Fast online pH value detecting device and method based on absorption spectrums

Abstract

The invention discloses a fast online pH value detecting device and method based on absorption spectrums. The detecting device comprises a micro mixer, a circulating device, a light source, optical fibers, a photodiode array detector and a computer processing system. In the working process, liquid, with different pH values, to be detected and an indicator are mixed fast and efficiently by means of the micro mixer, mixed liquor flows into the circulating device, and ultraviolet visible light emitted by the light source is received by the photodiode array detector after penetrating through the circulating device. The ultraviolet visible light is read for converting light signals into electrical signals fast to obtain absorbance values of different wave lengths, the pH values of the solutions to be detected are obtained by means of data processing, and the pH values are displayed on the computer processing system. Compared with the prior art, the detecting device has the advantages that a non-contact mode is adopted in detection, pollution is not caused easily, detection is simple, efficient, stable and high in precision, and fast online detection of the pH values of the strong electrolyte water solution is achieved; the detecting device is used for tracing the fast reaction process and is conductive to study of a reaction mechanism.

Description

technical field [0001] The invention relates to online pH value detection equipment, in particular to a device and method for fast online detection of pH value based on absorption spectrum. Background technique [0002] The pH value of a solution is an important physical and chemical parameter that characterizes the acidity and alkalinity of a solution. In the fields of industrial process control, agriculture, medicine, bioengineering, and environmental monitoring, the measurement and control of the pH value of a solution plays an important role. [0003] Most of the existing traditional pH measurement technologies use pH glass electrodes to measure, but the pH glass electrodes are large in size, fragile, inconvenient to store and use, and are contact detection, easy to be polluted, and the response time is slow; in addition, it The test value of the low ionic strength system is unstable, and it is susceptible to electromagnetic and radio frequency interference, so it canno...

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Problems solved by technology

[0003] Most of the existing traditional pH measurement technologies use pH glass electrodes to measure, but the pH glass electrodes are large in size, fragile, inconvenient to store and use, and are contact detection, easy to be polluted, and the response time is slow; in addition, it The test value of the low ionic strength system is unstable, susceptible to electromagnetic and radio frequency interference, and cannot be quickly and accurately determined

Compared with the traditional pH glass electrode, the photometric pH detection device has the advantages of less liquid to be tested, resistance to electromagnetic and radio frequency interference, large dynamic range, short response time, and high measurement accuracy. The detection speed still cannot meet the requirements of tracking the pH value change during the rapid chemical reaction of the solution (sub-second level)

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