High Performance Liquid Chromatography Ultraviolet Detection

Detection Principle

Eluted compounds pass through a flow cell positioned in the path of a ultraviolet light beam. Organic molecules containing conjugated double bonds absorb specific wavelengths of light, causing a decrease in light intensity reaching the photodetector. This change in absorbance is plotted against elution time to generate a characteristic chromatogram.

The resulting peak areas correspond directly to the concentration of each chemical species present in the extract.

Textile Assessment

Testing facilities utilize this analytical tool to verify the concentration of restricted dyes and finishing agents on apparel fabrics. Solvents are used to extract these compounds from the garment before analysis. The system determines whether trace quantities of restricted substances, such as disperse dyes or chemical softeners, are within safe consumer limits.

This capability is necessary for brands that must comply with global ecotoxicity standards.

Quality Assurance

Compliance with international safety regulations requires continuous verification of yarn and fabric treatments before goods are shipped to retail markets. If residual azo dyes are detected, the batch is rejected to prevent skin irritation issues for the consumer. Continuous monitoring maintains brand reputation and prevents costly product recalls.

This process ensures that chemicals applied during textile manufacture have been thoroughly washed out or held to acceptable levels.