CN109975252A - A kind of oil-contaminated soil rapid detection method based on laser induced breakdown spectroscopy - Google Patents
A kind of oil-contaminated soil rapid detection method based on laser induced breakdown spectroscopy Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 68
- 238000001514 detection method Methods 0.000 title claims abstract description 65
- 238000002536 laser-induced breakdown spectroscopy Methods 0.000 title claims abstract description 50
- 238000004458 analytical method Methods 0.000 claims abstract description 10
- 239000003921 oil Substances 0.000 claims description 43
- 230000003595 spectral effect Effects 0.000 claims description 34
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 15
- 229910052799 carbon Inorganic materials 0.000 claims description 15
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- 239000001301 oxygen Substances 0.000 claims description 15
- 229910052760 oxygen Inorganic materials 0.000 claims description 15
- 239000000126 substance Substances 0.000 claims description 13
- 230000015556 catabolic process Effects 0.000 claims description 6
- 238000012417 linear regression Methods 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 238000004611 spectroscopical analysis Methods 0.000 claims description 5
- 150000002500 ions Chemical class 0.000 claims description 4
- 239000010779 crude oil Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 238000011897 real-time detection Methods 0.000 abstract description 4
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 7
- 239000003208 petroleum Substances 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
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- 238000012935 Averaging Methods 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical group [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- YZCKVEUIGOORGS-UHFFFAOYSA-N Hydrogen atom Chemical compound [H] YZCKVEUIGOORGS-UHFFFAOYSA-N 0.000 description 1
- 238000004566 IR spectroscopy Methods 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
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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
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
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Abstract
The invention belongs to soil oil-containing detection technique field more particularly to a kind of oil-contaminated soil rapid detection methods based on laser induced breakdown spectroscopy.This kind of rapid detection method have the characteristics that high sensitivity, non-contact continuous detection, it can be achieved that original position, real-time detection technical requirements.A kind of oil-contaminated soil rapid detection method based on laser induced breakdown spectroscopy, it include to form sample to be tested, background sample, laser induced incandescence, collect laser induced breakdown spectroscopy signal, comparison data library, sample to be tested, background sample are parsed, analysis obtains the quantitative and qualitative result of contained oil product in sample to be tested.
Description
Technical field
The invention belongs to soil oil-containing detection technique fields more particularly to a kind of based on laser induced breakdown spectroscopy
Oil-contaminated soil rapid detection method.
Background technique
After petroleum and oil product can seriously pollute soil, water body and air for the survival of mankind, and generation is serious
Fruit.During oil exploitation, the petroleum meeting contaminated soil leaked, and can penetrate into underground rapidly, it kills in soil
Microorganism, change soil constituent, influence earth's surface ecology, time that may be even upper century-old in decades by contaminated area
It inside all can not even a blade of grass grows.Many studies have shown that after petroleum hydrocarbon chemical substance enters in animal body, to mammal and the mankind
There are carcinogenic, teratogenesis, mutagenic effect.Certain ingredients that serious soil pollution will lead to petroleum hydrocarbon accumulate in grain, shadow
The quality of grain is rung, and by food chain, endangers human health.
The existing detection method for oil-contaminated soil has very much, such as: gravimetric method, infrared spectrophotometry, uv-spectrophotometric
Method, fluorescence spectrophotometry, gas chromatography etc..But inventor has found in the course of the research, and existing detection method is still deposited
There are many defects: on the one hand, since test is had differences with standard oil component, even if using same test process, same
A collection of sample, there is also have bigger difference for test acquired results；On the other hand, existing detection method needs molten using extracting
Agent carries out extraction process processing to petroleum hydrocarbon in institute's sample, and the extracting power of different extractants is different, and then can be to detection
As a result Different Effects are generated.In addition, leakage point in situ detection can not be rapidly completed in above-mentioned detection method.
Summary of the invention
The present invention provides a kind of oil-contaminated soil rapid detection method based on laser induced breakdown spectroscopy, this kind fast
Fast detection method have the characteristics that high sensitivity, non-contact continuous detection, it can be achieved that original position, real-time detection technical requirements.
In order to solve the above technical problems, present invention employs following technical solutions:
A kind of oil-contaminated soil rapid detection method based on laser induced breakdown spectroscopy, the detection method includes as follows
Step:
Step 1: weighing oil-contaminated soil sample, form sample to be tested；It the not oil-containing pedotheque of quality such as weighs, forms background sample
This；
Step 2: focusing on sample to be tested, background sample respectively using laser beam；It is respectively formed sample to be tested, background sample
Gas ions simultaneously shine；
Step 3: collecting the laser induced breakdown spectroscopy signal and background sample of sample to be tested respectively using signal collection system
Laser induced breakdown spectroscopy signal；
Step 4: respectively by the laser induced breakdown spectroscopy signal of step 3 gained sample to be tested, step 3 gained background sample swash
The laser induced breakdown spectroscopy data included in photoinduction breakdown spectral signal and database are compared；According to position of spectral line and
The intensity of spectral line, parsing obtain the metallic element type and content information for including in sample to be tested, carbon, nitrogen, oxygen and its compound
Component content correlation information, and parsing obtain the metallic element type and content information for including in background sample, carbon, nitrogen,
Oxygen and its chemical composition content correlation information；
Step 5: the laser induced breakdown spectroscopy signal of comparison step 3 gained sample to be tested and swashing for step 3 gained background sample
Photoinduction breakdown spectral signal, in conjunction with the metallic element type and content information for including in step 4 gained sample to be tested, carbon,
The metallic element type for including in nitrogen, oxygen and its chemical composition content correlation information and step 4 gained background sample
With content information, carbon, nitrogen, oxygen and its chemical composition content correlation information, analysis obtains contained oil product in sample to be tested
Quantitative and qualitative result.
It is further preferred that further including having before the detection method step 1:
Step 0: weighing several pieces and quantify soil sample, be added without standard oil in first part of soil sample；From second part of soil
Sample starts that standard oil is added according to incremental adding proportion；After every part of sample mixes well, a pedotheque detection is formed
Sequence；
Parsing obtains the laser induced breakdown spectroscopy signal of each sample in pedotheque detection sequence, and induced with laser is added and hits
It wears in spectroscopic data database.
It is further preferred that the detection method further includes having:
Step 6: after step 5 analysis obtains the quantitative and qualitative result of contained oil product in sample to be tested, oil-contaminated soil region being done
Transversal scanning detection and multiple spot longitudinally deepen detection, and oil content and oil-containing soil in certain mass soil are obtained after weighted average
The area of earth.
More preferred, the step 2 further includes having: adjustment laser beam and sample to be tested, laser beam and background sample it
Between focusing distance so that laser beam irradiation is irradiated in the energy density on sample to be tested surface, laser beam on background sample surface
Energy density reach maximum.
Preferably, weighed soil sample is based on 14 basic classifications in China's soil.
Preferably, based on the standard oil of addition obtains crude oil sample by different oil reservoir blocks exploitation place, and according to class
It pushes away to obtain metering room mixing sample, multi-purpose station mixing sample, petrol station mixing sample, oil field sample.
Preferably, it according to the laser induced breakdown spectroscopy signal of each sample in obtained pedotheque detection sequence, builds
The vertical equation of linear regression characterized by characteristic spectral line intensity, pedotheque detection sequence Plays oil product adding proportion.
It is selectable, select spy of the characteristic spectral line intensity as equation of linear regression corresponding to C-N388.2nm characteristic peak
Sign.
The present invention provides a kind of the oil-contaminated soil rapid detection method based on laser induced breakdown spectroscopy, this method
It include to form sample to be tested, background sample, laser induced incandescence, collection laser induced breakdown spectroscopy signal, comparison data library,
Sample to be tested, background sample are parsed, analysis obtains the quantitative and qualitative result of contained oil product in sample to be tested.With above-mentioned
The oil-contaminated soil rapid detection method of step has the advantage that with traditional oil-contaminated soil detection means
1. simply even without pretreatment, on-line checking in situ may be implemented in tested oil-contaminated soil sample pretreatment, it is suitable for existing
Field monitoring task；
2. data analyzing speed is fast, high sensitivity, real-time detection task can be completed；
3. laser induced breakdown spectroscopy can carry out full elemental analysis；
4. highly integrated commercial apparatus can be made according to this method, the on-site test task being suitable under complex environment.
Specific embodiment
The present invention provides a kind of oil-contaminated soil rapid detection method based on laser induced breakdown spectroscopy, this kind fast
Fast detection method have the characteristics that high sensitivity, non-contact continuous detection, it can be achieved that original position, real-time detection technical requirements.
Embodiment one
Oil-contaminated soil rapid detection method of this kind based on laser induced breakdown spectroscopy, specifically includes and has the following steps:
Step 1: weighing oil-contaminated soil sample, form sample to be tested；It the not oil-containing pedotheque of quality such as weighs, forms background sample
This；
Step 2: focusing on sample to be tested, background sample respectively using laser beam；It is respectively formed sample to be tested, background sample
Gas ions simultaneously shine；
On the basis of completing step 1, further use laser beam focus in sample to be tested, background sample surface location at,
So that sample to be tested, background sample form plasma and shine.Such as: it is exported with wavelength for the laser output system of 532nm
Laser beam for, single pulse energy metric density is about 40mJ/cm2, acquisition delay is 3 μ s, and acquisition gate-width is 6 μ s.As this
A kind of more preferred embodiment is invented, effect is irradiated to improve laser beam, is utilizing laser beam focus sample to be tested, background
During sample, the focusing distance between laser beam and sample to be tested, laser beam and background sample can adjust, so that laser beam
It irradiates and reaches maximum in the energy density that the energy density on sample to be tested surface, laser beam irradiate on background sample surface, from
And realize most preferred bombardment with laser beams effect.
Step 3: collecting the laser induced breakdown spectroscopy signal and background of sample to be tested respectively using signal collection system
The laser induced breakdown spectroscopy signal of sample；
On the basis of completing step 2, the laser-induced breakdown of sample to be tested is further collected respectively using signal collection system
The laser induced breakdown spectroscopy signal of spectral signal and background sample.Likewise, can be by adjusting during signal collection
Signal collection system and the distance between sample to be tested, background sample, so that entire signal collection device is in optimal collection
Posture.On the one hand it plays and increases signal collection angular aperture, increase spectral signal intensity, improve the effect of signal-to-noise ratio；On the other hand,
By inhibiting the interference of outer bound pair spectral signal, but also entire signal transmission system becomes more flexibility, to adapt to not
With detection environment severe under working environment.
Step 4: respectively by the laser induced breakdown spectroscopy signal of step 3 gained sample to be tested, step 3 gained background sample
Laser induced breakdown spectroscopy signal and database in the laser induced breakdown spectroscopy data included be compared；According to spectral line position
It sets and the intensity of spectral line, parsing obtains the metallic element type and content information for including in sample to be tested, carbon, nitrogen, oxygen and its change
Polymer component content correlation information, and parse and obtain the metallic element type and content information for including in background sample, carbon,
Nitrogen, oxygen and its chemical composition content correlation information；
Wherein, above-mentioned comparison process can be completed by computer system substep, to respectively obtain sample to be tested, wrap in background sample
The metallic element type and content information included, carbon, nitrogen, oxygen and its chemical composition content correlation information etc., does not do herein
It repeats.
Step 5: the laser induced breakdown spectroscopy signal and step 3 gained background sample of comparison step 3 gained sample to be tested
Laser induced breakdown spectroscopy signal, in conjunction with the metallic element type and content information for including in step 4 gained sample to be tested,
The metallic element for including in carbon, nitrogen, oxygen and its chemical composition content correlation information and step 4 gained background sample
Type and content information, carbon, nitrogen, oxygen and its chemical composition content correlation information, analysis obtain contained oil in sample to be tested
The quantitative and qualitative result of product.
It is completed likewise, the step 5 can be compared by computer system substep.It is worth noting that, sample to be tested, background sample
There is only the differences in oil content for this two, by the metallic element kind for including in sample to be tested, background sample the two
Class and content information, the comparison of carbon, nitrogen, oxygen and its chemical composition content correlation information, can understand it is determining obtain to
The quantitative and qualitative result of contained oil product in test sample sheet.
It further, further include having step 6 in this detection method.Specifically, step 6: doing transverse direction to oil-contaminated soil region
Scanning Detction and multiple spot longitudinally deepen detection, and oil content in certain mass soil and oil-contaminated soil are obtained after weighted average
Area.
It should be noted that the oil-contaminated soil provided by the invention based on laser induced breakdown spectroscopy is described above
During rapid detection method, the hardware devices such as laser beam, signal collection system have been referred to, in fact those skilled in the art
Corresponding spectral detection system can be designed according to actual needs, such as: spectral detection system specifically may include have CCD spectrometer,
Matched spectrum analysis software and computer etc..Its course of work can be described as: enable master control by computer sending
Device controls the distance that laser ranging module measurement laser reaches sample to be tested, background sample, and by the range information through master control
Device processed feeds back to computer.Computer reaches the distance of sample to be tested, background sample according to feedback adjustment laser.Then, swash
Light device, which generates, focuses the outer surface that laser beam just focuses on sample to be tested, background sample, generates laser induced plasma.Light
Collector acquires the spectral information of laser induced plasma by certain angle.Using optical fiber connection CCD spectrometer, while by
Computer issues the spectral information of instruction control CCD spectrometer recording laser induced plasma, and is transferred to through master controller
Spectroscopic data is finally compared by computer with the emission spectra data of atom in database or ion, and returned by computer
Belong to element representated by all spectral lines out, the content information of various elements is further calculated according to the intensity of spectral line information.It takes out
Metallic element, carbon, nitrogen, oxygen and its chemical composition information further with the type of different zones oil-contaminated soil in database,
Data line in terms of content and correlation can do the qualitative and quantitative analysis of oil-contaminated soil after comparing.
Embodiment two
In addition, as more preferred embodiment of the invention a kind of, which further includes having foundation/rich before step 1
The step of rich laser induced breakdown spectroscopy data database.
Specifically, step 0: weighing several pieces and quantify soil sample, be added without standard oil in first part of soil sample；From
Second part of soil sample starts that standard oil is added according to incremental adding proportion；After every part of sample mixes well, a soil is formed
Earth sample detection sequence；
Parsing obtains the laser induced breakdown spectroscopy signal of each sample in pedotheque detection sequence, and induced with laser is added and hits
It wears in spectroscopic data database.
Wherein preferred, weighed soil sample is based on 14 basic classifications in China's soil；The standard oil of addition
Based on product obtain crude oil sample by different oil reservoir blocks exploitation place, and according to analogizing to obtain metering room mixing sample, multi-purpose station
Mix sample, petrol station mixes sample, oil field sample；According to the induced with laser of each sample in obtained pedotheque detection sequence
Breakdown spectral signal establishes the line characterized by characteristic spectral line intensity, pedotheque detection sequence Plays oil product adding proportion
Property regression equation.
For example, the oil sample for choosing four parts of standard soil samples and three different blocks is tested, and sample 1 is
Standard soil sample, sample 2 are that the petroleum of standard soil sample addition 1# block is mixed into the sample of 100mg/Kg, and sample 3 is
The petroleum that 2# block is added in standard soil sample is mixed into the sample of 200mg/Kg, and sample 4 is that the area 3# is added in standard soil sample
The petroleum of block is mixed into the sample of 600mg/Kg.We export 532nm, 40mJ/cm using laser output device2Laser beam,
Irradiation sample 1,2,3,4 respectively, analysis obtain its respective laser induced breakdown spectroscopy data (when specific operation, each sample
20 width spectrum are acquired respectively, 10 width are used to establish model, and remaining 10 width are used to verify).It is compared, is analyzed by further progress
It is shown to experimental data as follows.1# standard soil sample is separated by overall spectrum intensity region, and vector is carried out to remaining sample
The analysis of machine algorithm, by choosing C-N key spectral line 5, C-C key spectral line 8, calcium atom spectral line 1, calcium ion spectral line 1, sodium is former
Sub- spectral line 2, Atomic Hydrogen Emission Line 1 correctly distinguish 2#, 3#, 4# sample, complete qualitative analysis.
And quantitative analysis can refer to following example: by the soil of the mixing oil sample of a certain oil reservoir and oil reservoir location ground
Earth sample (air-dried) is mixed into 10g in proportion, grinds 5min in mortar, takes 5g tabletted.Each sample adds up 100 width light
Spectrum carries out the conventional light such as peak-seeking, button background, averaging, line shape fitting, spectral strength sampling to collected original spectral data
Spectrum processing obtains effective spectroscopic data, deducts after pedotheque spectral background the peak characterized by the peak C-N388.2nm.Each sample
Concentration and characteristic peak spectral intensity see the table below.
| Sample number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Concentration (ppm) | 100 | 200 | 400 | 600 | 800 | 1200 | 1600 | 2000 |
| Absorbance | 1.526 | 2.690 | 4.785 | 6.510 | 8.050 | 9.560 | 14.700 | 16.080 |
Embodiment three
In addition, those skilled in the art can also carry out adding suitable quantity of water into pedotheque detection sequence, contained with obtaining difference
Laser induced breakdown spectroscopy data in the case of water rate in pedotheque detection sequence.Such as: with different water cut (0~60%)
On-site soil repeats above-mentioned quantitative test, does one group of quantitative experiment every 5%, obtains the equation of linear regression under the moisture content, and
Equation of linear regression is saved into spectra database in the completed.
The present invention provides a kind of the oil-contaminated soil rapid detection method based on laser induced breakdown spectroscopy, this method
Include to form sample to be tested, background sample, laser induced incandescence, collect laser induced breakdown spectroscopy signal, comparison data library,
Sample to be tested, background sample are parsed, analysis obtains the quantitative and qualitative result of contained oil product in sample to be tested.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (8)
1. a kind of oil-contaminated soil rapid detection method based on laser induced breakdown spectroscopy, which is characterized in that the detection
Method comprises the following steps that
Step 1: weighing oil-contaminated soil sample, form sample to be tested；It the not oil-containing pedotheque of quality such as weighs, forms background sample
This；
Step 2: focusing on sample to be tested, background sample respectively using laser beam；It is respectively formed sample to be tested, background sample
Gas ions simultaneously shine；
Step 3: collecting the laser induced breakdown spectroscopy signal and background sample of sample to be tested respectively using signal collection system
Laser induced breakdown spectroscopy signal；
Step 4: respectively by the laser induced breakdown spectroscopy signal of step 3 gained sample to be tested, step 3 gained background sample swash
The laser induced breakdown spectroscopy data included in photoinduction breakdown spectral signal and database are compared；According to position of spectral line and
The intensity of spectral line, parsing obtain the metallic element type and content information for including in sample to be tested, carbon, nitrogen, oxygen and its compound
Component content correlation information, and parsing obtain the metallic element type and content information for including in background sample, carbon, nitrogen,
Oxygen and its chemical composition content correlation information；
Step 5: the laser induced breakdown spectroscopy signal of comparison step 3 gained sample to be tested and swashing for step 3 gained background sample
Photoinduction breakdown spectral signal, in conjunction with the metallic element type and content information for including in step 4 gained sample to be tested, carbon,
The metallic element type for including in nitrogen, oxygen and its chemical composition content correlation information and step 4 gained background sample
With content information, carbon, nitrogen, oxygen and its chemical composition content correlation information, analysis obtains contained oil product in sample to be tested
Quantitative and qualitative result.
2. a kind of oil-contaminated soil rapid detection method based on laser induced breakdown spectroscopy according to claim 1,
It is characterized in that, further including having before the detection method step 1:
Step 0: weighing several pieces and quantify soil sample, be added without standard oil in first part of soil sample；From second part of soil
Sample starts that standard oil is added according to incremental adding proportion；After every part of sample mixes well, a pedotheque detection is formed
Sequence；
Parsing obtains the laser induced breakdown spectroscopy signal of each sample in pedotheque detection sequence, and induced with laser is added and hits
It wears in spectroscopic data database.
3. a kind of oil-contaminated soil rapid detection method based on laser induced breakdown spectroscopy according to claim 1,
It is characterized in that, the detection method further includes having:
Step 6: after step 5 analysis obtains the quantitative and qualitative result of contained oil product in sample to be tested, oil-contaminated soil region being done
Transversal scanning detection and multiple spot longitudinally deepen detection, and oil content and oil-containing soil in certain mass soil are obtained after weighted average
The area of earth.
4. a kind of oil-contaminated soil rapid detection method based on laser induced breakdown spectroscopy according to claim 1,
It is characterized in that, the step 2 further includes having: the focusing between adjustment laser beam and sample to be tested, laser beam and background sample
Distance, so that laser beam irradiation is close in the energy that the energy density on sample to be tested surface, laser beam irradiate on background sample surface
Degree reaches maximum.
5. a kind of oil-contaminated soil rapid detection method based on laser induced breakdown spectroscopy according to claim 2,
It is characterized in that, weighed soil sample is based on 14 basic classifications in China's soil.
6. a kind of oil-contaminated soil rapid detection method based on laser induced breakdown spectroscopy according to claim 2,
It is characterized in that, based on the standard oil being added obtains crude oil sample by different oil reservoir blocks exploitation place, and according to analogizing
Sample, oil field sample are mixed to metering room mixing sample, multi-purpose station mixing sample, petrol station.
7. a kind of oil-contaminated soil rapid detection method based on laser induced breakdown spectroscopy according to claim 2,
It is characterized in that, according to the laser induced breakdown spectroscopy signal of each sample in obtained pedotheque detection sequence, establish with
The equation of linear regression that characteristic spectral line intensity, pedotheque detection sequence Plays oil product adding proportion are characterized.
8. a kind of oil-contaminated soil rapid detection method based on laser induced breakdown spectroscopy according to claim 7,
It is characterized in that, selecting feature of the characteristic spectral line intensity as equation of linear regression corresponding to C-N388.2nm characteristic peak.
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| CN111488926A (en) * | 2020-04-07 | 2020-08-04 | 中国科学院南京土壤研究所 | Soil organic matter measuring method based on optimization model |
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