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GB/T 24800.13-2009: Determination of nitrite in cosmetics by ion chromatography method
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GB/T 24800.13-2009: Determination of nitrite in cosmetics by ion chromatography method

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Determination of nitrite in cosmetics by ion chromatography method ICS 71.100.70 Y42 National Standards of People's Republic of China Determination of Nitrite in Cosmetics Ion Chromatography Posted 2009-11-30 2010-05-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

Appendix A of this standard is an informative annex. The standard proposed by China National Light Industry Council. This standard by the National Standardization Technical Committee of Fragrance Flavor and Cosmetic (SAC/TC257) centralized. This standard is drafted by. China Inspection and Quarantine Science Research Institute, Shanghai Institute of spices. The main drafters of this standard. Wang Chao, Wu Ting, Xiao Haiqing, Ma Qiang, Xi Guangcheng, Wang Xing, Li Qiong, SHEN Min.

Introduction

Inorganic nitrite (except sodium nitrite, sodium nitrite is used as a rust inhibitor to allow, limit the amount of 0.2%) is China's "cosmetic Wei Health specifications "provisions of banned substances, namely the component can not be added to cosmetics as a cosmetic raw material. If technically unavoidable disabled Matter as the impurities into cosmetics, the finished cosmetic products should meet the "Hygienic Standard for Cosmetics" General requirements for the cosmetics, that is normal and Under reasonably foreseeable conditions of use, should not cause harm to human health. At present, China has not yet specified limit values for these substances. The standards, only the determination of these substances in cosmetics to provide detection methods. Determination of Nitrite in Cosmetics Ion Chromatography

1 Scope

This standard specifies the method for the determination of nitrite in cosmetic. This standard applies to skin care cosmetics Determination of Nitrite. The standard for nitrite detection limit of 0.000025% limit of quantification was 0.00005%. Principle 2 Acetonitrile as demulsifiers, high-speed oscillation, centrifuged, the supernatant was diluted after ultra-pure water, over 0.22μm nylon membrane and RP column (or C18 column), the solution was injected with a conductivity detector for ion chromatography detection, external standard.

3 Reagents and materials

Unless otherwise specified, reagents were of analytical grade. 3.1 water. ultra pure water. 3.2 Nitrite standard solution. national standard stock solution kept refrigerated in the refrigerator, you can use two months. 3.3 Nitrite standard solution. water above the standard solution (3.2) respectively dubbed 0.1mg/L, 0.2mg/L, 0.5mg/L, 1.0mg/L concentration range of the standard working solution, using now.

4 Instrument

4.1 ion chromatograph equipped with digital conductivity detector. 4.2 Vortex. 4.3 ultrasonic cleaner. 4.4 Centrifuge, greater than 5000r/min. 4.5 solvent filter and 0.22μm nylon filter. 4.6 plug colorimetric tube, 10mL. 4.7 RP column or a C18 column, 1mL. NOTE. RP column or a C18 column activated before use. 5mL methanol, respectively, after 10mL water-activated, can be used after placement 30min.

5 measuring step

5.1 Sample Preparation Weigh cosmetic samples about 2.0g, accurate to 0.001g, with plug in 10mL colorimetric tube, add acetonitrile to volume, vortex vibration On the high-speed oscillator oscillation 1min after the centrifuge at 6000r/min centrifugal 20min, supernatant 1mL to 10mL colorimetric tube, Plus ultra-pure water to the mark, followed by 0.22μm nylon membrane, after RP column (or C18 column), and the filtrate for measurement. 5.2 Determination 5.2.1 Chromatographic conditions 5.2.1.1 Column. anion exchange column, 4mm × 250mm (with 4mm × 50mm guard column); 5.2.1.2 eluent. 4.5mmol/LNa2CO3 + 1.4mmol/LNaHCO3; 5.2.1.3 flow rate. 1.0mL/min; ...