CN115219607A - Automatic liquid-liquid extraction pretreatment device and method for water sample and automatic water sample detection system - Google Patents
Automatic liquid-liquid extraction pretreatment device and method for water sample and automatic water sample detection system Download PDFInfo
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Abstract
The invention discloses a pretreatment device and a pretreatment method for automatic liquid-liquid extraction of a water sample and an automatic water sample detection system. The automatic liquid-liquid extraction pretreatment device for the water sample comprises a rack, and a liquid sample introduction mechanism, a nitrogen blowing mechanism, a liner tube grabbing mechanism, a solvent supply mechanism, a vortex mixing mechanism, an automatic liner tube replacing mechanism and a multi-directional movement mechanism which are arranged on the rack; the liquid sample injection mechanism is provided with a liquid sample injection needle for sucking and adding a liquid sample. The automatic liquid-liquid extraction pretreatment device for the water sample can automatically complete liquid-liquid extraction of the water sample, the treated water sample can be automatically injected into a chromatograph for detection and analysis, and the automatic liquid-liquid extraction pretreatment device is simple to operate, high in detection efficiency and friendly to the health of operators and environment.
Description
Technical Field
The invention relates to the field of detection, in particular to a pretreatment device and a pretreatment method for automatic liquid-liquid extraction of a water sample and an automatic water sample detection system.
Background
With the rapid development of industry, a large amount of various organic pollutants are discharged into the water environment along with the activities of human beings, and the organic pollutants have the characteristics of various types, low content, complex composition and great harm, thereby seriously threatening the safety of water resources. In order to know the water pollution condition, various technical means are required to detect the composition of organic matters in water, and then the source of pollutants in the water environment is traced, so that the source of the pollution source is controlled, and the water quality condition of a target water body is improved.
The organic matters in the water body can be divided into volatile organic matters (VOCs), semi-volatile organic matters (SVOCs) and non-volatile organic matters according to physical properties. The volatile organic compounds are compounds with the boiling point below 170 ℃, and mainly comprise halogenated hydrocarbon, benzene series compounds and the like; the boiling point of the semi-volatile and nonvolatile organic compounds is above 170 ℃, and the main compounds comprise polycyclic aromatic hydrocarbon, organic pesticide, chlorobenzene, nitrobenzene, aniline and the like.
The semi-volatile organic compounds and the non-volatile organic compounds are generally extracted from a water sample by a liquid-liquid extraction method, and then detected and analyzed by a gas chromatograph. The two detection and analysis methods have the following defects: the organic matter content in water is relatively low, a large amount of water samples (more than 250 mL) and dozens to hundreds of milliliters of organic solvents are required to be used for extraction in a separating funnel in a conventional liquid-liquid extraction method, then, an extracted organic phase is dried by anhydrous sodium sulfate and then concentrated and enriched by a rotary evaporator or a nitrogen blowing instrument to meet the requirement of detection sensitivity, and more samples and organic solvents are consumed in the whole process. In addition, the detection and analysis method in the prior art can only realize semi-automatic liquid-liquid extraction by using a manual mode or an extraction instrument, and after the treatment is finished, the detection and analysis method needs to be manually transferred to a chromatograph for sample detection and analysis, so that the operation is complex, time-consuming and labor-consuming. In addition, a large amount of harmful organic solvents are required to be used in the whole liquid-liquid extraction process, and the prior art needs more manual operations, so that certain harm is caused to the health of operators and the environment.
Disclosure of Invention
In view of the above, it is necessary to provide an automatic liquid-liquid extraction pretreatment apparatus, a treatment method, and an automatic water sample detection system. The automatic liquid-liquid extraction pretreatment device for the water sample can automatically complete the detection and analysis of the water sample subjected to liquid-liquid extraction treatment by automatically injecting the water sample into a chromatograph, is simple to operate, has high detection efficiency, and is healthy and environment-friendly for operators.
A water sample automatic liquid-liquid extraction pretreatment device comprises a rack, and a liquid sample introduction mechanism, a nitrogen blowing mechanism, a liner tube grabbing mechanism, a solvent supply mechanism, a vortex mixing mechanism and a multi-directional movement mechanism which are arranged on the rack; the liquid sampling mechanism is provided with a liquid sampling needle for sucking and adding a liquid sample; the nitrogen blowing mechanism is used for nitrogen blowing concentration of the sample; the liner tube grabbing mechanism is used for grabbing and moving the liner tube; the solvent supply mechanism is used for supplying an extraction solvent; the vortex mixing mechanism is used for vortex mixing of samples; the multi-direction movement mechanism can automatically acquire the liquid sampling mechanism, the nitrogen blowing mechanism or the liner tube grabbing mechanism and drive the liner tube grabbing mechanism to move.
In one embodiment, the automatic liquid-liquid extraction pretreatment device for the water sample further comprises a tool support, the tool support is arranged on a frame, and the liquid sampling mechanism, the nitrogen blowing mechanism and the liner tube grabbing mechanism are mounted on the tool support.
In one embodiment, the water sample automatic liquid-liquid extraction pretreatment device further comprises a liner tube rack, and the liner tube rack is used for placing a liner tube.
In one embodiment, the automatic liquid-liquid extraction pretreatment device for the water sample further comprises a sample holder for holding sample bottles.
The utility model provides a water sample automated inspection system, include the chromatograph and the automatic liquid-liquid extraction pretreatment device of water sample, the automatic pretreatment device of water sample can with the introduction port cooperation of chromatograph, arrange the sample in nitrogen in the bushing pipe after the automatic pretreatment device of water sample handles the sample and blow the concentration, again by the bushing pipe snatchs the mechanism and snatchs the bushing pipe and put into the analytic introduction in the introduction port of chromatograph.
In one embodiment, the chromatograph includes, but is not limited to, a gas chromatograph-mass spectrometer, a gas chromatograph-triple quadrupole mass spectrometer, and an all two-dimensional gas chromatograph-time-of-flight mass spectrometer.
A water sample automatic pretreatment method using the water sample automatic liquid-liquid extraction pretreatment device comprises the following steps:
s1: adding a predetermined amount of water sample to be analyzed into the first sample bottle; adding a predetermined amount of desiccant to the second sample vial; taking the first liner tube for standby;
s2: controlling the multi-directional movement mechanism to obtain the liquid sampling mechanism, and controlling the multi-directional movement mechanism to drive the liquid sampling mechanism to move into the solvent supply mechanism to extract a predetermined amount of the extraction solvent and inject the extraction solvent into the first sample bottle;
s3: controlling a multi-directional movement mechanism to drive a liquid sampling mechanism to move a first sample bottle to move into a vortex oscillation mechanism for vortex mixing, and standing for a preset time to extract organic matters in a water sample to be analyzed;
s4: controlling a multi-directional movement mechanism to drive a liquid sampling mechanism to absorb the supernatant liquid after layering in the first sample bottle and transfer the supernatant liquid into a second sample bottle, and controlling the multi-directional movement mechanism to drive the liquid sampling mechanism to move the second sample bottle into a vortex oscillation mechanism for vortex mixing so as to dry and remove water;
s5: controlling the multi-directional movement mechanism to drive the liquid sampling mechanism to extract a predetermined amount of liquid in the second sample bottle and add the liquid into the first liner tube;
s6: controlling the multi-directional movement mechanism to release the liquid sampling mechanism and obtain the nitrogen blowing mechanism, controlling the multi-directional movement mechanism to drive the nitrogen blowing mechanism to move into the first liner tube and blowing nitrogen to the liquid in the first liner tube to remove the solvent, and realizing concentration and enrichment of the sample;
s7: and controlling the multidirectional movement mechanism to release the nitrogen blowing mechanism and obtain the liner tube grabbing mechanism, controlling the multidirectional movement mechanism to drive the liner tube grabbing mechanism to move to a chromatographic sample inlet of a chromatograph, and controlling the multidirectional movement mechanism to drive the liner tube grabbing mechanism to move the first liner tube to the chromatographic sample inlet for the chromatograph to carry out detection and analysis.
In one embodiment, the first liner is prepared for loading with a predetermined amount of filler material, which may comprise glass wool or an adsorbent.
In one embodiment, a predetermined amount of the emulsion breaker is added simultaneously with the addition of a predetermined amount of the water sample to be analyzed to the first sample bottle.
In one embodiment, the drying agent in s1 is selected from anhydrous sodium sulfate.
The automatic liquid-liquid extraction pretreatment device for the water sample can automatically complete liquid-liquid extraction pretreatment of the water sample, the treated water sample can be automatically injected into a chromatograph for detection and analysis, and the automatic liquid-liquid extraction pretreatment device is simple to operate, high in detection efficiency and friendly to the health of operators and the environment.
Compared with the traditional pretreatment method, the automatic liquid-liquid extraction pretreatment device for the water sample has the following beneficial effects:
(1) Compared with the traditional water sample liquid-liquid extraction mode which usually consumes hundreds of milliliters of samples and tens of milliliters of organic solvent, the invention only needs about ten milliliters of samples and a few milliliters of organic solvent to extract the samples, thereby obviously reducing the sample loading amount and the solvent consumption amount.
(2) Compared with the conventional method that after liquid-liquid extraction is finished, the extraction solvent is transferred into the flask, the sample is concentrated and enriched to about 200 mu L by using a nitrogen blowing or rotary evaporation mode, and then 1 mu L of the sample is injected into a chromatograph for analysis by using a micro injector, so that the sample utilization rate is low.
(3) The liquid-liquid extraction can be automatically carried out, so that the manual participation is reduced, the accuracy is improved, and meanwhile, the artificial pollution caused in the operation process is reduced.
(4) The invention can realize that the pretreated sample is automatically injected into the chromatograph for analysis and realize the full-automatic detection of the organic matters in the water.
(5) The water sample automatic liquid-liquid extraction pretreatment device has wide application range, and the device used for sample detection is a chromatograph, including but not limited to the following types: gas Chromatograph (GC), gas chromatograph-mass spectrometer (GCMS), gas chromatograph-triple quadrupole mass spectrometer (GC-MSMS), and two-dimensional gas chromatograph-time of flight mass spectrometer (GC × GC-TOFMS).
(6) The automatic liquid-liquid extraction pretreatment device for the water sample has wide applicable treatment objects, including but not limited to surface water, underground water, drinking water and seawater.
Drawings
Fig. 1 is a schematic view of an automatic preprocessing apparatus according to an embodiment of the present invention.
Description of the reference numerals
10. An automatic pre-processing device; 100. a frame; 200. a liquid sample introduction mechanism; 300. a nitrogen blowing mechanism; 400. a tool holder; 500. a sample holder; 600. a solvent supply mechanism; 700. a vortex mixing mechanism; 900. a multi-directional movement mechanism; 1000. a liner holder.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the invention provides a pretreatment apparatus for automatic liquid-liquid extraction of a water sample.
A water sample automatic liquid-liquid extraction pretreatment device comprises a rack 100, and a liquid sampling mechanism 200, a nitrogen blowing mechanism 300, a liner tube grabbing mechanism, a solvent supply mechanism 600, a vortex mixing mechanism 700 and a multi-azimuth movement mechanism 900 which are arranged on the rack 100.
The liquid sample injection mechanism 200 has a liquid sample injection needle for sucking and adding a liquid sample.
The nitrogen blowing mechanism 300 is used for nitrogen blowing concentration of the sample.
The liner gripping mechanism is used to grip and move the liner. The liner grabbing mechanism is not shown in the drawings. The liner gripping mechanism may be a motorized gripper.
The solvent supply mechanism 600 is used to supply an extraction solvent.
The vortex mixing mechanism 700 is used for vortex mixing of the sample.
The multi-directional movement mechanism 900 can automatically acquire the liquid sampling mechanism 200, the nitrogen blowing mechanism 300 or the liner tube grabbing mechanism and drive the liner tube grabbing mechanism to move. The multi-directional movement mechanism 900 can move along the X, Y, Z directions.
Preferably, in one embodiment, the multi-directional movement mechanism 900 may be a robotic arm.
In one specific example, the water sample automatic liquid-liquid extraction pre-processing device further comprises a tool holder 400. The tool holder 400 is disposed on the rack 100, and the liquid sampling mechanism 200, the nitrogen blowing mechanism 300, and the liner grasping mechanism are mounted to the tool holder 400. The tool holder 400 is provided with three stations for placing the liquid sampling mechanism 200, the nitrogen blowing mechanism 300 and the liner tube grasping mechanism respectively.
The liquid sampling mechanism 200, the nitrogen blowing mechanism 300 and the liner tube grabbing mechanism can be respectively and independently arranged, one or more of the liquid sampling mechanism, the nitrogen blowing mechanism and the liner tube grabbing mechanism can be integrated into a whole, and the integrated mode is set, namely, one mechanism can simultaneously display the sampling, nitrogen blowing and grabbing functions.
In one specific example, the automatic liquid-liquid extraction pretreatment apparatus for water samples further comprises a liner frame 1000. The liner frame 1000 is mounted to the frame 100. The liner panels 1000 are used to place liners.
In one specific example, the automatic liquid-liquid extraction pretreatment device for water samples further comprises a sample holder 500. The sample holder 500 is mounted on the rack 100. The sample holder 500 is used to hold sample bottles.
In one embodiment, the liquid sampling mechanism 200, the nitrogen blowing mechanism 300 and the liner tube grabbing mechanism of the automatic liquid-liquid extraction pretreatment device can be made into a two-in-one or three-in-one tool.
The automatic liquid-liquid extraction pretreatment device for the water sample can automatically complete liquid-liquid extraction pretreatment on the water sample, the treated water sample can be automatically injected into a chromatograph for detection and analysis, and the device is simple to operate, high in detection efficiency, healthy for operators and environment-friendly.
The embodiment of the invention also provides an automatic water sample detection system.
The utility model provides a water sample automated inspection system, includes chromatograph and foretell water sample automatic liquid-liquid extraction pretreatment device, water sample automatic pretreatment device can with the introduction port cooperation of chromatograph, arrange the sample in nitrogen blow concentration in the bushing pipe after water sample automatic pretreatment device handles the sample, snatch the mechanism by the bushing pipe again and snatch the analytic introduction in the introduction port that the bushing pipe put into the chromatograph.
In one specific example, chromatographs include, but are not limited to, gas Chromatographs (GCs), gas chromatographs-mass spectrometers (GCMS), gas chromatographs-triple quadrupole mass spectrometers (GC-MSMS), and two-dimensional gas chromatographs-time-of-flight mass spectrometers (GC x GC-TOFMS).
The embodiment of the invention also provides an automatic water sample pretreatment method.
A water sample automatic pretreatment method using the water sample automatic liquid-liquid extraction pretreatment device comprises the following steps:
s1: adding a predetermined amount of water sample to be analyzed into a first sample bottle on a sample bottle rack, and screwing down a bottle cap; adding a predetermined amount of drying agent into a second sample bottle on the sample bottle rack, and screwing down the bottle cap; placing a first liner tube on the liner tube stand 1000 for use; the drying agent may be anhydrous sodium sulfate, although it will be appreciated that the drying agent may also be other materials, such as calcium oxide, calcium sulfate, potassium carbonate, anhydrous copper sulfate, potassium hydroxide, and the like.
s2: and controlling the multi-azimuth movement mechanism 900 to acquire the liquid sampling mechanism 200, and controlling the multi-azimuth movement mechanism 900 to drive the liquid sampling mechanism 200 to move into the solvent supply mechanism 600 to extract a predetermined amount of the extraction solvent and inject the extraction solvent into the first sample bottle.
s3: and controlling the multi-azimuth movement mechanism 900 to drive the liquid sampling mechanism 200 to move the first sample bottle to move into the vortex oscillation mechanism for vortex mixing, and standing for a preset time to extract organic matters in the water sample to be analyzed.
s4: and controlling the multi-azimuth movement mechanism 900 to drive the liquid sampling mechanism 200 to absorb the supernatant liquid after layering in the first sample bottle and transfer the supernatant liquid into the second sample bottle, and controlling the multi-azimuth movement mechanism 900 to drive the liquid sampling mechanism 200 to move the second sample bottle into the vortex oscillation mechanism for vortex mixing so as to dry and remove water.
s5: the multi-directional movement mechanism 900 is controlled to drive the liquid sampling mechanism 200 to extract a predetermined amount of liquid in the second sample bottle and add the liquid into the first liner.
s6: and controlling the multi-azimuth movement mechanism 900 to release the liquid sampling mechanism 200 and obtain the nitrogen blowing mechanism 300, and controlling the multi-azimuth movement mechanism 900 to drive the nitrogen blowing mechanism 300 to move into the first liner and carry out nitrogen blowing on the liquid in the first liner to remove the solvent, thereby realizing the concentration and enrichment of the sample.
s7: and controlling the multi-azimuth movement mechanism 900 to release the nitrogen blowing mechanism 300 and obtain the liner tube grabbing mechanism, and controlling the multi-azimuth movement mechanism 900 to drive the liner tube grabbing mechanism to grab the empty second liner tube detected in the previous detection procedure from the chromatographic sample inlet of the chromatograph and place the empty second liner tube on the liner tube rack 1000. And controlling the multi-azimuth movement mechanism 900 to drive the liner tube grabbing mechanism to move to the chromatographic sample inlet of the chromatograph, and controlling the multi-azimuth movement mechanism 900 to drive the liner tube grabbing mechanism to move the first liner tube to the chromatographic sample inlet so as to carry out detection and analysis on the chromatograph.
In one specific example, a predetermined amount of filler is added to the first liner, which is ready for use, and the filler comprises glass wool or an adsorbent.
In one particular example, when performing the automatic liquid-liquid extraction mode, a predetermined amount of a demulsifier, which includes sodium chloride, is also added simultaneously to the addition of a predetermined amount of the water sample to be analyzed to the first sample bottle. During liquid-liquid extraction, a certain amount of sodium chloride is added into the first sample bottle to serve as a demulsifier, so that the layering of an organic phase and a water phase is facilitated. If the clean water sample to be analyzed is not seriously emulsified, sodium chloride can be not added, or other compounds can be used as a demulsifying agent, or other methods such as an ultrasonic oscillation method are used for demulsifying.
Compared with the traditional pretreatment method, the automatic liquid-liquid extraction pretreatment device for the water sample has the following beneficial effects:
(1) Compared with the traditional water sample liquid-liquid extraction mode which usually consumes hundreds of milliliters of samples and tens of milliliters of organic solvent, the invention only needs about ten milliliters of samples and a few milliliters of organic solvent to extract the samples, thereby obviously reducing the sample loading amount and the solvent consumption amount.
(2) Compared with the conventional method that after liquid-liquid extraction is finished, an extraction solvent is transferred into a flask, a nitrogen blowing or rotary evaporation mode is used for concentrating and enriching a sample to about 200 mu L, a microinjector is used for injecting 1 mu L into a chromatograph for analysis, the utilization rate of the sample is low, nitrogen blowing concentration is carried out in a liner tube, and the concentrated sample is completely injected into the chromatograph for analysis, so that the utilization rate of the sample is effectively improved.
(3) The liquid-liquid extraction can be automatically carried out, so that the manual participation is reduced, the accuracy is improved, and meanwhile, the artificial pollution caused in the operation process is reduced.
(4) The invention can realize that the pretreated sample is automatically injected into the chromatograph for analysis and realize the full-automatic detection of the organic matters in the water.
(5) The water sample automatic liquid-liquid extraction pretreatment device has wide application range, and the device used for sample detection is a chromatograph, including but not limited to the following types: gas Chromatograph (GC), gas chromatograph-mass spectrometer (GCMS), gas chromatograph-triple quadrupole mass spectrometer (GC-MSMS), and two-dimensional gas chromatograph-time-of-flight mass spectrometer (GC × GC-TOFMS).
(6) The automatic liquid-liquid extraction pretreatment device for the water sample has a wide range of applicable treatment objects, including but not limited to surface water, underground water, drinking water and seawater.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (10)
1. The automatic liquid-liquid extraction pretreatment device for the water sample is characterized by comprising a rack, and a liquid sample introduction mechanism, a nitrogen blowing mechanism, a liner tube grabbing mechanism, a solvent supply mechanism, a vortex mixing mechanism and a multi-directional movement mechanism which are arranged on the rack; the liquid sampling mechanism is provided with a liquid sampling needle for sucking and adding a liquid sample; the nitrogen blowing mechanism is used for nitrogen blowing concentration of the sample; the liner gripping mechanism is used for gripping and moving the liner; the solvent supply mechanism is used for supplying an extraction solvent; the vortex mixing mechanism is used for vortex mixing of samples; the multi-azimuth movement mechanism can automatically acquire the liquid sampling mechanism, the nitrogen blowing mechanism or the liner tube grabbing mechanism and drive the liquid sampling mechanism, the nitrogen blowing mechanism or the liner tube grabbing mechanism to move.
2. The water sample automatic liquid-liquid extraction pretreatment device according to claim 1, further comprising a tool support, wherein the tool support is disposed on the frame, and the liquid sampling mechanism, the nitrogen blowing mechanism, and the liner tube grasping mechanism are mounted on the tool support.
3. The automatic pretreatment device for liquid-liquid extraction of water sample according to claim 1, further comprising a liner holder for placing a liner.
4. The automatic pretreatment device for liquid-liquid extraction of water sample according to claim 1, further comprising a sample holder for placing a sample bottle.
5. An automatic water sample detection system, which comprises a chromatograph and the automatic water sample liquid-liquid extraction pretreatment device of any one of claims 1 to 4, wherein the automatic water sample pretreatment device can be matched with a sample inlet of the chromatograph, the automatic water sample pretreatment device treats a sample and then places the sample in a liner tube for nitrogen blowing concentration, and then the liner tube grabbing mechanism grabs the liner tube and places the liner tube into the sample inlet of the chromatograph for analytic sample introduction.
6. The automatic water sample detection system according to claim 5, wherein the chromatograph includes, but is not limited to, a gas chromatograph-mass spectrometer, a gas chromatograph-triple quadrupole mass spectrometer, and a full two-dimensional gas chromatograph-time-of-flight mass spectrometer.
7. An automatic pretreatment method for water samples using the automatic liquid-liquid extraction pretreatment device for water samples according to any one of claims 1 to 4, comprising the steps of:
s1: adding a predetermined amount of water sample to be analyzed into the first sample bottle; adding a predetermined amount of desiccant to the second sample vial; taking a first liner tube for standby;
s2: controlling the multi-directional movement mechanism to obtain the liquid sampling mechanism, and controlling the multi-directional movement mechanism to drive the liquid sampling mechanism to move into the solvent supply mechanism to extract a predetermined amount of extraction solvent and inject the extraction solvent into the first sample bottle;
s3: controlling a multi-directional movement mechanism to drive a liquid sampling mechanism to move a first sample bottle to move into a vortex oscillation mechanism for vortex mixing, and standing for a preset time to extract organic matters in a water sample to be analyzed;
s4: controlling a multi-directional movement mechanism to drive a liquid sampling mechanism to absorb the supernatant liquid after layering in the first sample bottle and transfer the supernatant liquid into a second sample bottle, and controlling the multi-directional movement mechanism to drive the liquid sampling mechanism to move the second sample bottle into a vortex oscillation mechanism for vortex mixing so as to dry and remove water;
s5: controlling the multi-directional movement mechanism to drive the liquid sampling mechanism to extract a predetermined amount of liquid in the second sample bottle and add the liquid into the first liner tube;
s6: controlling the multi-azimuth movement mechanism to release the liquid sampling mechanism and obtain the nitrogen blowing mechanism, controlling the multi-azimuth movement mechanism to drive the nitrogen blowing mechanism to move into the first lining pipe and performing nitrogen blowing on the liquid in the first lining pipe to remove the solvent, and realizing concentration and enrichment of the sample;
s7: and controlling the multidirectional movement mechanism to release the nitrogen blowing mechanism and obtain the liner tube grabbing mechanism, controlling the multidirectional movement mechanism to drive the liner tube grabbing mechanism to move to a chromatographic sample inlet of a chromatograph, and controlling the multidirectional movement mechanism to drive the liner tube grabbing mechanism to move the first liner tube to the chromatographic sample inlet for the chromatograph to carry out detection and analysis.
8. The automatic pretreatment method for water samples according to claim 7, wherein a predetermined amount of filler is added into the first spare liner, and the filler comprises glass wool or adsorbent.
9. A method according to claim 7 or 8, wherein when the automatic liquid-liquid extraction mode is in use, a predetermined amount of emulsion breaker is added to the first sample bottle when a predetermined amount of sample water to be analysed is added.
10. The method for automatic pretreatment of water samples according to claim 7 or 8, wherein the drying agent in s1 is anhydrous sodium sulfate.
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