Yellow phosphorus pipetting device

Abstract

The utility model provides a yellow phosphorus pipetting device, which relates to the technical field of environment detection devices, and comprises a pipette, a piston rod and a distance sleeve, the bottom end of the pipette is closed, a pipetting hole is arranged on the side wall of the bottom of the pipette, the piston rod is arranged in the pipette, and the distance sleeve is arranged on the piston rod. According to the transfer pipette, the problems that a traditional transfer pipette is poor in sealing and emptying effect on transferring of molten yellow phosphorus, air is likely to remain in the pipette before pipetting, air is likely to enter a port after yellow phosphorus extraction, and leakage exists when the molten yellow phosphorus is transferred can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental detection devices, in particular to a yellow phosphorus liquid transfer device. Background Art

[0002] Yellow phosphorus is highly toxic and is a water quality indicator listed in the "Surface Water Environmental Quality Standard". The main methods for detecting yellow phosphorus in water include molybdenum-antimony-anti-spectrophotometry, gas chromatography, etc. Regardless of which method is chosen, a standard stock solution of yellow phosphorus needs to be prepared. Usually, the method for preparing the standard stock solution of yellow phosphorus is as follows: add a certain volume of organic solvent (n-hexane or toluene) to a volumetric flask, cover the bottle stopper tightly, weigh accurately, then use metal tweezers to grab a small piece of yellow phosphorus, quickly add it to the volumetric flask, weigh it again to determine the mass of the added yellow phosphorus, and calculate the concentration of the standard stock solution after the yellow phosphorus is completely dissolved and fixed to volume; or place a conical flask containing yellow phosphorus (with a water layer of sufficient thickness on the top to seal and isolate the air) on an electric heating plate and heat it to about 60°C. After the yellow phosphorus melts into a liquid and forms a layer with the water seal, use a pipette to transfer the yellow phosphorus to prepare the stock solution.

[0003] Solid-state transfer method of yellow phosphorus at room temperature is difficult to control the sampling amount with tweezers. In addition, yellow phosphorus can spontaneously ignite quickly when it encounters air, and it is easy to fall during transfer, which poses a safety hazard. However, transfer of molten yellow phosphorus is easier to control the sampling amount. However, the sealing and emptying effect of traditional pipettes for transfer of molten yellow phosphorus is not good. Air is easily left in the pipette before transfer. After yellow phosphorus is extracted, the port of the pipette is easy to enter the yellow phosphorus temporarily stored in the air tube for contact reaction. Moreover, since the specific gravity of molten yellow phosphorus is 1.83, there is also a dripping problem when transferring with traditional pipettes. Therefore, the present application proposes a yellow phosphorus transfer device. Utility Model Content

[0004] In order to overcome the problems in the background technology, the utility model provides a yellow phosphorus pipetting device to solve the problems that the traditional pipette has poor sealing and emptying effects for transferring molten yellow phosphorus, air is easily retained in the tube before pipetting, air is easily introduced into the port after yellow phosphorus is extracted, and there is a dripping problem when the traditional pipette transfers molten yellow phosphorus.

[0005] A yellow phosphorus pipetting device comprises a pipette, a piston rod and a spacer sleeve, wherein the bottom end of the pipette is closed, a pipetting hole is provided on the side wall of the bottom of the pipette, the piston rod is installed in the pipette, and the spacer sleeve is movably installed up and down on the outside of the pipette to close or open the pipetting hole.

[0006] Furthermore, a hand-held handle is provided at the upper end of the pipette, a pipetting scale is provided on the wall of the pipette, and a stopper is provided at the bottom of the pipette.

[0007] Furthermore, the length of the piston rod is greater than the length of the pipette, a piston handle is provided at the top of the piston rod, a piston capable of reaching the bottom of the pipette is installed at the lower end of the piston rod, and the length of the piston is greater than the length of the pipette hole.

[0008] Furthermore, the length of the spacer sleeve is shorter than that of the pipette, and a movable handle is provided on the spacer sleeve.

[0009] Furthermore, a limit block is installed on the outer wall of the pipette at the upper end of the spacer sleeve, and the limit block is threadedly connected to the pipette.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] The present application sets a piston rod with a length greater than that of the pipette, and a piston capable of reaching the bottom end of the pipette is installed at the lower end of the piston rod. The piston length is greater than the length of the pipette hole, so that the air in the pipette can be exhausted before the yellow phosphorus is transferred to avoid contact with the yellow phosphorus, thereby solving the problem that the traditional pipette has a poor emptying effect for transferring molten yellow phosphorus.

[0012] The bottom end of the pipette of the present application is closed, a pipetting hole is provided on the side wall of the bottom of the pipette, and an upper and lower movable spacer sleeve is installed on the outer side of the pipette to facilitate closing or opening the pipetting hole before and after pipetting. The sealing operation is simple and the sealing effect is good, which solves the problems that air is easily introduced into the port of the traditional pipette after yellow phosphorus is extracted, and that the molten yellow phosphorus is easily leaked from the extraction port due to its high specific gravity. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for use in describing the embodiments are described.

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the internal structure of the utility model.

[0016] 1-pipette, 11-pipette hole, 12-handle, 13-pipette scale, 14-stopper, 2-piston rod, 21-piston, 22-piston handle, 3-space sleeve, 31-moving handle, 4-limiting block. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings to facilitate understanding by technicians.

[0018] The utility model discloses a yellow phosphorus liquid transfer device, referring to Figure 1-2A yellow phosphorus pipetting device comprises a pipette 1, a piston rod 2 and a spacer sleeve 3. The bottom end of the pipette 1 is closed, and a pipetting hole 11 is opened on the side wall of the bottom of the pipette 1. The piston rod 2 is installed in the pipette 1, and the spacer sleeve 3 is movably installed on the outside of the pipette 1 to close or open the pipetting hole 11.

[0019] The pipette 1 can be inserted into a container to extract molten yellow phosphorus through a pipette hole 11, the piston rod 2 can discharge the air in the pipette 1 through the pipette hole 11, and draw the molten yellow phosphorus into the pipette 1 through the pipette hole 11, the airtight sleeve 3 is dampedly installed on the outer wall of the pipette 1, and can move up and down on the outer wall of the pipette 1 to leak or close the pipette hole 11, thereby solving the problem of air easily entering and dripping at the port after yellow phosphorus extraction in a traditional pipette.

[0020] See also Figure 1-2 The upper end of the pipette 1 is provided with a hand-held handle 12 for convenient pipetting operation, the wall of the pipette 1 is provided with a pipetting scale 13 for convenient quantitative pipetting of yellow phosphorus, and the bottom of the pipette 1 is provided with a stopper 14 to prevent the spacer sleeve 3 from slipping.

[0021] See also Figure 1-2 The length of the piston rod 2 is greater than the length of the pipette 1. A piston handle 22 is provided at the top of the piston rod 2. A piston 21 capable of reaching the bottom end of the pipette 1 is installed at the lower end of the piston rod 2, so that the air in the pipette 1 can be discharged through the pipetting hole 11. The length of the piston 21 is greater than the length of the pipetting hole 11, so as to ensure that the piston 21 closes the pipetting hole 11 after reaching the bottom of the pipette 1, thereby preventing air from entering the pipette 1 again before pipetting.

[0022] See also Figure 1-2 The length of the spacer sleeve 3 is smaller than that of the pipette 1 , and a moving handle 31 is provided on the spacer sleeve 3 to facilitate the up and down operation of the spacer sleeve 3 .

[0023] See also Figure 1-2 A limit block 4 is installed on the outer wall of the pipette 1 at the upper end of the spacer sleeve 3. The limit block 4 is threadedly connected to the pipette 1. The size of the pipette hole 11 can be controlled by adjusting and limiting the up and down movement distance of the spacer sleeve 3, thereby controlling the flow rate of yellow phosphorus suction and discharge to ensure accurate pipetting of yellow phosphorus.

[0024] Working process:

[0025] Place a conical flask containing yellow phosphorus (with a water layer of sufficient thickness on the upper part to seal and isolate air) on an electric heating plate and heat it to about 60°C. The yellow phosphorus melts into a liquid state and forms a layer with the water seal. Adjust the position of the upper limit block 4 of the pipette 1, move the spacer sleeve 3 upward until it contacts the limit block 4, open the pipette hole 11 to the required aperture size, push the piston rod 2 to the bottom of the pipette 1 to exhaust the air, insert the lower end of the pipette 1 below the yellow phosphorus liquid level, lift the piston rod 2 so that the molten yellow phosphorus is drawn into the pipette 1 through the pipette hole 11 to the required scale, move the spacer sleeve 3 downward to contact the stopper 14 to close the pipette hole 11 and move the pipette 1 out of the conical flask, then insert the pipette 1 into a volumetric flask filled with a solvent, move the spacer sleeve 3 upward again to open the pipette hole 11, push the piston rod 2 downward to inject liquid yellow phosphorus into the solvent. The device improves the configuration method of the yellow phosphorus standard stock solution, which is convenient for operation and greatly improves the operation safety.

[0026] What is described 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 replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A yellow phosphorus liquid transfer device, characterized in that: The invention comprises a pipette (1), a piston rod (2) and a spacer sleeve (3); the bottom end of the pipette (1) is closed, a pipette hole (11) is provided on the side wall of the bottom of the pipette (1), the piston rod (2) is installed in the pipette (1), and the spacer sleeve (3) is movably installed on the outside of the pipette (1) to close or open the pipette hole (11).

2. The yellow phosphorus liquid transfer device according to claim 1, characterized in that: The upper end of the pipette (1) is provided with a hand-held handle (12), a pipetting scale (13) is provided on the wall of the pipette (1), and a stopper (14) is provided at the bottom of the pipette (1).

3. The yellow phosphorus liquid transfer device according to claim 1, characterized in that: The length of the piston rod (2) is greater than the length of the pipette (1); a piston handle (22) is provided at the top end of the piston rod (2); a piston (21) capable of reaching the bottom end of the pipette (1) is installed at the bottom end of the piston rod (2); and the length of the piston (21) is greater than the length of the pipette hole (11).

4. The yellow phosphorus liquid transfer device according to claim 1, characterized in that: The length of the spacer sleeve (3) is shorter than that of the pipette (1), and a movable handle (31) is provided on the spacer sleeve (3).

5. The yellow phosphorus liquid transfer device according to claim 1, characterized in that: A limit block (4) is installed on the outer wall of the pipette (1) at the upper end of the spacer sleeve (3), and the limit block (4) is threadedly connected to the pipette (1).

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