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.
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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
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Application Information
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