GB/T 32093-2015 in English
VALIDDetermination of sodium iodate in cosmetics―Ion chromatography
- Issued on:2015-10-09
- Implemented on:2016-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
《GB/T 32093-2015化妆品中碘酸钠的测定 离子色谱法》由TC257(全国香料香精化妆品标准化技术委员会)归口,主管部门为中国轻工业联合会。
本标准规定了化妆品中碘酸钠的离子色谱测定方法。
本标准适用于膏霜、乳液、液体类化妆品中碘酸钠的测定。
本标准方法检出限为0.00005%,定量限为0.0002%。
Introduction
GB/T 32093-2015 Standard Overview
This standard specifies the ion chromatography determination method for sodium iodate in cosmetics, and is applicable to the detection of sodium iodate in creams, lotions, and liquid cosmetics. Its detection limit is 0.00005%, and the quantification limit is 0.0002%.
Background of Standard Formulation
According to my country's "Cosmetic Hygiene Standards", sodium iodate is only allowed to be used in rinse-off products, and the maximum allowable concentration is 0.1%. The formulation of this standard aims to provide a methodological basis for the detection of sodium iodate in non-rinse-off cosmetics.
Principle of the method
| Steps | Operation instructions | Key points |
|---|---|---|
| Sample treatment | Accurately weigh the cosmetic sample, extract and centrifuge it with dichloromethane and ultrapure water. | Pay attention to the effect of the use of anhydrous ethanol on the results. |
| Chromatographic separation | Ion exchange chromatography-conductivity detector is used, and separation is achieved by gradient elution of the mobile phase. | Chromatographic column selection is crucial to the separation effect. |
| Quantitative analysis | External standard method quantification, standard curve drawing must cover the detection range. | Data processing should pay attention to the linear relationship between peak area and concentration. |
Actual application case
In a certain brand of hair conditioner, the concentration of sodium iodate was detected to be 0.05mg/L, which is far below the national standard limit, proving its safety.
Comparative analysis of standard frameworks
| Dimensions | GB/T 32093-2015 | Comparison with international standards |
|---|---|---|
| Detection range | Applicable to creams, lotions, and liquid cosmetics. | Basically consistent with the ISO method, but with more detailed sample processing steps. |
| Detection limit | 0.00005% | Better than the EU standard of 0.0001%. |
| Quantification limit | 0.0002% | Equivalent to the US cosmetics testing method. |
Implementation recommendations
1. The laboratory should be equipped with an ion chromatograph and related equipment that meets the requirements.
2. The preparation conditions of standard stock solutions and intermediate solutions must be strictly controlled.
3. Operators should receive professional training to ensure data accuracy.

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