Novel method and device for quantitatively measuring ammonia nitrogen in water by ion mobility spectrometry

A technology of ion mobility spectrometry and quantitative measurement, which is applied in the field of high-throughput rapid measurement and high-sensitivity of ammonia nitrogen in water, which can solve the problems of limited service life, electrode pollution, complicated equipment, etc. Few, easy-to-use effects

Inactive Publication Date: 2019-06-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Description
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  • Application Information

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Problems solved by technology

The electrode method has the advantages of not requiring pretreatment of water samples, being less affected by the turbidity of water samples, and lower operating costs, but its electrodes are easily polluted by surfactants in water and have a limited service life.
In recent years, some new methods for measuring ammonia nitrogen have emerged, such as flow injection method, blow-off-conductivity method, enzymatic method, etc., but the equipment required for this method is relatively complicated, the cost is high, and it has not been verified by market practice. still a long way to go

Method used

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  • Novel method and device for quantitatively measuring ammonia nitrogen in water by ion mobility spectrometry
  • Novel method and device for quantitatively measuring ammonia nitrogen in water by ion mobility spectrometry
  • Novel method and device for quantitatively measuring ammonia nitrogen in water by ion mobility spectrometry

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Experimental program
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Effect test

Embodiment 1

[0031] A new method and device for quantitatively measuring ammonia nitrogen in water by ion mobility spectrometry. When working, the migration zone voltage is set to 400V / cm, the drift gas flow is set to 400ml / min, the carrier gas flow is set to 200ml / min, and the tail gas flow is set to 500ml / min, the sampling volume is 200ml / min, and the excess 200ml / min of the carrier gas is discharged by the tee. When measuring a blank sample, the ion mobility spectrum mainly has a reagent reactive ion peak at 4.98ms and a small peak at 4.62ms on the left, such as figure 2 Shown.

Embodiment 2

[0033] The instrument parameters are the same as in implementation case 1. Such as image 3 As shown, when the sample contains ammonia nitrogen, in addition to a peak at 4.98ms in the spectrum of the ion mobility spectrum, a new peak appears at 4.26ms, and the small peak at 4.62ms disappears. The peak intensity at 4.98ms is lower than that without ammonia nitrogen. The content of ammonia nitrogen in the water body can be measured based on the intensity of the peak at 4.26ms. By measuring the concentration of a series of standard samples, a series of peak intensities at 4.26ms are obtained and a calibration curve is made. Measure the unknown sample to obtain the intensity of the peak at 4.26ms, and compare with the calibration curve to obtain the content of ammonia nitrogen in the unknown sample. The detection time of this method is less than 30s, and the detection limit is less than 0.01mg / L, which can meet the requirements of rapid and high-throughput measurement of ammonia ...

Embodiment 3

[0035] The sampling volume can be increased by increasing the flow rate of the second mass flow meter 7. Such as Figure 4 As shown, when other conditions remain unchanged, the flow rate of the second mass flow meter 7, that is, the exhaust gas flow rate is set to 700 ml / min. In the ion mobility spectrum, the unknown spectrum is unchanged, but the signal of ammonia nitrogen is significantly enhanced. Therefore, the method of increasing the exhaust gas flow can be used to increase the sampling volume to obtain a lower detection limit. It is also possible to reduce the flow of exhaust gas as needed to measure samples with higher concentrations.

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Abstract

The invention discloses a novel method and device for quantitatively measuring ammonia nitrogen in water by ion mobility spectrometry. A basic principle of the method is as follows: an ion mobility spectrometer is used for quantitatively measuring ammonia gas generated by a reaction between a sample and alkali, so that the ammonia nitrogen in the water can be measured. The device comprises a constant-temperature heating sleeve, the ion mobility spectrometer, a flowmeter, a reactor, a reaction substrate, a tee joint, a mass flowmeter, a microsyringe, a tetrafluoroethylene tube and the like. Themethod has the advantages of small sampling amount, short detection time (less than 30 seconds), low detection limit (less than 0.01mg / L) and the like, and can meet the requirement of rapid high-fluxmeasurement of the ammonia nitrogen content in various water samples such as surface water, underground water, municipal sewage and the like.

Description

Technical field [0001] The invention relates to a method and a device for quantitatively measuring ammonia nitrogen in water by ion mobility spectrometry, in particular to a new method for high-sensitivity, high-throughput and rapid measurement of ammonia nitrogen in water with a detection limit of 0.1 mg / L. This patent discusses the composition, structure, detection principle, and measurement method of the device. The invention has the characteristics of short detection time (<30s), low detection limit (<0.01mg / L), etc., and can meet the rapid and high-flux measurement of ammonia nitrogen content in various water samples such as surface water, groundwater and municipal sewage. Background technique [0002] With the rapid development of my country's economy and the lag of environmental testing methods and protection measures, a large amount of industrial and domestic wastewater is directly discharged into rivers, lakes, and even the ocean. It contains a large amount of amm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62
Inventor 黄卫李海洋王卫国陈创厉梅
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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