GB/T 35755-2017 in English
VALIDSurfactants and detergents―Determination of formaldehyde contents
- Issued on:2017-12-29
- Implemented on:2018-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
《GB/T 35755-2017表面活性剂和洗涤剂 甲醛含量的测定》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
1. Background and significance of the standard
GB/T 35755-2017 aims to standardize the determination method of formaldehyde content in surfactants and detergents to ensure product quality and safety. The standard was proposed by the China Light Industry Federation and is managed by the National Technical Committee for Standardization of Surfactants and Detergents.
2. Overview of determination methods
This standard specifies two methods for determining formaldehyde content: spectrophotometry (applicable to total formaldehyde, including formaldehyde emitters) and liquid chromatography (applicable to free formaldehyde). The following is a detailed interpretation of the two methods:
| Comparison Dimensions | Spectrophotometry | Liquid Chromatography |
|---|---|---|
| Principle | Formaldehyde reacts with acetylacetone to form a yellow complex, and the absorbance is measured by a spectrophotometer. | Formaldehyde is separated by a liquid chromatography column and detected at 410nm with a UV detector. |
| Reagent Requirements | Acetylacetone, ammonium acetate, etc. | Phosphate buffer solution, ammonium acetate, etc. |
| Instruments and Equipment | Spectrophotometer (wavelength range 360nm~800nm). | Liquid chromatograph (with UV detector or diode array detector). |
| Applicable Scenarios | Rapid screening of total formaldehyde content, suitable for routine laboratory testing. | High-precision free formaldehyde determination, suitable for separation and analysis of complex samples. |
3. Practical Application Cases
Case 1: Practical Operation Steps of Spectrophotometry
- Prepare formaldehyde working solution.
- Draw a standard curve and ensure that the correlation coefficient is greater than 0.999.
- After sample treatment, absorbance was measured to check the formaldehyde content.
Case 2: Advantages of liquid chromatography
- Use phosphate buffer solution to optimize mobile phase conditions.
- Post-column derivatization device improves detection sensitivity.
- Applicable to the analysis of detergent samples containing complex components.
4. Implementation suggestions
In actual operation, it is recommended to use spectrophotometry for preliminary screening, and liquid chromatography should be used for occasions with high precision requirements. At the same time, the laboratory should be equipped with corresponding instruments and equipment, and calibrated regularly to ensure the accuracy of the test results.
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