A method for preparing a solution for collecting and preserving hydrogen sulfide

Abstract

The invention discloses a method for preparing a solution for collecting and storing hydrogen sulfide. The solution comprises the following components: triethanolamine, disodium ethylenediaminetetraacetate, sodium hydroxide, and deionized water. The method for preparing the solution comprises the following steps: 15 ml of triethanolamine, 4 g of sodium hydroxide, and 4 g of disodium ethylenediaminetetraacetate are dissolved in deionized water and the volume is fixed to 1 liter; all reagents are commonly used low-toxic reagents, so the problem that the storage time of hydrogen sulfide collected in the solution is not long is solved, and the storage time of the sample is improved from the widely used cadmium hydroxide suspension as an absorber and the determination is completed within 6 hours in the dark to the stability of more than 10 days under the condition of being stored in the dark at room temperature; the solution prepared in the scheme is used to collect hydrogen sulfide in the air, and various performance indicators meet the requirements of chemical substances in the air of the workplace in the guide for the formulation of occupational health standards; when detecting at the scene of an emergency accident, the color of the solution is kept for more than 2 days after color development.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen sulfide collection, in particular to a method for preparing a solution for collecting and preserving hydrogen sulfide. Background Art

[0002] Sulfide (S 2- ) is a weakly alkaline substance, which easily reacts with hydrogen ions in an acidic solution to generate hydrogen sulfide and escape.

[0003] In dilute alkaline solutions, sulfide ions are also unstable due to their easy oxidation. 2+ and Zn 2+ A type of metal ion solution collects hydrogen sulfide in the air, and generates metal sulfide precipitation to reduce the loss of sulfide during sampling and storage. However, the pH of the suspension produced by the metal sulfide precipitation will affect the recovery rate, and some metal complexes will undergo photolysis, so the collected samples need to be stored at room temperature and in the dark. Therefore, it is necessary to develop a method that can be stable for a long time at room temperature after hydrogen sulfide in the air is collected.

[0004] The widely used methods for determining hydrogen sulfide in the air are mainly visual colorimetry used in the workplace and methylene blue-spectrophotometry for residential atmosphere. Among them, the visual colorimetry method uses controlled highly toxic sodium arsenite as the absorption liquid, and the reagent purchase is more troublesome. The method for residential atmosphere uses an aqueous solution of cadmium sulfate, sodium hydroxide and polyvinyl ammonium phosphate for absorption, but the sample must be colored within 6 hours and determined as soon as possible. The sample storage time of this method is short; the standard substance of sulfide uses 0.01% sodium hydroxide as a solvent and is stored in a sealed and light-proof ampoule. When in use, the ampoule is opened and used once and cannot be stored for reuse; therefore, a method for preparing a solution for collecting and storing hydrogen sulfide is proposed to address the above problems. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art and at least one of the above problems, the present invention proposes a method for preparing a solution for collecting and preserving hydrogen sulfide.

[0006] A method for preparing a solution for collecting and storing hydrogen sulfide, the solution comprising the following components:

[0007] Triethanolamine;

[0008] Disodium EDTA;

[0009] Sodium hydroxide;

[0010] Aqueous solution;

[0011] Wherein, the preparation method of the solution comprises the following steps:

[0012] Step S1: 15 ml of triethanolamine, 4 g of sodium hydroxide and 4 g of disodium ethylenediaminetetraacetate were dissolved in ultrapure water and the volume was fixed to 1 liter, which was used as sample 1;

[0013] Step S2: 15 mL of triethanolamine, 4 g of sodium hydroxide, 4 g of disodium ethylenediaminetetraacetate and 1 g of zinc acetate were dissolved in ultrapure water and the volume was fixed to 1 L, which was used as sample 2.

[0014] Preferably, sample 1 is used to store a standard solution containing hydrogen sulfide, and the sulfide can be stored for more than 10 days at room temperature of 20-25°C without being protected from light, and then the color development verification is performed using the methylene blue spectrophotometry method in accordance with GB11742-1989, standard method for sanitation inspection of hydrogen sulfide in the atmosphere of residential areas, and the sulfide loss rate is less than 5%. The sulfide stored in this solution is suitable for the silver nitrate colorimetric method of hydrogen sulfide in GB11742-1989 and also suitable for the hydrogen sulfide in GB / T160.33-2004.

[0015] Preferably, in step S1, the samples 1 and 2 can be colored in a methylene blue system and a silver nitrate system after sampling and storage, so as to perform quantitative determination of the samples.

[0016] Preferably, in step S2, sample 2 is prepared by adding 1 g of zinc acetate to sample 1 to strengthen the complexation between sample 1 and sulfide ions; sample 2 is color developed using a methylene blue system, and the color stability time after color development is greater than 2 days.

[0017] Preferably, in step S2, when processing the biological material sample, after protein is precipitated with zinc acetate, sample 1 in step S1 is used for collection and detection.

[0018] Preferably, in step S1 and step S2, when preparing the solution, it is necessary to mix and fix the volume of the solution components, and after the fixing is completed, an auxiliary mechanism is used to shake the fixing bottle so that the solution in the fixing bottle is evenly mixed; the auxiliary mechanism includes a base; a slide rail is fixedly connected to one side of the base, and a No. 1 connecting seat is fixedly connected to the top of the base; screws are fixedly connected to the top two ends of the No. 1 connecting seat; a receiving bracket is slidably connected in the slide rail, and a slider is fixedly connected to the side of the receiving bracket close to the slide rail; the slider is slidably connected in the slide rail; the fixing bottle is clamped in the receiving bracket; a shell is fixedly connected to the top of the No. 1 connecting seat, and a gear is rotatably connected to the center position of the shell; a connecting shaft is fixedly connected to the end of the gear facing the fixing bracket, and the connecting shaft passes through the shell; the end of the connecting shaft passing through the outside of the shell is clamped on the fixing bracket.

[0019] Preferably, a through hole is provided at the top of the shell, and two groups of slide grooves are provided on the side wall of one end of the shell away from the receiving bracket, which are symmetrically arranged in the upper and lower directions; two groups of racks are slidably connected in the slide grooves, and the two groups of racks are symmetrically arranged in the center; the two groups of racks are meshingly connected to the gears; handles are fixedly connected to the side walls of the two groups of racks, and the handles pass through the slide grooves and are located outside the shell; a straight rod is fixedly connected to the top of one group of racks, and the straight rod passes through the through hole; a spring is sleeved on the straight rod, and the spring is arranged at the part of the straight rod located in the shell; a No. 2 connecting seat is fixedly connected to the bottom of the shell corresponding to the No. 1 connecting seat, and the screw rod passes through both ends of the No. 2 connecting seat.

[0020] Preferably, a No. 1 rotating shaft is fixedly connected to the top of the receiving bracket, and a No. 2 retaining ring is sleeved on the No. 1 rotating shaft; a fixing ring is fixedly connected to the top of the No. 1 rotating shaft; a torsion spring is sleeved on the No. 1 rotating shaft, and both ends of the torsion spring are respectively fixed to the fixing ring and the No. 2 retaining ring; a fixing shaft is fixedly connected to the side of the receiving bracket facing the shell, and the fixing shaft is coaxial with the connecting shaft; the fixing shaft and the connecting shaft are both provided with threads, and a threaded sleeve is threadedly connected between the fixing shaft and the outer side of the connecting shaft; a No. 1 retaining ring is movably connected to the middle part of the receiving bracket; a slot corresponding to the No. 1 retaining ring is provided on the side wall of the receiving bracket; the end of the No. 1 retaining ring is slidably engaged in the slot.

[0021] Preferably, a movable groove is provided in the No. 2 clamping ring, and the end of the No. 2 clamping ring is rotatably connected to a No. 2 rotating shaft; an adjusting plate is rotatably connected to the No. 2 rotating shaft, and the adjusting plate is movably connected in the movable groove.

[0022] The present invention is beneficial in that:

[0023] 1. The present invention solves the problem of short sample storage time in the methylene blue reaction system by using a low-toxic reagent. The color is maintained for more than 2 days after color development, and the color of each test is basically consistent. In the absence of a spectrophotometer, a color card with a known concentration can be prepared in advance for comparison with the color of the measured sample to obtain a semi-quantitative result. The solution prepared in the present scheme is used to collect hydrogen sulfide in the air, and various performance indicators meet the requirements of chemical substances in the workplace air in the guide for the formulation of occupational health standards.

[0024] 2. The present invention sets an auxiliary mechanism, utilizes the rack in the auxiliary mechanism to drive the gear to rotate, utilizes the clamping connection between the connecting shaft and the fixed shaft, and cooperates with the connection of the threaded sleeve. When the gear rotates, the receiving bracket can be driven to rotate a certain angle. Since the rack and the gear are coordinated in a reciprocating manner, the receiving bracket can be driven to swing back and forth. The receiving bracket is used to receive the constant volume flask, and the constant volume flask is fixed in cooperation with the No. 1 clamp ring and the No. 2 clamp ring. During the reciprocating swing of the receiving bracket, the solution in the constant volume flask can be shaken evenly. Compared with shaking evenly by manpower, this method is more convenient and suitable for experimental use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 A three-dimensional diagram of an embodiment of the present invention;

[0027] Figure 2 A first cross-sectional perspective view of an embodiment of the present invention;

[0028] Figure 3 A second cross-sectional perspective view of an embodiment of the present invention;

[0029] Figure 4 A cross-sectional view of an embodiment of the present invention.

[0030] In the figure: 1. base; 11. slide rail; 12. No. 1 connecting seat; 13. screw; 2. shell; 211. through hole; 212. slide groove; 22. No. 2 connecting seat; 23. gear; 231. connecting shaft; 24. rack; 241. straight rod; 242. spring; 243. handle; 25. threaded sleeve; 26. receiving bracket; 261. slider; 262. No. 1 retaining ring; 263. retaining groove; 27. No. 2 retaining ring; 271. fixing ring; 272. torsion spring; 273. No. 1 rotating shaft; 274. movable groove; 275. No. 2 rotating shaft; 276. adjusting plate; 3. constant volume bottle. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1-4 As shown, a method for preparing a solution for collecting and storing hydrogen sulfide, the solution composition is as follows:

[0033] Triethanolamine;

[0034] Disodium EDTA;

[0035] Sodium hydroxide;

[0036] Aqueous solution;

[0037] Wherein, the preparation method of the solution comprises the following steps:

[0038] Step S1: 15 ml of triethanolamine, 4 g of sodium hydroxide and 4 g of disodium ethylenediaminetetraacetate were dissolved in ultrapure water and the volume was fixed to 1 liter, which was used as sample 1;

[0039] Step S2: 15 mL of triethanolamine, 4 g of sodium hydroxide, 4 g of disodium ethylenediaminetetraacetate and 1 g of zinc acetate were dissolved in ultrapure water and the volume was fixed to 1 L, which was used as sample 2.

[0040] As an embodiment of the present invention, a standard solution containing hydrogen sulfide is stored using sample 1, and the sulfide can be stored for more than 10 days at room temperature of 20-25°C without being protected from light. Then, the color development verification is performed using the methylene blue spectrophotometry method in accordance with GB11742-1989, standard method for sanitation inspection of hydrogen sulfide in the atmosphere of residential areas, and the sulfide loss rate is less than 5%. The sulfide stored in this solution is suitable for the silver nitrate colorimetric method of hydrogen sulfide in GB11742-1989 and also suitable for the hydrogen sulfide in GB / T160.33-2004.

[0041] As an embodiment of the present invention, the dosage of triethanolamine, disodium ethylenediaminetetraacetate, sodium hydroxide and deionized water can be appropriately adjusted in different application scenarios; in specific applications, the dosage of triethanolamine, sodium hydroxide and disodium ethylenediaminetetraacetate can be fine-tuned according to one's own needs, and through an alkaline solution containing triethanolamine, 5 ml, using an ordinary large bubble absorption tube, hydrogen sulfide in the air can be collected at any time, and the sampling efficiency reaches 100%.

[0042] As an embodiment of the present invention, in step S1, the samples of sample one and sample two after sampling and preservation can be colored in a methylene blue system and a silver nitrate system to perform quantitative determination of the samples; when using the methylene blue system to color them for quantitative detection, compared with the current methylene blue method for residential atmosphere, the color development principle is the same, the detection limit is consistent with it, reaching 0.15ug / 5ml, and the sample storage time is extended from detection within 6h to storage for 10 days.

[0043] As an embodiment of the present invention, in step S2, sample 2 is prepared by adding 1 g of zinc acetate to sample 1 to strengthen the complexation between sample 1 and sulfide ions; sample 2 is colored using a methylene blue system, and the color stability time after color development is greater than 2 days; specifically, this solvent is used for sampling and the methylene blue system is used for color development, and when a large bubble sampling tube containing 5 ml of this solution is used to collect hydrogen sulfide in the air, the sampling is performed at 0.5 L / min, and the average sampling efficiency of short-time sampling (15 min) is 100.0%, and the penetration (adsorption) capacity can meet 10 times the occupational exposure limit for collecting an amount of 15 min (greater than 700 ug).

[0044] As an embodiment of the present invention, in step S2, when processing the biological material sample, after protein is precipitated with zinc acetate, sample 1 in step S1 is used for collection and detection.

[0045] As an embodiment of the present invention, in the step S1 and the step S2, when preparing the solution, it is necessary to mix the components of the solution and fix the volume, wherein after the fixing of the volume is completed, it is necessary to use an auxiliary mechanism to shake the fixing bottle 3 so that the solution in the fixing bottle 3 is evenly mixed; the auxiliary mechanism includes a base 1; a slide rail 11 is fixedly connected to one side of the base 1, and a No. 1 connecting seat 12 is fixedly connected to the top of the base 1; screws 13 are fixedly connected to the top two ends of the No. 1 connecting seat 12; a receiving bracket 26 is slidably connected in the slide rail 11, A slider 261 is fixedly connected to one side of the receiving bracket 26 close to the slide rail 11; the slider 261 is slidably connected in the slide rail 11; the constant volume bottle 3 is clamped in the receiving bracket 26; the top of the No. 1 connecting seat 12 is fixedly connected to the shell 2, and the gear 23 is rotatably connected to the center position inside the shell 2; the gear 23 is fixedly connected to a connecting shaft 231 at one end facing the receiving bracket 26, and the connecting shaft 231 passes through the shell 2; the end of the connecting shaft 231 that passes through the outside of the shell 2 is clamped on the receiving bracket 26.

[0046] Specifically, when testing the solution for its effect on absorbing and preserving hydrogen sulfide in the atmosphere, a large amount of the solution needs to be prepared. When preparing the solution, the mixed solution needs to be fixed to volume. The traditional method of fixing the volume requires manually shaking the fixing bottle 3 after the fixing is completed to mix the solution in the fixing bottle 3. Since a large amount of the solution needs to be prepared, it needs to be shaken after preparation to mix it. This step will cause arm soreness in the experimenter and is not conducive to routine experiments. In this scheme, an auxiliary mechanism is used to slide with the receiving bracket 26 with the help of the slide rail 11, and the gear 23 in the shell 2 is used to drive the receiving bracket 26 to swing back and forth in the slide rail 11, so as to achieve mixing of the solution in the fixing bottle 3, wherein a connecting shaft 231 fixed at one end of the gear 23 protrudes from the shell 2 and is used to connect the receiving bracket 26.

[0047] As an embodiment of the present invention, a through hole 211 is provided on the top of the shell 2, and two groups of slide grooves 212 are arranged symmetrically from top to bottom on the side wall of one end of the shell 2 away from the receiving bracket 26; two groups of racks 24 are slidably connected in the slide grooves 212, and the two groups of racks 24 are arranged symmetrically in the center; the two groups of racks 24 are meshed and connected to the gear 23; handles 243 are fixedly connected to the side walls of the two groups of racks 24, and the handles 243 pass through the slide grooves 212 and are located on the outside of the shell 2; a straight rod 241 is fixedly connected to the top of one group of racks 24, and the straight rod 241 passes through the through hole 211; a spring 242 is sleeved on the straight rod 241, and the spring 242 is arranged at the part of the straight rod 241 located in the shell 2; the bottom of the shell 2 is fixedly connected to the No. 2 connecting seat 22 corresponding to the No. 1 connecting seat 12, and the screw 13 passes through both ends of the No. 2 connecting seat 22.

[0048] Specifically, a through hole 211 is provided at the top of the housing 2. When the rack 24 inside the housing 2 is lifted by manpower, the rack 24 slides in the slide groove 212 using the handle 243 on one side thereof. At the same time, during the sliding process, the rack 24 meshes with the gear 23 and drives the gear 23 to rotate. When the gear 23 rotates, the receiving bracket 26 is driven to swing through the connecting shaft 231. Since the stroke of the rack 24 is limited, when the rack 24 moves unidirectionally to the end, the receiving bracket 26 can be driven to swing to the top of one end of the slide rail 11. Then, the rack 24 moves in the reverse direction, which can drive the receiving bracket 26 to slide in the reverse direction on the slide rail 11. When the constant volume bottle 3 is constant in volume, the rack 24 can be repeatedly driven to move up and down in the shell 2, and then the receiving bracket 26 can be driven to swing back and forth left and right in the slide rail 11, wherein a straight rod 241 fixed on a group of racks 24, the top of which passes through the shell 2, and a spring 242 is sleeved on the straight rod 241. When the rack 24 moves to the top of the shell 2, the spring 242 will be squeezed and compressed to generate elastic potential energy. The elastic potential energy generated by the compression of the spring 242 can be used to drive the rack 24 to move in the opposite direction when it moves to the top, thereby achieving the reciprocating motion effect of the receiving bracket 26.

[0049] As an embodiment of the present invention, a No. 1 rotating shaft 273 is fixedly connected to the top of the receiving bracket 26, and a No. 2 snap ring 27 is sleeved on the No. 1 rotating shaft 273; a fixing ring 271 is fixedly connected to the top of the No. 1 rotating shaft 273; a torsion spring 272 is sleeved on the No. 1 rotating shaft 273, and the two ends of the torsion spring 272 are respectively fixedly connected to the fixing ring 271 and the No. 2 snap ring 27; a fixed shaft is fixedly connected to the side of the receiving bracket 26 facing the shell 2, and the fixed shaft is coaxial with the connecting shaft 231; the fixed shaft and the connecting shaft 231 are both provided with threads, and a threaded sleeve 25 is threadedly connected to the outer sides of the fixed shaft and the connecting shaft 231; a No. 1 snap ring 262 is movably connected to the middle part of the receiving bracket 26; a slot 263 is provided on the side wall of the receiving bracket 26 corresponding to the No. 1 snap ring 262; the end of the No. 1 snap ring 262 is slidably engaged in the slot 263.

[0050] Specifically, a No. 1 rotating shaft 273 is fixed to the top of the receiving bracket 26, and a No. 2 clamping ring 27 is sleeved on the No. 1 rotating shaft 273. When the constant volume bottle 3 is clamped in the receiving bracket 26, the side wall of the constant volume bottle 3 will squeeze the No. 2 clamping ring 27 and make the No. 2 clamping ring 27 deflect outward until the constant volume bottle 3 is clamped between the No. 2 clamping ring 27 and the receiving bracket 26. A torsion spring 272 is sleeved on the No. 1 rotating shaft 273, which can generate elastic potential energy when the No. 2 clamping ring 27 is deflected, and then the No. 2 clamping ring 27 is driven to reset under the elastic potential energy of the torsion spring 272, and the No. 1 rotating shaft 273 is provided. The fixed shaft on one side of 26 corresponds to the connecting shaft 231, and the end of the connecting shaft 231 can be clamped on the end of the fixed shaft. The threaded sleeve 25 can increase the connection tightness between the connecting shaft 231 and the fixed shaft; the No. 1 clamping ring 262 movably connected in the middle of the receiving bracket 26 has a relatively simple structure and can be rotated to one side of the receiving bracket 26 under manual rotation and clamped in the clamping groove 263, wherein the spring 242 clamping block is movably connected on the upper and lower surfaces of the clamping groove 263, and the upper and lower surfaces of the No. 2 clamping ring 27 are correspondingly provided with grooves for connecting the spring 242 buckle.

[0051] As an embodiment of the present invention, a movable groove 274 is opened in the No. 2 retaining ring 27, and the end of the No. 2 retaining ring 27 is rotatably connected to the No. 2 rotating shaft 275; an adjusting plate 276 is rotatably connected to the No. 2 rotating shaft 275, and the adjusting plate 276 is movably connected in the movable groove 274.

[0052] Specifically, a movable groove 274 is provided in the No. 2 clamping ring 27. When the constant volume bottle 3 contacts the No. 2 clamping ring 27, the adjusting piece 276 will be squeezed and the adjusting piece 276 will be rotated on the No. 2 clamping ring 27 until the constant volume bottle 3 is completely clamped in the receiving bracket 26. At this time, the adjusting piece 276 rotated into the No. 2 clamping ring 27 can be squeezed by the constant volume bottle 3 again, and the other end thereof is rotated to the opening of the two groups of No. 2 clamping rings 27, thereby achieving a further limiting effect on the constant volume bottle 3.

[0053] Working principle: when testing the solution for its effect on absorption and preservation of hydrogen sulfide in the atmosphere, a large amount of the solution needs to be prepared, and when preparing the solution, the mixed solution needs to be fixed to volume. The traditional method of fixing the volume needs to manually shake the fixing bottle 3 after the fixing is completed, so that the solution in the fixing bottle 3 is mixed. Since a large amount of the solution needs to be prepared, it needs to be shaken after preparation to mix it. This step will cause arm pain in the experimenter, which is not conducive to routine experiments. In this scheme, an auxiliary mechanism is used, and the slide rail 11 is used to slide with the receiving bracket 26. The gear 23 in the shell 2 is used to drive the receiving bracket 26 to swing back and forth in the slide rail 11, so as to achieve mixing of the solution in the fixing bottle 3, wherein a connecting shaft 231 fixed to one end of the gear 23 protrudes from the shell 2 and is used to connect the receiving bracket 26;

[0054] A through hole 211 is provided at the top of the housing 2. When the rack 24 inside the housing 2 is lifted by manpower, the rack 24 slides in the slide groove 212 using a handle 243 on one side thereof. At the same time, during the sliding process, the rack 24 meshes with the gear 23 and drives the gear 23 to rotate. When the gear 23 rotates, the receiving bracket 26 is driven to swing through the connecting shaft 231. Since the stroke of the rack 24 is limited, when the rack 24 moves to the end in one direction, the receiving bracket 26 can be driven to swing to the top of one end of the slide rail 11. Then, the rack 24 moves in the reverse direction, and drives the receiving bracket 26 to slide in the reverse direction in the slide rail 11. When the volume bottle 3 is being fixed, the rack 24 can be repeatedly driven to move up and down in the shell 2, and then the receiving bracket 26 can be driven to swing back and forth left and right in the slide rail 11, wherein a straight rod 241 fixed on a group of racks 24, the top of which passes through the shell 2, and a spring 242 is sleeved on the straight rod 241. When the rack 24 moves to the top of the shell 2, the spring 242 will be squeezed and compressed to generate elastic potential energy. The elastic potential energy generated by the compression of the spring 242 can be used to drive the rack 24 to move in the opposite direction when it moves to the top, thereby achieving the reciprocating motion effect of the receiving bracket 26.

[0055] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0056] The above shows and describes 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, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A method for preparing a solution for collecting and storing hydrogen sulfide, characterized in that: The composition of the solution is as follows: Triethanolamine; Disodium EDTA; Sodium hydroxide; Deionized water; Wherein, the preparation method of the solution comprises the following steps: Step S1: 15 ml of triethanolamine, 4 g of sodium hydroxide and 4 g of disodium ethylenediaminetetraacetate were dissolved in deionized water and the volume was fixed to 1 liter, which was used as sample 1; Step S2: 15 mL of triethanolamine, 4 g of sodium hydroxide, 4 g of disodium ethylenediaminetetraacetate and 1 g of zinc acetate were dissolved in ultrapure water and the volume was fixed to 1 L, which was used as sample 2; In the steps S1 and S2, when preparing the solution, it is necessary to mix the components of the solution and adjust the volume, wherein after the volume adjustment is completed, it is necessary to use an auxiliary mechanism to shake the volume adjustment bottle (3) so that the solution in the volume adjustment bottle (3) is evenly mixed; the auxiliary mechanism comprises a base (1); a slide rail (11) is fixedly connected to one side of the base (1), and a No. 1 connecting seat (12) is fixedly connected to the top of the base (1); a receiving bracket (26) is slidably connected to the inside of the slide rail (11), and a sliding bracket (26) is fixedly connected to the side of the receiving bracket (26) close to the slide rail (11); The slider (261) is slidably connected in the slide rail (11); the constant volume bottle (3) is clamped in the receiving bracket (26); the top of the No. 1 connecting seat (12) is fixedly connected to the shell (2), and the center position inside the shell (2) is rotatably connected to a gear (23); the gear (23) is fixedly connected to a connecting shaft (231) at one end facing the receiving bracket (26), and the connecting shaft (231) passes through the shell (2); the end of the connecting shaft (231) that passes through the outside of the shell (2) is clamped on the receiving bracket (26); The shell (2) is provided with a through hole (211) at the top, and two groups of slide grooves (212) are provided on the side wall of one end of the shell (2) away from the receiving bracket (26) and are symmetrically arranged in the upper and lower centers; two groups of racks (24) are slidably connected in the slide grooves (212), and the two groups of racks (24) are symmetrically arranged in the center; the two groups of racks (24) are meshed and connected to the gear (23); handles (243) are fixedly connected to the side walls of the two groups of racks (24), and the handles (243) pass through the slide grooves (212) and are located outside the shell (2); a straight rod (241) is fixedly connected to the top of one group of racks (24), and the straight rod (241) passes through the through hole (211); a spring (242) is sleeved on the straight rod (241), and the spring (242) is arranged at the part of the straight rod (241) located in the shell (2).

2. A method for preparing a solution for collecting and storing hydrogen sulfide according to claim 1, characterized in that: In step S1, sample 1 is used to store a standard solution containing hydrogen sulfide, and the sulfide can be stored for more than 10 days at room temperature of 20-25° C. without being protected from light. Then, the color development verification is performed using the methylene blue spectrophotometry method in accordance with GB11742-1989, standard method for sanitation inspection of hydrogen sulfide in the atmosphere of residential areas, and the sulfide loss rate is less than 5%.

3. A method for preparing a solution for collecting and preserving hydrogen sulfide according to claim 1, characterized in that: In the step S1, the samples 1 and 2 can be colored in a methylene blue system and a silver nitrate system after sampling and storage, so as to perform quantitative determination of the samples.

4. A method for preparing a solution for collecting and storing hydrogen sulfide according to claim 1, characterized in that: In step S2, sample 2 is prepared by adding 1 g of zinc acetate to sample 1 to enhance the complexation between sample 1 and sulfide ions; sample 2 is colored using a methylene blue system, and the color stability time after color development is greater than 2 days.

5. A method for preparing a solution for collecting and storing hydrogen sulfide according to claim 1, characterized in that: In step S2, when processing the biological material sample, after protein is precipitated with zinc acetate, sample 1 in step S1 is used for collection and detection.

6. A method for preparing a solution for collecting and storing hydrogen sulfide according to claim 1, characterized in that: The top two ends of the No. 1 connecting seat (12) are fixedly connected with screw rods (13); the bottom of the housing (2) is fixedly connected with a No. 2 connecting seat (22) corresponding to the No. 1 connecting seat (12), and the screw rod (13) passes through the two ends of the No. 2 connecting seat (22).

7. A method for preparing a solution for collecting and storing hydrogen sulfide according to claim 6, characterized in that: A first rotating shaft (273) is fixedly connected to the top of the receiving bracket (26), and a second retaining ring (27) is sleeved on the first rotating shaft (273); a fixing ring (271) is fixedly connected to the top of the first rotating shaft (273); a torsion spring (272) is sleeved on the first rotating shaft (273), and two ends of the torsion spring (272) are respectively fixedly connected to the fixing ring (271) and the second retaining ring (27); a fixed shaft is fixedly connected to the side of the receiving bracket (26) facing the housing (2), and the The fixed shaft and the connecting shaft (231) are coaxial; the fixed shaft and the connecting shaft (231) are both provided with threads, and the fixed shaft and the connecting shaft (231) are threadedly connected to the outer sides with threaded sleeves (25); a first clamping ring (262) is movably connected to the middle of the receiving bracket (26); a clamping groove (263) is provided on the side wall of the receiving bracket (26) corresponding to the first clamping ring (262); and the end of the first clamping ring (262) is slidably clamped in the clamping groove (263).

8. A method for preparing a solution for collecting and storing hydrogen sulfide according to claim 7, characterized in that: A movable groove (274) is provided in the second clamping ring (27), and the end of the second clamping ring (27) is rotatably connected to a second rotating shaft (275); an adjusting piece (276) is rotatably connected to the second rotating shaft (275), and the adjusting piece (276) is movably connected in the movable groove (274).

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