A liquid chromatography method for detecting detergent residues on fabrics

Abstract

The invention provides a method for detecting detergent residues on fabrics by liquid chromatography, which establishes an experimental model to directly detect detergent residues on fabrics, and has the effects of high accuracy, strong reliability and wide applicability. The steps of the method of the present invention are: 1) preparation of diluent: diluent: 1000mL volume containing sodium dihydrogen phosphate dihydrate (NaH 2 PO 4 2H 2 O) 50g, 6.8mL sulfuric acid (ρ=1.84g / mL); 2) Preparation of derivatization reagent methylene blue solution: Weigh 10-100mg methylene blue in a 1000mL volumetric flask, and dilute to the scale with diluent for later use; 3) Anion surface Preparation of active agent standard solution: Weigh 10-100mg of anionic surfactant standard sample into a 1000mL volumetric flask, dilute it to the mark with ultrapure water, and use it as mother liquor to prepare standard solutions of different concentrations for later use; 4) Draw the anionic surfactant Agent correlation curve: 5) Sample detection.

Description

technical field [0001] The invention relates to a method for detecting detergent residue on fabrics by liquid chromatography. Background technique [0002] In daily life, people use a lot of detergents. With the improvement of the quality of life, people's awareness and requirements for safety and environmental protection are also increasing. They are also paying more and more attention to the detergent residue on the clothes after washing. The formula composition of laundry detergent is generally in the following formula: Anionic surfactants and nonionic surfactants are dominant, and zwitterionic surfactants, alkyl glycoside surfactants, etc. may also be added. According to the performance analysis of surfactants, anionic surfactants are more irritating than other surfactants and are not easy to rinse, so it is representative to choose anionic surfactants as the detected residues. In addition, the classical detection methods for surfactants such as non-ionic, zwitterionic,...

AI Technical Summary

Problems solved by technology

[0003] Some colorimetric methods detect the total amount of anionic surfactants, such as the patent CN102692412A "A Quick Detection Kit for Anionic Surfactants and Its Detection Method", which can only determine the concentration range of the sample and cannot be accurately quantified, which belongs to the semi-quantitative category

There are also some methods to test the rinse water, but there is no residual surfactant in the rinse water, which does not mean that there is no residue on the fabric

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