CN102944632A - Sample preparation device for elution of PCBs (polychlorinated biphenyls) in environmental water analysis - Google Patents
Sample preparation device for elution of PCBs (polychlorinated biphenyls) in environmental water analysis Download PDFInfo
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- CN102944632A CN102944632A CN2012104388924A CN201210438892A CN102944632A CN 102944632 A CN102944632 A CN 102944632A CN 2012104388924 A CN2012104388924 A CN 2012104388924A CN 201210438892 A CN201210438892 A CN 201210438892A CN 102944632 A CN102944632 A CN 102944632A
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Abstract
The invention relates to a sample preparation device for elution of PCBs (polychlorinated biphenyls) in environmental water analysis, belonging to the field of analytical testing. The prior art of GC-MS (gas chromatography-mass spectrometer) analysis of elution of a target substance in a sample preparation procedure based on trace polychlorinated biphenyls in a water body is not satisfactory, and the sample preparation device is provided to solve the problem. According to the scheme, based on a structure of an elution device with a conventional syringe and a syringe filter, a protective shell with an ultrasonic transducer is dragged simultaneously from two sides through two adhesive tapes which are bonded in a butting way and are arranged to surround the syringe, so that the protective shell is positioned near the bottom of the syringe. When the device is used, elution is reinforced by the following mechanism: high-frequency ultrasonic waves are applied prior to connection of the syringe filter with a negative pressure source to strongly promote desorption and mass transfer of the target substance, irradiation of the high-frequency ultrasonic waves is still continuously maintained when the syringe filter is connected with the negative pressure source for suction filtration so as to strongly inhibit re-adsorption of the target substance in the suction filtration process. The device can be removed and installed conveniently.
Description
Technical field
The present invention relates to a kind of standby sample device for PCBs wash-out link that Environmental Water is analyzed that is applied to, belong to the analytical test field.
Background technology
The PCBs character group refers to polychlorinated biphenyl, and the focus that this case is paid close attention to is that environment water Trace Polychlorinated Biphenyls gas-matter coupling detects the object wash-out link in its standby sample program.
About the origin of Trace Polychlorinated Biphenyls in the environment water and the general background of analyzing and testing thereof, can be referring to Chinese invention patent application case 201210099400.3.
In many detection methods of Trace Polychlorinated Biphenyls, comparatively speaking, comparatively accurate, reliable with the GC-MS method in for environment water.Described GC-MS analyzes, and refers to gas chromatography-mass spectrometry, the GC-MS character group its refer to and art-recognized meanings itself for the professional in analysis and testing technology field, be known.
As mentioned above, in environment water Trace Polychlorinated Biphenyls analyzing and testing, the GC-MS method is than the tool advantage, and this point is described in detail in above-mentioned Chinese invention patent application case 201210099400.3.
According to the detailed introduction of Chinese invention patent application case 201210099400.3, among the GC-MS analytical test program for Trace Polychlorinated Biphenyls in the water body, comprise important standby sample step, the namely step of adsorptive separation target substance from water body; Employing is adsorbed target substance through the good magnetic composite nano adsorbent of the hydrophilicity of modification from water body, and through magnetic separation, wash-out, evaporate, dry up, the step such as organic solvent constant volume, finish standby sample, be a more high efficiency sampling method.
Elution step wherein is the focus that this case is paid close attention to.
Analyze in the standby sample for water body Trace Polychlorinated Biphenyls GC-MS existing, its elution step, to be placed within the syringe through the magnetic composite nano adsorbent that from water body, has adsorbed target substance that magnetic separates, and the syringe filtrator in micron order aperture is installed at the syringe front end, with the described magnetic composite nano adsorbent of organic solvent drip washing, and in conjunction with the suction filtration means, reach the purpose of wash-out target substance.
In elution step, such as how the least possible wash-out organic solvent, reach one desirable as far as possible near 100% eluting rate, for saving analysis time, and, the reliability, the accuracy that improve analysis result are all significant, and about this point, any one professional who is engaged in the GC-MS analysis is clear.
In the prior art, comprise that GC-MS analyzes the standby sample program of multiple instrumental analysis of standby sample program, the absorb-elute step of its target substance, usually, all be to adopt simple, traditional syringe to add the apparatus structure of filtrator, and realize wash-out in the mode that the simple drip washing of organic solvent adds suction filtration; Because there is special affinity interaction power in the evaluating objects material usually and between the selected adsorbent, this is the basis that selected adsorbent has good trapping ability, yet, also just because the special affinity interaction power that exists between selected adsorbent and the evaluating objects material is difficult to reach a desirable eluting rate so that the simple drip washing of common organic solvents adds the mode of suction filtration; In other words, selected adsorbent its early stage is to the trapping ability of target substance, with the wash-out difficulty of evaluating objects material in the later stage elution step be the desorb difficulty, both are contradiction each other; Generally speaking, be to improve the eluting rate of evaluating objects material, must take sacrifice adsorbent early stage to the trapping ability of evaluating objects material as prerequisite, vice versa; More particularly, the Capture by Sorbents During ability is weak, comparatively speaking, and just easy wash-out, otherwise, if the Capture by Sorbents During ability is strong, just be not easy to reach desirable eluting rate.
As mentioned above, there is special affinity interaction power in the evaluating objects material usually and between the selected adsorbent, as the specialty chemical worker, this be extremely hold intelligible, as an example, can and evaluating objects material polychlorinated biphenyl between form special π-π combination power, and has again special high-ratio surface, and carry out easily that magnetic separates, certainly the magnetic Nano activated charcoal that first-selected is through hydrophilic modifying, this is the first-selected adsorbent that can reach optimum capture rate, but, just because of the magnetic Nano activated charcoal to polychlorinated biphenyl π-π combination power is strong, specific surface is large especially, it is not strong to capture Z-TEK, so, the problem that causes is exactly that its eluting rate lowers greatly, usual wash-out means become fully unreliable at this, to such an extent as to can't consider to use among the actual analysis Test Application described magnetic Nano activated charcoal to be used as trapping agent or to say adsorbent fully.Just because of this, adopt described magnetic Nano activated charcoal through hydrophilic modifying to be used as the standby sample trapping agent of GC-MS and so on instrumental analysis or say adsorbent, in the prior art basic nobody mention, more report without pertinent literature.
Above-mentioned Chinese invention patent application case 201210099400.3, obviously be that the carbon nano-tube of magnetic coupling captures the polychlorinated biphenyl in the water body not as the trapping agent through the magnetic active carbon of hydrophilic modifying with a kind of trapping ability, the scheme of this application case is real to be a kind of power of capture and eluting rate two-phase balance unavoidable newly measures afterwards.
As seen, if rest on the existing elution technique level always, so, the situation that adsorbent selection face receives greatly to limit to will continue.
In brief, in the so specific field of water body Trace Polychlorinated Biphenyls analytical test work, the wash-out means in the existing standby sample program usually can not be satisfactory; Therefore, how improving the object elution technique in the standby sample program of water body Trace Polychlorinated Biphenyls analytical test, is a problem that merits attention.
Summary of the invention
Technical matters to be solved by this invention is, detects the unsafty present situation of object elution technique in its standby sample program for environment water Trace Polychlorinated Biphenyls gas-matter coupling, researches and develops a kind of new washing device of addressing this problem of helping.
The present invention is by the described technical matters of following solution; this scheme provides a kind of standby sample device for PCBs wash-out link that Environmental Water is analyzed that is applied to; this PCBs character group refers to polychlorinated biphenyl; this application of installation detects it for the wash-out link in sample program in environment water pollution by polychlorinated biphenyles thing gas-matter coupling; the structure of this device comprises syringe; and; syringe filter; a port of this syringe filter and the injection port of this syringe are socketed mutually; emphasis is; the structure of this device also comprises ultrasonic transducer; and; the ultrasonic transducer containment vessel; this ultrasonic transducer containment vessel is a box or drum; described ultrasonic transducer is the inside that is installed in this ultrasonic transducer containment vessel; the both sides of this ultrasonic transducer containment vessel respectively are equiped with a ring; the installing mode of this ring on the ultrasonic transducer containment vessel is fixedly installing mode or hinged installing mode; and; article two, magic tape; two rings are connected with two magic tapes respectively; article two, the remainder of magic tape like as two arms around filling the span of a man's arms on the outer wall surface of syringe; article two, magic tape and mutually sticking taking; described magic tape has another name called the glochild pull stap; mutually sticking two magic tapes taking its pull strength and cause this ultrasonic transducer containment vessel to be close on the outer wall surface of syringe; this is close to the bottom of the contiguous syringe of its locations of structures of ultrasonic transducer containment vessel on the syringe outer wall surface; one of function of these two magic tapes is that the ultrasonic transducer containment vessel is positioned on the syringe outer wall surface together with its content constraint; two of the function of these two magic tapes is to give this apparatus structure dismounting mobility convenient to both; its radiable ultrasonic frequency scope of this ultrasonic transducer is between 100KHz and 12MHz; and; higher-order of oscillation electric signal transmission cable, an end of this higher-order of oscillation electric signal transmission cable see through described ultrasonic transducer containment vessel and are connected with described ultrasonic transducer.The described ultrasonic transducer containment vessel that sees through refers to the shell wall that penetrates by the ultrasonic transducer containment vessel.
Described magic tape one word, the art-recognized meanings of itself is known for magic tape manufacturing industry technician.Described its article that refer to of magic tape one word are clear and definite, do not have ambiguity.
Described its art-recognized meanings of ultrasonic transducer one word is known for the ultrasound wave professional and technical personnel; Be suitable for the ultrasonic transducer of this case yes hypomegetic ultrasonic transducer, the hypomegetic ultrasonic transducer of various forms all has commercially available, also can customize to ultrasound wave specialized factory.
Described ultrasonic transducer containment vessel is for the protection of ultrasonic transducer, makes it avoid exposing in hostile environment; This its material of ultrasonic transducer containment vessel can be any selected material, and its material of described containment vessel is metal, pottery, glass, plastics for example, etc., its material can be selected as required.
Described its art-recognized meanings of higher-order of oscillation electric signal transmission cable one word is known for the ultrasound wave professional and technical personnel; Higher-order of oscillation electric signal transmission cable market is on sale, also can customize to ultrasound wave specialized factory.
The ultrasound wave of described frequency range between 100KHz and 12MHz is the ultrasound wave of the weak high-frequency band of ultrasonic cavitation effect, has many different from the ultrasound wave of the strong low-frequency band of ultrasonic cavitation effect; Its difference is known for the professional and technical personnel of art of ultrasound, is not repeated herein.
The structure of this device of this case can comprise higher-order of oscillation electric signal generator certainly, and the other end of described higher-order of oscillation electric signal transmission cable can be connected with this higher-order of oscillation electric signal generator.Various higher-order of oscillation electric signal generator all has commercially available; Also can customize to ultrasound wave specialized factory.
Its radiable ultrasonic frequency of this ultrasonic transducer, further preferred scope is between 300KHz and 12MHz.
This syringe filter, the aperture of the filter bores of its filter membrane can be the arbitrarily selected apertures between from 0.01 micron to several microns, and still, the preferable range in its filter membrane aperture of this syringe filter is between 0.05 micron and 1.00 microns.Described syringe filter with and interior filter membrane market on sale, also can customize to specialized factory.
Described syringe, its pattern is analogous to usual medical syringe; Its material of described syringe can be plastics, glass, metal, pottery, etc.; Its preferred material of this syringe is quartz glass material or stainless steel.
Preferred magic tape is the elastic force magic tape, and this elastic force magic tape also claims stretch sticking cingulum, and this elastic force magic tape is to have flexible magic tape.So-called elastic force magic tape or stretch sticking cingulum, its art-recognized meanings itself is known for magic tape manufacturing industry technician.
The structure of this device of this case can also comprise some annexes, described annex for example: the fixed mount that is used for fixing described syringe; Described annex is again for example: the filtrate receiver that is used for receiving filtrate that is connected with syringe filter; Described annex is also for example: with the negative pressure source equipment of described filtrate receiver and syringe filter UNICOM, this negative pressure source refers to any equipment that can make vacuum condition, and described negative pressure source specifically refers to the equipment of vacuum pump and so on; Known with regard to itself art-recognized meanings of vacuum pump one word in the vacuum technique field only; Etc..
Advantage of the present invention is, detecting its standby sample program in usual PCBs gas-matter coupling is that syringe adds on the architecture basics of syringe filter with washing device, further at the ultrasonic transducer of syringe outer wall surface installation with containment vessel, its ears of this containment vessel are connected with two magic tapes respectively, this containment vessel is to rely on two pulling of magic tape and be positioned on the syringe outer wall surface, the contiguous syringe of the locations of structures of its location bottom, so, when application this case device carries out the wash-out operation, can first the adsorbent that has captured object be moved in the syringe, and in the syringe filling of adsorbent region or spray wash-out organic solvent, simultaneously, open higher-order of oscillation electric signal generator, change via the form of energy of described ultrasonic transducer, and see through the sound wave transmission of described containment vessel and needle cylinder wall, the adsorbent region sustained radiation ultrasonic cavitation effect ultrasound wave of weak high-frequency band in the syringe, and during this period, connect off and on negative pressure source, off and on suction filtration; Among its application of this case device, it is the reinforcement of reaching the wash-out link by following mechanism: the ultrasound wave that before connecting negative pressure source, applies high-frequency band, brute force is facilitated desorb, the mass transfer of object, and during connection negative pressure source suction filtration, the ultrasound wave of high-frequency band still continues acting on simultaneously, and brute force checks the again absorption of object in the suction filtration process; Can so repeat to operate several times according to the needs of actual conditions, to reach desirable wash-out target.
And the structure of this device is a structure that is easy to disassemble, and makes things convenient for independent assortment to use.
The application of this case device can be so that be similar to the trapping agent that its such inside of magnetic active carbon has the huge brute force of the specific surface in large and small duct of flood tide, and its target substance that captures no longer is difficult to wash-out; Based on the application of this case device, magnetic active carbon cheap and easy to get application in the standby sample program of instrumental analysis just becomes a kind of actual option that allows.
Description of drawings
Fig. 1 is the brief synoptic diagram of this case apparatus structure.
Among the figure; the 1st, syringe; the 2nd, ultrasonic transducer; 3,8 is respectively the different magic tape in two-strip structure position, and 4,7 is respectively two rings that locations of structures is different, the 5th, and syringe filter; the 6th, higher-order of oscillation electric signal transmission cable; the 9th, the ultrasonic transducer containment vessel, two arrows among the figure show the direction of action of filling the span of a man's arms of two magic tapes, do not draw described other annex among the figure.
Embodiment
In this case embodiment that Fig. 1 shows; the structure of this device comprises syringe 1; and; syringe filter 5; port of this syringe filter 5 and the injection port of this syringe 1 are socketed mutually; emphasis is; the structure of this device also comprises ultrasonic transducer 2; and; ultrasonic transducer containment vessel 9; this ultrasonic transducer containment vessel 9 is a box or drum; described ultrasonic transducer 2 is the inside that is installed in this ultrasonic transducer containment vessel 9; the both sides of this ultrasonic transducer containment vessel 9 respectively are equiped with a ring; this ring 4; 7 installing modes on ultrasonic transducer containment vessel 9 are fixedly installing mode or hinged installing mode; what show in the legend is fixedly installing mode; described hinged installing mode is not showed with legend; connected mode its art-recognized meanings for the personnel of mechanical major that a described hinged word refers to is known; need not superfluous words explains; and; article two, magic tape; these two magic tapes are respectively magic tape 3 and magic tape 8; ring 4 is connected with ring and is connected with magic tape 3 and magic tape 8 respectively; the remainder of magic tape 3 and magic tape 8 like as two arms around filling the span of a man's arms on the outer wall surface of syringe 1; between magic tape 3 and the magic tape 8 and mutual sticking taking; described magic tape has another name called the glochild pull stap; mutually the sticking magic tape of taking 3 and magic tape 8 its pull strength and cause this ultrasonic transducer containment vessel 9 to be close on the outer wall surface of syringe 1; this is close to the bottom of the contiguous syringe 1 of ultrasonic transducer containment vessel 9 its locations of structures on syringe 1 outer wall surface; one of function of magic tape 3 and magic tape 8 is that ultrasonic transducer containment vessel 9 is positioned on syringe 1 outer wall surface together with its content constraint; two of the function of magic tape 3 and magic tape 8 is to give this apparatus structure dismounting mobility convenient to both; these ultrasonic transducer 2 its radiable ultrasonic frequency scopes are between 100KHz and 12MHz; and; higher-order of oscillation electric signal transmission cable 6, an end of this higher-order of oscillation electric signal transmission cable 6 see through ultrasonic transducer containment vessel 9 and are connected with described ultrasonic transducer 2.The described ultrasonic transducer containment vessel 9 that sees through refers to the shell wall that penetrates by ultrasonic transducer containment vessel 9.
The frequency values arbitrarily selected of this scope between 100KHz and 12MHz all is the preferred frequency enforcement value that this case allows.
The structure of this embodiment can comprise higher-order of oscillation electric signal generator certainly, and the other end of described higher-order of oscillation electric signal transmission cable 6 can be connected with this higher-order of oscillation electric signal generator.Do not draw described higher-order of oscillation electric signal generator in the accompanying drawing.
Among implementing, these ultrasonic transducer 2 its radiable ultrasonic frequencies, further preferred practical range is between 300KHz and 12MHz; The ultrasonic frequency value of selecting arbitrarily between this 300KHz and 12MHz all is the described further preferred frequency values that this case allows enforcement.
Among implementing, this syringe filter 5, the aperture of the filter bores of its filter membrane can be the arbitrarily selected aperture between from 0.01 micron to several microns, and still, the preferred practical range in its filter membrane aperture of this syringe filter is between 0.05 micron and 1.00 microns; The filter membrane aperture value arbitrarily selected of scope between 0.05 micron and 1.00 microns all is the enforcement value in the described aperture of this case permission.Described syringe filter 5 with and interior filter membrane market all on sale, also can customize to relevant speciality producer.
Described syringe 1, its pattern is analogous to usual medical syringe; Described syringe 1 its enforcement material can be plastics, glass, metal, pottery, etc.; This syringe 1 its preferably to implement material be quartz glass material or stainless steel.
The structure of this device of this case can also comprise some annexes, described annex for example: the fixed mount that is used for fixing described syringe 1; Described annex is also for example: the filtrate receiver that is used for receiving filtrate that is connected with syringe filter 5; Described annex is more for example: with the negative pressure source equipment of described filtrate receiver and syringe filter 5 UNICOMs, this negative pressure source refers to any equipment that can make vacuum condition, and described negative pressure source specifically refers to the equipment of vacuum pump and so on; Known with regard to itself art-recognized meanings of vacuum pump one word in the vacuum technique field only; Etc..Do not draw described annex in the accompanying drawing.
Implement related syringe 1, its pattern is not limited to the pattern in the accompanying drawing; Described syringe 1 also can be the structure that its upper end open-mouth does not have the convex edge.
Implement related syringe 1, the pattern of its injection port is not limited to the pattern in the accompanying drawing.
Implement related syringe 1, make a general reference its similar function member.
Implement related syringe filter 5, be not limited to accompanying drawing legend structure, related syringe filter 5 general reference similar function members.
The implementation of this case is not limited to this case accompanying drawing legend.
Claims (6)
1. be applied to the standby sample device for PCBs wash-out link that Environmental Water is analyzed; this PCBs character group refers to polychlorinated biphenyl; this application of installation detects it for the wash-out link in sample program in environment water pollution by polychlorinated biphenyles thing gas-matter coupling; the structure of this device comprises syringe; and; syringe filter; a port of this syringe filter and the injection port of this syringe are socketed mutually; it is characterized in that; the structure of this device also comprises ultrasonic transducer; and; the ultrasonic transducer containment vessel; this ultrasonic transducer containment vessel is a box or drum; described ultrasonic transducer is the inside that is installed in this ultrasonic transducer containment vessel; the both sides of this ultrasonic transducer containment vessel respectively are equiped with a ring; the installing mode of this ring on the ultrasonic transducer containment vessel is fixedly installing mode or hinged installing mode; and; article two, magic tape; two rings are connected with two magic tapes respectively; article two, the remainder of magic tape like as two arms around filling the span of a man's arms on the outer wall surface of syringe; article two, magic tape and mutually sticking taking; described magic tape has another name called the glochild pull stap; mutually sticking two magic tapes taking its pull strength and cause this ultrasonic transducer containment vessel to be close on the outer wall surface of syringe; this is close to the bottom of the contiguous syringe of its locations of structures of ultrasonic transducer containment vessel on the syringe outer wall surface; one of function of these two magic tapes is that the ultrasonic transducer containment vessel is positioned on the syringe outer wall surface together with its content constraint; two of the function of these two magic tapes is to give this apparatus structure dismounting mobility convenient to both; its radiable ultrasonic frequency scope of this ultrasonic transducer is between 100KHz and 12MHz; and; higher-order of oscillation electric signal transmission cable, an end of this higher-order of oscillation electric signal transmission cable see through described ultrasonic transducer containment vessel and are connected with described ultrasonic transducer.
2. according to claim 1ly be applied to the standby sample device for PCBs wash-out link that Environmental Water is analyzed, it is characterized in that, the structure of this device comprises higher-order of oscillation electric signal generator, and the other end of described higher-order of oscillation electric signal transmission cable is connected with this higher-order of oscillation electric signal generator.
3. the standby sample device for PCBs wash-out link that is applied to the Environmental Water analysis according to claim 1 is characterized in that its radiable ultrasonic frequency scope of this ultrasonic transducer is between 300KHz and 12MHz.
4. the standby sample device for PCBs wash-out link that is applied to the Environmental Water analysis according to claim 1 is characterized in that the aperture of this its filter membrane of syringe filter is between 0.05 micron and 1.00 microns.
5. the standby sample device for PCBs wash-out link that is applied to the Environmental Water analysis according to claim 1 is characterized in that its material of this syringe is quartz glass material or stainless steel.
6. according to claim 1ly be applied to the standby sample device for PCBs wash-out link that Environmental Water is analyzed, it is characterized in that, described magic tape is the elastic force magic tape, and this elastic force magic tape also claims stretch sticking cingulum, and this elastic force magic tape is to have flexible magic tape.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104388924A CN102944632A (en) | 2012-10-25 | 2012-10-25 | Sample preparation device for elution of PCBs (polychlorinated biphenyls) in environmental water analysis |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012104388924A CN102944632A (en) | 2012-10-25 | 2012-10-25 | Sample preparation device for elution of PCBs (polychlorinated biphenyls) in environmental water analysis |
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| CN101871920A (en) * | 2010-06-13 | 2010-10-27 | 中国环境科学研究院 | Multistage improvement column for quickly pre-processing and purifying polychlorinated biphenyl in biological sample |
| CN102279231A (en) * | 2011-06-28 | 2011-12-14 | 中国科学院生态环境研究中心 | Quick qualitative detection method for polychlorinated biphenyl pollutants |
| CN102507808A (en) * | 2011-11-10 | 2012-06-20 | 宁波大学 | Method for enriching and separating trace amount of polychlorinated biphenyls (PCBs) |
| CN102645426A (en) * | 2012-03-08 | 2012-08-22 | 宁波大学 | Easy-to-assemble electrogenerated chemiluminescence (ECL) glassy carbon electrode containing high-frequency oscillation mechanism |
| CN102650600A (en) * | 2012-03-08 | 2012-08-29 | 宁波大学 | Electric and acoustic dual-excited bundled composite glass carbon electrode |
| CN102680591A (en) * | 2012-03-26 | 2012-09-19 | 宁波大学 | Method for quickly detecting trace polychlorinated biphenyls (PCBs) based on carbon nano tube modification technology |
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2012
- 2012-10-25 CN CN2012104388924A patent/CN102944632A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101105477A (en) * | 2007-07-24 | 2008-01-16 | 南京大学 | Method for detecting atmosphere granule trace polychlorinated biphenyls by ion trap tandem mass spectrometry |
| CN101871920A (en) * | 2010-06-13 | 2010-10-27 | 中国环境科学研究院 | Multistage improvement column for quickly pre-processing and purifying polychlorinated biphenyl in biological sample |
| CN102279231A (en) * | 2011-06-28 | 2011-12-14 | 中国科学院生态环境研究中心 | Quick qualitative detection method for polychlorinated biphenyl pollutants |
| CN102507808A (en) * | 2011-11-10 | 2012-06-20 | 宁波大学 | Method for enriching and separating trace amount of polychlorinated biphenyls (PCBs) |
| CN102645426A (en) * | 2012-03-08 | 2012-08-22 | 宁波大学 | Easy-to-assemble electrogenerated chemiluminescence (ECL) glassy carbon electrode containing high-frequency oscillation mechanism |
| CN102650600A (en) * | 2012-03-08 | 2012-08-29 | 宁波大学 | Electric and acoustic dual-excited bundled composite glass carbon electrode |
| CN102680591A (en) * | 2012-03-26 | 2012-09-19 | 宁波大学 | Method for quickly detecting trace polychlorinated biphenyls (PCBs) based on carbon nano tube modification technology |
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Application publication date: 20130227 |