GB/T 38731-2020 in English
VALIDSurface active agents—Test methods of technical sodium secondary alkylsulphates
- Issued on:2020-04-28
- Implemented on:2020-11-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 38731-2020表面活性剂 工业仲烷基硫酸钠试验方法》由TC272（全国表面活性剂和洗涤用品标准化技术委员会）归口，主管部门为中国轻工业联合会。
Introduction
Analysis of the core content of the standard
This standard specifies the detection methods of 9 key indicators of industrial secondary alkyl sodium sulfate, focusing on solving the quality control problem of sulfur-containing surfactants. Compared with ISO 895:1977, the main technical adjustments involve 12 adaptive modifications such as ethanol concentration and petroleum ether boiling range.
Comparison of key technical differences
| Test items | ISO 895:1977 | GB/T 38731-2020 | Modification points |
|---|---|---|---|
| Determination of water content | ISO 4317 method | GB/T 11275-2007 7.2 | Azeotropic distillation method |
| Sodium chloride determination | ISO 6227 method | GB/T 3050 potentiometric titration | Improve detection accuracy |
| Petroleum ether extraction | 40-60℃ boiling range | 30-60℃ boiling range | Adapt to domestic reagent specifications |
Detailed explanation of key detection methods
Determination of petroleum ether extractables
Adopting the three-stage separating funnel alternating extraction technology, through:
- Petroleum ether extraction under alkaline conditions
- Anhydrous sodium sulfate dehydration
- Solvent gradient evaporation
Pay attention to control the washing times ≤5 times, and the constant weight difference of the residue should be ≤1mg.
Implementation Suggestions
- Samples with pH value <7.0 need to be tested immediately to avoid result drift
- Alkaline environment should be maintained throughout the determination of sodium alkyl sulfate
- Petroleum ether extraction uses a 30-60℃ narrow distillation range reagent
Background of Standard Evolution
This standard inherits the ISO 895:1977 framework and targets the characteristics of China's industrial production:
- Delete complex devices such as fractionation columns in the original standard
- Simplify the constant weight operation process
- Add QB/T 2739 reagent preparation standard
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