Method for detecting detergent residue on fabric by liquid chromatography

Abstract

The invention relates to a method for detecting detergent residue on a fabric by liquid chromatography, which establishes an experimental model and directly detects the detergent residue on the fabric, and has the effects of high accuracy, high reliability and wide applicability. The method for detecting the detergent residue on the fabric by the liquid chromatography comprises the following steps: 1) preparation of a diluent: in the diluent, 50 grams of sodium dihydrogen phosphate dihydrate (NaH<2>PO<4> 2H<2>O) and 6.8 mL of sulfuric acid (the density is 1.84 g / mL) are contained in 1000 mL ofthe diluent; 2) preparation of a derivatization reagent methylene blue solution: weighing 10 to 100mg methylene blue in a 1000mL volumetric flask, and metering the volume to a scale with the diluentfor use; 3) preparation of an anionic surfactant standard solution: weighing 10 to 100 mg of anionic surfactant standard sample in a 1000 mL volumetric flask, diluting to the scale with ultrapure water as a mother liquor, and preparing standard solutions of different concentrations for use; 4) drawing of an anionic surfactant correlation curve; and 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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