Method for measuring liquid phase ozone concentration by flow injection ozonation

Abstract

The invention provides a method for measuring liquid phase ozone concentration by flow injection ozonation, which solves the problems of measurement result error caused by selection of traditional trapping agents and interference of metal ions in matrix water samples, and secondary pollution in the prior art. The method comprises the following steps: (1) conveying an ozone solution to be detected through a pump; (2) mixing the ozone solution with a tertiary butanol solution in a tertiary butanol pipeline; (3) mixing with a luminol solution in a luminol pipeline and a metal-chelator solution in a metal-chelator solution pipeline, detecting chemiluminescent signals generated by ozone molecules and luminol in the mixed solution by a photomultiplier; (4) collecting and amplifying the optical signals, converting into electric signals, sending the electric signals into a computer data processing system, calculating the liquid phase ozone concentration, displaying, and printing for output. The tertiary butanol is adopted to eliminate interference on luminol ozonation caused by traditional trapping agents; the metal-chelator is adopted for complexation with metal ions in the water, and the generated metal complex does not catalyze chemiluminescence of luminol.

Description

technical field [0001] The invention belongs to the technical field of environmental chemical monitoring, specifically based on the phenomenon that luminol can be oxidized by ozone to produce chemiluminescence, using flow injection technology to produce chemiluminescence through blank solution and measured water sample-ozone solution A method of measuring the concentration of ozone in the liquid phase by the difference in intensity. Background technique [0002] The wide application of ozone generators makes the liquid phase ozone concentration (DO 3 ) measurement is very important. At present, the commonly used methods include iodometric method, ultraviolet spectrophotometric method and indigo method, and they have their own advantages and disadvantages. For example, the iodometric method has high detection sensitivity, but most of the coexisting oxidants interfere, and the reaction chemical dosage is controversial; the ultraviolet spectrophotometric method has high detec...

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method for measuring liquid-phase ozone concentration by means of flow injection ozone oxidation. On the one hand, it can solve the problems of long duration, complicated analysis process, harsh conditions, poor stability and ion interference in the existing analysis technology. On the one hand, it can also solve the problem of the selection of traditional capture agents in the prior art and the interference of metal ions in matrix water samples, which cause errors in measurement results, etc., especially the problem of secondary pollution

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