CN106442026B - Seven-station sampling rotary table type heavy metal enrichment sampling and pretreatment system based on nano functional material - Google Patents
Seven-station sampling rotary table type heavy metal enrichment sampling and pretreatment system based on nano functional material Download PDFInfo
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- CN106442026B CN106442026B CN201610964044.5A CN201610964044A CN106442026B CN 106442026 B CN106442026 B CN 106442026B CN 201610964044 A CN201610964044 A CN 201610964044A CN 106442026 B CN106442026 B CN 106442026B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2226—Sampling from a closed space, e.g. food package, head space
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- 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
- G01N1/44—Sample treatment involving radiation, e.g. heat
Abstract
The invention relates to the technical field of spectrum analysis instruments, in particular to a seven-station sampling turntable type heavy metal enrichment sampling and pretreatment system based on nano functional materials, which comprises a sampling mechanism and a digestion mechanism which are respectively fixed on a bottom plate, wherein the sampling mechanism comprises a cutter, a sampling turntable, a cutter supporting mechanism, a turnover motor, a membrane holder, an upper air tap, a lower air tap and a filter membrane; the digestion mechanism comprises an upper baffle, a middle baffle, a lower baffle, a digestion turntable, a servo motor, a liquid injection pipe, a liquid suction pipe, a gas blowing pipe, a vibration device and a digestion cup; the film support on the sampling turntable corresponds to the clamping groove on the digestion turntable at the lower part; the mouth of the air blowing pipe is positioned above the leftmost film support. The process is automatically carried out in the closed space, so that the external interference is shielded, and the detection accuracy is effectively improved.
Description
Technical Field
The invention relates to the technical field of spectrum analysis instruments, in particular to a seven-station sampling turntable type heavy metal enrichment sampling and pretreatment system based on nano functional materials.
Background
In the technical field of gas sampling instruments, the full-automatic sampler is widely applied to automatic sampling of air samples by virtue of high automation degree and strong stability, and a rapid and convenient sampling device is provided for detecting PM10, PM2.5, heavy metals and other components in gas. The full-automatic sampler technology mainly uses a singlechip to control a motor, a mechanical arm and a peristaltic pump, thereby realizing the function of automatic membrane replacement. The pretreatment device mainly processes the gas sample for subsequent detection.
At present, the most common gas sampling instrument is an automatic membrane replacement sampling instrument, wherein a filter membrane in an air cylinder is jacked up to a specific station by air pressure, then a gas claw is controlled to send the filter membrane to a sampling station, and after the sampling is finished, the gas claw is sent to a storage cylinder by the filter membrane. Although the design is simple in structure, the filter membrane is easy to be polluted in the movement process, so that the subsequent analysis and treatment of the sample are interfered.
In addition, the collected sample needs to be digested, and at present, the method for digesting the heavy metals in the air mainly comprises an acid digestion method, a dry ashing method, a microwave digestion method and the like. The acid digestion method has the advantages of convenient operation, low price and the like, but the digestion time is long. The dry ashing method needs manual operation and is not easy to realize automatic operation. Microwave digestion has the advantages of high digestion speed, but huge volume and difficult integration. Currently, the longest means for heavy metal digestion is manual digestion or digestion using a digestion instrument. Manual digestion has high labor cost, and pollution is easy to introduce in the digestion process. Most of the digestion instruments widely used at present are large in volume and difficult to be matched with other instruments, full-automatic digestion cannot be realized, and manual operation is needed.
Disclosure of Invention
The invention aims to overcome the defects of the technology, and provides a seven-station sampling turntable type heavy metal enrichment sampling and pretreatment system based on nano functional materials, which can prevent samples from being polluted in the process of collection and can automatically digest the samples.
The invention adopts the following technical scheme to realize the aim:
seven-station sampling rotary disc type heavy metal enrichment sampling and pretreatment system based on nano functional materials is characterized in that: the device comprises a sampling mechanism and a digestion mechanism which are respectively fixed on a bottom plate, wherein the sampling mechanism comprises a cutter, a sampling turntable, a cutter supporting mechanism, a turnover motor, a membrane support, an upper air tap, a lower air tap and a filter membrane; the sampling turntable is driven to rotate by a servo motor arranged on the bottom plate, at least two through holes are formed in the periphery of the disk surface of the sampling turntable, the membrane support is arranged in each through hole, the turnover motor is fixed on one side of each through hole, the output end of the turnover motor is connected with the membrane support, and the filter membrane is placed on the membrane support; the cutter supporting mechanism is arranged on one side of the sampling turntable and is used for supporting a cutter and controlling the upper air tap and the lower air tap to move to the position of the filter membrane;
the digestion mechanism comprises an upper baffle, a middle baffle, a lower baffle, a digestion turntable, a servo motor, a liquid injection pipe, a liquid suction pipe, a gas blowing pipe, a vibration device and a digestion cup; the upper baffle plate, the middle baffle plate and the lower baffle plate are fixed on the bottom plate through bolts, a round hole is formed in the middle of the middle baffle plate, a hollow rotating shaft is arranged in the middle of the round hole, the hollow rotating shaft is driven by the servo motor fixed at the bottom of the lower baffle plate, the periphery of the hollow rotating shaft is fixed with the digestion rotary plate, the digestion rotary plate is arranged in the round hole, clamping grooves for placing digestion cups are formed in the periphery of the digestion rotary plate, and the bottom and the upper part of the digestion cups are respectively matched with the upper baffle plate and the lower baffle plate; the vibrating device is arranged at the bottom of the lower baffle plate, and a movable digestion cup cover is arranged on the upper baffle plate corresponding to the vibrating device; the liquid injection pipe and the liquid suction pipe are respectively positioned at two sides of the movable digestion cup cover, the pipe heads of the liquid injection pipe and the liquid suction pipe respectively penetrate through the upper baffle plate and penetrate into the digestion cup, and the pipe tails of the liquid injection pipe and the liquid suction pipe are respectively connected with a peristaltic pump; an arc-shaped opening is formed in one side of the upper baffle, one part of the sampling turntable is arranged at the arc-shaped opening, and a film support on the sampling turntable corresponds to the clamping groove on the digestion turntable at the lower part; the mouth of the air blowing pipe is positioned above the leftmost film support.
The cutter supporting mechanism comprises a fixed plate, a left guide column, a right guide column, a first motor and a second motor; the lower parts of the left guide post and the right guide post are respectively fixed on the bottom plate, one end of the fixing plate is fixedly connected with the lower part of the cutter, the other end of the fixing plate is fixedly connected with the upper parts of the left guide post and the right guide post respectively, the first motor is arranged on the fixing plate, the output end of the first motor is provided with a first lead screw, the first lead screw is matched with a first lead screw sleeve, the first lead screw sleeve is fixed at one end of a first sliding plate, the first sliding plate is connected with the left guide post through a first sliding sleeve, the other end of the first sliding plate is connected with a telescopic pipe, the telescopic pipe is inserted into the lower part of the cutter and is in sealing fit with the lower part of the cutter, and the upper air tap is arranged at the lower part of the telescopic pipe; the second motor is fixed on the right guide post through a connecting plate, the output end of the second motor is provided with a second screw rod, the second screw rod is matched with a second screw rod sleeve, the second screw rod sleeve is fixed at one end of a second sliding plate, the second sliding plate is connected with the left guide post through a second sliding sleeve, the other end of the second sliding plate is connected with a fixed pipe, the upper part of the fixed pipe is connected with the lower air tap, and the lower part of the fixed pipe is communicated with a negative pressure pump; the upper air tap and the lower air tap are respectively positioned at the upper side and the lower side of the sampling turntable and correspond to the through holes.
Preferably, the ports of the liquid injection pipe and the liquid suction pipe are respectively connected with the lifting device.
Preferably, the lifting device comprises a lifting motor, a screw rod, a lifting plate and two guide posts, wherein the two guide posts are respectively fixed on the upper baffle plate, a machine base is fixed on the upper parts of the two guide posts, the lifting motor is installed on the machine base, the output end of the lifting motor is connected with the screw rod, the screw rod is matched with the middle part of the lifting plate, the two ends of the lifting plate are respectively in sliding fit with the guide posts, and the ports of the liquid injection pipe and the liquid suction pipe are respectively fixedly connected with the outer side of the lifting plate.
Preferably, the liquid injection pipe, the liquid suction pipe and the air blowing pipe respectively penetrate through the center of the hollow rotating shaft.
Preferably, an opening is formed in one side of the middle baffle plate, and a baffle plate is hinged to the opening.
Preferably, eight through holes are uniformly formed in the disc surface of the sampling rotary disc, and each through hole is correspondingly provided with a set of overturning motor and a membrane support.
Preferably, the fixing plates are two, and the left guide post and the right guide post are sequentially fixed with the cutter up and down.
Compared with the prior art, the invention has the beneficial effects that the two motors can drive the screw rod to rotate, so that the up-and-down movement of the two air nozzles is controlled, the upper air nozzle moves downwards, and the lower air nozzle moves upwards until the two air nozzles clamp the membrane support, thereby forming a closed space, having good air tightness and improving the trapping efficiency of the filter membrane on particles. The filter membrane after gathering is driven by the sampling carousel and rotates, delivers the appointed station with the filter membrane, and the upset of upset motor, the particulate matter on the filter membrane falls into the collection cup, and this process is automatic going on in airtight space, has shielded external interference, the effectual accuracy that improves the detection. The digestion rate is improved by adding a vibration device under the digestion cup; through movable digestion bowl cover structure, guarantee not have the pollutant entering and clear up the digestion liquid in the cup and can not spill at vibration in-process.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of a cutter support mechanism according to the present invention;
FIG. 3 is a schematic structural view of a digestion mechanism according to the present invention;
FIG. 4 is a top view of FIG. 3;
FIG. 5 is a schematic view of a lifting device according to the present invention;
fig. 6 is a perspective view of a lifting device in the present invention.
Detailed Description
The following detailed description of the invention refers to the accompanying drawings and preferred embodiments.
In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
As shown in fig. 1 and fig. 2, a seven-station sampling turntable type heavy metal enrichment sampling and pretreatment system based on nano functional materials comprises a sampling mechanism 2 and a digestion mechanism 3 which are respectively fixed on a bottom plate 1, wherein the sampling mechanism comprises a cutter 201 (a PM10 cutter is adopted in the design), a sampling turntable 202, a cutter supporting mechanism 204, a turnover motor 205, a membrane support 206, an upper air tap 207, a lower air tap 208 and a filter membrane 209; the cutter can be an impact cutter, the principle is that when an air sample flows from a wide caliber to a narrow caliber, the flow rate of gas can be increased, in the design, the test proves that the speed can reach about 2m/s, the lower part is covered by oil so as to prevent particles from rebounding, the air sample can be dispersed into three paths when flowing through an impact surface, and impurities with the particle diameter larger than 10 mu m can be separated
The upper air tap and the lower air tap are thermoplastic polyurethane elastomer rubber, can move up and down along with the transfer pipe, are pressed above the filter membrane during sampling, have good air tightness, and improve the trapping efficiency of the filter membrane to particulate matters.
The filter membrane is made of nano functional material, so that the trapping efficiency of the filter membrane to particulate matters can be improved, and the dissolving efficiency of heavy metals from the filter membrane can be improved.
The sampling turntable is driven to rotate by a servo motor arranged on the bottom plate, at least two through holes are formed in the periphery of the disk surface of the sampling turntable, the membrane support is arranged in each through hole, the turnover motor is fixed at one side of each through hole, the output end of the turnover motor is connected with the membrane support, and the filter membrane is placed on the membrane support; in the invention, eight through holes are uniformly formed in the disc surface of the turntable, and each through hole is correspondingly provided with a set of turnover motor and a film support. The 8 overturning motors control overturning of the 8 membrane holders. Before starting the sampling, 8 filters were placed on 8 membrane holders, and the filters were sampled sequentially by internal program control.
As shown in fig. 2, the cutter supporting mechanism is arranged at one side of the sampling turntable, and is used for supporting the cutter and controlling the upper air tap and the lower air tap to move to the position of the filter membrane; the cutter supporting mechanism comprises a fixed plate 210, a left guide column 211, a right guide column 212, a first motor 213 and a second motor 214; the lower parts of the left guide post and the right guide post are respectively fixed on the bottom plate, one end of the fixing plate is fixedly connected with the lower part of the cutter, the other end of the fixing plate is fixedly connected with the upper parts of the left guide post and the right guide post respectively, the first motor is arranged on the fixing plate, and in order to improve the stability of the cutter, the fixing plate is two, and the left guide post, the right guide post and the cutter are sequentially fixed up and down.
As shown in fig. 2, the output end of the first motor is provided with a first screw rod 215, the first screw rod is matched with a first screw rod sleeve, the first screw rod sleeve is fixed at one end of a first sliding plate 216, the first sliding plate is connected with the left guide post through a first sliding sleeve 217, the other end of the first sliding plate is connected with a telescopic tube 218, the telescopic tube is inserted into the lower part of the cutter and is in sealing fit with the lower part of the cutter, and the upper air tap is arranged at the lower part of the telescopic tube; the first motor drives the first lead screw to rotate, and the lead screw drives the lead screw cover to reciprocate, and the lead screw cover drives first sliding plate simultaneously and removes, and first sliding plate slides on left guide post through first sliding sleeve, can drive left flexible pipe at the flexible removal of cutterbar lower part simultaneously, and this flexible pipe can insert in the cutterbar lower part and very closely with it between, adopts flexible material.
As shown in fig. 2, the second motor is fixed on the right guide post through a connecting plate 219, the output end of the second motor is provided with a second screw rod 220, the second screw rod is matched with a second screw rod sleeve, the second screw rod sleeve is fixed at one end of a second sliding plate 221, the second sliding plate is connected with the left guide post through a second sliding sleeve 222, the other end of the second sliding plate is connected with a fixed pipe 223, the upper part of the fixed pipe is connected with the lower air tap, and the lower part of the fixed pipe is communicated with a negative pressure pump; the upper air tap and the lower air tap are respectively positioned at the upper side and the lower side of the sampling turntable and correspond to the through holes.
As shown in fig. 3 and 4, the digestion mechanism 3 includes an upper baffle 301, a middle baffle 302, a lower baffle 303, a digestion rotary table 304, a servo motor 305, a liquid injection pipe 306, a liquid suction pipe 307, a gas blowing pipe 308, a vibration device 309, and a digestion cup 310; the upper baffle plate, the middle baffle plate and the lower baffle plate are fixed on the bottom plate through bolts 311, a round hole 312 is formed in the middle of the middle baffle plate, a hollow rotating shaft 313 is arranged in the middle of the round hole, the hollow rotating shaft is driven by a servo motor fixed at the bottom of the lower baffle plate, and the servo motor can control the digestion rotary table to rotate, so that one filter membrane can automatically enter a digestion station after digestion of the other filter membrane is completed. The circumference of the hollow rotating shaft is fixed with the digestion rotary table, the digestion rotary table is arranged in the round hole, the circumference of the digestion rotary table is provided with a clamping groove 314 for placing a digestion cup, and the bottom and the upper part of the digestion cup are respectively matched with the upper baffle plate and the lower baffle plate; the vibration device is arranged at the bottom of the lower baffle plate, and can accelerate digestion speed and improve digestion rate. A movable digestion cup cover 315 is arranged on the upper baffle plate corresponding to the vibration device; the movable digestion cup cover can prevent external pollution from entering the digestion cup and prevent digestion liquid from splashing. The liquid injection pipe and the liquid suction pipe are respectively positioned at two sides of the movable digestion cup cover, the pipe heads of the liquid injection pipe and the liquid suction pipe respectively penetrate through the upper baffle plate and penetrate into the digestion cup, and the pipe tails of the liquid injection pipe and the liquid suction pipe are respectively connected with a peristaltic pump; the digestion solution is pumped by peristaltic pumps to the filling tube and then to the digestion cup. The bottom of the digestion cup is provided with a certain angle, so that the heavy metal-enriched filter membrane can be immersed into the bottom of the digestion cup, and the filter membrane and the digestion liquid can be fully contacted. The digested digestion liquid is conveyed to a subsequent measuring device from the liquid suction pipe under the action of a peristaltic pump.
An arc-shaped opening 316 is formed in one side of the upper baffle, a part of the sampling turntable is arranged at the arc-shaped opening, and a film support on the sampling turntable corresponds to the clamping groove on the digestion turntable at the lower part; the mouth of the air blowing pipe is positioned above the leftmost film support.
As shown in fig. 5 and 6, the ports of the liquid injection pipe and the liquid suction pipe are respectively connected with the lifting device. The lifting device comprises a lifting motor 317, a screw rod 318, a lifting plate 319 and two guide posts 320, wherein the two guide posts are respectively fixed on the upper baffle, a base 321 is fixed on the upper parts of the two guide posts, the lifting motor is installed on the base, the output end of the lifting motor is connected with the screw rod, the screw rod is matched with the middle part of the lifting plate, the two ends of the lifting plate are respectively in sliding fit with the guide posts, and the ports of the liquid injection pipe and the liquid suction pipe are respectively fixedly connected with the outer side of the lifting plate. The liquid injection pipe and the liquid suction pipe can be controlled to move up and down through the lifting device.
In order to save space, the liquid injection pipe, the liquid suction pipe and the air blowing pipe respectively penetrate through the center of the hollow rotating shaft.
In order to facilitate the putting in and taking out of the digestion cup, an opening is arranged on one side of the middle baffle plate, and a baffle plate 322 is hinged on the opening.
The two motors can drive the screw rod to rotate so as to control the up-and-down movement of the two air nozzles, the upper air nozzle moves downwards, and the lower air nozzle moves upwards until the two air nozzles clamp the membrane support, so that a closed space is formed, the air tightness is good, and the trapping efficiency of the filter membrane on particulate matters is improved. The filter membrane after gathering is driven by the sampling carousel and rotates, delivers the appointed station with the filter membrane, and the upset of upset motor, the particulate matter on the filter membrane falls into the collection cup, and this process is automatic going on in airtight space, has shielded external interference, the effectual accuracy that improves the detection. The digestion rate is improved by adding a vibration device under the digestion cup; through movable digestion bowl cover structure, guarantee not have the pollutant entering and clear up the digestion liquid in the cup and can not spill at vibration in-process.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (8)
1. Seven-station sampling rotary disc type heavy metal enrichment sampling and pretreatment system based on nano functional materials is characterized in that: the device comprises a sampling mechanism and a digestion mechanism which are respectively fixed on a bottom plate, wherein the sampling mechanism comprises a cutter, a sampling turntable, a cutter supporting mechanism, a turnover motor, a membrane support, an upper air tap, a lower air tap and a filter membrane; the sampling turntable is driven to rotate by a servo motor arranged on the bottom plate, at least two through holes are formed in the periphery of the disk surface of the sampling turntable, the membrane support is arranged in each through hole, the turnover motor is fixed at one side of each through hole, the output end of the turnover motor is connected with the membrane support, and the filter membrane is placed on the membrane support; the cutter supporting mechanism is arranged on one side of the sampling turntable and is used for supporting a cutter and controlling the upper air tap and the lower air tap to move to the position of the filter membrane;
the digestion mechanism comprises an upper baffle, a middle baffle, a lower baffle, a digestion turntable, a servo motor, a liquid injection pipe, a liquid suction pipe, a gas blowing pipe, a vibration device and a digestion cup; the upper baffle plate, the middle baffle plate and the lower baffle plate are fixed on the bottom plate through bolts, a round hole is formed in the middle of the middle baffle plate, a hollow rotating shaft is arranged in the middle of the round hole, the hollow rotating shaft is driven by the servo motor fixed at the bottom of the lower baffle plate, the periphery of the hollow rotating shaft is fixed with the digestion rotary plate, the digestion rotary plate is arranged in the round hole, clamping grooves for placing digestion cups are formed in the periphery of the digestion rotary plate, and the bottom and the upper part of the digestion cups are respectively matched with the upper baffle plate and the lower baffle plate; the vibrating device is arranged at the bottom of the lower baffle plate, and a movable digestion cup cover is arranged on the upper baffle plate corresponding to the vibrating device; the liquid injection pipe and the liquid suction pipe are respectively positioned at two sides of the movable digestion cup cover, the pipe heads of the liquid injection pipe and the liquid suction pipe respectively penetrate through the upper baffle plate and penetrate into the digestion cup, and the pipe tails of the liquid injection pipe and the liquid suction pipe are respectively connected with a peristaltic pump; an arc-shaped opening is formed in one side of the upper baffle, one part of the sampling turntable is arranged at the arc-shaped opening, and a film support on the sampling turntable corresponds to the clamping groove on the digestion turntable at the lower part; the mouth of the air blowing pipe is positioned above the leftmost film support.
2. The nano-functional material-based seven-station sampling rotary disc type heavy metal enrichment sampling and pretreatment system is characterized in that: the cutter supporting mechanism comprises a fixed plate, a left guide column, a right guide column, a first motor and a second motor; the lower parts of the left guide post and the right guide post are respectively fixed on the bottom plate, one end of the fixing plate is fixedly connected with the lower part of the cutter, the other end of the fixing plate is fixedly connected with the upper parts of the left guide post and the right guide post respectively, the first motor is arranged on the fixing plate, the output end of the first motor is provided with a first lead screw, the first lead screw is matched with a first lead screw sleeve, the first lead screw sleeve is fixed at one end of a first sliding plate, the first sliding plate is connected with the left guide post through a first sliding sleeve, the other end of the first sliding plate is connected with a telescopic pipe, the telescopic pipe is inserted into the lower part of the cutter and is in sealing fit with the lower part of the cutter, and the upper air tap is arranged at the lower part of the telescopic pipe; the second motor is fixed on the right guide post through a connecting plate, the output end of the second motor is provided with a second screw rod, the second screw rod is matched with a second screw rod sleeve, the second screw rod sleeve is fixed at one end of a second sliding plate, the second sliding plate is connected with the left guide post through a second sliding sleeve, the other end of the second sliding plate is connected with a fixed pipe, the upper part of the fixed pipe is connected with the lower air tap, and the lower part of the fixed pipe is communicated with a negative pressure pump; the upper air tap and the lower air tap are respectively positioned at the upper side and the lower side of the sampling turntable and correspond to the through holes.
3. The nano-functional material-based seven-station sampling rotary disc type heavy metal enrichment sampling and pretreatment system according to claim 1 or 2, wherein the system is characterized in that: the ports of the liquid injection pipe and the liquid suction pipe are respectively connected with the lifting device.
4. The nano-functional material-based seven-station sampling rotary disc type heavy metal enrichment sampling and pretreatment system, which is characterized in that: the lifting device comprises a lifting motor, a screw rod, a lifting plate and two guide posts, wherein the two guide posts are respectively fixed on the upper baffle plate, a machine base is fixed on the upper portions of the two guide posts, the lifting motor is installed on the machine base, the output end of the lifting motor is connected with the screw rod, the screw rod is matched with the middle of the lifting plate, the two ends of the lifting plate are respectively in sliding fit with the guide posts, and the ports of the liquid injection pipe and the liquid suction pipe are respectively fixedly connected with the outer side of the lifting plate.
5. The nano-functional material-based seven-station sampling rotary disc type heavy metal enrichment sampling and pretreatment system is characterized in that: the liquid injection pipe, the liquid suction pipe and the air blowing pipe respectively penetrate through the center of the hollow rotating shaft.
6. The nano-functional material-based seven-station sampling rotary disc type heavy metal enrichment sampling and pretreatment system is characterized in that: an opening is formed in one side of the middle baffle plate, and a baffle plate is hinged to the opening.
7. The nano-functional material-based seven-station sampling rotary disc type heavy metal enrichment sampling and pretreatment system is characterized in that: eight through holes are uniformly formed in the disc surface of the sampling rotary disc, and each through hole is correspondingly provided with a set of overturning motor and a membrane support.
8. The nano-functional material-based seven-station sampling rotary disc type heavy metal enrichment sampling and pretreatment system is characterized in that: the fixing plates are two, and the left guide post and the right guide post are sequentially fixed with the cutter up and down.
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| CN107843464A (en) * | 2017-12-01 | 2018-03-27 | 西安交通大学 | The SO of rotatory sealing multichannel3And H2SO4Sampling detector for multifunctional and method |
| CN113252765B (en) * | 2021-06-21 | 2021-09-14 | 南昌大学 | Capillary electrophoresis apparatus |
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| US6803237B2 (en) * | 2000-01-25 | 2004-10-12 | Woods Hole Oceanographic Institution | Sequential processing reaction vessel for chemical fractionation and analysis |
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| EP0416759A1 (en) * | 1989-09-08 | 1991-03-13 | CEM Corporation | Ventable rupture diaphragm-protected container for heating contained materials by microwave radiation |
| CN103558067A (en) * | 2013-11-14 | 2014-02-05 | 丹东百特仪器有限公司 | Automatic membrane changing device of multi-filter-membrane ambient air particle sampler |
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