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System and method for automatically and continuously detecting metal in water based on laser breakdown spectroscopy

A laser breakdown spectrum and detection system technology, which is applied in the field of automatic and continuous metal detection systems in water, can solve the problems of multiple types of reagents, high toxicity, difficulty in automation, and low detection accuracy, so as to achieve metal trace detection and avoid secondary contamination. Secondary pollution and high detection accuracy

Active Publication Date: 2017-02-22
LIHE TECH (HUNAN) CO LTD
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Problems solved by technology

[0008] The purpose of the present invention is to provide a system and method for automatic and continuous detection of metals in water based on laser breakdown spectroscopy, so as to solve the problems of poor anti-interference ability, low detection accuracy and many types of reagents in the existing water heavy metal detection technology. High toxicity, complex operation and difficulty in automation

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  • System and method for automatically and continuously detecting metal in water based on laser breakdown spectroscopy

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Embodiment 1

[0047] Such as figure 1As shown, the automatic continuous detection system for metals in water based on laser breakdown spectroscopy provided by the present invention includes a laser 9, a spectrometer 10, a detection pool 1, a second electrode 4, a first electrode 5 and a drying processing unit; the detection pool 1 has a sample feeding End 2 and sample outlet 3, specifically sample inlet port and sample outlet port, for water samples to enter and flow out of the detection cell 1; the second electrode 4 and the first electrode 5 are all in contact with the water sample in the detection cell 1, so that The metal in the water sample in the detection tank 1 is enriched to the first electrode 5; the drying treatment unit is arranged on the side of the detection tank 1, and the first electrode is dried after the water sample in the detection tank is discharged; the first electrode 5 Located on the optical path of the laser 9, the metal enriched on the first electrode 5 generates p...

Embodiment 2

[0063] Another aspect of the present invention also provides an automatic and continuous detection method for metals in water based on laser breakdown spectroscopy, which includes the following steps:

[0064] S1. Continuously input water samples into the detection tank 1, and continuously discharge the water samples when the detection tank 1 is full;

[0065] S2, turn on the power supply 6, and make both the first electrode 5 and the second electrode 4 contact the water sample in the detection cell 1, so that the metal in the water sample in the detection cell 1 is enriched to the first electrode 5;

[0066] S3, striking the laser light of the laser 9 on the first electrode 5, so that the enriched metal generates plasma;

[0067] S4. Receive the spectral signal of the plasma through the spectrometer 10 .

[0068] Which also includes between S2 and S3:

[0069] S20 , after a predetermined metal enrichment time, discharge the water sample in the detection cell 1 , and dry the...

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Abstract

The invention relates to the technical field of environment monitoring, in particular to a system and a method for automatically and continuously detecting metal in water based on laser breakdown spectroscopy. The system comprises a laser, a spectrograph, a detecting pond, a first electrode, a second electrode and a drying treatment unit; the first electrode and the second electrode are both in contact with a water sample in the detecting pond so that the metal in the water sample in the detecting pond is enriched to the first electrode; the drying treatment unit is arranged on the side of the detecting pond to dry the first electrode; a laser beam is projected on the metal which is enriched by the first electrode through the laser so that the metal generates plasmas; a spectral signal of the plasmas is detected through the spectrograph. The technical scheme of the invention has the advantages of good interference resistance, low detection limit, high detection accuracy, easiness in operation, and high automation degree.

Description

technical field [0001] The invention relates to the technical field of environmental monitoring, in particular to an automatic and continuous detection system and method for metals in water based on laser breakdown spectroscopy. Background technique [0002] At present, laser-induced breakdown spectroscopy is mainly used for the detection of heavy metals. This technology has the advantages of no need for complex sample pretreatment, rapidity, and no reagents. However, it is generally used for the detection of heavy metal content in solid samples, and is not suitable for the monitoring of water pollutants. The reason is that the laser plasma signal generated by focusing the laser beam directly on the water is very weak, which is difficult to meet the monitoring of low-concentration pollutants in the water body. [0003] In view of the current situation of heavy metal pollution and monitoring needs in my country, it is of great significance to overcome the difficulties of lase...

Claims

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Application Information

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IPC IPC(8): G01N21/71
CPCG01N21/71
Inventor 文立群程远坤邹雄伟申田田
Owner LIHE TECH (HUNAN) CO LTD
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