1. GB/T 44998-2024Determination of Nitrates and Nitrites in Surfactants "Ion Chromatography":
- Scope of Application and Importance:This standard specifies the method for determining the residual amounts of nitrates and nitrites in surfactants using ion chromatography. Nitrates and nitrites may be present as impurities or by-products in surfactant raw materials or finished products, and excessive residues could affect product safety or stability. This method provides a unified and standardized technical basis for monitoring and improving the purity of surfactants.
- Principle of the method:Ion chromatography is a highly efficient technique for separating and detecting ions. After appropriate pretreatment, the sample is injected into the chromatograph, where the mobile phase carries the target nitrate and nitrite ions into the separation column for isolation. Subsequently, qualitative and quantitative analysis is performed using a detector, such as a conductivity detector. This method offers advantages such as high sensitivity, excellent selectivity, and the ability to simultaneously analyze multiple ions.
2. GB/T 45000-2024"Surfactant" Composition Analysis of Sucrose Fatty Acid Esters "Liquid Chromatography Method":
- Scope of Application and Importance:Sucrose fatty acid esters (sucrose esters) are safe, non-toxic, and biodegradable non-ionic surfactants widely used in the food, cosmetics, and pharmaceutical industries. Their performance is closely related to their composition (the ratio of monoesters, diesters, triesters, and polyesters). This standard employs liquid chromatography for precise analysis of the various components of sucrose esters.
- Principle of the method:High Performance Liquid Chromatography (HPLCSeparation is achieved by utilizing the differences in distribution coefficients of various components between the stationary and mobile phases. For sucrose esters, by selecting appropriate chromatographic columns and detection conditions, components with different degrees of esterification can be effectively separated, and their relative contents can be calculated. This provides critical data for product quality control and application research.
The issuance and implementation of these national standards signify the further improvement of China's analytical and testing system for surfactants. They provide authoritative and unified testing methods for manufacturers, quality inspection agencies, and researchers, playing a crucial supporting role in ensuring the quality and safety of surfactants and their downstream products, promoting technical exchanges and fair trade, and guiding the industry toward high-quality and refined development.