Water body nitrobenzol content measuring device and measuring method

A measuring device and technology for nitrobenzene, which are applied in the measurement of color/spectral characteristics, preparation of test samples, etc., can solve the problem of large ultraviolet absorption coefficient of nitrobenzene, low linear correlation concentration range of absorbance, and difficult concentration of nitrobenzene solution. and other problems to achieve the effect of eliminating the wall hanging effect

Active Publication Date: 2015-07-29
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The concentration of nitrobenzene solution can be quickly measured by measuring the ultraviolet absorbance of nitrobenzene solution. However, the ultraviolet absorption coefficient of nitrobenzene is relatively large, and the linear correlation concentration range of absorbance is relatively low. Only in the range of 0-30ppm can the measurement be accurate. In addition, Because nitrobenzene is insoluble in water, it is difficult to accurately measure nitrobenzene solutions with a slightly higher concentration, and it is difficult to accurately measure the concentration of nitrobenzene solutions in a wide range by ultraviolet absorption method

Method used

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  • Water body nitrobenzol content measuring device and measuring method
  • Water body nitrobenzol content measuring device and measuring method
  • Water body nitrobenzol content measuring device and measuring method

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Embodiment 1

[0029] The device for measuring the content of nitrobenzene in the water body comprises a shading box 1, a flow cell 2, a light source 3, a detector 4, a water tank 5, a single chip microcomputer 6, a peristaltic pump 7, a three-way solenoid valve 8, a solenoid valve 9, an ultrasonic vibrator 10, a A water pipe 11, a second water pipe 12, a third water pipe 13, a fourth water pipe 14, and a fifth water pipe 15;

[0030] The flow cell 2 is fixed in the light-shielding box 1, the light-shielding box 1 and the flow cell 2 are sealed boxes, the flow cell 2 has at least two sides along the direction of the light path, and the light source 3 is fixed in the flow cell 2 The inner surface of the light-shielding box 1 corresponding to the upper center of the light-transmitting side, the detector 4 is fixed on the inner surface of the light-shielding box 1 directly below the light source 3, and the ultrasonic vibrator 10 is placed in the flow cell 2;

[0031] The peristaltic pump 7 is f...

Embodiment 2

[0034] This water body nitrobenzene content measurement method, adopts the measuring device of embodiment 1 to finish, and the nitrobenzene solution of configuration 20ppm is as the water sample to be tested, and its steps comprise:

[0035] a. Set the nitrobenzene concentration as the ultraviolet absorption spectrum A of 10ppm as the standard spectrum, and select 240nm as the measurement wavelength λ 0 , the measured volume capacity of the flow cell is V=158ml;

[0036] b. Turn on the switch of the single-chip microcomputer, and the single-chip microcomputer starts the light source and the detector in sequence to obtain the original light intensity I when there is no water sample 0 =2893;

[0037] c. The single-chip microcomputer starts the peristaltic pump, controls the three-way solenoid valve, and after the water sample to be tested is pumped into the flow cell, the single-chip microcomputer starts the light source and the detector again to obtain the transmitted light in...

Embodiment 3

[0040] This water body nitrobenzene content measurement method, adopts the measuring device of embodiment 1 to finish, and wherein light source changes deuterium lamp into, the nitrobenzene solution of configuration 35ppm is as the water sample to be measured, and its steps comprise:

[0041] a. Set the nitrobenzene concentration as the ultraviolet absorption spectrum A of 10ppm as the standard spectrum, and select 250nm as the measurement wavelength λ 0 , the measured volume capacity of the flow cell is V=158ml;

[0042] b. Turn on the switch of the single-chip microcomputer, and the single-chip microcomputer starts the light source and the detector in sequence to obtain the original light intensity I when there is no water sample 0 =4489;

[0043] c. The single-chip microcomputer starts the peristaltic pump, controls the three-way solenoid valve, and after the water sample to be tested is pumped into the flow cell, the single-chip microcomputer starts the light source and t...

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Abstract

The invention discloses a water body nitrobenzol content measuring device. A circulation pool is fixedly arranged in a light shielding box; the two sides realize the light transmission; a light source is fixedly arranged on the inner surface of the light shielding box; a detector is fixedly arranged on the inner surface of the light shielding box right under the light source; an ultrasonic vibrator is put in the circulation pool; a peristaltic pump is fixedly arranged in the light shielding box; water in the circulation pool is discharged out of the light shielding box; an electromagnetic valve is fixedly arranged in the light shielding box, and is communicated with the air outside the circulation pool and the light shielding box; a water box is arranged outside the light shielding box; a three-way electromagnetic valve is connected with the water box, the circulation pool and a water sample to be measured; a single chip microcomputer is used for controlling all devices. The invention also discloses a measuring method using the device for measuring the water body nitrobenzol content. The device and the method provided by the invention have the advantages that the large-range and high-concentration water body nitrobenzol content can be accurately measured, the measuring concentration range is expanded to 0 to 300000 ppm, in addition, the cyclic automatic on-line measurement can be realized, and the wall hanging effect of the water-insoluble nitrobenzol can be eliminated by the ultrasonic vibrator.

Description

technical field [0001] The application relates to a water body nitrobenzene content measuring device and a measuring method, belonging to the field of water quality environment monitoring. Background technique [0002] The nitrobenzene in the environment mainly comes from the waste water and exhaust gas of chemical plants and dye factories, especially the sewage discharged from aniline dye factories contains a large amount of nitrobenzene. Nitrobenzene has extremely high stability in water. Since its density is greater than that of water, nitrobenzene entering the water body will sink to the bottom and remain unchanged for a long time. And because it has a certain solubility in water, the water pollution caused by it will last for a long time. In the early warning and treatment of nitrobenzene environmental pollution, accurate measurement of the concentration of nitrobenzene in water helps to understand the degree of water pollution, and can formulate appropriate first aid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/33G01N1/38
Inventor 陈敦军宫能安张开骁胡立群
Owner NANJING UNIV
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