Quick detecting device and method of toxic and harmful organic chemical pollutants in water body

Abstract

The invention discloses a quick detecting device and method of toxic and harmful organic chemical pollutants in a water body. The quick detecting device and method are used for meeting the demands of safety precaution of drinking water of our country and quick online detection of the toxic and harmful organic chemical pollutants in the water body and overcoming the defects of the existing detecting measures. A narrow-band LED (Light Emitting Diode) servers as an excitation light source, an echelle grating serves as a fluorescence optical splitter, and a gating ICCD (Intensified Charge Coupled Device) serves as a fluorescence detector for researching the quick detecting method and system of the toxic and harmful organic chemical pollutants in the environmental water body of our country and developing a quick online detecting model machine with high sensitivity on the toxic and harmful organic chemical pollutants in the water body, the toxic and harmful organic chemical pollutants in the water body are quickly and effectively measured in a laboratory, the manual sampling is avoided, the structure of an instrument is simple, and the utilization rate of the excitation light source is high and the detecting speed is high, so that the quick detecting device and method are suitable for online detecting and early-warning on the trace toxic and harmful organic chemical pollutants in the natural water body and online emission reduction monitoring on industrial waste water so as to reflect the pollution condition of the water body in real time.

Description

technical field [0001] The invention relates to the field of chemical pollutant detection systems, in particular to a rapid detection device and detection method for toxic organic chemical pollutants in water bodies. Background technique [0002] The pollution caused by excessive discharge of industrial wastewater, serious lack of domestic sewage treatment facilities, and untreated farmland drainage directly affects the safety of drinking water quality and seriously endangers human health. Among them, chemical pollutants are the most typical, and most of them are carcinogenic, teratogenic, and mutagenic. It is estimated that the tumors related to chemical pollutants account for more than 90%. [0003] Europe, the United States, Japan and other countries have conducted a lot of research on water toxic organic chemical pollutants (including oil, phenols, polycyclic aromatic hydrocarbons, pesticides, etc.), and formulated a series of control standards and regulations. The rese...

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Problems solved by technology

However, the current methods for obtaining three-dimensional fluorescence spectra are mainly based on ultraviolet-visible fluorescence spectrophotometers, which have low utilization efficiency of excitation light sources, complex structures, and slow detection speeds. The details are as follows:

[0005] ①.Excitation light source: deuterium lamp, tungsten lamp or pulse xenon lamp are usually used. The light source has short service life, unstable intensity, high energy consumption, and high voltage danger;

[0006] ②. Using monochromator mechanical scanning to realize the selection of excitation light wavelength, the wavelength scanning speed is slow, the light intensity of the light source is extremely weak after passing through the complex monochromator, so the utilization efficiency of the light source intensity is extremely low, and the structure of the excitation light path is very complicated;

[0007] ③. Fluorescence detection usually uses a photomultiplier tube as a detector. Although it has high sensitivity, it requires a spectral spectrometer. For example, a monochromator is used to mechanically scan to achieve fluorescence wavelength selection and detection, and the fluorescence detection takes a long time.

[0008] In addition, gratings are also used to split the light, and CCD is used as a detector to realize simultaneous multi-wavelength measurement of fluorescence, which greatly shortens the detection time of fluorescence. The problem is: if you need to obtain fluorescence spectra with high resolution and wide spectral range, a single grating The function of choosing one of the two, as a detector, the sensitivity of CCD is much lower than that of photomultiplier tube, and it is not easy to control the detection time, so that a large amount of background spectral information is detected during measurement, which further reduces the sensitivity of fluorescence detection

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