An interference-resistant solid sample digestion device

Abstract

The utility model relates to environmental and food analysis technical field discloses an anti -interference solid sample digestion device, including heating insulation cavity, horizontal rotation axis, buckle, digestion reactor, first bearing and second bearing, wherein, first bearing and second bearing all are fixed in the inside side wall of heating insulation cavity, horizontal rotation axis includes first axle part and second axle part, first axle part rotatably sets up in the heating insulation cavity inside through first bearing and second bearing, second axle part rotatably seals through heating insulation cavity and with first axle part integral type connection, and the digestion reactor is fixed in the first axle part of horizontal rotation axis through buckle, and the digestion reactor is fixed on horizontal rotation axis, and under the synergistic effect of gravity, solid -liquid two -phase in the quartz tube is in the state of violent stirring, compares static digestion, and the digestion reaction rate, digestion degree and uniformity are enhanced significantly.

Description

Technical Field

[0001] This utility model relates to the field of environmental and food analysis technology, and in particular to an interference-resistant solid sample digestion device. Background Technology

[0002] Digestion is a common sample pretreatment method in environmental and food analysis. For example, the national standard GB 5009.268-2016, "National Food Safety Standard - Determination of Multiple Elements in Food," specifies sample pretreatment methods for microwave digestion, pressure vessel digestion, and wet digestion, with the digestion solution used to determine 29 elements. The industry standard HJ 1315-2023, "Determination of Total Metallic Elements in Soil and Sediments - Inductively Coupled Plasma Mass Spectrometry," specifies sample pretreatment methods for microwave digestion and hot plate digestion, with the digestion solution used to determine 19 metallic elements.

[0003] Microwave digestion is currently the most commonly used method, but it has two shortcomings:

[0004] (1) Polytetrafluoroethylene is the main material for microwave digestion reactor lining. However, with the strict control of polyfluorinated and perfluorinated compounds in recent years, there are strict requirements for fluorinated compounds and fluoride ions in environmental and food samples. Polytetrafluoroethylene-lined reactors will undoubtedly interfere with the analysis and detection of such samples.

[0005] (2) Solid samples have a liquid-solid interface during digestion, requiring vigorous stirring to enhance the digestion reaction rate, degree of digestion, and uniformity. However, microwave digestion is generally static or the digestion pan rotates slowly to ensure the uniformity of microwave heating. Traditional magnetic stirring and mechanical stirring are difficult to achieve in microwave digestion, leading to problems such as uneven and incomplete digestion. Utility Model Content

[0006] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide an anti-interference solid sample digestion device to solve the problem that traditional magnetic stirring and mechanical stirring are difficult to achieve in the microwave digestion process, resulting in uneven and incomplete digestion.

[0007] The present invention adopts the following technical solution:

[0008] An interference-resistant solid sample digestion device includes a heating and insulation chamber, a horizontal rotating shaft, a snap fastener, a digestion reactor, a first bearing, and a second bearing. The first and second bearings are both fixed to the inner sidewall of the heating and insulation chamber. The horizontal rotating shaft includes a first shaft portion and a second shaft portion. The first shaft portion is rotatably disposed inside the heating and insulation chamber via the first and second bearings. The second shaft portion rotatably and sealed through the heating and insulation chamber and integrally connected to the first shaft portion. The digestion reactor is fixed to the first shaft portion of the horizontal rotating shaft via the snap fastener.

[0009] Preferably, in the above-mentioned anti-interference solid sample digestion device, the heating and heat preservation cavity includes a cavity body, a temperature controller, a temperature sensor, and a heating element; wherein, the temperature sensor and the heating element are both disposed inside the cavity body, the signal output terminal of the temperature sensor is connected to the signal input terminal of the temperature controller, and the signal output terminal of the temperature controller is connected to the signal input terminal of the heating element.

[0010] Preferably, in the above-mentioned anti-interference solid sample digestion device, the temperature controller is disposed on the outer wall of the cavity.

[0011] Preferably, in the above-mentioned anti-interference solid sample digestion device, the digestion reactor includes a metal tube, a quartz tube, and a fixing element, wherein the quartz tube is fixed inside the metal tube by the fixing element, and there is an annular gap between the quartz tube and the metal tube.

[0012] Preferably, in the above-mentioned anti-interference solid sample digestion device, the fixing component includes two nickel foam fixing pads, which are respectively disposed at the bottom and top of the metal tube. The two ends of the quartz tube are fixed by the two nickel foam fixing pads, thereby fixing the quartz tube inside the metal tube.

[0013] Preferably, in the above-mentioned anti-interference solid sample digestion device, the quartz tube has a closed internal space for placing the fixed sample and digestion solution.

[0014] Preferably, in the above-mentioned anti-interference solid sample digestion device, a plurality of buckles are provided on the horizontal rotating shaft, and a plurality of digestion reactors are fixed perpendicularly to the horizontal rotating shaft by the plurality of buckles.

[0015] Preferably, in the above-mentioned anti-interference solid sample digestion device, the inner diameter of the quartz tube is between 10 and 20 mm, the length is between 100 and 200 mm, and the effective volume is between 25 and 50 mL.

[0016] Preferably, in the above-mentioned anti-interference solid sample digestion device, the digestion reactor further includes a pipe end seal, a single-sided opening of the metal tube, and the pipe end seal detachably closes the single-sided opening of the metal tube.

[0017] Preferably, in the above-mentioned anti-interference solid sample digestion device, the metal tube is made of 316, 316L, HC276 or Inconel 625 stainless steel, the inner diameter of the metal tube is 1.25 to 2 times the inner diameter of the quartz tube, and the effective internal length of the metal tube is 1.2 to 1.5 times the effective length of the quartz tube.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] (1) This utility model uses a quartz tube as a digestion reaction container. Its material contains only silicon dioxide and is chemically inert. It does not interfere with any of the cations and anions to be tested in environmental and food solid samples.

[0020] (2) The digestion reactor is designed as a double-layer structure, fixed with a nickel foam pad and an annular gap. Deionized water can be added to the annular gap. The pressure difference between the inside and outside of the quartz tube is balanced by the phenomenon that the saturated vapor pressure inside and outside the quartz tube is equal at the same temperature.

[0021] (3) The digestion reactor is fixed on a horizontal rotating shaft. Under the synergistic effect of gravity, the solid and liquid phases in the quartz tube are in a state of violent stirring. Compared with static digestion, the digestion reaction rate, digestion degree and uniformity are significantly enhanced. Attached Figure Description

[0022] 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 the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of an anti-interference solid sample digestion device according to an embodiment of the present invention.

[0024] Figure label:

[0025] 1. Heating and insulation chamber; 101. Chamber body; 102. Temperature controller; 103. Temperature sensor; 104. Heating element; 2. Horizontal rotating shaft; 201. First shaft part; 202. Second shaft part; 3. Snap-fit; 4. Digestion reactor; 401. Metal tube; 402. Quartz tube; 403. Fixing component; 4031. Nickel foam fixing pad; 404. Annular gap; 405. Tube opening seal; 5. First bearing; 6. Second bearing; 7. Sample fixation; 8. Digestion solution. Detailed Implementation

[0026] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0027] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] The present invention will now be further described with reference to the accompanying drawings.

[0030] This utility model embodiment provides an interference-resistant solid sample digestion device, such as... Figure 1As shown, the interference-resistant solid sample digestion device includes a heating and heat preservation chamber 1, a horizontal rotating shaft 2, a buckle 3, a digestion reactor 4, a first bearing 5, and a second bearing 6. The first bearing 5 and the second bearing 6 are both fixed to the inner sidewall of the heating and heat preservation chamber 1. The horizontal rotating shaft 2 includes a first shaft portion 201 and a second shaft portion 202. The first shaft portion 201 is rotatably disposed inside the heating and heat preservation chamber 1 through the first bearing 5 and the second bearing 6. The second shaft portion 202 is rotatably sealed through the heating and heat preservation chamber 1 and integrally connected to the first shaft portion 201. The digestion reactor 4 is fixed to the first shaft portion of the horizontal rotating shaft 2 through the buckle 3.

[0031] In practical implementation, the second shaft portion 202 of the horizontal rotating shaft 2 is externally connected to a power source, such as a motor. Through the integrated connection between the first shaft portion 201 and the second shaft portion 202, the driving force is transmitted to the first shaft portion 201 inside the heating and insulation chamber 1. The first shaft portion 201 is stably supported by the first bearing 5 and the second bearing 6. Under the power drive, it drives the latch 3 and the digestion reactor 4 fixed on the latch 3 to rotate horizontally synchronously, ensuring thorough mixing of the sample and digestion solution within the digestion reactor 4 during rotation. The heating and insulation chamber 1 provides a sealed, high-temperature digestion environment for the entire device. The set temperature can be maintained by the built-in heating element, providing stable temperature conditions for sample digestion. Simultaneously, the insulation design of the heating and insulation chamber 1 reduces heat exchange between the inside and outside of the chamber, preventing interference from ambient temperature fluctuations on the digestion process. The second shaft 202, through a structure that rotatably seals through the heating and insulation chamber 1, ensures rotational function while preventing leakage of high-temperature gas inside the chamber and maintaining stable pressure inside the chamber. The dual-bearing (first bearing 5, second bearing 6) support design of the horizontal rotating shaft 2 reduces shaft wobbling during rotation, ensuring the stability of the digestion reactor 4 during rotation and avoiding local temperature unevenness or sample splashing caused by mechanical vibration.

[0032] The sealed structure of the heating and insulation chamber 1 isolates the external environment from the digestion temperature, preventing incomplete or excessive sample digestion due to temperature fluctuations. The horizontal rotating shaft 2, supported by the first bearing 5 and the second bearing 6, reduces mechanical vibration during rotation, minimizing its interference with the uniformity of sample mixing within the digestion reactor 4, and preventing seal failure due to shaft wobbling. The sealed design of the second shaft portion 202 of the horizontal rotating shaft 2 prevents the leakage of high-temperature, high-pressure gas from the heating and insulation chamber 1, ensuring operational safety and maintaining stable internal pressure, thus preventing pressure fluctuations from interfering with the digestion reaction. The horizontal rotating shaft 2 drives the digestion reactor 4 to rotate horizontally, causing the sample and digestion solution within the reactor 4 to continuously tumble and collide. Compared to static digestion, this significantly increases the contact area, accelerating sample dissolution and reaction rates. The constant temperature environment provided by the heating and insulation chamber 1, combined with the rotational mixing of the horizontal rotating shaft 2, ensures that samples in each digestion reactor 4 react synchronously under the same temperature conditions, reducing digestion differences between different samples and improving the consistency of batch processing. The integrated horizontal rotating shaft 2 and the supporting structure of the first bearing 5 and the second bearing 6 enhance the load-bearing capacity and operational stability of the device, which can be adapted to digestion reactors 4 of different specifications. The fasteners 3 enable quick loading and unloading, meeting the digestion needs of diverse solid samples. The design of the detachable connection between the fasteners 3 and the digestion reactor 4 facilitates later maintenance and component replacement, extending the service life of the device.

[0033] In some embodiments, the heating and heat preservation cavity 1 includes a cavity 101, a temperature controller 102, a temperature sensor 103, and a heating element 104; wherein the temperature sensor 102 and the heating element 104 are both disposed inside the cavity 101, the signal output terminal of the temperature sensor 102 is connected to the signal input terminal of the temperature controller 102, the signal output terminal of the temperature controller 102 is connected to the signal input terminal of the heating element 104, and the temperature controller 102 is disposed on the outer wall of the cavity 101.

[0034] In practical implementation, a target digestion temperature is preset by a temperature controller 102 located on the outer wall of the cavity 101. Upon receiving the preset command, the temperature controller 102 sends a start signal to the heating element 104 inside the cavity 101. The heating element 104 (such as a heating wire or heating rod) begins operation, converting electrical energy into heat energy and releasing heat into the cavity 101, causing the cavity temperature to gradually rise. During the heating process, a temperature sensor 103 inside the cavity 101 continuously monitors the actual temperature inside the cavity and transmits the real-time temperature signal to the signal input of the temperature controller 102 through its signal output terminal. The temperature controller 102 compares and analyzes the received actual temperature signal with the preset target temperature. If the actual temperature detected by the temperature sensor 103 is lower than the preset value, the temperature controller 102 sends a continuous heating command to the heating element 104 through its signal output terminal to maintain the heating state; if the actual temperature reaches or exceeds the preset value, the temperature controller 102 sends a command to stop heating or reduce power, causing the heating element 104 to stop working or reduce heat output. This ensures that the internal temperature of chamber 101 remains stable within the preset range, avoiding the impact of excessively high or low temperatures on the sample digestion effect.

[0035] In this embodiment, the temperature sensor 103 can be a thermocouple or a platinum resistance thermometer, and the heating element 104 can be a heating wire or a heating rod. In actual application scenarios, according to experimental requirements, the heating and insulation cavity 1 can be stably controlled within the range of room temperature to 250°C, and the temperature control accuracy is preferably ±1°C.

[0036] In some embodiments, the digestion reactor 4 includes a metal tube 401, a quartz tube 402 and a fixing member 403. The quartz tube 402 is fixed inside the metal tube 401 by the fixing member 403, and there is an annular gap 404 between the quartz tube 402 and the metal tube 401.

[0037] The quartz tube 402, serving as a container for directly holding solid samples and digestion solution, possesses strong chemical stability, preventing reactions with the digestion solution that could introduce impurities. After the sample is loaded into the quartz tube 402, it is sealed to form an independent reaction space, preventing sample or gas leakage during digestion. The quartz tube 402 is fixed inside the metal tube 401 by a fixing element 403, ensuring its stability during rotation driven by the horizontal rotating shaft 2 and preventing damage from impacts or uneven sample mixing due to shaking. The fixing element 403 also acts as a buffer, reducing rigid contact between the metal tube 401 and the quartz tube 402, thus lowering the risk of mechanical damage. The annular gap 404 between the quartz tube 402 and the metal tube 401 can be filled with a medium. In the high-temperature environment provided by the heating and insulation chamber 1, the metal tube 401 evenly transfers heat to the medium within the annular gap 404, and then the medium transfers heat to the quartz tube 402, resulting in more uniform heating of the sample within the quartz tube 402 and preventing localized overheating. Meanwhile, the annular gap 404 can buffer the expansion stress of the quartz tube 402 caused by high temperature, balance the structural stress caused by the temperature difference between the metal tube 401 and the quartz tube 402, and improve the safety of the overall device.

[0038] In some embodiments, the fastener 403 includes two nickel foam fixing pads 4031, which are respectively disposed at the bottom and top of the metal tube 401. The two ends of the quartz tube 402 are fixed by the two nickel foam fixing pads 4031, thereby fixing the quartz tube 402 inside the metal tube 401.

[0039] In this embodiment, the two ends of the quartz tube 402 are precisely positioned by two foamed nickel fixing pads 4031. This structure, with both ends fixed, can firmly restrict the axial and radial displacement of the quartz tube 402 when the horizontal rotating shaft 2 drives the device to rotate, ensuring its stability within the metal tube 401 and avoiding damage to the tube wall due to shaking or uneven sample mixing. At the same time, the foamed nickel material has porous elasticity, and the two fixing pads 4031 can buffer the vibration and impact during rotation through their own deformation, reducing the rigid contact between the metal tube 401 and the quartz tube 402, and significantly reducing the risk of the quartz tube 402 breaking due to mechanical stress.

[0040] In some embodiments, the quartz tube 403 has a closed internal space for placing the fixed sample 7 and the digestion solution 8.

[0041] In some embodiments, a plurality of latches 3 are provided on the horizontal rotating shaft 2, and the plurality of digestion reactors 4 are fixed perpendicularly to the horizontal rotating shaft 2 by the plurality of latches 3.

[0042] Multiple clips 3 can simultaneously fix multiple digestion reactors 4, for example, one clip 3 can fix one digestion reactor 4, enabling simultaneous digestion of multiple samples and significantly increasing the throughput of a single experiment. Compared to processing a single sample at a time, this significantly shortens the analysis cycle for large batches of samples, making it particularly suitable for scenarios requiring batch testing, such as food and soil samples. Vertical fixing means that the digestion reactor 4 and the horizontal rotation axis 2 are perpendicular to each other in a relatively fixed state.

[0043] In some embodiments, the inner diameter of the quartz tube 402 is between 10 and 20 mm, the length is between 100 and 200 mm, and the effective volume is between 25 and 50 mL.

[0044] In this embodiment, an effective volume of 25–50 mL can meet the digestion requirements of most solid samples, avoiding insufficient mixing of sample and digestion solution due to insufficient volume, while also preventing energy waste caused by excessive volume. An inner diameter of 10–20 mm allows the sample and digestion solution within the quartz tube 402 to quickly absorb heat, reducing the radial temperature gradient. A length of 100–200 mm balances the axial heat transfer efficiency, preventing excessive temperature differences at both ends due to excessive tube length, and ensuring consistent sample digestion conditions in all areas of the tube.

[0045] In some embodiments, the digestion reactor 4 further includes a port seal 405, a one-sided opening of the metal tube 401, and the port seal 405 detachably closes the one-sided opening of the metal tube 401.

[0046] In this embodiment, the single-sided opening design combined with a detachable seal allows operators to quickly remove or insert the quartz tube 402 from the metal tube 401, facilitating sample loading and unloading, as well as cleaning and replacing the quartz tube, thus improving experimental efficiency. The tube opening seal 405 effectively seals the opening of the metal tube 401, ensuring that the annular gap 404 between the quartz tube 402 and the metal tube 401 forms a closed space, preventing leakage of the medium (such as deionized water) within the annular gap, and preventing external impurities from entering the annular gap and affecting heat transfer. The detachable seal is typically made of high-pressure and high-temperature resistant materials, such as fluororubber or metal gaskets, which maintain good sealing performance when high pressure is generated during the digestion reaction, preventing medium leakage or device rupture due to excessive pressure, and improving the overall safety factor of the equipment.

[0047] In some embodiments, the metal tube 401 is made of 316, 316L, HC276 or Inconel 625 stainless steel, the inner diameter of the metal tube 401 is 1.25 to 2 times the inner diameter of the quartz tube 402, and the effective internal length of the metal tube 401 is 1.2 to 1.5 times the effective length of the quartz tube 403.

[0048] 316 and 316L stainless steel, as well as HC276 and Inconel 625 alloys, all possess excellent acid and oxidation resistance, enabling them to withstand high-temperature and high-pressure corrosive gases (such as nitric acid vapor and chlorine gas) that may be generated during the digestion process. This prevents corrosion damage to the metal tubes and significantly extends the service life of the device. The inner diameter of the metal tube 401 is 1.25 to 2 times that of the quartz tube 402, ensuring that the annular gap 404 has sufficient space to fill the heat transfer medium, allowing heat to be evenly transferred from the metal tube to the quartz tube. The length is 1.2 to 1.5 times that of the quartz tube, ensuring sufficient installation space for the fixing components 403 at both ends of the quartz tube, while avoiding heat loss due to an excessively long annular gap, thus balancing heat transfer efficiency and structural compactness. The size ratio design of the metal tube 401 and the quartz tube 402 can reduce the stress caused by the difference in thermal expansion coefficients at high temperatures, and prevent the quartz tube 402 from being squeezed and damaged by the metal tube 401. At the same time, the length allowance of the metal tube 401 also provides sufficient space for fixing the quartz tube 403, ensuring its stability during rotation or vibration.

[0049] The feasibility and advancement of the interference-resistant solid sample digestion device provided by this utility model will be further illustrated below with two examples, which are examples of the use of the interference-resistant solid sample digestion device in the determination of different elements.

[0050] Example 1: According to the national standard GB5009.268-2016 Food Safety Standard - Determination of Multiple Elements in Food, 26 elements, including boron, sodium, magnesium, aluminum, potassium, calcium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, arsenic, selenium, strontium, molybdenum, cadmium, tin, antimony, barium, mercury, thallium, and lead, were determined in raisins using pressure vessel digestion method + inductively coupled plasma mass spectrometry.

[0051] First, the raisin sample was pulverized evenly using a high-speed pulverizer. 0.25g of the sample was accurately weighed and placed into a quartz tube with one end sealed. The quartz tube had an inner diameter of 15mm, a length of 200mm, and a volume of 35mL. Then, 10mL of dilute nitric acid was added, and the tube was covered and left overnight. The opening of the quartz tube was then sealed using an oxyhydrogen flame torch. Next, the sealed quartz tube was placed into a metal reactor. The reactor was made of 316L material, with an inner diameter of 25mm, a length of 280mm, and a volume of 137mL. Both ends of the reactor were fixed with nickel foam, and 50mL of deionized water was added to the annular gap. The reactor was then sealed. Finally, ... The reactor is fixed to the buckle of the rotating shaft inside the heating and insulation chamber, and can hold 50 quartz tubes (50 independent buckles) at the same time. The heating temperature is set to 180℃, the rotation speed is 120 rpm, and the time is 2 hours. Finally, after digestion, the metal reactor is removed, cooled to room temperature with water, the reactor is disassembled, the quartz tubes are removed, and their outer surfaces are repeatedly rinsed three times with deionized water. The top seal is cut open with a diamond blade, all products are poured out, and the quartz tubes and the cut-off end caps are thoroughly rinsed with deionized water. After the solution is filtered and diluted to a fixed volume, the quantitative analysis of the above 26 elements is performed by inductively coupled plasma mass spectrometry.

[0052] Example 2: According to the industry standard "HJ1315-2023 Determination of Total Metal Elements in Soil and Sediments by Inductively Coupled Plasma Mass Spectrometry", 19 elements were determined in the soil, including silver, arsenic, barium, beryllium, bismuth, cadmium, chromium, cobalt, copper, lithium, manganese, molybdenum, nickel, antimony, strontium, lead, thallium, vanadium, and zinc.

[0053] First, accurately weigh 0.30g of the soil sample after impurity removal, crushing, and drying, and place it into a quartz tube with one end sealed. The quartz tube has an inner diameter of 18mm, a length of 200mm, and a volume of 50mL. Then, add 9mL of dilute nitric acid and 3mL of dilute hydrochloric acid, cover, and leave overnight. Next, seal the opening of the quartz tube using an oxyhydrogen flame torch. Then, place the sealed quartz tube into a metal reactor made of Inconel 625 material, with an inner diameter of 28mm, a length of 300mm, and a volume of 185mL. The reactor is fixed at both ends with nickel foam, and 75mL of deionized water is added to the annular gap. The reactor is then sealed. The reactor was fixed to the buckle on the rotating shaft inside the heating and insulation chamber, allowing for the simultaneous placement of 20 quartz tubes (20 independent buckles). The heating temperature was set to 180℃, the rotation speed to 60 rpm, and the time to 2 hours. After digestion, the metal reactor was removed, cooled to room temperature with water, disassembled, and the quartz tubes were taken out. The outer surface of the tubes was rinsed three times with deionized water. The top seal was cut open with a diamond blade, and all the products were poured into a crucible. After treatment with hydrofluoric acid and perchloric acid, the products were stored in a polyethylene bottle and quantitatively analyzed using inductively coupled plasma mass spectrometry (ICP-MS).

[0054] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. An interference-resistant solid sample digestion device, characterized in that, The device includes a heating and insulation chamber, a horizontal rotating shaft, a snap fastener, a digestion reactor, a first bearing, and a second bearing. The first and second bearings are both fixed to the inner sidewall of the heating and insulation chamber. The horizontal rotating shaft includes a first shaft portion and a second shaft portion. The first shaft portion is rotatably disposed inside the heating and insulation chamber via the first and second bearings. The second shaft portion rotatably and sealed through the heating and insulation chamber and integrally connected to the first shaft portion. The digestion reactor is fixed to the first shaft portion of the horizontal rotating shaft via the snap fastener.

2. The anti-interference solid sample digestion device according to claim 1, characterized in that, The heating and insulation cavity includes a cavity body, a temperature controller, a temperature sensor, and a heating element; wherein, the temperature sensor and the heating element are both disposed inside the cavity body, the signal output terminal of the temperature sensor is connected to the signal input terminal of the temperature controller, and the signal output terminal of the temperature controller is connected to the signal input terminal of the heating element.

3. The anti-interference solid sample digestion device according to claim 2, characterized in that, The temperature controller is located on the outer wall of the cavity.

4. The anti-interference solid sample digestion device according to claim 1, characterized in that, The digestion reactor includes a metal tube, a quartz tube, and a fixing element. The quartz tube is fixed inside the metal tube by the fixing element, and there is an annular gap between the quartz tube and the metal tube.

5. The anti-interference solid sample digestion device according to claim 3, characterized in that, The fastener includes two nickel foam fixing pads, which are respectively disposed at the bottom and top of the metal tube. The two ends of the quartz tube are fixed by the two nickel foam fixing pads, thereby fixing the quartz tube inside the metal tube.

6. The anti-interference solid sample digestion device according to claim 4, characterized in that, The quartz tube has a closed internal space for holding the fixed sample and digestion solution.

7. The anti-interference solid sample digestion device according to claim 1, characterized in that, The horizontal rotating shaft is equipped with several buckles, which are used to fix several digestion reactors perpendicular to the horizontal rotating shaft.

8. The anti-interference solid sample digestion device according to claim 4, characterized in that, The inner diameter of the quartz tube is between 10 and 20 mm, the length is between 100 and 200 mm, and the effective volume is between 25 and 50 mL.

9. The anti-interference solid sample digestion device according to claim 4, characterized in that, The digestion reactor also includes a port seal, a single-sided opening of the metal tube, and the port seal detachably closes the single-sided opening of the metal tube.

10. The anti-interference solid sample digestion device according to claim 9, characterized in that, The metal tube is made of 316, 316L, HC276 or Inconel 625 stainless steel. The inner diameter of the metal tube is 1.25 to 2 times that of the quartz tube, and the effective internal length of the metal tube is 1.2 to 1.5 times that of the quartz tube.

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