Water quality heavy metal detection method and system

Abstract

The invention relates to a water quality heavy metal detection method and system, and the detection method comprises the steps: S1, collecting a voltage signal, the light intensity of an incident light source, the carrier gas flow and the working temperature of a photomultiplier tube in real time in the collection process of a fluorescence signal of a sample to be detected; s2, correcting the voltage signal by utilizing the light intensity of the reference incident light source, the reference carrier gas flow and the reference working temperature of the photomultiplier before the fluorescence signal of the sample to be detected is acquired, and the light intensity of the incident light source, the carrier gas flow and the working temperature of the photomultiplier which are synchronously acquired with the voltage signal, so as to obtain a voltage spectrogram; s3, converting according to the voltage spectrogram to obtain the heavy metal concentration in the to-be-detected sample. According to the invention, the voltage signal is corrected by using the light intensity of the reference incident light source, the reference carrier gas flow and the reference working temperature of the photomultiplier before the fluorescence signal of the sample to be detected is collected, and the light intensity of the incident light source, the carrier gas flow and the working temperature of the photomultiplier which are synchronously collected with the voltage signal, so that the heavy metal detection precision is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of water quality analysis and detection, and in particular relates to a water quality heavy metal detection method and system. Background technique [0002] There are various methods for detecting heavy metals in water quality, such as spectrophotometry, atomic absorption method, colorimetry, atomic fluorescence spectroscopy, etc. Among them, atomic fluorescence spectroscopy is relatively simple to operate, with high sensitivity and good reliability of measurement results In recent years, it has been widely used in the determination of heavy metal elements in surface water. [0003] Atomic fluorescence spectrometry is a method for quantitative analysis based on the measurement of the fluorescence intensity emitted by the atomic vapor of the element to be measured under the excitation of radiation energy of a certain wavelength. Compounds or simple substances are brought into the quartz atomizer by the carri...

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Problems solved by technology

[0004] In the process of detecting heavy metals in water quality, the light intensity of the incident light source will change, thereby affecting the generated fluorescence signal; in addition, the flow rate of the carrier gas will also affect the fluorescence signal. The larger the flow rate of the carrier gas, the larger the split ratio, and the unit volume and time The peak value of the fluorescent signal formed in the interior is higher, but the peak area is smaller; the smaller the flow rate of the carrier gas, the higher the peak value of the fluorescent signal formed per unit volume and time, the smaller the split ratio, and the smaller the peak area; moreover, the photomultiplier tube The decrease of working temperature will also cause the increase of fluorescence intensity

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