1. Qualitative and quantitative analysis of textile additive elements. For non-metallic metal elements, in most cases, attempts are made to decompose the sample, convert the tested elements into ions, and identify them separately. The sample was melted with sodium and decomposed with oxygen. Bottle burning method.

For the analysis of ions, textile auxiliaries mainly use characteristic reactions in qualitative analysis, including separation reactions and identification reactions. All reactions must be complete, rapid, and selective, and textile auxiliaries must have distinct external characteristics for identifying the reaction. Such as the formation or dissolution of sediment, changes in solution color, emission of special gases, and generation of special odors.

Quantitative analysis of elements, the main elements determined by quantitative analysis are carbon, hydrogen, nitrogen, sulfur, phosphorus, silicon, etc. Quantitative analysis of carbon and hydrogen using Libi's method; Perform nitrogen analysis according to the Duma method and treat phosphorus using the quinolone weight method. The widely used elemental analysis method is the elemental analyzer, which can directly obtain the contents of C, H., N, S, and O.

2. Titration analysis of textile auxiliaries includes acid-base titration, coordination titration, redox titration, gravimetric analysis, and precipitation titration, all of which are chemical quantitative methods. The combination of these methods can be used to analyze textile auxiliaries with pure inorganic components.

3. Chemical identification of textile auxiliaries. Qualitative identification of surfactants is usually based on color changes of dyes, solvent extraction, precipitation, or turbidity.