CN103163116A - Liquid cathode glow discharge emission spectrum detection metal ion apparatus - Google Patents
Liquid cathode glow discharge emission spectrum detection metal ion apparatus Download PDFInfo
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- CN103163116A CN103163116A CN2013100720703A CN201310072070A CN103163116A CN 103163116 A CN103163116 A CN 103163116A CN 2013100720703 A CN2013100720703 A CN 2013100720703A CN 201310072070 A CN201310072070 A CN 201310072070A CN 103163116 A CN103163116 A CN 103163116A
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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
- G01N21/62—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
- G01N21/69—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 specially adapted for fluids, e.g. molten metal
Abstract
The invention relates to a liquid cathode glow discharge emission spectrum detection metal ion apparatus, which comprises a light source generation part used for generating glow discharge, a splitting system used for performing light splitting treatment on glow discharge emission spectrum generated by the light source generation part, a detection apparatus used for detecting the emission spectrum after light splitting treatment, and a data process system used for analyzing and processing the signals of the detection apparatus; wherein, the light source generation part comprises a metal anode connected to the anode of high voltage supply, a liquid pool filled with an electrolyte connected to the cathode of the high voltage supply; and a sample introduction unit, which comprises a sample introduction pipe which is vertically passed through the liquid pool, and the top of the sample introduction pipe is positioned below the metal anode; the sample introduction unit enables a solution to be measured to escape from the top of the sample introduction pipe, thereby the solution to be measured overflowed from the top of the sample introduction pipe and the metal anode form a glow discharge area.
Description
Technical field
The invention belongs to analytical chemistry spectral analysis field, relate to the device that a kind of liquid cathode grow discharge optical emission spectrometry detects metallic ion, the liquid cathode aura emission spectrum that is specifically related to a kind of under atmospheric pressure direct drive detects the device of metallic ion.
Background technology
Traditional metal ion inspection based on spectral technique mainly contains atomic absorption spectrography (AAS) and atomic emission spectrometry.Detecting instrument commonly used has flame atomic absorption spectrophotometer, inductive coupling plasma emission spectrograph etc.But these several detecting instruments commonly used are bulky, expensive, and testing cost is high, are difficult to use in open-air the analysis and monitoring.Along with the raising of development in science and technology and detection level, people begin one's study simply, metallic element Fast Detection Technique fast and cheaply, to realizing the metal residual in monitoring environment fast and effeciently, ensure people ' s health and ecological safety.Liquid cathode glow discharge optical emission spectrometry detection technique is a kind of like this technology just, receives increasing concern.Wherein, the potentiality of electrolytic solution negative electrode Atomospheric pressure glow discharge-atomic emission spectrum (Electrolysis Cathode Discharge-Atomic Emission Spectrometry, ELCAD-AES) in the application of reality are particularly outstanding.It depresses the plasma emission spectroscopy of discharge generation between anode and testing sample negative electrode by atmospheric sounding, realize the detection to metal ingredient in fluid sample.
In 1993, Cserfalvi etc. set up first electrolyte cathodic discharge system and are applied to the emission spectrographic analysis of effects of ion, and after this ELCAD has caused people's attention.Its structure forms, and electrolyte solution is derived by the transcatheter end of sampling device, shape such as fountain, and add certain positive voltage with metal electrode near derivation is held several millimeters, thus form the discharge generation plasma.In discharge process, solution in liquid electrode constantly is vaporized, thereby make the metallic ion that is dissolved in solution also enter into plasma and be excited, produce emission spectrum, so the emission spectrum that discharge produces is relevant with the solute composition in the solution electrode, therefore the detection by emission spectrum just can realize that GOLD FROM PLATING SOLUTION belongs to the detection of ion.Michael R.Webb etc. improve the ELCAD system, have simplified device, and its constructed device is called solution cathode glow discharging (Solution Cathode Glow Discharge, SCGD).Through constantly optimizing, detection limit improves greatly, and flow rate of liquid is reduced to 2.5ml/min.Domestic researcher Zhu Zhen profit etc. was also carried out improvement to the ELCAD device, and what relate to is a kind of electrically driven (operated) liquid medium barrier discharge (Dielectric Barrier Discharges, DBD) device that under atmospheric pressure exchanges.In this device, two electrodes adopt respectively tinsel or rod and metal plate to make, and insert a dielectric-slab between described two electrodes, and dielectric-slab covers the surface of metal plate electrode; Dielectric-slab plays dielectric impedance, and a platform that holds sample solution is provided simultaneously; Discharge produces between tinsel or rod and sample solution.Chinese patent CN1819737A discloses a kind of atmosphere medium barrier glow discharging plasma generating means, and it is external electrode that this device adopts conducting solution, consists of discharge loop with high-voltage power supply and electrode bar, and the plasma that produces is used for chemical vapor deposition.It is little, easy for installation that above-mentioned several system all has a volume, low cost and other advantages.In present research, agent structure in these single liquid electrode discharge systems is basically identical, have nothing in common with each other but produce on isoionic mode, as adopting " J " type flow-guiding type in the SCGD of Michael R.Webb, the alternating current of Zhu Zhenli drives DBD etc., therefore constantly have the researcher that these systems are further improved, improve the stability that produces plasma.But, the detection of said system application and metallic ion is also rarely had report.
Summary of the invention
For the problems referred to above, the object of the present invention is to provide a kind of liquid cathode grow discharge optical emission spectrometry to detect the device of metallic ion, with convenient, in real time, carry out quickly the detection of metallic ion.
At this, the invention provides a kind of liquid cathode grow discharge optical emission spectrometry and detect the metallic ion device, comprising: the light source that produces glow discharge occur part, to described light source beam splitting system that grow discharge optical emission spectrometry that part produces carries out light-splitting processing occurs, pick-up unit that the emission spectrum after light-splitting processing is detected and to carry out the data handling system of analyzing and processing through the signal of described pick-up unit; Wherein, described light source generating unit is divided and is comprised: the metal anode that is connected with the positive pole of high-voltage power supply; The liquid cell of the electrolytic solution that is connected with the negative pole of described high-voltage power supply is housed; And sample injection unit, described sample injection unit comprises that the described liquid cell of vertical perforation and top are positioned at the sample feeding pipe under described metal anode; Described sample injection unit makes solution to be measured overflow from the top of described sample feeding pipe, consists of glow discharge between the solution to be measured that overflows from described sample feeding pipe top and described metal anode regional.
Preferably, described sample injection unit can also comprise solution to be measured is introduced into the sampling pump of described sample feeding pipe to overflow from its top.
In the present invention, the distance between the lower end of the top of described sample feeding pipe and described metal anode can be 2～4mm.
Again, preferably, described device can also comprise the discharge opeing unit, and described discharge opeing unit is used for when the liquid level of described liquid cell liquid arrives the regulation liquid level maintaining the regulation liquid level from described liquid cell discharge liquid with the liquid level of liquid with described liquid cell.
And described discharge opeing unit can comprise discharging tube and positive displacement pump, and described discharging tube is vertically inserted logical described liquid cell bottom and its top is positioned at described regulation liquid level, and described positive displacement pump will be discharged from liquid cell over the liquid of regulation liquid level by described discharging tube.
Described sampling pump and described positive displacement pump preferably adopt shared peristaltic pump.Can reduce number of components like this, reduce costs.
In addition, part occurs and can also comprise be used to the three-dimensional platform that described liquid cell and described metal anode are installed in described light source, and described three-dimensional platform is configured to can be in the position of X, Y, the described liquid cell of Z direction fine adjustment and described metal anode.Like this can the fine adjustment liquid cell and the metal anode position of going up in any direction.
In the present invention, described high-voltage power supply can be to provide the DC voltage of 0～2000V, the BHK2000-0.1MG high-voltage power supply that rated current is 0.1A.
Again, in the present invention, described metal anode can be connected with the positive pole of described high-voltage power supply by resistance.Described electrolytic solution can be connected with the negative pole of described high-voltage power supply by graphite electrode.
Wherein, the resistance value of described resistance can be 1～1.2K Ω.
Again, described metal anode can be that diameter is 2～4mm, and the tip forms tungsten electrode or the titanium electrode that diameter is the circle of 1mm.
Again, described sample feeding pipe can be that internal diameter is 0.38mm, and external diameter is the glass capillary of 1.1mm.
Again, the described electrolytic solution in described liquid cell can be that pH is 1 mineral acid.Described mineral acid can be one or more in nitric acid, hydrochloric acid and sulfuric acid.Therefore, described liquid cell is preferably by acidproof insulating material and makes.
In the present invention, described beam splitting system comprises: be used for collecting from the adjustable collector lens of emission spectrum and position in described glow discharge zone; And be used for carry out the spectrometer of light-splitting processing through the emission spectrum of described collector lens, the entrance slit of the center in described glow discharge zone, the center of described collector lens and described spectrometer is centered close on same straight line, and the emission spectrum that is produced to guarantee to discharge enters into the monochromator entrance slit with the light loss of minimum.
Compare with the large-scale spectral instrument of existing commercialization, the advantage of device of the present invention is: apparatus structure of the present invention is simple, and volume is little, easy for installation, low in energy consumption, cost is low, highly sensitive, the sample size that consumes is few, can realize high-throughout online and open-air the detection.
Description of drawings
Fig. 1 is the technology path schematic flow sheet that liquid cathode grow discharge optical emission spectrometry of the present invention detects the metallic ion device;
Fig. 2 is the three-dimensional platform structure three-view diagram in the device of one embodiment of the present of invention, and wherein Fig. 2 (a) is front view, and Fig. 2 (b) is vertical view, and Fig. 2 (c) is left view;
Fig. 3 is the overlooking and cross-sectional schematic of liquid cell in the device of one embodiment of the present of invention, and wherein Fig. 3 (a) is vertical view, and Fig. 3 (b) is the A-A cut-open view in Fig. 3 (a);
Fig. 4 is the schematic diagram that the liquid cathode grow discharge optical emission spectrometry of one embodiment of the present of invention detects the metallic ion device, wherein 1-resistance; 2-tungsten electrode; 3-graphite electrode; 4-sample feeding pipe; 5-region of discharge; 6-discharging tube; 7-peristaltic pump; 8-sample injection bottle; 9-waste liquid bottle; 10-collector lens; 11-monochromator entrance slit; 12-monochromator splitting system; 13-monochromator exit slit.
Embodiment
Further illustrate the present invention below in conjunction with following embodiment, should be understood that following embodiment only is used for explanation the present invention, and unrestricted the present invention.
Referring to Fig. 1, its schematically illustrated liquid cathode grow discharge optical emission spectrometry of the present invention detects the technology path flow process of metallic ion device.As described in Figure 1, device of the present invention can comprise light source generation part, beam splitting system, pick-up unit, four parts of data handling system.The testing liquid sample can enter described light source generation part by peristaltic pump, produce emission spectrum, this emission spectrum carries out through beam splitting system successively that light-splitting processing, detection system are amplified processing, data handling system is carried out analyzing and processing, obtain the spectral intensity of each element, thus quantitative test metal element content wherein.
Particularly, referring to Fig. 4, its liquid cathode grow discharge optical emission spectrometry that one embodiment of the present of invention are shown detects the schematic diagram of metallic ion device.As shown in Figure 4, described light source generating unit is divided and is comprised high-voltage power supply (not shown), metal anode 2, liquid cell 14 and sample injection unit, and 14 li of liquid cells are equipped with electrolytic solution.High-voltage power supply, metal anode 2, electrolytic solution consist of the loop.Metal anode 2 can be connected to from out wire of high-voltage power cathode, the negative pole of high-voltage power supply by resistance 1 and can be electrically connected to electrolytic solution by the graphite electrode 3 the electrolytic solution that is inserted in liquid cell 14.In one example, sample injection unit by the sample injection bottle 8 that stores solution to be measured, solution to be measured is pumped into sample feeding pipe 4 with certain speed and the sampling pump that testing sample overflows from the sample feeding pipe upper end is consisted of.Liquid cell 14, peristaltic pump 7, discharging tube 6, three-dimensional platform (referring to Fig. 2) etc.Liquid cell 14 and metal anode 2 all can be arranged on X, Y, three-dimensional platform that the Z direction is adjustable referring to Fig. 2) on, can accurately regulate the position that liquid cell 14 and metal anode 2 are gone up in any direction by three-dimensional platform like this.In one example, the sample feeding pipe 4 described liquid cells of vertical perforation and its top are positioned under described metal anode, and the distance between the top of sample feeding pipe and the lower end of metal anode is 2～4mm.Under normal pressure, by applying high pressure to metal anode and electrolytic solution negative electrode, produces thereby cause interelectrode gas that discharge occurs, namely, between the solution to be measured that overflows from the sample feeding pipe top and metal anode formation glow discharge regional.
In testing process, constantly there is testing liquid to overflow from the sample feeding pipe top and enters electrolytic solution, in order to stablize liquid level of electrolyte, the discharge opeing unit can be set, be used for when the liquid level of described liquid cell liquid arrives the regulation liquid level discharging liquid from described liquid cell and maintain the regulation liquid level with the liquid level of liquid with described liquid cell, for example arrange and vertically insert bottom logical liquid cell and its top is positioned at the discharging tube 6 of described regulation liquid level.Like this, when liquid level in liquid cell rises over the regulation liquid level, surpass the liquid of regulation liquid level by discharging tube 6 discharges.Discharging tube 6 can utilize the self gravitation of liquid to discharge, and positive displacement pump also can be set liquid is discharged from discharging tube 6.The waste liquid of discharging from discharging tube 6 can be from be stored in waste liquid 9.The discharge opeing cell formation that consists of is like this kept the liquid buffer of liquid level stabilizing in liquid cell 14.Should be understood that in this example embodiment, although be provided with discharging tube 6, also discharging tube 6 can be set but directly open a draining hole in the side-walls of the regulation liquid level of liquid cell.
In a preferred example, the positive displacement pump of the sampling pump of sample feeding pipe 4 and discharging tube 6 can share a peristaltic pump 7, and namely, sample feeding pipe 4 and discharging tube 6 all be connected to peristaltic pump 7, peristaltic pump 7 is also used as sampling pump and positive displacement pump.
Solution to be measured can be stored in sample injection bottle 8, is introduced by peristaltic pump 7 through sample feeding pipe 4, consists of glow discharge zone 5 between the solution to be measured that overflows and metal anode 2, and with liquid cell 14 in electrolytic solution and the whole loop of peripheral circuit formation glow unit.When high-voltage power supply applies voltage, in discharge process, solution in liquid electrode constantly is vaporized, thereby make the metallic ion that is dissolved in solution also enter into plasma and be excited, 5 produce emission spectrum in glow discharge zone, thereby the emission spectrum that discharge produces is relevant with solute composition in the solution electrode.
Again, referring to Fig. 4, the emission spectrum that glow discharge zone 5 produces adopts the collector lens 10 that is fixed on support to collect, and enters monochromator splitting system 12 through monochromator entrance slit 11, through after light-splitting processing, arrive photomultiplier by monochromator exit slit 13.Signal is amplified by photomultiplier, finally by the data handling system analyzing and processing, obtains the spectral intensity of each element, thus quantitative test metal element content wherein.
Preferably, center, the center of collector lens 10 and being centered close on same straight line of monochromator entrance slit 13 in glow discharge zone 5 enter into the monochromator entrance slit to guarantee emission spectrum that discharge produced with the light loss of minimum.
In an example embodiment, the diameter of metal anode 2 is 2～4mm, and its tip is circular, and diameter is 1mm, and material can be tungsten or titanium.
In another example embodiment, the electrolytic solution in liquid cell 14 adopts the mineral acid of pH=1.Mineral acid can be a kind of in nitric acid, hydrochloric acid or sulfuric acid.Liquid cell 14 can be made by acidproof insulating material (for example teflon).
In another example embodiment, high-voltage power supply is to provide 0～2000V high pressure, and rated current is the BHK2000-0.1MG high-voltage power supply of 0.1A.
In another example embodiment, sample feeding pipe 4 is that internal diameter is 0.38mm, and external diameter is the glass capillary of 1.1mm.
In another example embodiment, the resistance value of resistance 2 is 1～1.2K Ω.
Again, referring to Fig. 2, it illustrates the three-dimensional platform structure three-view diagram in the device of one embodiment of the present of invention, and wherein Fig. 2 (a) is front view, and Fig. 2 (b) is vertical view, and Fig. 2 (c) is left view.Corresponding size is as shown in mark in figure.Three-dimensional platform can be realized accurately controlling on X, Y, Z direction, comprises coarse adjustment and fine setting (precision reaches 1mm) part.
Again, referring to Fig. 3, it illustrates overlooking and cross-sectional schematic of liquid cell in the device of one embodiment of the present of invention, and wherein Fig. 3 (a) is vertical view, and Fig. 3 (b) is the A-A cut-open view in Fig. 3 (a).Corresponding size is as shown in mark in figure.In this embodiment, aperture and the macropore that diameter is 4.3mm that to open respectively a diameter in the bottom center of liquid cell with apart from central 15mm place be 1.2mm are respectively for sample feeding pipe and discharging tube insertion.
The below further exemplifies embodiment to describe the present invention in detail.Should understand equally; following examples only are used for the present invention is further illustrated; can not be interpreted as limiting the scope of the invention, some nonessential improvement that those skilled in the art's foregoing according to the present invention is made and adjustment all belong to protection scope of the present invention.The parameter that following example is concrete is only also an example in OK range, namely, those skilled in the art can do in suitable scope by the explanation of this paper and select, and not really want to be defined in the hereinafter concrete numerical value of example.
At first designed light source three-dimensional platform (Fig. 2), liquid cell (Fig. 3) partly occurs, corresponding size is as shown in mark in figure; Fig. 2 is the three-view diagram of three-dimensional platform, and designed three-dimensional platform can be realized accurately controlling on X, Y, Z direction, comprises coarse adjustment and fine setting (precision reaches 1mm) part.Fig. 3 is that liquid cell is overlooked and cross-sectional schematic, and designed liquid cell is to be made through certain processes by polytetrafluoroethylmaterial material, and its container inner wall radius is 46mm, and volume is about 60ml.Especially, open respectively an aperture and a macropore in liquid cell central authorities with apart from central 15mm place, diameter is respectively 1.2mm and 4.3mm.Fig. 4 is that the liquid cathode grow discharge optical emission spectrometry detects metallic ion device integrated connection schematic diagram.As shown in the figure, power acquisition provides 0～2000V high direct voltage with the BHK2000-0.1MG high-voltage power supply, and rated current is 0.1A.High-voltage power supply positive pole wire out is connected with tungsten electrode 2 through resistance 1; Negative pole is connected with graphite electrode 3.Sample solution is introduced by peristaltic pump 7 through sample feeding pipe 4 from sample injection bottle 8, and the sample solution that overflows and the electrolyte solution in liquid cell and peripheral circuit consist of the whole loop of glow unit.Metal anode and liquid cell are fixed on designed three-dimensional platform, liquid cell under metal anode, the most advanced and sophisticated 2～4mm distance that keeps of the top of its sample feeding pipe and metal anode; Electrolyte solution wherein can be a kind of in nitric acid, hydrochloric acid, sulfuric acid, and pH need transfer to 1.
Under normal pressure, take solution as negative electrode, tungsten electrode is anode, by applying high pressure to two electrodes, produces thereby cause interelectrode gas that discharge occurs; Zone 5 between the solution to be measured that glow discharge is namely overflowed at metal anode and glass capillary tip produces.Unnecessary waste liquid is stored in liquid cell, is drained in waste liquid bottle 9 by peristaltic pump 7 through discharging tube 6 when it arrives certain altitude.Solution to be measured is introduced and is made by oneself a liquid buffer by peristaltic pump, guarantee the liquid cell liquid level stabilizing.
The emission spectrum that region of discharge 5 produces adopts the collector lens 10 that is fixed on support to collect, and enters monochromator splitting system 12 through entrance slit 11, then arrives photomultipliers by exit slit 13.Signal is amplified by photomultiplier, finally by the data handling system analyzing and processing, obtains the spectral intensity of each element, thus quantitative test constituent content wherein.
Industrial applicability: apparatus structure of the present invention is simple, and volume is little, and is easy for installation, low in energy consumption, and cost is low, highly sensitive, and the sample size that consumes is few, can realize high-throughout online and open-air the detection.
Claims (15)
1. a liquid cathode grow discharge optical emission spectrometry detects the device of metallic ion, it is characterized in that, comprising: the light source that produces glow discharge occur part, to described light source beam splitting system that grow discharge optical emission spectrometry that part produces carries out light-splitting processing occurs, pick-up unit that the emission spectrum after light-splitting processing is detected and to carry out the data handling system of analyzing and processing through the signal of described pick-up unit; Wherein, described light source generating unit is divided and is comprised: the metal anode that is connected with the positive pole of high-voltage power supply; The liquid cell of the electrolytic solution that is connected with the negative pole of described high-voltage power supply is housed; And sample injection unit, described sample injection unit comprises that the described liquid cell of vertical perforation and top are positioned at the sample feeding pipe under described metal anode; Described sample injection unit makes solution to be measured overflow from the top of described sample feeding pipe, consists of glow discharge between the solution to be measured that overflows from described sample feeding pipe top and described metal anode regional.
2. liquid cathode grow discharge optical emission spectrometry according to claim 1 detects the device of metallic ion, it is characterized in that, described sample injection unit also comprises solution to be measured is introduced into the sampling pump of described sample feeding pipe to overflow from its top.
3. liquid cathode grow discharge optical emission spectrometry according to claim 1 and 2 detects the device of metallic ion, it is characterized in that, the distance between the top of described sample feeding pipe and the lower end of described metal anode is 2～4mm.
4. according to claim 1 to 3, the described liquid cathode grow discharge optical emission spectrometry of any one detects the device of metallic ion, it is characterized in that, also comprise the discharge opeing unit, described discharge opeing unit is used for when the liquid level of described liquid cell liquid arrives the regulation liquid level maintaining the regulation liquid level from described liquid cell discharge liquid with the liquid level of liquid with described liquid cell.
5. liquid cathode grow discharge optical emission spectrometry according to claim 4 detects the device of metallic ion, it is characterized in that, described discharge opeing unit comprises discharging tube and positive displacement pump, described discharging tube is vertically inserted logical described liquid cell bottom and its top is positioned at described regulation liquid level, and described positive displacement pump will be discharged from liquid cell over the liquid of regulation liquid level by described discharging tube.
6. liquid cathode grow discharge optical emission spectrometry according to claim 5 detects the device of metallic ion, it is characterized in that described sampling pump and the described positive displacement pump peristaltic pump for sharing.
7. according to claim 1 to 5, the described liquid cathode grow discharge optical emission spectrometry of any one detects the device of metallic ion, it is characterized in that, part occurs and also comprises be used to the three-dimensional platform that described liquid cell and described metal anode are installed in described light source, and described three-dimensional platform is configured to can be in the position of X, Y, the described liquid cell of Z direction fine adjustment and described metal anode.
8. according to claim 1 to 7, the described liquid cathode grow discharge optical emission spectrometry of any one detects the device of metallic ion, it is characterized in that, described metal anode is connected with the positive pole of described high-voltage power supply by resistance, and described electrolytic solution is connected with the negative pole of described high-voltage power supply by graphite electrode.
9. liquid cathode grow discharge optical emission spectrometry according to claim 8 detects the device of metallic ion, it is characterized in that, the resistance value of described resistance is 1～1.2K Ω.
10. according to claim 1 to 9, the described liquid cathode grow discharge optical emission spectrometry of any one detects the device of metallic ion, it is characterized in that, described beam splitting system comprises: be used for collecting from the adjustable collector lens of emission spectrum and position in described glow discharge zone; And be used for carrying out the spectrometer of light-splitting processing through the emission spectrum of described collector lens, center, the center of described collector lens and the entrance slit of described spectrometer in described glow discharge zone are centered close on same straight line.
11. according to claim 1 to 10, the described liquid cathode grow discharge optical emission spectrometry of any one detects the device of metallic ion, it is characterized in that, described high-voltage power supply is to provide 0～2000V high pressure, and rated current is the power supply of 0.1A.
12. according to claim 1 to 11, the described liquid cathode grow discharge optical emission spectrometry of any one detects the device of metallic ion, it is characterized in that, described metal anode is that diameter is 2～4mm, and the tip forms tungsten electrode or the titanium electrode that diameter is the circle of 1mm.
13. according to claim 1 to 12, the described liquid cathode grow discharge optical emission spectrometry of any one detects the device of metallic ion, it is characterized in that, described sample feeding pipe is that internal diameter is 0.38mm, and external diameter is the glass capillary of 1.1mm.
14. according to claim 1 to 13, the described liquid cathode grow discharge optical emission spectrometry of any one detects the device of metallic ion, it is characterized in that, the described electrolytic solution in described liquid cell is that pH is 1 mineral acid.
15. according to claim 1 to 14, the described liquid cathode grow discharge optical emission spectrometry of any one detects the device of metallic ion, it is characterized in that, described liquid cell is made by acidproof insulating material.
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