CN108760723A - A kind of detection method for the Portable element analyzer can be used for field exploration - Google Patents
A kind of detection method for the Portable element analyzer can be used for field exploration Download PDFInfo
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- CN108760723A CN108760723A CN201810503320.7A CN201810503320A CN108760723A CN 108760723 A CN108760723 A CN 108760723A CN 201810503320 A CN201810503320 A CN 201810503320A CN 108760723 A CN108760723 A CN 108760723A
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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
- G01N21/71—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited
- G01N21/73—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited using plasma burners or torches
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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
- G01N21/66—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light electrically excited, e.g. electroluminescence
- G01N21/67—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light electrically excited, e.g. electroluminescence using electric arcs or discharges
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
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Abstract
The invention discloses a kind of detection methods for the Portable element analyzer can be used for field exploration, including：Sampling system, electrolyte discharge plasma generation system, light path is collected and optical filtering separation system, data processing system and control system；The sampling system introduces the sample into the progress glow discharge of electrolyte discharge plasma generation system and sends out component spectrum, it is collected by the light path and optical filtering separation system acquires and reaches data processing system, finally is shown and acquired by the control system, the control system control sampling system, electrolyte discharge plasma generation system, light path collection and optical filtering separation system and data processing system.The present invention provides one kind without acidified sample in advance, is not necessarily to carrier gas, and electric discharge is more stable, easy to operate, and equipment is cheap and the metallic element analysis device of small volume.The detection method of the present invention, automatic to detect, easy to operate, field is adaptable, greatly improves field detection speed and precision.
Description
Technical field
The present invention relates to a kind of metallic element analysis devices, are specifically a kind of volume for fluid sample on-line checking
Smaller, cost is relatively low, the detection method of Portable element analyzer easy to operate.
Background technology
Metallic element context of detection in water, traditional detection method such as compleximetry, electrochemical process, inductive coupling atom
For emission spectrometry etc. often there is such or such shortcomings and deficiencies, it is huge, expensive to be embodied in equipment volume,
Pretreatment operation is complicated and is not easy to realize the real-time continuous detection to underwater gold category element, and the electrolyte aura risen in recent years
Discharge technology can exactly make up these disadvantages.Its basic structure is：Electrolyte solution is led by sampling device through one vertically
One end of pipe exports, and forms fountain, and nearby adds certain positive voltage with metal electrode above export end, to generate electric discharge
Plasma.Webb etc. reduces volume of plasma etc. and is improved to discharge system, used from cathodic surface area is reduced
" J " type flow-guiding type structure, volume of sample needed for constructed system discharge reduces, and reduces external circuit power, and system
The detectability of metallic element is then greatly improved, μ g/L and following are can reach.
But at present for electrolyte glow discharge technique research aspect, spectrographic detection part is all made of spectrometer progress
Acquisition and processing, for example portable light as the combination spectrum instrument of detector or is used using monochromatic spectroscope and photomultiplier
Spectrometer etc. so that a whole set of detection device volume is bigger than normal, high expensive, reduce rely on the metal of electrolyte glow discharge principle from
The portability of sub- detecting instrument, it is commonly used to limit electrolyte electric discharge electric discharge photoelectric detecting technology acquisition.
Invention content
In view of the technical drawbacks of the prior art, it is an object of the present invention to provide a kind of portable metallic elements to examine
Survey device and its detection method.
The technical solution adopted to achieve the purpose of the present invention is：
A kind of detection method using the Portable element analyzer that can be used for field exploration, the field that can be used for is surveyed
The Portable element analyzer of survey includes sampling system, and electrolyte discharge plasma generation system, light path, which is collected and filtered, divides
Select system, data processing system and control system；The sampling system introduces the sample into electrolyte discharge plasma and generates system
System carries out glow discharge and sends out component spectrum, is collected by the light path and optical filtering separation system acquires and reaches data processing system
System, is finally shown and is acquired by the control system, the control system control sampling system, electrolyte plasma discharging
Body generation system, light path collection and optical filtering separation system and data processing system；The light path, which is collected and filtered, sorts system
System is integrated in cage coaxial system, including the biconvex lens (2) being arranged successively along light path, spatial filter (3), preceding plano-convex are saturating
Mirror, spike filter and rear planoconvex spotlight, the emission spectrum that the electrolyte discharge plasma is sent out is by being located at plasma
Biconvex lens after body is collected and converges imaging to the spatial filter (3) after biconvex lens (2), spatial filter (3)
Select the main discharge luminous zone negative glow region of metallic element in plasma, then by being located at spatial filter (3) f2 afterwards
The directional light formula spectrum of negative glow region is converged to spike filter (5) by preceding planoconvex spotlight (4), then will by rear planoconvex spotlight (6)
Selected Characteristics of Metal Elements spectral collection converges on the photosurface of the photomultiplier after rear planoconvex spotlight (6), wherein
The focal length of biconvex lens be 3cm~10cm, f2 be preceding planoconvex spotlight focal length, f2 be 3cm~10cm, rear planoconvex spotlight structure with
Preceding planoconvex spotlight is identical, and the biconvex lens and planoconvex spotlight are that fused silica material is made；The spike filter
For the narrow bandpass interferometric filter of the installation on electronic optical filter wheel, the thang-kng center of bandwidth 5-30nm, and spike filter
Wavelength is the launch wavelength of metallic element resonance line；The electronic optical filter wheel is controllably connect with the control system with logical
It crosses and controls the stray light that the spike filter that electronic optical filter wheel selection corresponds to surveyed metallic element filters out its all band, select gold
Belong to elemental characteristic spectrum；
Detection method includes the following steps,
1) two are controlled according to the experimental calibration value of the pH value or not-acidified sample and standard acid measured in cushion chamber
The rotating speed of a single channel peristaltic pump makes the pH value of solution after mixing be to adjust the mixed proportion of sample to be tested and standard acid
1；
2) solution enters conduit under the pressure of single channel peristaltic pump by cushion chamber after mixing, and the buffering ball in conduit is into one
Step slackens the pulsation of solution；
3) power supply that control system control lithium battery is constituted with transformer provides operating voltage to glow discharge atomizer
And control electric injection valve and push down on the flow velocity for accelerating solution with compressing gasbag, make solution from capillary glass tube spray to
Automatic ignition；
4) control system controls electronic optical filter wheel rotation to select the spike filter of corresponding surveyed metallic element to filter out
The stray light of its all band selects Characteristics of Metal Elements spectrum；
5) three-dimensional adjusting device of control system control installation electrolyte discharge plasma excitation light source, realizes electrolyte
Discharge plasma excitation light source is collected with light path and the relative displacement of optical filtering separation system, obtains Characteristics of Metal Elements spectrum
Optimum signal；
6) light that the photomultiplier acquisition in data processing system is collected through light path and optical filtering separation system comes thoroughly converts
For electric signal, data are stored by data collector after current amplifier amplifies, are arrived by Bluetooth function by data transmission is stored
Computer or other-end equipment are simultaneously analyzed data and are handled；
7) step 4, step 5 and 6 are repeated until measuring the data of predetermined-element.
The sampling system includes two not-acidified sample and standard acid to be pumped into the list of cushion chamber respectively
Multi-channel peristaltic pump, one end are connected to the capillary that the other end is connected to electrolyte discharge plasma generation system with the cushion chamber
The conduit of glass tube, multiple buffering balls being accommodated in the conduit and plasmaassisted generation device, it is described
Plasmaassisted generation device includes the air bag being serially connected between conduit and glass capillary, be arranged on the air bag and with
The automatically controlled introduction valve that the control system controllably connects, the rotating speed of the single channel peristaltic pump is respectively by the control system control
System.
Data processing system includes photomultiplier, current amplifier and data collector.
The buffering ball is made of glass or acid resisting material, and buffering ball is positioned in horizontal positioned conduit, buffering ball
The 3/4-4/3 of a diameter of conduit diameter.
The spatial filter is the optical slot that length is 1~5mm, width is 50 μm~100 μm, and spatial filter
Upper and lower spatial position is adjustable.
Data collector also has WiFi and/or Bluetooth transmission function, the data collector storage in the analyzer
Measurement result simultaneously passes through progress data wireless transmission.
Compared with prior art, the beneficial effects of the invention are as follows：
The present invention provides one kind without acidified sample in advance, is not necessarily to carrier gas, more stable, easy to operate, equipment of discharging
Cheap and small volume metallic element analysis device.
The detection method of the present invention, automatic to detect, easy to operate, field is adaptable, greatly improves field detection speed
And precision.
Description of the drawings
Fig. 1 show a kind of structural schematic diagram of Portable element analyzer of the present invention；
Fig. 2 show sampling system structural schematic diagram.
Specific implementation mode
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.It should be appreciated that described herein
Specific embodiment be only used to explain the present invention, be not intended to limit the present invention.
As shown in Figs. 1-2, a kind of Portable element analyzer of the invention includes：Sampling system, electrolyte electric discharge etc. from
Daughter generation system, light path is collected and optical filtering separation system, data processing system and control system；Described electrolyte electric discharge etc.
Gas ions generation system includes power supply, transformer 16 and the glow discharge atomizer 1 that lithium battery is constituted with transformer, and light path is received
Collection and optical filtering separation system include biconvex lens 2, spatial filter 3, planoconvex spotlight 4 and 6 and spike filter 5, described
Light path is collected and optical filtering separation system includes photomultiplier 7 and current amplifier 8 and transformer 17, data processing system
For data collector 9 bluetooth-capable, control line device in order to control, such as computer 10, the sampling system packet
Include single channel peristaltic pump 11,12,15, Sample Buffer chamber 13, sample introduction buffering and plasmaassisted generation device 14, i.e. single channel
Peristaltic pump 11,12,15, Sample Buffer chamber 13 and sample introduction buffering and 14 composition analyzer of plasmaassisted generation device
Sampling system, the action of single channel peristaltic pump 11,12,15 and plasmaassisted generation device in sampling system is by controlling
System, as computer 10 controls.
The electrolyte discharge plasma generation system of analyzer is by electrolyte glow discharge atomizer 1 and transformer 16
Composition, additional 12V lithium batteries provide an input voltage, and the high pressure exported by transformer 16 provides a job to discharge system
The output voltage of voltage, transformer is controlled by computer 10.That is, entire elemental analyser is by 12V lithium battery power supplies.Lithium battery and
Transformer provides operating voltage for glow discharge atomizer, carries out glow discharge to the sample entered by sampling system, generates
Discharge plasma sends out elemental characteristic spectrum.
The light path that biconvex lens 2, spatial filter 3, planoconvex spotlight 4 and 6, spike filter 5 form, which is collected and filtered, divides
It selects system to be acquired elemental characteristic spectral line, and is adopted by photomultiplier 7, current amplifier 8, data bluetooth-capable
The spectral signal that optical system is collected is converted into electric signal and is acquired and stores by the data processing system that storage 9 forms.
Data collector 9 and data storage, transmission and calculating analysis center that computer 10 is entire analyzer, computer
Sampling system, electrolyte discharge plasma generation system are controlled, while controlling the electricity in light path collection and optical filtering separation system
Dynamic optical filter wheel rotation selects the spike filter of corresponding surveyed metallic element and controls the output voltage of transformer 17 to be light
Electric multiplier tube 7 provides operating voltage.Data collector acquires and the data stored pass through Bluetooth transmission to computer or other ends
End equipment carries out data analysis and process, to obtain metallic element concentration in sample to be tested.
It is used as and is swashed using electrolyte glow discharge low in energy consumption, without assisting gas and working under atmospheric pressure in this programme
It rises, than the portability advantage that other plasma exciatiaon sources such as ICP, MIP and DBD have bigger, especially suitable for portable instrument
Device.It is in field exploration salt lake according to this portable instrument, it can be achieved that being used for the portable metallic element analyzer of field exploration
The metals mineral resources such as metallic potassium mine and lithium mine provides the fast measurement device at scene, has great application value.
The elemental analyser constituted based on said program is as follows in the process for carrying out element determination：
Computer 10 controls the rotating speed of single channel peristaltic pump 11,12 in sampling system, respectively by sample to be tested and standard acid
Solution is pumped into Sample Buffer chamber 13 and forms the sample to be tested that pH value is 1 in Sample Buffer chamber 13, and sample to be tested is through plasma
Body auxiliary generation device 14 enters electrolyte electric discharge atomizer 1, and the control of computer 10 is made of lithium battery and transformer 16
Power supply to electrolyte discharge plasma generation system provide operating voltage and control the automatically controlled introduction valve 21 on air bag 20 to
Lower promotion makes sample to be tested be sprayed from glass capillary upper end to automatic ignition, generates discharge plasma, be not required to to be measured
Sample is modulated in advance, simplifies detecting step, and automatic ignition further increases the convenience of field operation.
The elemental characteristic spectral line that plasma emission goes out by biconvex lens 2, spatial filter 3, planoconvex spotlight 4 and 6, it is narrow
It is collected with the light path that optical filter 5 forms and optical filtering separation system enters photomultiplier 7 and is converted into electric signal, through Current amplifier
Device 8 is acquired and is stored to data by data collector 9 after amplifying, and computer 10 is transferred data to by its Bluetooth function
Or metallic element concentration to be measured is calculated in other-end equipment.
Sample to be tested and acid solution are pumped by the sampling system in the elemental analyser using two single channel peristaltic pumps leads
Pipe makes acid solution and sample to be tested collect and be formed the standard that pH is 1 in Sample Buffer chamber by controlling two wriggling revolution speeds
Sample solution, standard sample after the conduit current stabilization for being placed with buffering ball through entering glow discharge atomizer.The present invention utilizes two
Not-acidified sample to be tested and standard acid are introduced conduit by the sampling structure of a single channel peristaltic pump so that sample is not required in advance
Acidification, then the conduit by being placed with buffering ball so that sample more stably flows in conduit, finally enters electrolyte electric discharge etc.
Gas ions generation system so that electric discharge is more stable.
The elemental analyser uses the plasmaassisted generation device that the air bag with automatically controlled introduction valve forms simultaneously, leads to
Computer control valve is crossed to realize automatic ignition.
The light of metallic element in discharge plasma is extracted in the light path system of elemental analyser using spatial filter
The spectral signal for composing emitter region improves the signal-to-background ratio of signal reception, to improve the detection sensitivity of the analyzer.
Since electrolyte glow discharge plasma emission spectrum is less, and different metal element spectral line separation compared with
Width, the elemental analyser replace traditional monochromatic spectroscope using spike filter so that its structure is simpler, and volume is more
Small, operation is more convenient, and product price is cheaper.
The elemental analyser collects optical signal using quartz lens, is aided with spike filter and photomultiplier selected characteristic
Spectral signal simultaneously converts thereof into electric signal by the progress data acquisition of follow-up data processing system and handles, and is ensureing accuracy of detection
While make light path system and data processing system volume smaller, convenient for integrated, while reducing detection device cost.
Concrete structure is inside the elemental analyser：Single channel peristaltic pump 11,12 in the sampling system with it is described
Cushion chamber 13 is connected to, and the conduit 19 by placing multiple buffering balls 18 is connected to the hair of electrolyte discharge plasma generation system
Thin glass tube, the plasmaassisted generation device include and the air bag being serially connected between conduit and glass capillary
20, the automatically controlled introduction valve 21 controllably being connect with the control system is provided on the air bag 20；The light path is received
Collection and optical filtering separation system include the biconvex lens 2 being arranged successively along light path, spatial filter 3, preceding planoconvex spotlight 4, narrowband filter
Mating plate 5 and rear planoconvex spotlight 6, the emission spectrum that the plasma is sent out are collected by the biconvex lens 1 positioned at plasma
And imaging is converged to the spatial filter 3 after biconvex lens 1 is located at, if plasma is before biconvex lens 1 2f1 at, space is filtered
Wave device be located at after biconvex lens at 2f1 at etc. big picture, spatial filter select the main discharge area negative glow of plasma
Area, then the directional light formula spectrum of negative glow region is converged into narrowband filter by the preceding planoconvex spotlight 4 of the f2 after spatial filter 3
Mating plate, then selected Characteristics of Metal Elements spectral collection is converged into the photoelectricity after rear planoconvex spotlight 6 times by rear planoconvex spotlight 6
On the photosurface for increasing pipe 7.The focal length f1 for being wherein biconvex lens is 3cm~10cm, and preceding planoconvex spotlight and rear planoconvex spotlight are complete
Identical, focal length f2 is 3cm~10cm, and the biconvex lens and planoconvex spotlight are that fused silica material is made.The number
Include photomultiplier 7, current amplifier 8 and data collector 9 with WiFi and Bluetooth function according to processing system, uses
To obtain and store the current strength of each element, set to computer 10 or other-end by Bluetooth function by data transmission is stored
It is standby, to quantitative analysis metal element content therein.Meanwhile waste liquid is discharged into waste liquid pool through single channel peristaltic pump 15.
I.e. not-acidified sample to be tested and acid solution enter conduit through single channel peristaltic pump respectively, by controlling two peristaltic pumps
Rotating speed makes acid solution and sample to be tested collect and be formed the standard sample solution that pH is 1 in Sample Buffer chamber, and standard sample is through putting
Glow discharge atomizer is entered after the conduit current stabilization for having buffering ball, the present invention utilizes the sample introduction knot of two single channel peristaltic pumps
Not-acidified sample to be tested and acid solution are introduced conduit by structure so that sample is not required to be acidified in advance, then by being placed with leading for buffering ball
Pipe so that sample more stably flows in conduit, finally enters electrolyte discharge plasma generation system so that electric discharge is more
For stabilization.
Preferably, the sampling system include two single channel peristaltic pumps, be equipped with buffering ball conduit, Sample Buffer chamber with
And plasmaassisted generation device, the plasmaassisted generation device includes the air bag with automatic valve, described compacted
The action of dynamic pump and plasmaassisted generation device is controlled by control system.
Preferably, the spike filter be electronic optical filter wheel on spike filter, the electronic optical filter with
Controllably connection rotates the narrowband that optical filter wheel selects corresponding surveyed metallic element to the control system to pass through computer control
Optical filter filters out the stray light of its all band, selects Characteristics of Metal Elements spectrum.
Wherein, the width of the spatial filter adjustable, work of the spatial filter in for 50 μm~100 μ ms
With being plasma after biconvex lens is imaged where spatial filter, to the main discharge area of discharge plasma
Spatial selectivity.Meanwhile the electrolyte discharge plasma generation system setting is in height and front and back adjustable support
On frame.
Preferably, the biconvex lens, spatial filter, preceding planoconvex spotlight, spike filter, rear planoconvex spotlight and photoelectricity
Multiplier tube fixation is integrated in a cage coaxial system, ensures that all optical devices are concentric and position is fixed, convenient for adjusting.
Preferably, the elemental analyser further includes data collector bluetooth-capable, the data collector with
Current amplifier is connected, and collects storage data, and transmit number by Bluetooth function external computer or other-end equipment
According to convenient for data analysis and processing.
The present invention passes through control system by electrolyte discharge plasma generation system and a set of adjustable supporting rack of three-dimensional
It unites to adjust the relative displacement of plasma generating system and light path collection and optical filtering separation system, while being aided with and adjusting space filter
Wave device width, observation signal is strong and weak, so as to select optimal discharge position, need not adjust subsequent optical path collection device, make
It is more convenient to obtain set detection device operation.Spatial choice is carried out using the region of spatial filter plasma, passes through tune
Section adjusts plasma generating system and selects mainly putting for plasma with light path collection and the relative displacement of optical filtering separation system
Electric region, the i.e. negative glow region of plasma, allow effective optical signal adequately to enter photomultiplier, to improve signal
The signal-to-background ratio of reception, improves the detection sensitivity of the set elemental analyser, and spatial filter coordinates the detection device of optical filter
Keep the more existing photoelectric detection system volume smaller of the set analyzer, equipment also less expensive.
In conclusion the light path of the elemental analyser that can be used for field exploration of the present invention is collected and optical filtering separation system,
Different from adding the detection technique of photomultiplier using monochromatic spectroscope in the prior art, the present invention is using quartz lens, space
Filter and spike filter replace monochromatic spectroscope, in the case where equally having high light spectral resolution so that a whole set of inspection
Examining system cheaper, volume smaller make the detecting system in conjunction with three-dimensional adjustable electrolyte discharge plasma generation system
It is simpler and more convenient to operate.
Specific detection method, includes the following steps,
1) two are controlled according to the experimental calibration value of the pH value or not-acidified sample and standard acid measured in cushion chamber
The rotating speed of a single channel peristaltic pump makes the pH value of solution after mixing be to adjust the mixed proportion of sample to be tested and standard acid
1；Two single channel peristaltic pumps of adjust automatically can be realized with the pH meter of control system communication connection that is, can be arranged in cushion chamber
Rotating speed cooperation；
2) solution enters conduit under the pressure of single channel peristaltic pump by cushion chamber after mixing, and the buffering ball in conduit is into one
Step slackens the pulsation of solution；
3) power supply that control system control lithium battery is constituted with transformer provides operating voltage to glow discharge atomizer
And control electric injection valve and push down on the flow velocity for accelerating solution with compressing gasbag, make solution from capillary glass tube spray to
Automatic ignition；
4) control system controls electronic optical filter wheel rotation to select the spike filter of corresponding surveyed metallic element to filter out
The stray light of its all band selects Characteristics of Metal Elements spectrum；
5) three-dimensional adjusting device of control system control installation electrolyte discharge plasma excitation light source, realizes electrolyte
Discharge plasma excitation light source is collected with light path and the relative displacement of optical filtering separation system, obtains Characteristics of Metal Elements spectrum
Optimum signal.
6) light that the photomultiplier acquisition in data processing system is collected through light path and optical filtering separation system comes thoroughly converts
For electric signal, data are stored by data collector after current amplifier amplifies, are arrived by Bluetooth function by data transmission is stored
Computer or other-end equipment are simultaneously analyzed data and are handled；
7) step 4, step 5 and 6 are repeated until measuring the data of predetermined-element.
The elemental analyser of the present invention realizes adjust automatically liquid pH value and automatic ignition and test constantly, while can
Adjust automatically optical filter realizes that multielement measures successively, effectively increases measurement efficiency, reduces use cost.
The above is only a preferred embodiment of the present invention, it is noted that for the common skill of the art
For art personnel, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications
Also it should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of detection method using the Portable element analyzer that can be used for field exploration, which is characterized in that described can
Portable element analyzer for field exploration includes sampling system, electrolyte discharge plasma generation system, light path receipts
Collection and optical filtering separation system, data processing system and control system；The sampling system introduce the sample into electrolyte electric discharge etc. from
Daughter generation system carries out glow discharge and sends out component spectrum, is collected by the light path and optical filtering separation system acquires and reaches number
It according to processing system, is finally shown and is acquired by the control system, the control system control sampling system, electrolyte are put
Electro-plasma generation system, light path collection and optical filtering separation system and data processing system；The light path is collected and filter
Light separation system is integrated in cage coaxial system, including the biconvex lens (2) being arranged successively along light path, spatial filter (3),
Preceding planoconvex spotlight, spike filter and rear planoconvex spotlight, the emission spectrum that the electrolyte discharge plasma is sent out is by position
Biconvex lens after plasma is collected and converges imaging to the spatial filter (3) after biconvex lens (2), space filter
Wave device (3) selects the main discharge luminous zone negative glow region of metallic element in plasma, then by being located at spatial filter (3) after
The directional light formula spectrum of negative glow region is converged to spike filter (5) by the preceding planoconvex spotlight (4) at f2, then by rear planoconvex spotlight
(6) selected Characteristics of Metal Elements spectral collection is converged on the photosurface of the photomultiplier after rear planoconvex spotlight (6),
Wherein the focal length of biconvex lens is 3cm~10cm, and f2 is the focal length of preceding planoconvex spotlight, and f2 is 3cm~10cm, rear planoconvex spotlight knot
Structure is identical with preceding planoconvex spotlight, and the biconvex lens and planoconvex spotlight are that fused silica material is made；The narrowband filter
Mating plate is the narrow bandpass interferometric filter of the installation on electronic optical filter wheel, bandwidth 5-30nm, and the thang-kng of spike filter
Centre wavelength is the launch wavelength of metallic element resonance line；The electronic optical filter wheel is controllably connect with the control system
To filter out the stray light of its all band, choosing by controlling the spike filter of electronic corresponding the surveyed metallic element of optical filter wheel selection
Go out Characteristics of Metal Elements spectrum；
Detection method includes the following steps,
1) two lists are controlled according to the experimental calibration value of the pH value or not-acidified sample and standard acid measured in cushion chamber
For the rotating speed of multi-channel peristaltic pump to adjust the mixed proportion of sample to be tested and standard acid, it is 1 to make the pH value of solution after mixing；
2) solution enters conduit under the pressure of single channel peristaltic pump by cushion chamber after mixing, and the buffering ball in conduit further disappears
The pulsation of weak solution；
3) power supply that control system control lithium battery is constituted with transformer provides operating voltage to glow discharge atomizer and controls
Electric injection valve processed pushes down on the flow velocity for accelerating solution with compressing gasbag, and solution is made to be sprayed from capillary glass tube to automatic
Igniting；
4) control system controls electronic optical filter wheel rotation to select the spike filter of corresponding surveyed metallic element to filter out other
The stray light of wave band selects Characteristics of Metal Elements spectrum；
5) three-dimensional adjusting device of control system control installation electrolyte discharge plasma excitation light source, realizes electrolyte electric discharge
Plasma exciatiaon light source is collected with light path and the relative displacement of optical filtering separation system, obtains the best of Characteristics of Metal Elements spectrum
Signal；
6) light that the photomultiplier acquisition in data processing system is collected through light path and optical filtering separation system comes thoroughly is converted into electricity
Signal stores data after current amplifier amplifies by data collector, and data transmission will be stored to calculating by Bluetooth function
Machine or other-end equipment are simultaneously analyzed data and are handled；
7) step 4, step 5 and 6 are repeated until measuring the data of predetermined-element.
2. detection method as described in claim 1, which is characterized in that the sampling system includes two to respectively will not
Acidified sample and standard acid are pumped into the single channel peristaltic pump of cushion chamber, and one end is connect with the cushion chamber connection other end
To the conduit of the glass capillary of electrolyte discharge plasma generation system, multiple bufferings being accommodated in the conduit
Ball and plasmaassisted generation device, the plasmaassisted generation device include being serially connected in conduit and capillary glass
Air bag between glass pipe, the automatically controlled introduction valve for being arranged on the air bag and controllably being connect with the control system, the list
The rotating speed of multi-channel peristaltic pump is controlled by the control system respectively.
3. detection method as described in claim 1, which is characterized in that data processing system includes that photomultiplier, electric current are put
Big device and data collector.
4. detection method as described in claim 1, which is characterized in that the buffering ball is made of glass or acid resisting material,
Buffering ball is positioned in horizontal positioned conduit, the 3/4-4/3 of a diameter of conduit diameter of buffering ball.
5. detection method as described in claim 1, which is characterized in that the spatial filter be length be 1~5mm, width
For 50 μm~100 μm of optical slot, and spatial position is adjustable up and down for spatial filter.
6. detection method as described in claim 1, which is characterized in that data collector also has WiFi in the analyzer
And/or Bluetooth transmission function, the data collector store measurement result and by carrying out data wireless transmission.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810503320.7A CN108760723B (en) | 2016-03-21 | 2016-03-21 | Detection method of portable element analyzer for field survey |
Applications Claiming Priority (2)
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| CN106290310A (en) * | 2016-09-27 | 2017-01-04 | 华中科技大学 | A kind of low cost highly sensitive laser microprobe elemental analyser |
| CN110658182A (en) * | 2018-06-28 | 2020-01-07 | 中国科学院上海硅酸盐研究所 | Portable metal ion water quality analyzer and detection method thereof |
| CN109406493A (en) * | 2018-09-21 | 2019-03-01 | 中国地质大学（武汉） | A kind of portable fluid cathode glow discharging heavy metal detector and detection method |
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| CN105675585B (en) | 2018-07-03 |
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