Multi-channel on-line pretreatment system for water quality analysis by inductively coupled plasma mass spectrometry

Abstract

The utility model discloses inductance coupling plasma mass spectrum water quality analysis uses multichannel on -line pretreatment system, include: water sample storage tank is the open upward cylinder structure, and the water sample storage tank center is provided with the support axle, and the support axle top is higher than the water sample storage tank top edge, and the support axle is slidably provided with the closure cover, and the closure cover size and shape correspond with the water sample storage tank top opening setting, and the closure cover is annularly provided with a plurality of negative pressure pipelines, and the output of negative pressure pipeline is connected peristaltic pump sample interface, and the input of negative pressure pipeline is movably connected filter tube, and the filter tube is tubular network structure, and the tubular network structure is provided with microporous membrane in the middle. The utility model discloses through multichannel simultaneously filters purification, realizes the quick enrichment of sample solution, realizes the filtration of multiple particle size samples through the filter tube of replaceable microporous membrane, improves the applicability, improves the purification quality through the circulation filtration, and the effect of circulation filtration is detected at any time through the sampling pipeline.

Description

Technical Field

[0001] This utility model relates to the field of mass spectrometry analysis technology, and in particular to a multi-channel online pretreatment system for water quality analysis using inductively coupled plasma mass spectrometry. Background Technology

[0002] In the field of water element detection, inductively coupled plasma mass spectrometry (ICP-MS) has become a core detection technology for drinking water hygiene, environmental monitoring, and industrial wastewater analysis due to its high sensitivity and simultaneous multi-element detection capability. However, ICP-MS still faces some technical challenges in actual water sample testing. First, ICP-MS has strict requirements for sample introduction conditions: total dissolved solids (TDS) < 0.2% and particle size < 0.45 μm. However, suspended particles, colloidal substances, and coexisting ions in actual water samples can severely interfere with the ionization process, leading to mass spectrometry signal suppression and memory effects. High-salt, high-TDS water samples will increase matrix effects and reduce ionization efficiency. These interfering factors directly affect the accuracy and reproducibility of the detection results. Second, there is the problem of insufficient sensitivity in ultra-trace element detection. Polyatomic ions (such as oxides and hydroxides) formed by coexisting ions in complex water samples can cover the mass channels of the target element, causing mass spectrometry interference of ultra-trace elements and severely weakening the effective signal intensity.

[0003] Therefore, when analyzing water samples, a series of pretreatment processes, such as filtration and enrichment, are required based on the water sample's properties and target elements. However, traditional water sample pretreatment methods generally employ a stepwise processing approach, such as removing particles through centrifugation and membrane filtration, followed by element enrichment using solid-phase extraction columns. Currently, commercial pretreatment systems commonly use a cascaded process of "filtration followed by enrichment." These pretreatment methods not only prolong processing time but also cause the loss of trace and ultra-trace elements due to multiple transfers. This fragmentation of pretreatment technologies severely restricts the batch testing capabilities of laboratory water samples and the timeliness requirements of emergency monitoring, becoming a key factor hindering the further development of ICP-MS technology in the field of water quality testing and analysis. Utility Model Content

[0004] This invention provides a multi-channel online pretreatment system for water quality analysis using inductively coupled plasma mass spectrometry (ICP-MS), addressing the problems of low efficiency, long processing time, and loss of trace and ultra-trace elements due to multiple transfers in existing water sample pretreatment technologies. It also fails to meet the requirements of batch testing capabilities and timely emergency monitoring for laboratory water sample analysis.

[0005] On one hand, this utility model provides a multi-channel online pretreatment system for water quality analysis using inductively coupled plasma mass spectrometry, comprising:

[0006] A water sample storage tank is a cylindrical structure with an upward-facing opening. A support shaft is located at the center of the water sample storage tank. The bottom of the support shaft is connected to the bottom of the water sample storage tank, and the top of the support shaft extends beyond the top edge of the water sample storage tank. A sealing cover is slidably mounted on the support shaft. The size and shape of the sealing cover correspond to the top opening of the water sample storage tank. Multiple negative pressure pipes are arranged in a ring around the sealing cover. The input end of the negative pressure pipe is located on the side of the sealing cover facing the water sample storage tank. The output end of the negative pressure pipe is connected to the peristaltic pump inlet. The input end of the negative pressure pipe is movably connected to a modular filter tube. The modular filter tube is a tubular network structure with two layers. A microporous membrane is disposed between the two layers of the tubular network structure. A double-layer filter medium containing enrichment material is disposed within the tubular network structure.

[0007] The peristaltic pump inlet is equipped with a peristaltic pump, which is equipped with a liquid separating valve. The liquid separating valve is equipped with a circulation branch, a sampling branch, and an injection branch. The sealing cap is equipped with a circulation pipeline and a sampling pipeline. The circulation branch is connected to the circulation pipeline via a flexible hose, and the sampling branch is connected to the sampling pipeline via a flexible hose. The sampling branch is connected to the injection branch.

[0008] In one possible implementation, the inner ring of the top edge of the water sample storage tank is provided with an annular groove, and the bottom edge of the sealing cover is provided with an inflatable sealing ring corresponding to the annular groove.

[0009] In one possible implementation, the closure cover slides via the support shaft, and the closure cover is provided with a positioning fastener.

[0010] In one possible implementation, the positioning fastener is screwed into a through hole on the closure cover, and the positioning fastener passes through the through hole and abuts against the side wall of the support shaft.

[0011] In one possible implementation, the input end of the negative pressure pipe is connected to the modular filter tube via a screw thread or snap-fit.

[0012] In one possible implementation, sealing rings are provided at the inlet of the negative pressure pipe and the outlet of the modular filter tube.

[0013] In one possible implementation, a negative pressure pump is provided between the output end of the negative pressure pipeline and the peristaltic pump inlet.

[0014] The multi-channel online pretreatment system for water quality analysis using inductively coupled plasma mass spectrometry in this invention has the following advantages:

[0015] (1) Rapid enrichment of sample solutions is achieved through simultaneous filtration and purification via multiple channels.

[0016] (2) Modular filter tubes with replaceable microporous membranes and filter media can be used to filter samples of various particle sizes, thus improving applicability.

[0017] (3) Improve the purification quality through circulation filtration and monitor the effect of circulation filtration at any time through sampling pipeline. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the location of the multi-channel online pretreatment system for water quality analysis using inductively coupled plasma mass spectrometry provided in this embodiment of the utility model;

[0020] Figure 2 A schematic diagram of the top structure of a multi-channel online pretreatment system for water quality analysis using inductively coupled plasma mass spectrometry provided in an embodiment of this utility model;

[0021] Figure 3 A schematic diagram of the overall structure of the multi-channel online pretreatment system for water quality analysis using inductively coupled plasma mass spectrometry provided in this embodiment of the present invention.

[0022] The following are the labels in the diagram: 1. Water sample storage tank; 11. Annular groove; 2. Support shaft; 3. Sealing cover; 31. Inflatable sealing ring; 32. Positioning fastener; 33. Circulation pipeline; 34. Sampling pipeline; 4. Negative pressure pipeline; 5. Peristaltic pump inlet; 6. Modular filter tube; 7. Negative pressure pump; 8. Peristaltic pump; 9. Separating valve; 91. Circulation branch; 92. Sampling branch; 93. Inlet branch. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Figure 1A schematic diagram showing the location of the multi-channel online pretreatment system for water quality analysis using inductively coupled plasma mass spectrometry (ICP-MS) provided in this embodiment of the present invention. This embodiment of the present invention provides a multi-channel online pretreatment system for water quality analysis using ICP-MS, comprising:

[0025] A water sample storage tank 1 is a cylindrical structure with its opening facing upwards. A support shaft 2 is located at the center of the water sample storage tank 1. The bottom of the support shaft 2 is connected to the bottom of the water sample storage tank 1, and the top of the support shaft 2 extends beyond the top edge of the water sample storage tank 1. A sealing cover 3 is slidably mounted on the support shaft 2. The size and shape of the sealing cover 3 correspond to the top opening of the water sample storage tank 1. Multiple negative pressure pipes 4 are arranged in a ring on the sealing cover 3. The input end of the negative pressure pipe 4 is located on the side of the sealing cover 3 facing the water sample storage tank 1. The output end of the negative pressure pipe 4 is connected to the peristaltic pump inlet 5. The input end of the negative pressure pipe 4 is movably connected to a modular filter tube 6. The modular filter tube 6 is a tubular network structure with two layers. A microporous membrane is arranged between the two layers of the tubular network structure. A double-layer filter medium containing enrichment material is arranged in the tubular network structure.

[0026] The peristaltic pump inlet 5 is equipped with a peristaltic pump 8, the peristaltic pump 8 is equipped with a liquid separating valve 9, the liquid separating valve 9 is equipped with a circulation branch 91, a sampling branch 92 and an injection branch 93, the sealing cover 3 is equipped with a circulation pipeline 33 and a sampling pipeline 34, the circulation branch 91 is connected to the circulation pipeline 33 through a hose, the sampling branch 92 is connected to the sampling pipeline 34 through a hose, and the sampling branch 92 is connected to the injection branch 93;

[0027] The water sample storage tank 1 has an annular groove 11 on the inner ring of its top edge, and the bottom edge of the sealing cover 3 has an inflatable sealing ring 31 corresponding to the annular groove 11.

[0028] For example, such as Figure 1 , 2As shown in Figure 3, the water sample storage box 1 is used to hold the sample solution. In use, the sample solution is first injected into the water sample storage box 1. Then, the microporous membrane type of the modular filter tube 6 is selected according to the detection type, that is, the pore size and material of the microporous membrane are selected. The selected microporous membrane is rolled into a cylindrical shape and inserted between the two tubular network structures of the modular filter tube 6. Then, the modular filter tube 6 is screwed into the input end of the negative pressure pipe 4 and the threads are tightened or the buckles are secured. Next, the sealing cover 3 is lowered along the support shaft 2 until it is flush against the top of the water sample storage box 1. At this time, the air-filled sealing ring 31 is inflated, causing it to expand and clamp the inner ring of the top edge of the water sample storage box 1. An annular groove 11 is provided to prevent sample contamination. After the water sample storage box 1 is sealed, the sample solution is passed through the negative pressure pipe... The sample liquid is drawn through the modular filter tube 6 to the peristaltic pump inlet 5. The filtered sample liquid is then drawn into the dispensing valve 9 via the peristaltic pump inlet 5. The dispensing valve 9 has three branches: a circulation branch 91, which is connected to the circulation pipe 33 on the sealing cap 3 via a hose. The sample liquid returns to the water sample storage tank 1 from the circulation pipe 33 to re-enter the filtration process. After a predetermined circulation filtration time, the dispensing valve 9 is adjusted to connect the sampling branch 92 to the inlet branch 93, and then connects the sampling branch 92 to the peristaltic pump 8. The circulated sample liquid is directly drawn from the water sample storage tank 1 and delivered to the inlet branch 93, where it is input into the device for detection. This allows for real-time monitoring of the filtration effect. The negative pressure pipeline 4 is connected to the peristaltic pump inlet 5 via the negative pressure pump 7, and directly connected to the circulation branch 91 to ensure rapid circulation. The sampling branch 34 is connected to the inlet branch 93 via the peristaltic pump 8 to ensure uniform sample introduction. The dispensing valve 9 has both manual and timed adjustment modes. The input end of the negative pressure pipeline is connected to a detachable modular filter tube 6. The modular filter tube 6 integrates a replaceable microporous membrane and a functional enrichment material double-layer filter medium, which can be flexibly configured according to different water sample testing requirements.

[0029] In one possible embodiment, the sealing cover 3 slides via the support shaft 2, and the sealing cover 3 is provided with a positioning fastener 32; the positioning fastener 32 is screwed into a through hole on the sealing cover 3, and the positioning fastener 32 passes through the through hole and abuts against the side wall of the support shaft 2.

[0030] For example, the positioning fastener 32 is used to fix the closing cover 3 to the support shaft 2 when the closing cover 3 is lifted.

[0031] In one possible embodiment, the input end of the negative pressure pipeline 4 is connected to the modular filter tube 6 via a screw thread or snap fastener; sealing rings are provided at the input end of the negative pressure pipeline 4 and the opening of the modular filter tube 6 respectively; a negative pressure pump 7 is provided between the output end of the negative pressure pipeline 4 and the peristaltic pump inlet interface 5.

[0032] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0033] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A multi-channel online pretreatment system for water quality analysis using inductively coupled plasma mass spectrometry, characterized in that, include: A water sample storage box (1) is a cylindrical structure with an upward-facing opening. A support shaft (2) is provided at the center of the water sample storage box (1). The bottom of the support shaft (2) is connected to the bottom of the water sample storage box (1), and the top of the support shaft (2) extends beyond the top edge of the water sample storage box (1). A sealing cover (3) is slidably disposed on the support shaft (2). The size and shape of the sealing cover (3) correspond to the top opening of the water sample storage box (1), and multiple sealing covers (3) are arranged in a ring around the sealing cover (3). A negative pressure pipe (4) is provided with its input end located on the side of the closed cover (3) facing the water sample storage tank (1). The output end of the negative pressure pipe (4) is connected to the peristaltic pump inlet (5). The input end of the negative pressure pipe (4) is movably connected to a modular filter tube (6). The modular filter tube (6) is a tubular network structure with two layers. A microporous membrane is provided between the two layers of the tubular network structure. The tubular network structure contains a double-layer filter medium with enrichment material. The peristaltic pump inlet (5) is equipped with a peristaltic pump (8), the peristaltic pump (8) is equipped with a liquid dispensing valve (9), the liquid dispensing valve (9) is equipped with a circulation branch (91), a sampling branch (92) and an injection branch (93), the sealing cap (3) is equipped with a circulation pipeline (33) and a sampling pipeline (34), the circulation branch (91) is connected to the circulation pipeline (33) through a hose, the sampling branch (92) is connected to the sampling pipeline (34) through a hose, and the sampling branch (92) is connected to the injection branch (93).

2. The multi-channel online pretreatment system for water quality analysis by inductively coupled plasma mass spectrometry according to claim 1, characterized in that, The water sample storage tank (1) has an annular groove (11) on the inner ring of its top edge, and the bottom edge of the sealing cover (3) has an inflatable sealing ring (31) corresponding to the annular groove (11).

3. The multi-channel online pretreatment system for water quality analysis by inductively coupled plasma mass spectrometry according to claim 1, characterized in that, The sealing cover (3) slides through the support shaft (2), and a positioning fastener (32) is provided on the sealing cover (3).

4. The multi-channel online pretreatment system for water quality analysis by inductively coupled plasma mass spectrometry according to claim 3, characterized in that, The positioning fastener (32) is screwed into the through hole on the closed cover (3), and the positioning fastener (32) passes through the through hole and abuts against the side wall of the support shaft (2).

5. The multi-channel online pretreatment system for water quality analysis by inductively coupled plasma mass spectrometry according to claim 1, characterized in that, The input end of the negative pressure pipe (4) is connected to the modular filter pipe (6) via a screw or snap fastener.

6. The multi-channel online pretreatment system for water quality analysis by inductively coupled plasma mass spectrometry according to claim 5, characterized in that, The input end of the negative pressure pipe (4) and the opening of the modular filter pipe (6) are respectively provided with sealing rings.

7. The multi-channel online pretreatment system for water quality analysis by inductively coupled plasma mass spectrometry according to claim 1, characterized in that, A negative pressure pump (7) is provided between the output and output ends of the negative pressure pipeline (4) and the peristaltic pump inlet (5).

Images