GB/T 22594-2018 in English
VALIDWater treatment chemicals—General rules for determination of density
- Issued on:2018-06-07
- Implemented on:2019-01-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$136.00
《GB/T 22594-2018水处理剂 密度测定方法通则》由TC63（全国化学标准化技术委员会）归口，TC63SC5（全国化学标准化技术委员会水处理剂分会）执行，主管部门为中国石油和化学工业联合会。
Introduction
Interpretation of GB/T 22594—2018 National Standard of the People's Republic of China
This standard specifies in detail the general method for the determination of the density of liquid water treatment agents, which is applicable to the quality control and testing of a variety of liquid water treatment agent products. Compared with GB/T 22594—2008, the U-type vibrating tube method (see Chapter 5) is newly added, and the original density meter method and density bottle method are optimized.
| Method name | Applicable scenarios | Instruments | Operation steps | Accuracy |
|---|---|---|---|---|
| Densitometer method | Suitable for rapid determination, no need for complex equipment | - Densitometer with a graduation value of $0.001~\mathrm{g/cm^{3}}$ - 250mL~500mL glass measuring cylinder - Constant temperature water bath (temperature controlled at $(20\pm0.1)^{\circ}C$) | 1. Pour the sample to be tested into the measuring cylinder under constant temperature conditions 2. Slowly place the densitometer into the sample and read the scale value under equilibrium state 3. Calculate actual density using temperature correction formula | ±0.001 g/cm³ |
| Density bottle method | High precision requirement, suitable for laboratory environment | - 25cm³~50cm³ density bottle - Constant temperature water bath (temperature controlled at $(20\pm0.1)^{\circ}C$) - Thermometer (division value is $0.1^{\circ}C$) | 1. Use water to calibrate the volume of the density bottle 2. Determine the mass of the sample with the same volume 3. Calculate the sample density by formula, considering the influence of air buoyancy | ±0.001 g/cm³ |
| Density bottle method | High precision requirement, suitable for laboratory environment | - 25cm³~50cm³ density bottle - Constant temperature water bath (temperature controlled at $(20\pm0.1)^{\circ}C$) - Thermometer (division value is $0.1^{\circ}C$) | 1. Use water to calibrate the volume of the density bottle 2. Determine the mass of the sample with the same volume 3. Calculate the sample density by formula, considering the influence of air buoyancy | ±0.001 g/cm³ |
| U-type vibrating tube method | Modern and efficient determination, suitable for automated laboratories | - U-type vibrating tube density meter (accuracy is $\pm0.001~\mathrm{g/cm^{3}}$ - Temperature accuracy is $\pm0.1^{\circ}C$) | 1. Instrument calibration: use standard samples for calibration 2. Inject the sample to be tested into the U-tube and start the measurement 3. The instrument automatically displays and records the measurement results | ±0.001 g/cm³ |
Implementation recommendations and technology evolution analysis
U-type vibrating tube methodAs a new method, it is efficient, accurate and automated, and is particularly suitable for modern laboratories. The following are specific implementation suggestions:
- Equipment selection:Preferably use a U-shaped vibrating tube density meter with high accuracy and good temperature control.
- Calibration steps:Follow the instrument manual and calibrate regularly with standard samples to ensure measurement accuracy.
- Operation specifications:Before injecting the sample, ensure that the U-shaped tube is clean and free of residue, and strictly control the temperature conditions.
- Data processing:Record all measurement results, and it is recommended to establish a data analysis system to improve efficiency and reliability.
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