CN106248468A - A kind of detection method of humic acids from different soils content - Google Patents
A kind of detection method of humic acids from different soils content Download PDFInfo
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- CN106248468A CN106248468A CN201610883168.0A CN201610883168A CN106248468A CN 106248468 A CN106248468 A CN 106248468A CN 201610883168 A CN201610883168 A CN 201610883168A CN 106248468 A CN106248468 A CN 106248468A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/34—Purifying; Cleaning
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/55—Specular reflectivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/55—Specular reflectivity
- G01N2021/558—Measuring reflectivity and transmission
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Abstract
The invention discloses the detection method of a kind of humic acids from different soils content, comprise the following steps: gather the required pedotheque measuring humic acid content；By the pedotheque removal of impurity, air-dried, grinding, under the conditions of 45 55 DEG C, finally it is dried 2h, obtains soil to be measured；Measure the soil to be measured reflectance at 350 2500nm wave bands, obtain the reflectivity data of 350 2500nm wave bands；After the reflectivity data of 350 2500nm wave bands is carried out multiplicative scatter correction, use wavelet de-noising, then be smoothed；Extract the soil to be measured reflectivity data at specific wavelength；The reflectivity data extracted is substituted into humic acids from different soils content detection model, calculates the humic acid content of this pedotheque.The detection method of humic acids from different soils content of the present invention, achieve the quick and precisely detection of humic acid content in soil, need not prepare any chemical reagent, avoid the chemistry tail liquid emissions pollution to environment and the injury to human body during mensuration, also greatly simplify operating procedure simultaneously, shorten the detection time.
Description
Technical field
The invention belongs to soil nutrient detection technique field, be specifically related to the detection method of a kind of humic acids from different soils content.
Background technology
Humic acid is the key component of humus, dissolves in alkali, but foretells at acid condition and form precipitation, mainly in brown
Color or dark brown.Containing the functional group such as hydroxyl, carboxyl in humic acid, can be with metal ion, oxide, mineral and poisonous and harmful
Organic pollution interacts, the serious environmental behaviour affecting these materials.Humic acid is a kind of macromolecular organic
Compound, has the character of colloid in the solution.Humic acid molecule contains hydrophobic functional group and hydrophilic functional groups simultaneously so that it is point
Son band heterogeneity and electric charge of quantity in the solution that chemical property is different, thus affect humic acid moving in surrounding medium
Move.Humic acid in the soil liquid is possible not only to cause serious water environment pollution, also the pollutant such as heavy metal and pesticide tool
There is the strongest absorbability.The dissolved humic acid can promote pollutant migration in soil, and absorption is on soil particle
Humic acid then can stop the migration of pollutant.Meanwhile, containing various nutrient elements in humic acid, by mineralization releasable for planting
Thing absorbs.Therefore, obtain the humic acid content data in soil, be soil fertility diagnosis, soil rational application of fertilizer necessity
Digit basis, is also to understand the soil important reference to pollutant purification ability.
The detection method of existing humic acids from different soils content needs to prepare chemical reagent, chemistry tail liquid emissions during mensuration
Pollution to environment and the injury to human body, and there is complex operation step, the defect of detection time length.Therefore, it is necessary to
Develop the detection method of pollution-free, easy and simple to handle, the most accurate a kind of humic acids from different soils content.
Summary of the invention
It is an object of the invention to provide the detection method of a kind of humic acids from different soils content, solve existing detection method and measure
During the chemistry tail liquid emissions pollution to environment and the injury to human body, and there is complex operation step, the detection time is long
Problem.
The detection method of a kind of humic acids from different soils content that the present invention provides, comprises the following steps:
Step 1, gathers the required pedotheque measuring humic acid content；
Step 2, by the pedotheque removal of impurity, air-dried, grinding, is finally dried 2h under the conditions of 45-55 DEG C, obtains soil to be measured
Earth；
Step 3, measures the soil to be measured reflectance at 350-2500nm wave band, obtains the reflectance of 350-2500nm wave band
Data；
Step 4, after the reflectivity data of 350-2500nm wave band is carried out multiplicative scatter correction, uses wavelet de-noising, then
It is smoothed；
Step 5, extract soil to be measured 751nm, 1455nm, 1456nm, 1457nm, 1458nm, 2084nm, 2085nm,
2118nm、2119nm、2124nm、2125nm、2126nm、2127nm、2152nm、2153nm、2154nm、2158nm、2159nm、
The reflectivity data of 2160nm wavelength；
Step 6, the reflectivity data substitution humic acids from different soils content detection model that will extract:
Y=-48.45585x1+43.5533x2+43.51083x3+43.4203x4+43.32128x5-6.36302x6-
4.506844x7-7.844196x8-7.857329x9-7.935672x10-7.418114x11-7.519765x12-6.983428x13-
9.869095x14-10.24447x15-10.74302x16-11.32498x17-11.51799x18-10.42357x19+ 0.27358,
Calculate the humic acid content of this pedotheque；
Wherein, Y is humic acid content, and unit is g/kg；x1、x2、x3、x4、x5、x6、x7、x8、x9、x10、x11、x12、x13、
x14、x15、x16、x17、x18、x19Be respectively soil to be measured 751nm, 1455nm, 1456nm, 1457nm, 1458nm, 2084nm,
2085nm、2118nm、2119nm、2124nm、2125nm、2126nm、2127nm、2152nm、2153nm、2154nm、2158nm、
The reflectance of 2159nm, 2160nm wavelength.
Preferably, in step 2, by pedotheque in room-dry, and after grinding, via diameter is the sieve of 2mm.
Preferably, in step 3, the determining instrument of described spectral reflectivity is the QualitySpec that ASD company of the U.S. produces
Trek Handheld spectrometer, its spectral resolution 350-700nm be 3nm, 701-1400nm be that 9.8nm, 1401-2500nm are
8.1nm。
Preferably, in step 3, soil to be measured is laid in the pitch-dark culture dish of a diameter of 5cm, during mensuration, keeps
Indoor environment temperature is constant, control well QualitySpec Trek Handheld spectrometer probe with soil surface to be measured away from
From, make probe internally provided light source not light leak.
Preferably, after soil to be measured is laid in the culture dish of a diameter of 5cm, the thickness of soil to be measured is 10-15mm.
Preferably, in step 4, the method that described smoothing processing uses is Savitzky-Golay Smoothing, smooth
Window is 7.
Preferably, in step 5,751nm, 1455nm, 1456nm, 1457nm, 1458nm, 2084nm, 2085nm,
2118nm、2119nm、2124nm、2125nm、2126nm、2127nm、2152nm、2153nm、2154nm、2158nm、2159nm、
The reflectivity data of 2160nm wavelength, the most same soil to be measured is repeated 4 times the meansigma methods of the reflectivity data of mensuration.
The detection method of humic acids from different soils content of the present invention, it is achieved that the quick and precisely detection of humic acid content in soil,
Need not prepare any chemical reagent, it is to avoid the chemistry tail liquid emissions pollution to environment and the wound to human body during measuring
Evil, also greatly simplify operating procedure simultaneously, shortens the detection time.Humic acids from different soils data determination in agricultural production can be met
Demand, it is provided that the means of quick obtaining dose foundation, be suitable for popularization and application.
Accompanying drawing explanation
Fig. 1 humic acids from different soils measured value and detected value scatterplot.
Detailed description of the invention
Below in conjunction with the accompanying drawings and specific embodiment, the detailed description of the invention of invention is described in detail, it is to be understood that
Protection scope of the present invention is not limited by detailed description of the invention.
Embodiment 1
Step 1, gathers the required pedotheque measuring humic acid content, and pedotheque depth selection is 20-40cm, due to
In sample area, the humic acid content of diverse location soil is different, in order to draw the Hu in this regional soil more accurately
Quick acid content, in order to verify feasibility and the repeatability of the method, we acquire 100 pedotheques altogether and are measured.
Step 2, by the pedotheque removal of impurity, disposed within air-dried, with mortar grinder, then via diameter is the sieve of 2mm,
Last dry 2h under the conditions of 50 DEG C, obtains soil to be measured.
Described impurity is stone, macroscopic root system of plant and dry branches and fallen leaves.
It should be noted that the arbitrary temperature between 45-55 DEG C is used equally to dry soil sample, and can reach same
Effect, therefore the present embodiment is only as a example by 50 DEG C, and the step of the present invention is described.
Step 3, is laid in soil to be measured in the pitch-dark culture dish of a diameter of 5cm, and soil to be measured is laid in diameter
After the culture dish of 5cm, the thickness of soil to be measured is 15mm, during mensuration, keeps indoor environment temperature constant, controls well
The probe of QualitySpec Trek Handheld spectrometer and the distance of soil surface to be measured, make probe internally provided light source not light leak,
Then the QualitySpec Trek Handheld spectrometer produced with ASD company of the U.S. measures soil to be measured at 350-2500nm ripple
The reflectance of section, obtains the reflectivity data of 350-2500nm wave band.
As long as may be used for measuring reflectance it should be noted that soil is paved with flat board, it is preferred that soil to be measured
Thickness is 10-15mm, and above-mentioned condition all can reach same effect, therefore the present embodiment is only as a example by 15mm, illustrates the present invention's
Step.
It should be noted that in the QualitySpec Trek Handheld spectrometer of ASD company production, spectral resolution exists
350-700nm be 3nm, 701-1400nm be 9.8nm, 1401-2500nm be 8.1nm.
Step 4, after the reflectivity data of 350-2500nm wave band is carried out multiplicative scatter correction, uses wavelet de-noising, then
Being smoothed, the method that smoothing processing uses is Savitzky-Golay Smoothing, and smooth window is 7；
Step 5, extract soil to be measured 751nm, 1455nm, 1456nm, 1457nm, 1458nm, 2084nm, 2085nm,
2118nm、2119nm、2124nm、2125nm、2126nm、2127nm、2152nm、2153nm、2154nm、2158nm、2159nm、
The reflectivity data of 2160nm wavelength；
Step 6, the reflectivity data substitution humic acids from different soils content detection model that will extract:
Y=-48.45585x1+43.5533x2+43.51083x3+43.4203x4+43.32128x5-6.36302x6-
4.506844x7-7.844196x8-7.857329x9-7.935672x10-7.418114x11-7.519765x12-6.983428x13-
9.869095x14-10.24447x15-10.74302x16-11.32498x17-11.51799x18-10.42357x19+ 0.27358,
Calculate the humic acid content of this pedotheque；
Wherein, Y is humic acid content, and unit is g/kg；x1、x2、x3、x4、x5、x6、x7、x8、x9、x10、x11、x12、x13、
x14、x15、x16、x17、x18、x19Be respectively soil to be measured 751nm, 1455nm, 1456nm, 1457nm, 1458nm, 2084nm,
2085nm、2118nm、2119nm、2124nm、2125nm、2126nm、2127nm、2152nm、2153nm、2154nm、2158nm、
The reflectance of 2159nm, 2160nm wavelength.
It should be noted that for the humic acid content detecting each pedotheque more accurately, we are to same soil
Earth sample is repeated 4 times mensuration, obtains the reflectivity data of 4 groups of 350-2500nm wave bands, and to often organizing 350-2500nm wave band
After reflectivity data carries out multiplicative scatter correction, use wavelet de-noising, then be smoothed；Extract the same of 4 mensuration respectively
One pedotheque 751nm, 1455nm, 1456nm, 1457nm, 1458nm, 2084nm, 2085nm, 2118nm, 2119nm,
2124nm, 2125nm, 2126nm, 2127nm, 2152nm, 2153nm, 2154nm, 2158nm, 2159nm, 2160nm wavelength anti-
Penetrate rate data, take the meansigma methods of corresponding wavelength respectively, bring humic acids from different soils content detection model into, i.e. obtain a pedotheque
Humic acid content.
Table 1 is that the actual value of 100 the pedotheque humic acid content utilizing indoor chemical assay to obtain is real with utilization
Executing the statistical data of the detected value that the method for example 1 obtains, as known from Table 1,100 pedotheque actual values are average with detected value
Value, maximum, minima are the most close；Fig. 1 is the fitting degree of pedotheque humic acid content detection value and actual value.Very
The coefficient of determination (R between real-valued and detected value2) reaching 0.74, root-mean-square error (RMSE) only has 0.47g/kg, average absolute
Error (MAE) only has 0.38g/kg, and standard deviation reaches 1.85 with root-mean-square error ratio (RPD), according to RPD evaluation criterion, RPD >
1.4, illustrate that model has preferable predictive ability.This result shows, the method for the present invention can detect soil accurately and rapidly
Sample humic acid content.
Table 1 humic acids from different soils content detection result
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and amendment to these embodiments.So, claims are intended to be construed to include excellent
Select embodiment and fall into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and the modification essence without deviating from the present invention to the present invention
God and scope.So, if these amendments of the present invention and modification belong to the scope of the claims in the present invention and equivalent technologies thereof
Within, then the present invention is also intended to comprise these change and modification.
Claims (7)
1. the detection method of a humic acids from different soils content, it is characterised in that comprise the following steps:
Step 1, gathers the required pedotheque measuring humic acid content；
Step 2, by the pedotheque removal of impurity, air-dried, grinding, is finally dried 2h under the conditions of 45-55 DEG C, obtains soil to be measured；
Step 3, measures the soil to be measured reflectance at 350-2500nm wave band, obtains the reflectance number of 350-2500nm wave band
According to；
Step 4, after the reflectivity data of 350-2500nm wave band is carried out multiplicative scatter correction, uses wavelet de-noising, then carries out
Smoothing processing；
Step 5, extract soil to be measured 751nm, 1455nm, 1456nm, 1457nm, 1458nm, 2084nm, 2085nm,
2118nm、2119nm、2124nm、2125nm、2126nm、2127nm、2152nm、2153nm、2154nm、2158nm、2159nm、
The reflectivity data of 2160nm wavelength；
Step 6, the reflectivity data substitution humic acids from different soils content detection model that will extract:
Y=-48.45585x1+43.5533x2+43.51083x3+43.4203x4+43.32128x5-6.36302x6-
4.506844x7-7.844196x8-7.857329x9-7.935672x10-7.418114x11-7.519765x12-6.983428x13-
9.869095x14-10.24447x15-10.74302x16-11.32498x17-11.51799x18-10.42357x19+ 0.27358,
Calculate the humic acid content of this pedotheque；
Wherein, Y is humic acid content, and unit is g/kg；x1、x2、x3、x4、x5、x6、x7、x8、x9、x10、x11、x12、x13、x14、
x15、x16、x17、x18、x19Be respectively soil to be measured 751nm, 1455nm, 1456nm, 1457nm, 1458nm, 2084nm,
2085nm、2118nm、2119nm、2124nm、2125nm、2126nm、2127nm、2152nm、2153nm、2154nm、2158nm、
The reflectance of 2159nm, 2160nm wavelength.
The detection method of humic acids from different soils content the most according to claim 1, it is characterised in that in step 2, by soil-like
Product are in room-dry, and after grinding, via diameter is the sieve of 2mm.
The detection method of humic acids from different soils content the most according to claim 1, it is characterised in that in step 3, described spectrum
The determining instrument of reflectance is the QualitySpec Trek Handheld spectrometer that ASD company of the U.S. produces, its spectral resolution
350-700nm be 3nm, 701-1400nm be 9.8nm, 1401-2500nm be 8.1nm.
The detection method of humic acids from different soils content the most according to claim 3, it is characterised in that in step 3, by soil to be measured
Earth is laid in the pitch-dark culture dish of a diameter of 5cm, during mensuration, keeps indoor environment temperature constant, controls well
The probe of QualitySpec Trek Handheld spectrometer and the distance of soil surface to be measured, make probe internally provided light source not light leak.
The detection method of humic acids from different soils content the most according to claim 4, it is characterised in that soil to be measured is laid in
After the culture dish of a diameter of 5cm, the thickness of soil to be measured is 10-15mm.
The detection method of humic acids from different soils content the most according to claim 1, it is characterised in that in step 4, described smooth
Processing the method used is Savitzky-Golay Smoothing, and smooth window is 7.
The detection method of humic acids from different soils content the most according to claim 1, it is characterised in that in step 5,751nm,
1455nm、1456nm、1457nm、1458nm、2084nm、2085nm、2118nm、2119nm、2124nm、2125nm、2126nm、
The reflectivity data of 2127nm, 2152nm, 2153nm, 2154nm, 2158nm, 2159nm, 2160nm wavelength, the most same treats
Survey the meansigma methods that soil is repeated 4 times the reflectivity data of mensuration.
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| CN113758897A (en) * | 2021-09-23 | 2021-12-07 | 云南省烟草公司昆明市公司 | Near infrared spectrum-based soil hydrolyzable nitrogen calculation method, prediction method and prediction system |
| CN113945538A (en) * | 2021-10-12 | 2022-01-18 | 云南省烟草公司昆明市公司 | Soil organic matter content calculation method, prediction method and prediction system based on near infrared spectrum |
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