Handheld device for in-situ determination of nitrate nitrogen in soil and detection method thereof

A nitrate nitrogen, hand-held technology, applied in the direction of measuring device, color/spectral characteristic measurement, material analysis through optical means, etc., can solve the problems of increased detection time, increased equipment cost, expensive diamond cost, etc.

Pending Publication Date: 2020-07-07
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to technical limitations of the existing infrared spectroscopy-based methods, such as the soft zinc selenide crystal material, it is easy to be scratched in the detection of soil samples and affect the detection results, and the diamond is hard and expensive; due to the limitation of crystal materials, the infrared optical path The spectral signal obtained by a single reflection is weak, and the multiple reflections of the optical path can obtain a better signal, but the equipment cost increases, the volume becomes larger, and the detection time is increased; in addition, the sample needs to be collected and moved to the sample cell of the equipment before measurement etc., unable to meet the needs of in-situ determination in the field

Method used

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  • Handheld device for in-situ determination of nitrate nitrogen in soil and detection method thereof
  • Handheld device for in-situ determination of nitrate nitrogen in soil and detection method thereof
  • Handheld device for in-situ determination of nitrate nitrogen in soil and detection method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The invention includes a special device for in-situ and rapid determination of field soil nitrate nitrogen.

[0041] A handheld field soil nitrate nitrogen in-situ measuring device 100 includes a housing 1 and an internal module arranged in the housing. Such as figure 1 As shown, the shell 1 is funnel-shaped, the upper part is tubular, and the outer surface of the upper part is provided with a switch button 2 , a calibration button 3 , a measurement button 4 , a display button 5 and a display screen 6 . A crystal probe 7 is inlaid at the part of the lower part of the casing connected to the funnel mouth, and the soil inserting head 8 of the funnel mouth is a funnel mouth with two thin slices at the bottom, which is used to insert the measuring device into the soil and fix it, and apply a certain pressure to make the crystal probe 7 and The soil is in close contact; the switch button 2 is used to turn on and off the device; the calibration button 3 is used to calibrate ...

Embodiment 2

[0044] This embodiment is basically the same as the previous example, except that a conventional zinc selenide crystal is used as the ATR crystal probe 7 . image 3 For different concentrations of nitrate nitrogen in ATR based on silicon crystal probe and conventional ZnSe crystal ATR at 1350 cm -1 -1320 cm -1 A comparison chart of attenuated total reflectance spectra in the range. Figure 4 It is a scatter diagram for measuring the chemical reference value of standard sample nitrate nitrogen and the measured value of equipment respectively by using a silicon crystal probe and a zinc selenide probe. The correlation coefficient of the value is 0.9999; the correlation coefficient of the chemical reference value of nitrate nitrogen after a single crystal reflection of zinc selenide and the measured value of the equipment is 0.9998.

[0045] The present invention also includes a hand-held field soil nitrate nitrogen in-situ and rapid detection method for the special device, and ...

Embodiment 3

[0047] The present invention is applied on paddy soil, and the field soil is a blank plot in a long-term positioning test (no additional nitrogen fertilizer is applied).

[0048] Step 1: Built-in customized database construction: Prepare a series of standard samples with different concentrations of potassium nitrate solution, the concentration range is 0-20 mg / g, and the interval is 0.2mg / L, for example: 0mg / g, 0.2mg / g, 0.4 mg / g, 0.6mg / g, 0.8mg / g, ..., a total of 100 standard samples were prepared; the spectral information of the standard samples was collected, and the scanning range was 1360 cm -1 -1320 cm -1 , with a scanning resolution of 2 cm -1 , the number of scans is 128 times; each sample is scanned three times, and the average value of the spectrum is taken; it is saved to the device through the control module. The database can be saved in the control module after the first acquisition, and there is no need for repeated collection in subsequent field measurements; ...

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Abstract

The invention relates to a handheld device for in-situ determination of nitrate nitrogen in soil and a detection method thereof. The device comprises a shell and an internal module arranged in the shell, wherein the shell is internally provided with a light source, a reflection light path, a detector and a control module; an open hole is formed in the center of the lower end of the shell, an ATR crystal probe is arranged at the open hole, and a slim-tube-shaped soil inserting head is arranged on the periphery of the open hole; the reflection light path transmits infrared light emitted by the light source to the ATR crystal probe and then transmits emitted light of the ATR crystal probe to the detector; and the detector module converts an optical signal into a digital signal and sends the digital signal to the control template, and the control module processes and analyzes spectral information. The special device is handheld, realizes spectrum-based field in-situ determination for the first time, and is suitable for field and on-site rapid sampling detection.

Description

technical field [0001] The invention belongs to the field of agricultural soil detection methods, and in particular relates to a handheld field soil nitrate nitrogen in-situ measuring instrument based on infrared spectroscopy and silicon crystal probe materials and a method for using the same. Background technique [0002] Soil nitrate nitrogen is not only an important form of soil nitrogen transformation, but also the main form of nitrogen absorbed by crops. Its content is also one of the important indicators to measure soil fertility. Soil nitrate nitrogen content directly affects the growth and yield of crops. In situ and rapid acquisition of soil nitrate nitrogen content can play a guiding role in crop management and regulation. [0003] Existing soil nitrate determination methods mainly use colorimetry, ultraviolet spectrophotometry, ion chromatography, and ion-specific electrode methods. However, the above research methods are all based on laboratory measurements, whi...

Claims

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Application Information

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IPC IPC(8): G01N21/552G01N21/35
CPCG01N21/35G01N21/552
Inventor 杜昌文马菲
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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