Sample spoon for low-background micro-sampling

Abstract

The utility model belongs to the technical field of laboratory precise sampling appliances, and particularly relates to a sample spoon for low-background micro-sampling, which is made of PFA (Polyfluoroalkoxy) materials and integrally formed by injection molding and comprises a handle, a main sampling part and an auxiliary sampling part, the main sampling part and the auxiliary sampling part are respectively arranged at two ends of the handle, and the main sampling part is of a smooth shovel structure. The width of the main sampling part is gradually increased from one end transited with the handle to the other end far away from the handle; the auxiliary sampling part is of a smooth round head structure and is bent towards one side from one end in transition with the handle to the other end away from the handle, the other end, away from the handle, of the auxiliary sampling part is in an arc shape, and the widest position of the auxiliary sampling part is located between the two ends. Smooth transition processing is carried out on the functional spoon head, residues are not prone to occurring, and cleaning is convenient. The functional spoon head is of a double-function design, accurate sampling of 1-100 mg-grade powder is achieved, and the multifunctional spoon head can be used for scraping viscous samples or collecting residues on the inner wall of a container.

Description

Technical Field

[0001] This utility model belongs to the technical field of laboratory precision sampling instruments, specifically a sample spoon for low-background micro-sampling. Background Technology

[0002] In fields such as chemical analysis, pharmaceutical research and development, and materials science, the accurate weighing of trace samples is crucial. Currently, commonly used sample spoons for weighing small amounts of powder (milligram level) in the laboratory can be categorized into micro-dosage spoons, hair spoons, adjustable micro-dosage spoons, disposable plastic spoons, magnetic weighing spoons, and vibrating micro-dosage spoons. Micro-dosage spoons are suitable for most powders; their stainless steel material is not easily deformed and is durable. However, metal spoons may adsorb light powders and react with acids / bases, potentially precipitating trace metal impurities in high-purity experiments, affecting analytical results. Disposable plastic spoons avoid cross-contamination and have the advantage of low cost; however, they have limited chemical compatibility, are not durable, have poor precision, and are difficult to control trace powders. Hair spoons can accurately scrape samples at the 0.1mg level, and their fine tip design reduces adhesion residue; however, they are difficult to operate, require a magnifying glass or microscope, are easily damaged, and are not suitable for large-scale weighing. Adjustable micro-dosage spoons offer flexible quantitative control and good repeatability; however, they are expensive, complex to maintain, and relatively bulky. Magnetic weighing spoons reduce powder dispersion and enable rapid transfer through magnetic adsorption; however, they are limited to magnetic samples and may interfere with surrounding precision instruments (such as electronic balances). Vibrating micro-scoops can automate operation and control of ultrafine powders, reducing human error; however, they are expensive, complex to maintain, and bulky. Furthermore, traditional spoon designs have excessively large capacities, making it difficult to accurately control micro-sampling within the 1–100 mg range, and they lack anti-residue designs, leading to sample loss and weighing errors. The risks of contamination and operational inconvenience of existing tools are particularly pronounced in fields with extremely high cleanliness requirements, such as semiconductors and the nuclear industry. Utility Model Content

[0003] In view of the above-mentioned problems of traditional sample spoons, and in order to meet the stringent requirements of modern precision experiments for sample integrity and data accuracy, the purpose of this utility model is to provide a sample spoon for low-background micro-sampling.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] The sample spoon of this utility model is integrally injection molded from PFA material, including a handle and a functional spoon head. The functional spoon head is divided into a main sampling part and an auxiliary sampling part. The main sampling part is provided at one end of the handle, and the auxiliary sampling part is provided at the other end of the handle. The main sampling part is a smooth shovel structure for accurate sampling, that is, both sides of the main sampling part are flat, and the width of the main sampling part gradually increases from the end that transitions with the handle to the end away from the handle. The auxiliary sampling part is a smooth round head structure for scraping viscous samples or collecting residues on the inner wall of a container, that is, both sides of the auxiliary sampling part are curved, and the auxiliary sampling part bends to one side from the end that transitions with the handle to the end away from the handle. The end of the auxiliary sampling part away from the handle is arc-shaped, and the widest part of the auxiliary sampling part is located between the two ends.

[0006] The surface of the handle has an anti-slip structure.

[0007] The surface of the handle has anti-slip texture.

[0008] The handle is cylindrical, 150mm long, and 3.5mm in diameter.

[0009] The main sampling section is trapezoidal, with the upper base of the trapezoid being the end that transitions with the handle, and the lower base of the trapezoid being the other end that is away from the handle.

[0010] The main sampling section has a length of 15mm, the upper base of the trapezoid has a width of 5mm, and the lower base of the trapezoid has a width of 7mm.

[0011] The auxiliary sampling section has a length of 6mm, a maximum width of 5mm, and a minimum width of 3.5mm.

[0012] The transition areas between the main sampling section and the handle, as well as the transition areas between the auxiliary sampling section and the handle, have been thickened to enhance mechanical strength.

[0013] The advantages and positive effects of this utility model are as follows:

[0014] 1. The functional spoon head of this utility model has a smooth transition treatment, which makes it less likely to leave residue and easy to clean.

[0015] 2. The functional spoon head of this utility model is a dual-function design, which can not only achieve accurate sampling of powders in the range of 1 to 100 mg, but also be used for scraping viscous samples or collecting residues on the inner wall of containers.

[0016] 3. The handle of this utility model is designed with anti-slip features, making it suitable for operation inside a glove box.

[0017] 4. This utility model is made of PFA material through one-piece injection molding, which has extremely low background pollution (metal leaching amount <0.05ppb), is corrosion resistant, and has little impact on sample testing.

[0018] 5. This invention can be repeatedly autoclaved or acid-soaked to avoid cross-contamination. Attached Figure Description

[0019] Figure 1 This is a top view of the structure of this utility model;

[0020] Figure 2 This is a front view of the structure of this utility model;

[0021] Wherein: 1 is the main sampling unit, 2 is the handle, and 3 is the auxiliary sampling unit. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings.

[0023] like Figure 1 , Figure 2 As shown, the sample spoon of this utility model is integrally injection molded from PFA (Perfluoroalkoxy) material, including a handle 2 and a functional spoon head. The functional spoon head is divided into a main sampling part 1 and an auxiliary sampling part 3. The main sampling part 1 is provided at one end of the handle 2, and the auxiliary sampling part 3 is provided at the other end of the handle 2. The main sampling part 1 has a smooth shovel structure, that is, both the front and back of the main sampling part 1 are flat. The width of the main sampling part 1 gradually increases from the end that transitions with the handle 2 to the other end away from the handle 2. The main sampling part 1 can achieve accurate sampling of 1 to 100 mg. The auxiliary sampling part 3 has a smooth round head structure, that is, both the front and back of the auxiliary sampling part 3 are arc surfaces. The auxiliary sampling part 3 bends to one side from the end that transitions with the handle 2 to the other end away from the handle 2. The other end of the auxiliary sampling part 3 away from the handle 2 is arc-shaped. The widest part of the auxiliary sampling part 3 is located between the two ends. The auxiliary sampling part 3 is used for scraping viscous samples or collecting residues on the inner wall of the container.

[0024] The surface of handle 2 has an anti-slip structure. In this embodiment, handle 2 is cylindrical, with a length of 150mm and a diameter of 3.5mm; the surface of handle 2 is provided with anti-slip texture, suitable for operation inside the glove box.

[0025] In this embodiment, the main sampling part 1 is trapezoidal, with the upper base of the trapezoid being the end that transitions with the handle 2, and the lower base of the trapezoid being the other end away from the handle 2. The length of the main sampling part 1 is 15mm, the width of the upper base of the trapezoid is 5mm, and the width of the lower base of the trapezoid is 7mm.

[0026] In this embodiment, the auxiliary sampling part 3 has a length of 6mm, a maximum width of 5mm, a minimum width of 3.5mm, and the same diameter as the handle 2.

[0027] In this embodiment, the transition areas between the main sampling part 1 and the handle 2, as well as the transition areas between the auxiliary sampling part 3 and the handle 2, are thickened (1.2 mm) to enhance mechanical strength.

[0028] This invention utilizes the ultra-low leaching characteristics (metal impurities <0.05ppb) and corrosion resistance (resistance to concentrated acids, strong alkalis, and high temperatures up to 260℃) of PFA material to solve the problems of contamination risk of traditional metal spoons and easy adsorption of residues by plastic spoons. It is particularly suitable for technical fields with stringent requirements for sampling accuracy and cleanliness, such as semiconductor materials, high-purity chemicals, pharmaceutical research and development, nuclear industry, and nanomaterials, or for the pollution-free micro-transfer of radioactive samples.

Claims

1. A sample spoon for low-background micro-sampling, characterized in that: The sample spoon is integrally injection molded from PFA material, including a handle (2) and a functional spoon head. The functional spoon head is divided into a main sampling part (1) and an auxiliary sampling part (3). One end of the handle (2) is provided with the main sampling part (1), and the other end of the handle (2) is provided with the auxiliary sampling part (3). The main sampling part (1) is a smooth shovel structure for accurate sampling, that is, both the front and back sides of the main sampling part (1) are flat. The width of the main sampling part (1) is transitioned from the handle (2). One end gradually increases in size towards the other end away from the handle (2); the auxiliary sampling part (3) is a smooth round head structure for scraping viscous samples or collecting residues on the inner wall of the container, that is, both the front and back sides of the auxiliary sampling part (3) are arc surfaces, the auxiliary sampling part (3) bends to one side from the end that transitions with the handle (2) to the other end away from the handle (2), the other end of the auxiliary sampling part (3) away from the handle (2) is arc-shaped, and the widest part of the auxiliary sampling part (3) is located between the two ends.

2. The sample spoon for low-background micro-sampling according to claim 1, characterized in that: The surface of the handle (2) has an anti-slip structure.

3. The sample spoon for low-background micro-sampling according to claim 2, characterized in that: The surface of the handle (2) is provided with anti-slip texture.

4. The sample spoon for low-background micro-sampling according to claim 1, characterized in that: The handle (2) is cylindrical, with a length of 150 mm and a diameter of 3.5 mm.

5. The sample spoon for low-background micro-sampling according to claim 1, characterized in that: The main sampling part (1) is trapezoidal, with the upper base of the trapezoid being the end that transitions with the handle (2) and the lower base of the trapezoid being the other end that is away from the handle (2).

6. The sample spoon for low-background micro-sampling according to claim 5, characterized in that: The length of the main sampling part (1) is 15mm, the width of the upper base of the trapezoid is 5mm, and the width of the lower base of the trapezoid is 7mm.

7. The sample spoon for low-background micro-sampling according to claim 1, characterized in that: The auxiliary sampling part (3) has a length of 6 mm, a maximum width of 5 mm, and a minimum width of 3.5 mm.

8. The sample spoon for low-background micro-sampling according to claim 1, characterized in that: The transition areas between the main sampling part (1) and the handle (2) and the auxiliary sampling part (3) and the handle (2) are all thickened to enhance mechanical strength.

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