CN107389708A - A kind of Liquid sample introduction bottle and Liquid sample introduction method for zone X ray detecting XRF - Google Patents
A kind of Liquid sample introduction bottle and Liquid sample introduction method for zone X ray detecting XRF Download PDFInfo
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- CN107389708A CN107389708A CN201710500841.2A CN201710500841A CN107389708A CN 107389708 A CN107389708 A CN 107389708A CN 201710500841 A CN201710500841 A CN 201710500841A CN 107389708 A CN107389708 A CN 107389708A
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- liquid
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- sample introduction
- liquid sample
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
- G01N23/20008—Constructional details of analysers, e.g. characterised by X-ray source, detector or optical system; Accessories therefor; Preparing specimens therefor
-
- 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
- G01N1/36—Embedding or analogous mounting of samples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
- G01N23/207—Diffractometry using detectors, e.g. using a probe in a central position and one or more displaceable detectors in circumferential positions
- G01N23/2076—Diffractometry using detectors, e.g. using a probe in a central position and one or more displaceable detectors in circumferential positions for spectrometry, i.e. using an analysing crystal, e.g. for measuring X-ray fluorescence spectrum of a sample with wavelength-dispersion, i.e. WDXFS
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/05—Investigating materials by wave or particle radiation by diffraction, scatter or reflection
- G01N2223/056—Investigating materials by wave or particle radiation by diffraction, scatter or reflection diffraction
- G01N2223/0568—Investigating materials by wave or particle radiation by diffraction, scatter or reflection diffraction spectro-diffractometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/10—Different kinds of radiation or particles
- G01N2223/101—Different kinds of radiation or particles electromagnetic radiation
- G01N2223/1016—X-ray
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/30—Accessories, mechanical or electrical features
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/60—Specific applications or type of materials
- G01N2223/637—Specific applications or type of materials liquid
Abstract
The invention discloses a kind of Liquid sample introduction bottle for zone X ray detecting XRF,The Liquid sample introduction bottle includes bottle and the bottle cap with circle center hole,The Liquid sample introduction bottle and its Liquid sample introduction method of sandwiched hyaline membrane between the bottle cap and bottle,This method energy direct measurement liquid,Solve the problems, such as the stability of sample and focusing,And remain batch processing ability,The surface tension of liquid when present invention solves the measurement of zone X ray detecting XRF,Accurate focusing,Batch is focused,The problems such as helium disturbs,The present invention can be directly applied for the detection of solid-state and liquid sample,Make to irradiate zone X ray detecting XRF in the ability and batch processing ability that original solid-state direct quantitative is analyzed,It is set to be also equipped with liquid (aqua,Emulsion,Finish) direct quantitative analysis ability and batch processing ability,Cosmetics or the detection and analysis of other aqueous solution can be applied to,Greatly expand the scope of application of zone X ray detecting XRF.
Description
Technical field
The present invention relates to a kind of sample injection bottle and sample injection method, more particularly to it is a kind of for zone X ray detecting XRF
Liquid sample introduction bottle and Liquid sample introduction method.
Background technology
Zone X ray detecting XRF is the more special a kind of product of X-ray fluorescence spectra (XRF) analysis field, it
Obtaining the elemental constituent of sample tiny area and distribution characteristics, application by flexible structure and lossless detection includes ring
The research fields such as border, archaeology, criminal investigation, material, Industrial quality control, biology, it is current X ray spectroscopy area research in the world
Focus.
At present for the application present situation of X fluorescence spectrum analysis, it is largely focused on solid sample.Except in petrochemical industry
Field has outside the direct measurement of oil product, and only report also substantially switchs to solid phase measurement using by fluid sample.And it can look into
That arrives uses XRF analysis liquid technology, and the instrument of use is all lower irradiation instrument, and when measuring liquid, specimen cup support membrane, which has, oozes
The risk of rupture is leaked, can shine into spectrum chamber contamination and damage；And X fluorescence auto injections abandon sampling device and are not also suitable for microcell X-fluorescence
Liquid sample introduction.
At present, what X-fluorescence fluid sample analysis used is all the larger specimen cup of bore.This specimen cup instrument can be
Focused on film, but liquid level is influenceed to be consistent by snap ring assembling, it the problem of be to discharge in time it is unnecessary
Liquid, conventional X-fluorescence can be applicable, but for that can influence its accuracy during the measurement of microcell X-fluorescence.
Zone X ray detecting XRF is a kind of instrument of adjustable structure, and Multi-example can be realized using mobile platform
Auto injection, but error caused by three-dimensional platform movement, error caused by naked eyes all influences its quantitative analysis during focusing.Therefore
Fluid sample wants direct injected to must pull against accurate focusing and batch two problems of focusing, wherein accurate focusing is laser to be solved
Shine on liquid and ghost image occur, become the problem of big, disappearance etc. can not focus, and liquid level vibration problems caused by protective gas,
Batch focusing is that to solve the problems, such as how to allow the liquid level of all samples to be maintained in a height.
There are many problems in zone X ray detecting XRF direct measurement fluid sample, for example surface tension of liquid causes
Liquid level it is uneven, difficult, liquid fluctuating etc. caused by protective gas of being focused caused by reflective too small or too big." extraction ", it is " rich
Collection ", " filter paper " liquid sample making technology are traditional XRF fluid analysis technologies, RafalSitko, Shukuro Igarashi etc.
By this technology with this quasi-instrument, and Thomasin C. Miller etc. propose " automatic printing " technology, Kathryn
G.Mclntosh etc. proposes technologies such as " micro-fluidic chips ", and detection is quantitatively criticized for fluid sample and provides new approaches, but these skills
Art is not direct measurement liquid, still maintains liquid and becomes solid and then the thinking detected again.
The content of the invention
The present invention provides one kind for solution above mentioned problem of the prior art can be directly applied for fluid sample, and can adopt
Measured with irradiation, measurement accuracy is high, measurement liquid level is smooth, and can continuous sample introduction be used for microcell X ray fluorescence spectrometers
Liquid sample introduction bottle and its Liquid sample introduction method.
To achieve the above object, the present invention uses following technical scheme：
A kind of Liquid sample introduction bottle for zone X ray detecting XRF, the Liquid sample introduction bottle include bottle and with circles
The bottle cap in heart hole, sandwiched hyaline membrane between the bottle cap and bottle.
In order to further optimize above-mentioned technical proposal, the technical measures that the present invention is taken are：
Preferably, the bottle is cylinder, and the bottle and bottle cap set the threaded portion to match；
Preferably, the bottle cap is provided with scrobicular ring along circle center hole；Under the downward annular pressure of scrobicular ring, make the range of stretch of film
Further reduce, make film surface more smooth；
Preferably, the zone X ray detecting XRF is focusing small focal spot x-ray XRF；
Preferably, the hyaline membrane is wheat membrane；
Present invention also offers a kind of Liquid sample introduction method for zone X ray detecting XRF, the Liquid sample introduction
Method concretely comprises the following steps：
Step 1：Pre-treatment
When detected sample liquid is aqua or emulsion, check whether it has bubble or liquid layered, have then clear with ultrasonic wave
Washing machine carry out defoaming and it is homogeneous；
Step 2：Fill sample
The sample liquid that step 1 is handled well loads described Liquid sample introduction bottle, and sample liquid is filled into Liquid sample introduction bottle, profit
With surface tension of liquid make liquid level in meniscus it is slightly higher cross bottleneck, the transparent plastic mulching after Liquid sample introduction bottle bottleneck liquid level,
Bottle cap is screwed in smooth-going, and hyaline membrane can be pulled it is close to liquid level, keeps film surface smooth, completes dress sample；
Step 3：Data acquisition
The Liquid sample introduction bottle that step 2 is handled well is positioned on sample stage, laser focusing, measures sample, gathered data.
Present invention also offers a kind of Liquid sample introduction method for zone X ray detecting XRF, the Liquid sample introduction
Method concretely comprises the following steps：
Step 1：Pre-treatment
When detected sample is solid, sample is dissolved with water dissolving or after being ashed with water, records the proportion of sample and water,
Then at once using or be transferred to standby in vial with cover；
Step 2：Fill sample
The sample liquid that step 1 is handled well loads described Liquid sample introduction bottle, and sample liquid is filled into Liquid sample introduction bottle, profit
With surface tension of liquid make liquid level in meniscus it is slightly higher cross bottleneck, the transparent plastic mulching after Liquid sample introduction bottle bottleneck liquid level,
Bottle cap is screwed in smooth-going, and hyaline membrane can be pulled it is close to liquid level, keeps film surface smooth, completes dress sample；
Step 3：Data acquisition
The Liquid sample introduction bottle that step 2 is handled well is positioned on sample stage, the focusing of zone X ray detecting XRF laser,
Measure sample, gathered data；
Preferably, it is upper irradiation mensuration sample to be measured in the step 3；
Preferably, the sample stage sets the sample holes of at least one sample injection bottle；
Preferably, zone X ray detecting XRF can be carried out continuously the data acquisition of sample bottle in the step 3；
Preferably, the zone X ray detecting XRF is the focusing small focal spot x-ray fluorescence spectrum of MIDEX SD types
Instrument；
Preferably, the zone X ray detecting XRF analyst coverage is Na~U, upper irradiating structure, Mo target X-ray tubes,
Peak power 30W, maximum voltage 48kV, Si drift detector, detection range 2mm；
Preferably, the zone X ray detecting XRF is loading sample once, continuous sample introduction, starts according to measuring condition and surveys
Range sequence, data acquisition and result calculate；
The present invention uses above-mentioned technical proposal, compared with prior art, has the following technical effect that：
The present invention measures fluid sample for zone X ray detecting XRF and proposes a kind of new sample injection method-" bottleneck
Film applicator coating ", sample is loaded with the sample bottle with circle center hole bottle cap, consolidates liquid level with Mylar films (wheat membrane, a kind of polyester film),
This method direct measurement liquid, solves the problems, such as the stability of sample and focusing, and remain batch processing ability；The present invention
Interior scrobicular ring is additionally provided with the center of circle hole site of bottle cap, can preferably make hyaline membrane stress equalization, it is more smooth；The present invention solves
When zone X ray detecting XRF measures the problems such as surface tension of liquid, accurate focusing, batch focusing, helium interference, the present invention
The detection of solid-state and liquid sample can be directly applied for, makes irradiation zone X ray detecting XRF direct in original solid-state
In the ability and batch processing ability of quantitative analysis, it is set to be also equipped with the energy of liquid (aqua, emulsion, finish) direct quantitative analysis
Power and batch processing ability, cosmetics or the detection and analysis of other aqueous solution can be applied to, greatly expand zone X ray detecting
The application field and the scope of application of XRF.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the Liquid sample introduction bottle of preferred embodiment of the present invention；
Fig. 2 is a kind of structural representation of the Liquid sample introduction bottle with scrobicular ring of preferred embodiment of the present invention；
Fig. 3 is a kind of stereogram of the Liquid sample introduction bottle of preferred embodiment of the present invention；
Fig. 4 is a kind of top view of the Liquid sample introduction bottle of preferred embodiment of the present invention；
Fig. 5 is a kind of structural representation of the bottle cap with scrobicular ring of preferred embodiment of the present invention；
Reference therein is：
1 bottle；2 bottle caps；3 hyaline membranes；4 threaded portions；21 circle center holes；22 scrobicular rings.
Embodiment
The invention provides a kind of Liquid sample introduction bottle and its Liquid sample introduction method for zone X ray detecting XRF；
The present invention is described in more detail below by specific embodiment, for a better understanding of the present invention,
But following embodiments are not intended to limit the scope of the invention.
Embodiment one
As Figure 1-5, the present embodiment utilizes the Liquid sample introduction bottle and Liquid sample introduction method of zone X ray detecting XRF
Carry out the detection of bath salt solid sample.
1. instrument and measuring condition
The focusing small focal spot x-ray XRF (Spectro Analypical Instruments GmbH) of MIDEX SD types, analyze model
Enclose Na~U, upper irradiating structure, Mo target X-ray tubes, peak power 30W, maximum voltage 48kV, Si drift detector, detection range
2mm。
2. solid sample detects
The solid sample testing process of Xray fluorescence spectrometer：
Step 1：Pre-treatment
After bath salt sample is dissolved with water, the proportion of sample and water, stand for standby use are recorded；
Step 2：Fill sample
The sample liquid that step 1 is handled well loads the Liquid sample introduction bottle, and sample liquid is filled into Liquid sample introduction bottle, utilizes
Surface tension of liquid makes liquid level cross bottleneck in meniscus is slightly higher, after the hyaline membrane 3 is covered in Liquid sample introduction bottle bottleneck liquid level, puts down
Suitable screws on bottle cap 2, and hyaline membrane 3 can be pulled it is close to liquid level, keeps film surface smooth, completes dress sample；Liquid in film must be ensured
Face bubble-free, film surface are smooth.
Step 3：Data acquisition
The Liquid sample introduction bottle that step 2 is handled well is positioned on sample stage, the focusing of zone X ray detecting XRF laser,
Measure sample, gathered data；
4 bath salt samples are taken, are entered respectively with standard method GB/T 13025.5 and the present embodiment solid sample sample injection method
Row Comparability test, 3 Duplicate Samples are done, take its average value, data are shown in Table 1.By comparing the visible requirement for meeting general constant detection.
The bath salt standard method of table 1 and the methods and resultses of embodiment one compare
Embodiment two
As Figure 1-5, the present embodiment utilizes the Liquid sample introduction bottle and Liquid sample introduction method of zone X ray detecting XRF
Carry out aqua and the content detection of Pb, As in emulsion sample.
1. instrument and measuring condition
The focusing small focal spot x-ray XRF (Spectro Analypical Instruments GmbH) of MIDEX SD types, analyze model
Enclose Na~U, upper irradiating structure, Mo target X-ray tubes, peak power 30W, maximum voltage 48kV, Si drift detector, detection range
2mm。
2. fluid sample detects
The fluid sample testing process of the present embodiment Xray fluorescence spectrometer：
Step 1：
Checking detected sample, whether it has bubble or liquid layered, has, and with supersonic wave cleaning machine defoam and even
Matter；
Step 2：
The sample liquid that step 1 is handled well loads Liquid sample introduction bottle of the present invention, and sample liquid is filled into Liquid sample introduction
Bottle, liquid level is set to cross bottleneck in meniscus is slightly higher using surface tension of liquid, the hyaline membrane 3 is covered in Liquid sample introduction bottle bottleneck liquid
Behind face, bottle cap 2 is screwed in smooth-going, and hyaline membrane 3 can be pulled it is close to liquid level, keeps film surface smooth, completes dress sample；
Step 3：
The Liquid sample introduction bottle that step 2 is handled well is positioned on sample stage, laser focusing, measures sample, gathered data.
5 samples of aqua and emulsion (S5-S9) are selected, are used《Cosmetics safety technical specification》Chapter 4,1.6 section acceptance of the bid
Quasi- method (ICP-MS methods) is compared with the fluid sample detection method of the present embodiment two, and data are shown in Table 2, and data are shown and mark
Quasi- method is consistent substantially.
The liquid make-up standard method of table 2 and method A results compare
The specific embodiment of the present invention is described in detail above, but it is intended only as example, it is of the invention and unlimited
It is formed on particular embodiments described above.To those skilled in the art, it is any to the equivalent modifications that carry out of the present invention and
Substitute also all among scope of the invention.Therefore, the impartial conversion made without departing from the spirit and scope of the invention and
Modification, all should be contained within the scope of the invention.
Claims (10)
- A kind of 1. Liquid sample introduction bottle for zone X ray detecting XRF, it is characterised in that：The Liquid sample introduction bottle includes bottle Body (1) and the bottle cap (2) with circle center hole (21), sandwiched hyaline membrane (3) between the bottle cap (2) and bottle (1).
- 2. Liquid sample introduction bottle according to claim 1, it is characterised in that：The bottle (1) is cylindrical, the bottle (1) and bottle cap (2) sets the threaded portion (4) to match.
- 3. Liquid sample introduction bottle according to claim 1, it is characterised in that：The bottle cap (2) is provided with recessed along circle center hole (21) Ring (22).
- A kind of 4. Liquid sample introduction method for zone X ray detecting XRF, it is characterised in that：The Liquid sample introduction method Concretely comprise the following steps：Step 1：Pre-treatmentWhen detected sample liquid is aqua or emulsion, checks whether it has bubble or liquid layered, have, use supersonic wave cleaning machine Defoam and homogeneous；Step 2：Fill sampleThe sample liquid that step 1 is handled well loads any described Liquid sample introduction bottles of claim 1-3, and sample liquid is filled into liquid Body sample injection bottle, liquid level is set to cross bottleneck in meniscus is slightly higher using surface tension of liquid, the hyaline membrane (3) is covered in Liquid sample introduction After bottle bottleneck liquid level, bottle cap (2) is screwed in smooth-going, and hyaline membrane (3) can be pulled it is close to liquid level, is kept film surface smooth, is completed Fill sample；Step 3：Data acquisitionThe Liquid sample introduction bottle that step 2 is handled well is positioned on sample stage, laser focusing, measures sample, gathered data.
- A kind of 5. Liquid sample introduction method for zone X ray detecting XRF, it is characterised in that：The Liquid sample introduction method Concretely comprise the following steps：Step 1：Pre-treatmentWhen detected sample is solid, sample is dissolved with water dissolving or after being ashed with water, records the proportion of sample and water, then At once using or be transferred to standby in vial with cover；Step 2：Fill sampleThe sample liquid that step 1 is handled well loads any described Liquid sample introduction bottles of claim 1-3, and sample liquid is filled into liquid Body sample injection bottle, liquid level is set to cross bottleneck in meniscus is slightly higher using surface tension of liquid, the hyaline membrane (3) is covered in Liquid sample introduction After bottle bottleneck liquid level, bottle cap (2) is screwed in smooth-going, and hyaline membrane (3) can be pulled it is close to liquid level, is kept film surface smooth, is completed Fill sample；Step 3：Data acquisitionThe Liquid sample introduction bottle that step 2 is handled well is positioned on sample stage, the focusing of zone X ray detecting XRF laser, measurement Sample, gathered data.
- 6. the Liquid sample introduction method according to claim 4 or 5, it is characterised in that：It is upper that sample is measured in the step 3 Irradiate mensuration.
- 7. the Liquid sample introduction method according to claim 4 or 5, it is characterised in that：The sample stage sets at least one liquid Sample injection bottle sample holes.
- 8. Liquid sample introduction method according to claim 7, it is characterised in that：Zone X ray detecting fluorescence light in the step 3 Spectrometer can be carried out continuously the data acquisition of Liquid sample introduction bottle.
- 9. Liquid sample introduction bottle according to claim 1, it is characterised in that：The zone X ray detecting XRF is focusing The small focal spot x-ray XRF of formula.
- 10. Liquid sample introduction bottle according to claim 1, it is characterised in that：The hyaline membrane (3) is wheat membrane.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710500841.2A CN107389708B (en) | 2017-06-27 | 2017-06-27 | Liquid sample introduction bottle and liquid sample introduction method for micro-area X-ray fluorescence spectrometer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710500841.2A CN107389708B (en) | 2017-06-27 | 2017-06-27 | Liquid sample introduction bottle and liquid sample introduction method for micro-area X-ray fluorescence spectrometer |
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| CN107389708A true CN107389708A (en) | 2017-11-24 |
| CN107389708B CN107389708B (en) | 2020-05-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108645882A (en) * | 2018-04-25 | 2018-10-12 | 上海化工研究院有限公司 | X-ray fluorescence method measures the scaling method of sulfur content in sulfur-coated urea |
| CN110567759A (en) * | 2019-09-30 | 2019-12-13 | 安徽金联地矿科技有限公司 | Soil layered water sample collecting device and method thereof |
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| JPH10197460A (en) * | 1997-01-07 | 1998-07-31 | Mitsui Chem Inc | Flow cell for fluorescent x-ray analyzer |
| CN203385655U (en) * | 2013-07-04 | 2014-01-08 | 浙江福立分析仪器有限公司 | Water seal device in atomic absorption spectrometer |
| CN203405430U (en) * | 2013-08-15 | 2014-01-22 | 浙江工业大学 | Portable microbeam X-ray fluorescence spectrometer |
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2017
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Patent Citations (4)
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| JPH09311096A (en) * | 1996-05-24 | 1997-12-02 | Toshiba Corp | Solution sample-measuring apparatus |
| JPH10197460A (en) * | 1997-01-07 | 1998-07-31 | Mitsui Chem Inc | Flow cell for fluorescent x-ray analyzer |
| CN203385655U (en) * | 2013-07-04 | 2014-01-08 | 浙江福立分析仪器有限公司 | Water seal device in atomic absorption spectrometer |
| CN203405430U (en) * | 2013-08-15 | 2014-01-22 | 浙江工业大学 | Portable microbeam X-ray fluorescence spectrometer |
Non-Patent Citations (1)
| Title |
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| 邬蓓蕾等: "《直接进样X 射线荧光光谱法测定汽油中痕量锰和铁》", 《理化检验-化学分册》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108645882A (en) * | 2018-04-25 | 2018-10-12 | 上海化工研究院有限公司 | X-ray fluorescence method measures the scaling method of sulfur content in sulfur-coated urea |
| CN110567759A (en) * | 2019-09-30 | 2019-12-13 | 安徽金联地矿科技有限公司 | Soil layered water sample collecting device and method thereof |
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| Publication number | Publication date |
|---|---|
| CN107389708B (en) | 2020-05-26 |
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