105 Pa
Temperature control specifications
The test must be carried out in the standard temperature range of 0-50℃, and for special substances it can be extended to 120-150℃.
Implementation suggestions
Case: The test of pesticide cypermethrin showed that the vapor pressure measured at 25℃ by the static method was 2.3×10-5 Pa, which deviated by 15% from the result of the dynamic method. Kinetic energy correction was required using formula (3).
Error control: When the pressure is less than 10-3 Pa, the free path effect of gas molecules needs to be considered and corrected according to the Knudsen equation:
p = G√(2πRT/M)×10-3
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