Automatic analyzer for anionic surfactant in water and automatic analysis method

Abstract

The invention discloses an automatic analyzer for an anionic surfactant in water, which comprises an automatic sampling device, a peristaltic pump, a detector and a sample processing assembly, wherein the sample processing assembly comprises a sample filling valve, knotted reactors, a three-way valve, a four-way valve, chemically inert microporous hydrophobic film on-line extraction modules, and a capillary connecting pipe; and one port of the sample filling valve is connected with a flask for carrying current, and the other port is orderly connected with a first knotted reactor, a first chemically inert microporous hydrophobic film on-line extraction module, a second knotted reactor, a second chemically inert microporous hydrophobic film on-line extraction module, the four-way valve, a flow cell, the detector and a computer processing system. The automatic analyzer can continuously and automatically test samples, has high test speed, the frequency of detecting samples of 18 samples / hour, high test sensitivity and good test accuracy, and uses the on-line double extraction modes to have strong interference resistance; and most inorganic ions such as SCN-, CN-, NO3-, Cl-, F-, Br- and the like are not interfered when the concentration is 1,000mg / L.

Description

technical field [0001] The invention relates to an analysis of anionic surfactants in water, in particular to an automatic analyzer for measuring anionic surfactants in water by flow injection colorimetry and an automatic analysis method for anionic surfactants in water. Background technique [0002] Anionic surfactants in water will cause foams that are not easy to disappear on the water surface and consume dissolved oxygen in the water, thus affecting water quality. Therefore, anionic surfactants have become a must-check item in drinking water and environmental testing. At present, the detection method of anionic surfactants is the methylene blue spectrophotometric method adopted in accordance with the national standard (GB / T5750.4-2006): the sample containing anionic surfactants is reacted with methylene blue to generate a blue compound, which is extracted with chloroform Finally, the absorbance value is measured at 650nm, which is correlated with the concentration of the...

AI Technical Summary

Problems solved by technology

However, most of the methods are not based on national standards, and the sensitivity of the methods cannot meet the actual measurement needs. Most of the extraction phase separators used cannot be applied to actual work due to poor reproducibility and long-term stability.

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