On-site multichannel soil semi-volatile organic pollutant sample preparation instrument

Abstract

The utility model provides an on-site multichannel soil semi-volatile organic pollutant sample preparation instrument, which relates to the field of soil sample on-site preparation and comprises a four-way valve, a first connector of the four-way valve is connected with an inlet of a plunger pump through a connecting pipeline, and a second connector of the four-way valve is connected with a second connector of a plunger pump. A second interface and a third interface of the four-way valve are respectively connected with a first solvent and a second solvent through connecting pipelines; outlets of the plunger pumps are respectively connected with an inlet end of a multi-position valve through connecting pipelines, a plurality of outlets of the multi-position valve are respectively connected with a soil chromatographic column through connecting pipelines, and the soil chromatographic column is arranged in a temperature control box. According to the utility model, on-site soil sample extraction does not need later tedious operation, meanwhile, quality control is facilitated, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of on-site preparation of soil samples, in particular to an on-site multi-channel soil semi-volatile organic pollutant sample preparation instrument. Background Art

[0002] The sample preparation of soil semi-volatile organic pollutants generally adopts Soxhlet extraction, oscillation extraction, ultrasonic extraction and pressurized solvent extraction. The above methods are relatively efficient sample extraction methods and play an important role in the analysis of semi-volatile organic pollutants in the laboratory.

[0003] However, sample preparation methods such as Soxhlet extraction and pressurized solvent extraction require complex equipment and occupy a large space; although the equipment for oscillation extraction and ultrasonic extraction is simple, they require subsequent precipitation and filtration steps, which are cumbersome and time-consuming. The extraction of field soil samples requires high equipment integration and does not require cumbersome subsequent operations, which is convenient for quality control and improves work efficiency. Utility Model Content

[0004] The utility model provides an on-site multi-channel soil semi-volatile organic pollutant sample preparation instrument, which solves the problems of difficulty in existing extraction technology and equipment and frequent subsequent operations.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A field multi-channel soil semi-volatile organic pollutant sample preparation instrument comprises a four-way valve, wherein a first interface of the four-way valve is connected to an inlet of a plunger pump through a connecting pipeline, and a second interface and a third interface of the four-way valve are respectively connected to a first solvent and a second solvent through connecting pipelines; an outlet of the plunger pump is respectively connected to an inlet end of a multi-position valve through connecting pipelines, and a plurality of outlets of the multi-position valve are respectively connected to a soil chromatography column through connecting pipes, and the soil chromatography column is arranged in a temperature control box.

[0007] Furthermore, a pressure sensor is connected to the three-way branch line of the connecting pipeline between the plunger pump and the multi-position valve.

[0008] Furthermore, the outlet of each soil chromatography column is connected to a sample bottle respectively.

[0009] Furthermore, the soil chromatography column comprises a chromatography column tube, a liquid distribution plate is arranged at the top end of the interior of the chromatography column tube, and a filter plate is arranged at the bottom end of the chromatography column tube.

[0010] Furthermore, the top and bottom of the chromatography column are respectively processed into threads, the top thread of the chromatography column is connected to the internal thread of the upper nut of the chromatography column, and the bottom thread of the chromatography column is connected to the internal thread of the lower nut of the chromatography column.

[0011] Furthermore, the upper nut of the chromatography column has the same structure as the lower nut of the chromatography column, and the upper nut of the chromatography column includes a sealing cone and a sealing thread.

[0012] Furthermore, all connecting pipes are made of stainless steel or polytetrafluoroethylene or peek or polypropylene materials that are resistant to organic solvents.

[0013] Furthermore, the soil chromatography column is made of stainless steel or polytetrafluoroethylene or peek or polypropylene, a material that is resistant to organic solvents.

[0014] Furthermore, the multi-position valve used may be a cut-off valve of a 6-position valve, an 8-position valve, a 10-position valve or a 12-position valve.

[0015] Furthermore, the flow rate of the plunger pump is controlled at 2-10 ml / min.

[0016] The beneficial effects of the utility model are:

[0017] The utility model does not require complicated subsequent operations for extracting on-site soil samples, and is convenient for quality control and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 Prepare an instrument structure diagram for this utility model.

[0020] Figure 2 It is a structural diagram of the soil chromatography column in the utility model.

[0021] Description of Figure Numbers:

[0022] 1. Solvent bottle; 2. Four-way valve; 21. Fourth interface; 22. Second interface; 23. Third interface; 24. First interface; 3. Plunger pump; 4. Pressure sensor; 5. Multi-position valve; 6. Soil chromatography column; 7. Temperature control box; 8. Sample bottle; 9. Sealing internal thread; 10. Sealing cone; 11. Upper nut of chromatography column; 12. Liquid distribution plate; 13. Internal thread; 14. Chromatography column tube; 15. Filter plate; 16. Lower nut of chromatography column. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the utility model. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0027] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present utility model: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0028] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0029] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0030] The utility model provides a technical solution: an on-site multi-channel soil semi-volatile organic pollutant sample preparation instrument, such as Figure 1 As shown, it is composed of a four-way valve 2, a plunger pump 3, a pressure sensor 4, a soil chromatography column 6, a temperature control box 7, a multi-position valve 5, a sample bottle 8 and a solvent bottle 1. The two diagonal interfaces of the four-way valve 2 are connected to two different solvents, one side of the middle interface is sealed, and the other side interface is connected to the plunger pump 3. Different solvents can be extracted for sample elution and extraction by valve switching. The plunger pump 3 is connected to the inlet end of the multi-position valve 5, and the connecting pipeline between the plunger pump 3 and the multi-position valve 5 is connected to the pressure sensor 4 through a three-way lead-out branch line pipeline. The pressure sensor 4 is used to detect the system pressure and alarm when the pressure is too high; the multiple outlets of the multi-position valve 5 are respectively connected to the soil chromatography column 6 placed in the temperature control box 7 to be extracted, and the outlet of each soil chromatography column 6 is respectively connected to a sample bottle 8 for collecting the extraction eluent.

[0031] The soil chromatography column 6 is made of glass, polytetrafluoroethylene or stainless steel, with an inner diameter of 15mm-19mm. The bottom of the chromatography column tube 14 is a polypropylene filter plate 15, and the top is a polypropylene liquid distribution plate 12; the top and bottom of the chromatography column tube 14 are processed into threads, which can be matched and fastened with a nut made of polytetrafluoroethylene or stainless steel. The center of the outer side of the nut is processed with a conical surface and a screw hole, which can be connected to a liquid phase pipeline made of materials such as peek or polytetrafluoroethylene.

[0032] The soil chromatography column 6 comprises an upper nut 11, a liquid distribution plate 12, a chromatography column tube 14, a filter plate 15 and a lower nut 16, wherein the upper and lower nuts comprise a sealing cone 10, a sealing internal thread 9 and a fixing nut internal thread 13.

[0033] The equipment completes the following steps to extract petroleum hydrocarbons from soil:

[0034] 1. According to the steps of soil matrix solid phase dispersion extraction, grind the soil with neutral silica gel to complete the matrix dispersion extraction process. For moist soil containing water, grind with silica gel mass in a ratio of 1:10 to the water mass, and the dehydration and matrix dispersion extraction process can be completed simultaneously.

[0035] 2. The soil treated by matrix dispersion extraction is loaded into the soil chromatography column 6, and the unfilled part of the upper part of the chromatography column is filled with quartz sand or diatomaceous earth, and a liquid distribution plate 12 is placed on the top.

[0036] 3. The two ends of the chromatography column are sealed with the upper nut 11 and the lower nut 16, and connected to the inlet and outlet of the on-site multi-channel soil semi-volatile organic pollutant sample preparation instrument through the sealing internal thread 9 and the sealing cone 10 to ensure good sealing and no liquid leakage.

[0037] 4. Set the flow rate of the plunger pump 3 to 2-10 ml / min, and switch the solvent to n-hexane or other extraction solvents according to the extraction needs; switch the multi-position valve 5 to the position for installing the soil chromatography column 6 with the corresponding number.

[0038] 5. Start the instrument to extract soil and collect the eluate.

[0039] The above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed by the present invention according to the technical solution and inventive concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An on-site multi-channel soil semi-volatile organic pollutant sample preparation instrument, characterized in that: The invention comprises a four-way valve (2), wherein a first interface (24) of the four-way valve (2) is connected to an inlet of a plunger pump (3) via a connecting pipeline, and a second interface (22) and a third interface (23) of the four-way valve (2) are respectively connected to a solvent bottle (1) via connecting pipelines; an outlet of the plunger pump (3) is respectively connected to an inlet end of a multi-position valve (5) via connecting pipelines, and a plurality of outlets of the multi-position valve (5) are respectively connected to a soil chromatography column (6) via connecting pipes, and the soil chromatography column (6) is arranged in a temperature control box (7).

2. The on-site multi-channel soil semi-volatile organic pollutant sample preparation instrument according to claim 1, characterized in that: The connecting pipeline between the plunger pump (3) and the multi-position valve (5) is connected to a pressure sensor (4) on a three-way outlet branch pipeline.

3. The on-site multi-channel soil semi-volatile organic pollutant sample preparation instrument according to claim 1, characterized in that: The outlet of each soil chromatography column (6) is connected to a sample bottle (8) respectively.

4. The on-site multi-channel soil semi-volatile organic pollutant sample preparation instrument according to claim 1, characterized in that: The soil chromatography column (6) comprises a chromatography column tube (14), the top end of the interior of the chromatography column tube (14) is provided with a liquid distribution plate (12), and the bottom end of the chromatography column tube (14) is provided with a filter plate (15).

5. The on-site multi-channel soil semi-volatile organic pollutant sample preparation instrument according to claim 4, characterized in that: The top and bottom of the chromatography column are respectively processed into threads, the top thread of the chromatography column is connected to the internal thread (13) of the upper nut (11) of the chromatography column, and the bottom thread of the chromatography column is connected to the internal thread (13) of the lower nut (16) of the chromatography column.

6. The on-site multi-channel soil semi-volatile organic pollutant sample preparation instrument according to claim 5, characterized in that: The upper nut (11) of the chromatography column has the same structure as the lower nut (16) of the chromatography column. The upper nut (11) of the chromatography column comprises a sealing cone (10) and an internal sealing thread (9).

7. The on-site multi-channel soil semi-volatile organic pollutant sample preparation instrument according to claim 1, characterized in that: All connecting pipes are made of stainless steel, PTFE, PEek or polypropylene materials that are resistant to organic solvents.

8. The on-site multi-channel soil semi-volatile organic pollutant sample preparation instrument according to claim 1, characterized in that: The material of the soil chromatography column (6) is stainless steel or polytetrafluoroethylene or peek or polypropylene, a material that is resistant to organic solvents.

9. The on-site multi-channel soil semi-volatile organic pollutant sample preparation instrument according to claim 1, characterized in that: The multi-position valve (5) used can be a 6-position valve, an 8-position valve, a 10-position valve or a 12-position valve.

10. The on-site multi-channel soil semi-volatile organic pollutant sample preparation instrument according to claim 1, characterized in that: The flow rate of the plunger pump (3) is controlled at 2-10 ml / min.

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