A groundwater volatile organic compound sample purge bottle filling device and its usage method

Abstract

This invention discloses a groundwater volatile organic compound (VOC) sample purge bottle filling device and its usage method, including a workbench, a block structure, a support for the filling equipment to ensure the stability of the liquid level during water sample filling; a pH value detection component, including a hydrochloric acid volumetric test tube and a water sample volumetric test tube installed on the back side of the workbench, the transmission terminals of the hydrochloric acid volumetric test tube and the water sample volumetric test tube being connected to a mixing chamber; and an adjustment device, located on the front of the workbench, used to adjust the position of the mark on the scale line. It can meet the requirements of groundwater VOC fixative filling and sample filling processes under all current environments, featuring compactness, ease of operation, and high reliability. Furthermore, the design concept can be extended to groundwater sample filling and fixative filling operations in different projects.

Description

Technical Field

[0001] This invention specifically relates to a purge bottle filling device for groundwater volatile organic compound samples and its usage method. Background Technology

[0002] According to the "Technical Guidelines for Sampling Volatile Organic Compounds in Soil and Groundwater" (HJ1019-2019), groundwater volatile organic compound samples require the pre-addition of hydrochloric acid and ascorbic acid fixatives. Furthermore, the sample needs to overflow excessively after filling to form a convex liquid surface, and the sample flow rate during filling must not exceed 100 ml / min. Appendix D of the "Technical Specification for Groundwater Environmental Monitoring" (HJ164-2020) stipulates that volatile organic compounds must be adjusted to a pH < 2 using 1+10 hydrochloric acid, and 0.01 g to 0.02 g of ascorbic acid must be added to remove residual chlorine. This presents two problems. First, the opening of the 40 ml purge bottle is very small. Even at a flow rate of 100 ml / min, it is difficult to stop filling immediately after a convex liquid surface is formed. If excessive overflow occurs, the pre-added fixative will be squeezed out, reducing the fixation effect on the analyte. Second, the pH of the solution after filling must be < 2. The samples collected on-site are complex and variable. If the groundwater is highly alkaline, it is impossible to know the required amount of fixative. Therefore, adding fixative in advance makes it difficult to guarantee that the pH of the solution will be less than 2 after filling.

[0003] Currently, the common method involves collecting groundwater, first measuring its pH value with an instrument, then measuring the pH value of 1+10 hydrochloric acid, and then calculating the volume ratio of the water sample to the fixative using the hydrogen ion concentration formula. The appropriate amount of sample and fixative is then measured with a graduated cylinder, mixed, and poured into the sampling bottle using a pipette until a convex liquid surface is formed. However, this process involves multiple filling processes and multiple containers, causing volatile components to dissipate and reducing the representativeness of the sample. Furthermore, the hydrochloric acid fixative produces acid mist during the filling process, which can corrode the surrounding environment. Relying on formula-based calculations also introduces theoretical and practical errors, making it impossible to determine an accurate volume ratio. Summary of the Invention

[0004] The purpose of this invention is to provide a groundwater volatile organic compound sample purge bottle filling device and its usage method to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a groundwater volatile organic compound sample purge bottle filling device, comprising: The workbench, a block-shaped structure, is used to support the sample sampling components and adjustment devices in the infusion device, ensuring the stability of the liquid level during the water sample infusion process; The pH value detection component includes a hydrochloric acid volumetric test tube and a water sample volumetric test tube installed on the back side of the workbench, and the transmission terminals of the hydrochloric acid volumetric test tube and the water sample volumetric test tube are connected to a mixing chamber. The adjustment device also includes a scale line set on the surface of the worktable, a glass cover covering the outer surface of the scale line, a control knob set inside the worktable, the control knob extending outside the worktable, and the control knob located on one side inside the worktable controlling the up and down movement of the scale line through a transmission unit. The sample collection assembly includes a purge bottle, a hydrochloric acid filling tube, and a water sample filling cup. Hydrochloric acid and water sample are added to the purge bottle through the marked positions until a convex liquid surface is formed.

[0006] Preferably, one hydrochloric acid volume control test tube and one water sample volume control test tube are provided, and both the hydrochloric acid volume control test tube and the water sample volume control test tube adopt a bubble string design, with each bubble having a volume of 1 ml.

[0007] Preferably, the hydrochloric acid volume determination test tube includes a first dispensing head and a first burette. The first dispensing head is bubble-shaped and covers the first burette. The first burette transmission terminal is connected to the mixing chamber.

[0008] Preferably, the water sample volume test tube includes a second dispensing head and a second burette. The second dispensing head is conical and has a filter membrane inside. The second burette's transmission terminal is connected to the mixing chamber. Both the first burette and the second burette are equipped with a first rotary switch to control the liquid entering the mixing chamber.

[0009] Preferably, a liquid measuring cup for receiving the solution is provided below the mixing chamber, a second rotary switch is provided at the bottom of the mixing chamber, and a handle is provided on the outside of the liquid measuring cup.

[0010] Preferably, the purge bottle is vertically inserted into the workbench, the water sample filling cup and the hydrochloric acid filling tube are respectively arranged on the left and right sides of the workbench, the hydrochloric acid filling tube has a thread on the outside, the workbench is provided with a tube rack, the hydrochloric acid filling tube is inserted into the tube rack, and can be moved up and down through the thread.

[0011] Preferably, an LED light is provided at the bottom of the workbench, and a control switch is provided on the outer side of the front of the workbench, and a battery cover is provided at the bottom of the workbench.

[0012] Preferably, the water sample flow and hydrochloric acid flow in the water sample filling cup and hydrochloric acid filling tube are both directed into the purge bottle.

[0013] A method for using a groundwater volatile organic compound sample purge bottle filling device includes the following steps. Step S1: First, firmly wrap the first burette with the first burette, which is in the shape of an air bubble. Then, install the second burette with a filter membrane and a cone shape on the second burette, so that both the first and second burettes extend into the mixing chamber. Step S1-2: Add hydrochloric acid solution into the first burette through the first dispensing head, and add the extracted groundwater into the second burette through the second dispensing head. Adjust the first rotary switch and the second rotary switch so that the hydrochloric acid solution in the first burette and the groundwater in the second burette both flow into the mixing chamber for mixing. Step S1-3: Turn on the second rotary switch to allow the mixed liquid in the mixing chamber to flow into the measuring cup. Pick up the measuring cup by the handle and use pH test paper to check the pH value in the measuring cup. Step S1-4: Check if the pH value is less than 2. If it meets the requirement, the volume ratio of water sample to hydrochloric acid is 1:1. If the pH value does not meet the requirement of being less than 2, increase the volume of hydrochloric acid or water sample according to the pH value to obtain a suitable volume ratio. Step S2: Insert the purge bottle vertically upwards toward the workbench, then insert the water sample filling cup into the corresponding hole, and insert the hydrochloric acid filling tube into the tube rack; Step S2-2: Rotate the control knob to align the mark with the volume ratio scale line through the transmission unit. The amount of hydrochloric acid to be added to the purge bottle is below the mark, while the amount of water sample to be added is above the mark. Step S2-3: According to the position of the mark, rotate the hydrochloric acid dosing tube until the tube head reaches the mark, and add hydrochloric acid into the purge bottle; Step S2-4: After the hydrochloric acid is added, remove the hydrochloric acid filling tube, control the flow rate through the water sample filling cup, and slowly add water sample into the purge bottle until a convex liquid surface is formed; Step S3: Remove the water filling cup and the purge bottle, and tighten the cap of the purge bottle to complete one sample sampling process.

[0014] The technical effects and advantages of this invention are as follows: The groundwater volatile organic compound sample purge bottle filling device and its usage method can meet the requirements of groundwater volatile organic compound fixative filling and sample filling processes in all current environments. It features compact size, convenient operation, and high reliability. Furthermore, the design concept can be extended to groundwater sample filling and fixative filling operations in different projects. By rotating the hydrochloric acid filling tube and adapting the thread, the hydrochloric acid filling tube can be moved until the tube head reaches the mark before adding hydrochloric acid. This effectively reduces the emission of hydrochloric acid mist. By simultaneously dripping liquid into the hydrochloric acid volume test tube and the water sample volume test tube, the pH value is determined to be less than 2, thereby obtaining a suitable volume ratio and eliminating the error between theory and practice. Attached Figure Description

[0015] Figure 1 This is a rear view of the entire invention; Figure 2 This is a front view of the entire invention; Figure 3 This is a cross-sectional view of the entire invention; Figure 4 This is a top view of the entire invention; Figure 5 This is a side view of the entire invention.

[0016] In the diagram: 1. Workbench; 2. Mixing chamber; 3. Markings; 4. Graduated lines; 5. Purge bottle; 6. Hydrochloric acid dispensing tube; 7. Water sample dispensing cup; 8. First dispensing head; 9. First burette; 10. Second dispensing head; 11. Second burette; 12. Filter membrane; 13. First rotary switch; 14. Measuring cup; 15. Second rotary switch; 16. Handle; 17. Glass cover; 18. Control knob; 19. Transmission unit; 20. Tube rack; 21. LED light; 22. Control switch; 23. Battery bottom cover. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0018] To facilitate determining a suitable volume ratio, refer to... Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the workbench 1, a block structure, supports the filling equipment. The relatively large block structure of workbench 1 increases the contact area with the placement surface, ensuring the stability of the liquid level during filling and thus improving overall stability. This ensures the stability of the liquid level during water sample filling. The pH value detection component includes a hydrochloric acid volumetric test tube and a water sample volumetric test tube installed on the back side of workbench 1. The transmission terminals of the hydrochloric acid volumetric test tube and the water sample volumetric test tube are connected to a mixing chamber 2. The main function of the mixing chamber 2 is to mix the fixative and the water sample, making the entire solution homogeneous. After mixing, the second rotary switch 15 below the mixing chamber 2 is opened to allow the solution to enter the measuring cup 14. An air guide hole is provided inside the mixing chamber 2. An adjustment device is located on the front of workbench 1, used to adjust the position of the mark 3 on the scale line 4. The sample collection assembly includes a purge bottle 5, a hydrochloric acid filling tube 6, and a water sample filling cup 7. Hydrochloric acid and water sample are added to the purge bottle 5 through the mark 3, respectively, until a convex liquid surface is formed. The workbench 1 has a cavity for inserting the purge bottle 5. The hydrochloric acid filling tube 6 and the water sample filling cup 7 are respectively set on both sides of the purge bottle 5. The hydrochloric acid filling tube 6 is rotated through the thread on the outside of the tube until the tube head reaches the mark 3, and then hydrochloric acid is added. This can effectively reduce the emission of hydrochloric acid mist.

[0019] To facilitate cutting at different locations on the aluminum tube, refer to... Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, one hydrochloric acid volume control test tube and one water sample volume control test tube are each provided, and both tubes employ a bubble string design, with each bubble having a volume of 1 ml. This bubble string design, with each bubble having a volume of 1 ml or other easily calculable volume, eliminates the possibility of reading errors that can occur with graduated tubes. The hydrochloric acid volume control test tube includes a first dispensing head 8 and a first burette 9. The first dispensing head 8 is bubble-shaped and surrounds the first burette 9. This bubble-shaped first dispensing head 8 firmly surrounds the first burette 9, preventing the diffusion of acid mist during dispensing. The first burette 9's transmission terminal is connected to the mixing chamber 2. The water sample volumetric test tube includes a second dispensing head 10 and a second burette 11. The second dispensing head 10 is conical and has a filter membrane 12 inside. The filter membrane 12 can further filter impurities in the sample and prevent the second burette 11 from becoming clogged. The transmission terminal of the second burette 11 is connected to the mixing chamber 2. Both the first burette 9 and the second burette 11 are equipped with a first rotary switch 13 to control the liquid entering the mixing chamber 2. By rotating the first rotary switch 13, the hydrochloric acid solution in the first burette 9 and the water sample in the second burette 11 can be passed into the mixing chamber 2.

[0020] Furthermore, a solution receiving cup 14 is provided below the mixing chamber 2, and a second rotary switch 15 is provided at the bottom of the mixing chamber 2. A handle 16 is provided on the outside of the solution receiving cup 14, which allows for easy removal of the solution. The pH value of the mixed solution is then tested using pH test paper or a pH meter to check if it meets the requirement of being less than 2. If the requirement is met, the volume ratio of water sample to hydrochloric acid is 1:1. If the requirement is not met, the volume of hydrochloric acid or water sample is increased according to the pH value test results to obtain a suitable volume ratio. The adjustment device also includes a scale line 4 on the surface of the workbench 1, with five graduations: 0.2:1, 0.4:1, 1:1, 2.5:1, and 5:1. A glass cover 17 covers the scale line 4, allowing the operator to easily observe the movement of the mark 3 to ensure that the mark 3 reaches the standard position of the required graduation line. A control knob 18 is provided inside the workbench 1, and the control knob 18 extends outside the workbench 1. The control knob 18 is located on one side inside the workbench 1 and controls the up and down movement of the marking line 3 through a transmission unit 19. The transmission unit 19 may specifically include a gear, two transmission belts, and rollers installed at both ends of the transmission belts, all installed inside the workbench 1. The gear is set at a perpendicular angle to the control knob 18 and meshes with it. By rotating the control knob 18, the gear is driven to rotate, and the gear meshes with the transmission belts. Under the rotation of the rollers, the transmission belts rotate. One end of the marking line 3 is installed on the transmission belt, and as the transmission belt rotates, the marking line 3 can float up and down.

[0021] The purge bottle 5 is vertically inserted into the workbench 1. The water sample filling cup 7 and the hydrochloric acid filling tube 6 are respectively set on the left and right sides of the workbench 1. The hydrochloric acid filling tube 6 has a thread on its outer side. The workbench 1 is equipped with a tube rack 20. The hydrochloric acid filling tube 6 is inserted into the tube rack 20 and can move up and down through the thread. The tube rack 20 has a through hole that matches the hydrochloric acid filling tube 6. The through hole has an internal thread that matches the thread on the surface of the hydrochloric acid filling tube 6. As the hydrochloric acid filling tube 6 rotates, it can move vertically relative to the tube rack 20. Rotate the hydrochloric acid filling tube 6 until the tube head reaches the mark 3, and then add hydrochloric acid. This can effectively reduce the emission of hydrochloric acid mist. An LED light 21 is installed at the bottom of the workbench 1, and a control switch 22 is installed on the outer side of the front of the workbench 1. A battery cover 23 is installed at the bottom of the workbench 1. By opening the battery cover 23 and installing the battery inside, the LED light 21 is activated. The LED light 21 can be turned on and off by controlling the switch 22. The LED light 21 facilitates nighttime filling operations. The flow direction of the water sample in the water sample filling cup 7 and the hydrochloric acid filling tube 6 are both guided into the purge bottle 5.

[0022] A method for using a groundwater volatile organic compound sample purge bottle 5 filling device includes the following steps. Step S1: First, firmly wrap the first burette 9 with the first burette head 8, which is in the shape of a bubble, and install the second burette head 10, which has a filter membrane 12 and is in the shape of a cone, on the second burette 11, so that both the first burette 9 and the second burette 11 extend into the mixing chamber 2. Step S1-2: Hydrochloric acid solution is dripped into the first burette 9 through the first dispensing head 8, and the extracted groundwater is dripped into the second burette 11 through the second dispensing head 10. The first rotary switch 13 and the second rotary switch 15 are adjusted so that the hydrochloric acid solution in the first burette 9 and the groundwater in the second burette 11 both flow into the mixing chamber 2 for mixing. Step S1-3: Open the second rotary switch 15 to allow the mixed liquid in the mixing chamber 2 to flow into the measuring cup 14. Take the measuring cup 14 with the handle 16 and use pH test paper to detect the pH value in the measuring cup 14. Step S1-4: Check if the pH value is less than 2. If it meets the requirement, the volume ratio of water sample to hydrochloric acid is 1:1. If the pH value does not meet the requirement of being less than 2, increase the volume of hydrochloric acid or water sample according to the pH value to obtain a suitable volume ratio. Step S2: Insert the purge bottle 5 vertically upward toward the workbench 1, then insert the water sample filling cup 7 into the corresponding hole, and insert the hydrochloric acid filling tube 6 into the tube rack 20; Step S2-2: Rotate the control knob 18 to control the mark 3 to align with the volume ratio scale line 4 through the transmission unit 19. The amount of hydrochloric acid to be added to the purge bottle 5 is below the mark 3, while the amount of water sample to be added is above the mark 3. Step S2-3: According to the position of mark 3, rotate the hydrochloric acid filling tube 6 until the tube head reaches mark 3, and add hydrochloric acid into the purge bottle 5; Step S2-4: After the hydrochloric acid is added, remove the hydrochloric acid filling tube 6, control the flow rate through the water sample filling cup 7, and slowly add water sample into the purge bottle 5 until a convex liquid surface is formed; Step S3: Remove the water filling cup and purge bottle 5, and tighten the cap on purge bottle 5 to complete one sample sampling process.

[0023] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for filling purge bottles of groundwater volatile organic compounds samples, characterized in that: include: The workbench (1) is a block structure used to support the sample sampling components and adjustment devices in the injection device, ensuring the stability of the liquid level during the water sample injection process; The pH value detection component includes a hydrochloric acid volume test tube and a water sample volume test tube installed on the back side of the workbench (1), and the transmission terminals of the hydrochloric acid volume test tube and the water sample volume test tube are connected to a mixing chamber (2). An adjustment device is provided on the front of the workbench (1) for adjusting the position of the mark (3) on the scale line (4). It also includes the scale line (4) on the surface of the workbench (1) and a glass cover (17) covering the scale line (4). A control knob (18) is provided inside the workbench (1). The control knob (18) extends outside the workbench (1). The control knob (18) is located on one side inside the workbench (1) and controls the up and down movement of the mark (3) through a transmission unit (19). The sample collection assembly includes a purge bottle (5), a hydrochloric acid filling tube (6), and a water sample filling cup (7). Hydrochloric acid and water sample are added to the purge bottle (5) through the position of the mark (3) until a convex liquid surface is formed.

2. The groundwater volatile organic compound sample purge bottle filling device according to claim 1, characterized in that: The hydrochloric acid volume control test tube and the water sample volume control test tube are each set to one, and both the hydrochloric acid volume control test tube and the water sample volume control test tube adopt a bubble string design, with each bubble having a volume of 1ml.

3. The groundwater volatile organic compound sample purge bottle filling device according to claim 2, characterized in that: The hydrochloric acid volume test tube includes a first dispensing head (8) and a first burette (9). The first dispensing head (8) is bubble-shaped and covers the first burette (9). The transmission terminal of the first burette (9) is connected to the mixing chamber (2).

4. The groundwater volatile organic compound sample purge bottle filling device according to claim 3, characterized in that: The water sample volume test tube includes a second filling head (10) and a second burette (11). The second filling head (10) is conical and has a filter membrane (12) inside. The transmission terminal of the second burette (11) is connected to the mixing chamber (2). The first burette (9) and the second burette (11) are each provided with a first rotary switch (13) to control the liquid entering the mixing chamber (2).

5. The groundwater volatile organic compound sample purge bottle filling device according to claim 4, characterized in that: A liquid measuring cup (14) for receiving solution is provided below the mixing chamber (2), a second rotary switch (15) is provided at the bottom of the mixing chamber (2), and a handle (16) is provided on the outside of the liquid measuring cup (14).

6. The groundwater volatile organic compound sample purge bottle filling device according to claim 5, characterized in that: The purge bottle (5) is vertically inserted into the workbench (1). The water sample filling cup (7) and the hydrochloric acid filling tube (6) are respectively set on the left and right sides of the workbench (1). The hydrochloric acid filling tube (6) has a thread on the outside. The workbench (1) is equipped with a tube rack (20). The hydrochloric acid filling tube (6) is inserted into the tube rack (20) and can move up and down through the thread.

7. The groundwater volatile organic compound sample purge bottle filling device according to claim 6, characterized in that: An LED light (21) is provided at the bottom of the workbench (1), and a control switch (22) is provided on the outer side of the front of the workbench (1). A battery cover (23) is provided at the bottom of the workbench (1).

8. The groundwater volatile organic compound sample purge bottle filling device according to claim 7, characterized in that: The water sample flow and hydrochloric acid flow in the water sample filling cup (7) and hydrochloric acid filling tube (6) are both directed into the purge bottle (5).

9. The method of using the groundwater volatile organic compound sample purge bottle filling device according to claim 8, characterized in that: Includes the following steps: Step (S1): First, firmly wrap the first burette (9) with the first burette (8) which is in the shape of a bubble, and install the second burette (10) which has a filter membrane (12) and is in the shape of a cone on the second burette (11), so that the first burette (9) and the second burette (11) both extend into the mixing chamber (2); Step (S1-2): Hydrochloric acid solution is dripped into the first burette (9) through the first dispensing head (8), and the extracted groundwater is dripped into the second burette (11) through the second dispensing head (10). The first rotary switch (13) and the second rotary switch (15) are adjusted so that the hydrochloric acid solution in the first burette (9) and the groundwater in the second burette (11) both flow into the mixing chamber (2) for mixing. Step (S1-3): Open the second rotary switch (15) to allow the mixed liquid in the mixing chamber (2) to flow into the measuring cup (14). Take the measuring cup (14) by the handle (16) and use pH test paper to detect the pH value in the measuring cup (14). Step (S1-4): Check if the pH value is less than 2. If it meets the requirement, the volume ratio of water sample to hydrochloric acid is 1:

1. If the pH value does not meet the requirement of being less than 2, increase the volume of hydrochloric acid or water sample according to the pH value to obtain a suitable volume ratio. Step (S2): Insert the purge bottle (5) vertically upward toward the workbench (1), then insert the water sample filling cup (7) into the corresponding hole, and insert the hydrochloric acid filling tube (6) into the tube rack (20); Step (S2-2): Rotate the control knob (18) to control the mark (3) to align with the volume ratio scale line (4) through the transmission unit (19). The amount of hydrochloric acid to be added to the purge bottle (5) is below the mark (3), while the amount of water sample to be added is above the mark (3). Step (S2-3): According to the position of the mark (3), rotate the hydrochloric acid filling tube (6) until the tube head reaches the mark (3), and add hydrochloric acid into the purge bottle (5); Step (S2-4): After the hydrochloric acid is added, remove the hydrochloric acid filling tube (6), control the flow rate through the water sample filling cup (7), and slowly add water sample into the purge bottle (5) until a convex liquid surface is formed; Step (S3): Remove the water filling cup and purge bottle (5), and tighten the cap of the purge bottle (5) to complete a sample sampling process.

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