Method for detecting and analyzing content of silver ions in rainfall after artificial influence weather operation

Abstract

The invention relates to a method for detecting and analyzing the content of silver ions in rainfall after weather modification. The detection method comprises the following steps: collecting rainfall after artificial influence weather operation as a to-be-detected sample, preparing a series of standard solutions and an internal standard solution of Ag, digesting the to-be-detected sample, setting working parameters of ICP-MS (Inductively Coupled Plasma Mass Spectrometry), carrying out on-machine detection, and establishing a regression equation of silver ions according to ICP-MS detection values obtained by detecting the series of standard solutions. And substituting the ICP-MS detection value of a to-be-detected sample into the regression equation to obtain the silver ion concentration of the to-be-detected sample. The silver ion content detection provided by the invention adopts inductively coupled plasma mass spectrometry, the method has the advantages of high detection speed, low detection limit, high detection precision and the like, and the analysis method of the silver ion content comprises analysis of silver ion content distribution characteristics and analysis of influence on the ecological environment. The method provides basic support for green and sustainable development of artificial weather work.

Description

Technical Field

[0001] The invention relates to a method for detecting and analyzing the content of silver ions in precipitation after artificial weather influencing operations, and belongs to the technical field of detection. Background Art

[0002] Artificial weather modification catalysts include refrigerants, hygroscopic catalysts and ice-forming agents. Refrigerants mainly include quick-acting refrigerants such as dry ice (solid carbon dioxide), liquid carbon dioxide and liquid nitrogen. After being spread, this type of catalyst quickly turns into carbon dioxide gas and nitrogen gas, which are components of the air and will not pollute the ecological environment. Hygroscopic catalysts are mainly substances such as sodium chloride, urea and ammonium nitrate, which are highly hygroscopic and corrosive, and can cause soil salinization and crop damage. However, the current amount of hygroscopic catalysts used is extremely small, and the impact on the environment can be ignored. Silver iodide (AgI), as a type of ice-forming agent, is the best artificial ice nucleus material discovered so far, and is also the most widely used catalyst in current artificial weather modification field experiments and operational operations. The iodine (I) in AgI is a food nutrient required by humans, but silver ions (Ag + ) is a heavy metal with certain toxicity. As the scale of existing artificial weather modification operations continues to expand, the impact of AgI catalysts on the ecological environment and human body has attracted widespread attention. + ) content and analyzing the possible impact of AgI catalyst on the ecological environment of the Qinghai-Tibet Plateau are the premise and basis for the sustainable development of artificial weather modification work. It is of great significance to better play the role of meteorological disaster prevention and mitigation as the first line of defense and enable the high-quality development of artificial weather modification work.

[0003] As early as the 1960s, the international community began to study the environmental impact of artificial weather modification by spreading AgI. Researchers detected silver ions (Ag + ) content, and the AgI content in soil, lakes and rivers, combined with theoretical calculations, to analyze its possible impact on the environment. + ) content, and detect the silver ion (Ag + ) content, and analyze the possible impact of AgI catalysis on the environment. For example, Chen Lishu et al. used atomic absorption and flame emission spectrophotometry to determine the silver ion (AgI) content in rainwater in Hunan Province. + ) content (Chen Lishu, Wang Daofan. Statistical analysis of the silver content in rainwater in the artificial rainfall enhancement experimental area of ​​Hunan Province from 1978 to 1980 [J]. Acta Meteorologica Sinica, 1983(04):117-123.) Zeng Guangping et al. used graphite furnace atomic absorption spectrometry to determine the silver ion (Ag) content in artificial rainfall enhancement precipitation in Gutian Reservoir, Fujian Province. +) content (Zeng Guangping. Silver ions (Ag) in rainwater from artificial rainfall experiment in Gutian Reservoir, Fujian Province + ) distribution [J]. Tropical Meteorology, 1989(1):63-71). Zhao Xifang et al. used atomic absorption spectrometry to determine the effect of artificial rainfall on silver ions (Ag) in water quality in Miyun Reservoir. + ) (Zhao Xifang, Zhang Qiang, Qin Changxue, Zhao Shuyan. Research on the impact of artificial rainfall on silver ions (Ag+) in the water quality of Miyun Reservoir [J]. Meteorology, 2006, 32(5):46-51; Zhao Xifang, Zhang Qiang, Zhao Shuyan. Research on the impact of artificial rainfall on Ag and other chemical components in Miyun Reservoir [J]. Meteorological Science and Technology, 2008, 36(4):468-473).

[0004] The current "Groundwater Quality Standard" (GB T / 14848-2017) and "Drinking Water Quality Standard" (GB5749-2022) have specific requirements for silver ions (Ag + ) content has clear requirements, that is, the silver ion (Ag + ) content does not exceed 50μg / L, which is consistent with the drinking water standard set by the World Health Organization. The above studies were earlier and all used graphite furnace atomic absorption spectrometry to determine the silver ion (Ag + ) content, the working efficiency is low and the detection limit is high, and the detection limit is difficult to reach the silver ion (Ag + ) content requirements.

[0005] Inductively coupled plasma-mass spectrometry (ICP-MS) is an inorganic trace and ultra-trace element analysis and testing technology developed in the 1980s. It has the advantages of fast analysis speed, wide dynamic linear range, high sensitivity, and the ability to rapidly determine multiple elements simultaneously. However, due to technical limitations, there is currently no method for the determination of silver ions (Ag) in artificial rainfall. + ) content in precipitation after artificial rainfall enhancement operations. + ) content analysis method reported. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] In order to solve the problem that the existing technology for detecting silver has low working efficiency and high detection limit, the present invention provides a method for detecting silver ions (Ag) in precipitation after artificial weather modification. + ) content by ICP-MS detection method and analysis method.

[0008] (II) Technical solution

[0009] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0010] A method for determining the silver ions (Ag) in precipitation after artificial weather modification operations + ) content, which comprises the following steps:

[0011] S1. Collect precipitation after artificial weather modification operations as samples to be tested;

[0012] S2, prepare Ag mother solution with a concentration of 500-1000 mg / L; prepare Ag mother solution with a concentration of 10 mg / L 6 Li, 45 Sc, 72 Ge, 89 Y. 115 In, 159 Tb, 209 Bi mixed internal standard stock solution;

[0013] S3, digesting the sample to be tested, and processing it into a solution to be tested after digestion;

[0014] S4. Prepare a series of standard solutions; starting from 500-1000 mg / L Ag standard mother solution, gradually dilute and prepare a series of standard solutions with known gradient concentrations;

[0015] S5, diluting the mixed internal standard mother solution into an injection internal standard solution in which the concentration of each metal element is 1 μg / mL;

[0016] S6. Under the set ICP-MS working parameters, the internal standard solution and a series of standard solutions with gradient concentrations are mixed and sampled online for detection to obtain the ICP-MS detection values ​​of the series of standard solutions; the internal standard solution and the solution to be tested are mixed and sampled online for detection to obtain the ICP-MS detection value of the sample to be tested;

[0017] S7. Based on the ICP-MS detection values ​​obtained for the series of standard solutions, a regression equation for silver ions is established. The ICP-MS detection values ​​of the samples to be tested are substituted into the regression equation to obtain the silver ion concentration of the samples to be tested.

[0018] As described above, preferably, in step S1, in the process of collecting precipitation after artificial weather modification operations, firstly, according to the high-resolution artificial weather modification model system HR-WMM, a diffusion simulation of the silver iodide catalyst after artificial rain or snow by aircraft, artificial rain or snow on the ground, or artificial hail prevention operations on the ground is carried out in the key study area, and according to the diffusion path and diffusion area of ​​the silver iodide catalyst, ground precipitation sampling points are set in combination with the terrain characteristics; and rainwater samples from the beginning to the end of precipitation at the sampling points are collected as samples to be tested.

[0019] Furthermore, the setting of sampling points follows the following principles: the sampling points are set in the silver iodide catalyst diffusion zone; the sampling points are arranged in sequence from high to low along the catalyst diffusion concentration, and the spacing is as equal or close as possible according to the terrain characteristics; the sampling points are increased in the high-value catalyst concentration area, and the sampling points are reduced accordingly in the low-value area; the sampling points should avoid uninhabited areas, glacier areas and dangerous areas to ensure the safety of sampling personnel; the collection and transportation of the precipitation are all carried out using polyethylene containers and tools.

[0020] As described above, preferably, in step S3, the digestion of the sample to be tested is carried out in a microwave digestion instrument, and the parameters are set as follows: under a pressure of 800-1000W, the ramp time is 3-8 minutes, and the holding time is 3-8 minutes; under a pressure of 1400-1500W, the ramp time is 3-8 minutes, and the holding time is 15-25 minutes; the cooling process is under a pressure of 0W, and the holding time is 10-20 minutes.

[0021] In the method as described above, preferably, the test solution, the series of standard solutions and the injection internal standard solution are all obtained by diluting nitric acid with a mass concentration of 3-10%.

[0022] In the method as described above, preferably, in step S4, the concentrations of Ag in the series of standard solutions are 0, 2, 5, 10, 30, 60, 80, 100 mg / L, respectively.

[0023] In the above method, preferably, in step S6, the ICP-MS on-machine detection includes first adding 6 Li, 45 Sc, 72 Ge, 89 Y. 115 In, 159 Tb, 209 A mixed internal standard solution of Bi is prepared, and then under the set ICP-MS working conditions, the internal standard solution, a series of standard solutions and the solution to be tested are injected, and the ICP-MS detection values ​​are obtained respectively and the silver ion content of the solution to be tested is calculated.

[0024] In the method as described above, preferably, the ICP-MS operating condition parameters are: RF power of 1500 W, RF voltage of 1.67 V, nebulizer chamber temperature of 2°C, sampling depth of 8.1 mm, carrier gas flow rate of 0.85 L / min, compensation gas flow rate of 0.21 L / min, and peristaltic pump rate of 0.1 rps.

[0025] A method for analyzing the silver ion content in precipitation after artificial weather modification operations, comprising the following steps:

[0026] 1) The detection data of the samples to be tested obtained by the above detection method are divided into three categories: sample data after artificial rain / snow enhancement by aircraft, sample data after artificial rain / snow enhancement by ground, and sample data after artificial hail prevention by ground. Combined with GIS maps, the distribution characteristics of silver ion content in precipitation under different operation modes are analyzed respectively;

[0027] 2) Analyze the impact of silver ion content on the ecological environment.

[0028] In a preferred embodiment, in step 2), when the silver ion content in the test results is lower than 50 μg / L, it indicates that the artificial weather modification operation has no impact on the ecological environment; when the silver ion content in the test results is higher than 50 μg / L, the artificial weather modification operation should be suspended first to analyze whether the test result is caused by the artificial weather modification operation.

[0029] (III) Beneficial effects

[0030] The beneficial effects of the present invention are:

[0031] The invention provides a method for preparing a precipitation silver ion (Ag + ) content. Firstly, before sample collection, a high-resolution weather modification model system is used to carry out diffusion simulation to determine the sampling points, which greatly reduces the workload while ensuring scientificity. Secondly, the ICP-MS method is applied to the field of weather modification for the first time, with the characteristics of fast detection speed, low detection limit, high detection precision and accurate detection.

[0032] The present invention also provides a method for preparing a precipitation silver ion (Ag + ) content, including silver ions (Ag + ) content distribution characteristics and its impact on the ecological environment, providing basic support for the green and sustainable development of artificial weather modification work. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Distribution map of the diffusion paths and diffusion zones of silver iodide catalysts simulated for a high-resolution weather modification model. DETAILED DESCRIPTION

[0035] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation methods. Unless otherwise specified, the technical means used below are conventional means well known to those skilled in the art.

[0036] The precipitation described in the present invention is ground precipitation collected after carrying out artificial weather modification operations. Before collecting ground precipitation, based on the high-resolution artificial weather modification model system (HR-WMM), silver iodide catalyst diffusion simulation is carried out after artificial rain (snow) enhancement by aircraft, artificial rain (snow) enhancement on the ground, or artificial hail prevention operations on the ground in the key research area. According to the diffusion path and diffusion area of ​​the silver iodide catalyst, combined with the terrain characteristics, the ground precipitation sampling points are scientifically set, so that the sampling not only ensures the scientificity and representativeness of the precipitation sampling, but also reduces the workload of precipitation sampling.

[0037] All samples are collected using polyethylene containers and tools to avoid heavy metal contamination. After sampling, the samples should be sent for testing immediately.

[0038] Example 1

[0039] Silver ions (Ag) in precipitation after artificial weather modification operations + ) content, comprising the following steps:

[0040] 1. Precipitation collection for weather modification operations;

[0041] 2. Instruments and reagents;

[0042] 3. Sample digestion;

[0043] 4. Preparation of standard solution;

[0044] 5. Preparation of internal standard solution;

[0045] 6.ICP-MS on-machine testing.

[0046] The specific steps are:

[0047] 1. Precipitation collection for weather modification operations

[0048] Carry out artificial weather modification operations, including artificial rain (snow) enhancement by aircraft, artificial rain (snow) enhancement by ground rockets / smoke stoves, and artificial hail prevention operations by ground anti-aircraft guns. Afterwards, use the diffusion simulation method to collect rainwater samples from the beginning to the end of precipitation in the operation area and the affected area after the operation. The precipitation sampling volume is 100-500ml. In order to avoid heavy metal pollution, polyethylene containers and tools are used for precipitation collection and transportation. After the sampling is completed, it is sent to the testing center in time. The diffusion simulation method used is based on the high-resolution artificial weather modification model system (HR-WMM). This system is an artificial weather modification model system that takes into account multiple factors such as local terrain and weather systems. It uses the SJY-FDDA four-dimensional data assimilation technology, is based on the WRF-ARW dynamic architecture, and is nested with the WRF-LES large eddy model. It has the ability to quantitatively predict cloud physics, microphysical response of catalytic effects, and catalyst diffusion, transport and nucleation simulation. It has good weather system simulation capabilities and artificial weather modification catalytic simulation capabilities. It is a specific diffusion simulation method. Specifically, the high-resolution weather modification model system (HR-WMM) uses the GFS (Global Forecast System, GFS for short, a global numerical weather forecast model developed and operated by the National Centers for Environmental Prediction of the United States) or EC (European Centre for Medium-Range Weather Forecasts, EC for short) forecast data as the initial field, sets the output spatial resolution to be no less than 3 km, and the grid spacings to be 15 km, 3 km, and 1 km respectively. It uses the 5th-order horizontal advection scheme, the 3rd-order vertical advection scheme, the 2D-Smagorinsky horizontal diffusion scheme, the Smoothing-desmoothing spatial smoothing scheme, the Noah-MP ground layer scheme, the YSU atmospheric boundary layer scheme, the RRTM atmospheric longwave radiation scheme, the Thompson cloud microphysics parameterization scheme, the 3rd-order Runge-Kutta integration scheme, and the Kain-Fritch cumulus parameterization scheme. The meteorological and cloud field data with a forecast time of 48 hours include temperature, humidity, air pressure, wind speed, wind direction, vertical airflow velocity, water vapor, cloud water, ice crystals, rain, snow balls and water content of hail particles, etc. At the same time, the model system covers the sublimation nucleation and contact freezing nucleation process of artificial weather modification catalysts (AgI particles), the advection transport and diffusion process of AgI particle number concentration, the removal process of AgI particles through sublimation nucleation, contact freezing nucleation and other dry and wet deposition loss mechanisms, and can more accurately simulate the diffusion path and main impact area of ​​artificial catalysts under complex plateau terrain.

[0049] According to the silver iodide catalyst diffusion path and diffusion area obtained by the high-resolution artificial weather modification model simulation system, ground precipitation sampling points are set in combination with terrain characteristics. The sampling points are arranged in accordance with the following principles: 1. Most sampling points should be arranged in the catalyst diffusion area, and a small number of sampling points can be arranged outside the diffusion area to verify the accuracy of the model simulation. 2. The sampling points are arranged in sequence from high to low along the catalyst diffusion concentration, and the spacing should be as equal or close as possible according to the terrain characteristics. 3. The number of sampling points should be appropriately increased in areas with high catalyst concentrations, and the number of sampling points can be reduced accordingly in areas with low catalyst concentrations; e.g. Figure 1 The figure shows the distribution map of the diffusion path and diffusion area of ​​the silver iodide catalyst obtained after the ground smoke stove operation simulated by the high-resolution artificial weather modification model, where the red area is the high-value area and the yellow area is the low-value area. However, each simulation will be different due to different operation methods (aircraft operation, rocket operation, smoke stove operation) and different catalyst dosages. As shown in the figure, more sampling points can be set as needed in the high-value area, and fewer sampling points can be set in the low-value area. 4. According to the terrain characteristics, the sampling points should avoid dangerous areas such as uninhabited areas and glacier areas to ensure the safety of the sampling personnel.

[0050] The sampling of precipitation after artificial weather modification operations is carried out in the field, and sampling personnel, sampling equipment, sample transportation, etc. all require huge manpower and material resources. At the same time, since silver ions in precipitation are trace substances, the detection fee of silver ions is expensive. Model simulation can scientifically and reasonably arrange sampling points on the basis of ensuring the representativeness of sampling points, which can not only ensure the representativeness and scientificity of sampling points, without missing important areas, but also avoid the loss of personnel and funds caused by blindly arranging sampling points.

[0051] Without high-precision model simulation results, in order to ensure the accuracy of sampling, a lot of manpower and material resources will be needed to carry out precipitation sampling, which will not only cause financial losses, but also fail to guarantee personnel safety. At the same time, large-scale sampling requires support from multiple departments and funds, which is difficult for general units to carry out. In addition, even if sampling is carried out, many sampling data will not be representative or have high repetitiveness, resulting in a low input-output ratio and the implementation of the project will not be sustainable.

[0052] 2. Instruments and Reagents

[0053] Instruments: Inductively coupled plasma mass spectrometer (ICP-MS) (Agilent, USA), microwave digestion instrument, ultrapure water treatment system (Millipore, USA) or use purchased ultrapure water to ensure that its resistivity is greater than 18MΩ·cm, total organic carbon (TOC) is less than 50μg / L, and total bacterial count is less than 1CFU / mL.

[0054] Reagents: Ag standard solution with a concentration of 1000 mg / L; 6 Li,45 Sc, 72 Ge, 89 Y. 115 In, 159 Tb, 209 Bi mixed internal standard solution (available from Agilent, USA).

[0055] 3. Sample digestion

[0056] 1 ml of the water sample to be tested was taken and placed in a polytetrafluoroethylene (PTFE) digestion tank, 5 ml of nitric acid with a mass concentration of 5% was added, the tank was sealed with a cover, and microwave digestion was performed. The microwave digestion parameters are shown in Table 1, that is, under a pressure of 800 W, the ramp time was 5 minutes and the holding time was 5 minutes; under a pressure of 1400 W, the ramp time was 5 minutes and the holding time was 20 minutes; the cooling process was under a pressure of 0 W and the holding time was 15 minutes.

[0057] After digestion is completed, place the digestion tank on a constant temperature heating digester, slowly heat it at 200 degrees Celsius until the reddish-brown steam is completely evaporated, and continue to concentrate to about 0.5ml and then cool. Transfer the sample to a clean test tube, dilute it to 10ml with 5% dilute nitric acid and shake it well.

[0058] The blank control sample was configured the same as above.

[0059] Table 1 Microwave digestion parameters

[0060] Pressure(Watt) Climbing time (minutes) Holding time (minutes) 800 5 5 1400 5 20 0 0 15

[0061] 4. Preparation of standard solution

[0062] Pipette an appropriate amount of 1000 mg / L Ag standard solution and dilute it with 5% nitric acid to concentrations of 0, 2, 5, 10, 30, 60, 80, 100 mg / L.

[0063] 5. Preparation of internal standard solution

[0064] Absorbed concentration of 10mg / L 6 Li, 45 Sc, 72 Ge, 89 Y. 115 In, 159 Tb, 209 An appropriate amount of Bi mixed internal standard solution was diluted with 5% nitric acid to an internal standard solution of 1 μg / ml.

[0065] 6.ICP-MS on-machine testing

[0066] Join Online 6 Li, 45 Sc, 72 Ge,89 Y. 115 In, 159 Tb, 209 The mixed internal standard solution of Bi was detected by inductively coupled plasma mass spectrometry (ICP-MS). The ICP-MS working conditions are shown in Table 2. The internal standard solution, standard solution and sample solution were injected according to the ICP-MS working conditions to detect the content of silver element.

[0067] Table 2 Inductively coupled plasma mass spectrometer (ICP-MS) operating parameters

[0068] ICP-MS parameters value RF power 1500W RF matching 1.67V Spray chamber temperature (S / C temperature) 2℃ Sample Depth 8.1mm Carrier gas flow rate 0.85L / min Makeup gas flow rate 0.21L / min Nebulizer Pump flow rate 0.1rps

[0069] 7. Linear Relationship and Detection Limit

[0070] Before each sample is measured, the system is flushed with nitric acid solution until the signal is at its lowest. After the analytical signal is stable, the standard solution is sampled and analyzed to obtain the linear equation and correlation coefficient of the silver element. The blank control solution is tested and sampled 11 times continuously. The detection limit is calculated by dividing the 3 times standard deviation of the blank control solution measurement value by the slope of the corresponding element standard curve.

[0071] The regression equation of silver element is: y = 0.013x + 6.82 × 10 -4

[0072] Where y is the signal intensity and x is the concentration of the element to be measured (silver ion, mg / L).

[0073] The correlation coefficient is: 0.9998;

[0074] Detection limit: 0.001μg / L;

[0075] Relative deviation: 3%;

[0076] Precision: 0.210.

[0077] The silver ion concentration of the sample to be tested can be obtained by substituting the ICP-MS detection value of the sample to be tested into the regression equation.

[0078] The above results show that the method for detecting the silver ion (Ag+) content in precipitation after artificial weather modification operations based on inductively coupled plasma mass spectrometry (ICP-MS) established in the present invention has the characteristics of simple pretreatment, fast and accurate detection results, low detection limit and high detection accuracy.

[0079] The present invention also provides silver ions (Ag + ) content, comprising the following steps:

[0080] 1) Analysis of silver ion (Ag+) content distribution characteristics

[0081] The sample test data are divided into three categories: samples after artificial rain (snow) enhancement operations by aircraft, samples after artificial rain (snow) enhancement operations on the ground, and samples after artificial hail prevention operations on the ground. Combined with the geographic information system (GIS) map, the distribution characteristics of silver ion content in precipitation under different operation methods are analyzed respectively.

[0082] 2) Silver ion (Ag + Analysis of the impact of ) content on the ecological environment

[0083] According to the current "Groundwater Quality Standard" (GB T / 14848-2017), "Drinking Water Hygiene Standard" (GB5749-2022) and the drinking water standards stipulated by the World Health Organization, the silver content in water cannot exceed 50μg / L. The test results were compared with the above standards to conduct silver ion (Ag + ) content on the ecological environment.

[0084] If the test results show silver ions (Ag + ) contents were all lower than 50μg / L, indicating that artificial weather modification operations had no impact on the ecological environment.

[0085] If it is higher than 50μg / L, it means that the silver ion content in the precipitation in the area exceeds the standard. First, artificial weather modification operations should be suspended, and then in-depth analysis should be carried out to determine whether it is caused by artificial weather modification operations. Based on current research, the silver ion concentration in precipitation after artificial weather modification operations is 2-3 orders of magnitude lower than the standard value and will not exceed the standard.

[0086] Example 2

[0087] In 2023-2024, according to the method described in Example 1 of the present invention, precipitation sampling and silver ion (Ag) after aircraft artificial rain (snow), ground artificial rain (snow) and ground artificial hail prevention operations were carried out. + ) content detection and analysis, some of the test results are shown in Table 3.

[0088] Table 3 Partial test results

[0089]

[0090] Among them, ND means not detected.

[0091] The results show that the silver ions (Ag) in precipitation after artificial rain (snow) enhancement by aircraft, artificial rain (snow) enhancement by ground and artificial hail prevention by ground are +) content did not exceed my country's current "Groundwater Quality Standard" (GB T / 14848-2017), "Drinking Water Quality Standard" (GB 5749-2022) and the drinking water standards stipulated by the World Health Organization, and the silver content in the water did not exceed 50μg / L.

[0092] Example 3 Precision Experiment

[0093] The precipitation samples collected at the same time at the same collection point under the same weather process were divided into 10 parts, and the sample pretreatment was carried out according to the method of Example 1 of the present invention, and the analysis was carried out under the same microwave digestion and ICP-MS working conditions, and the average concentration and relative standard deviation (RSD) of silver ions were calculated. The results showed that the average concentration of silver ions was 0.85 μg / L, and the relative standard deviation (RSD) was 0.3%.

[0094] The method of the present invention introduces the ICP-MS method into the field of artificial weather modification, and carries out the detection of silver ions in precipitation after artificial weather modification operations under different operation methods, thereby laying a foundation for the study of the catalytic operation effect of artificial weather modification and the impact on the ecological environment, and supporting the sustainable development of artificial weather modification science.

[0095] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any person skilled in the art can use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims

1. An ICP-MS detection method for the silver ion content in precipitation after artificial weather modification operations, characterized in that: It includes the following steps: S1. Collecting precipitation after artificial weather modification operations as samples to be tested; S2. Prepare a standard Ag stock solution with a concentration of 500-1000 mg / L; Prepare the concentration of 10 mg / L 6 Li, 45 Sc, 72 Ge, 89 Y. 115 In, 159 Tb, 209 Bi mixed internal standard stock solution; S3, digesting the sample to be tested, and processing it into a solution to be tested after digestion; S4. Prepare a series of standard solutions; starting from 500-1000 mg / L Ag standard mother solution, gradually dilute and prepare a series of standard solutions with known gradient concentrations; S5, diluting the mixed internal standard mother solution into an injection internal standard solution in which the concentration of each metal element is 1 μg / mL; S6. Under the set ICP-MS working parameters, the internal standard solution and a series of standard solutions with gradient concentrations are mixed and injected online for detection to obtain ICP-MS detection values ​​obtained by the series of standard solutions; The internal standard solution and the solution to be tested are mixed online for sampling and testing to obtain the ICP-MS detection value of the sample to be tested; S7. Based on the ICP-MS detection values ​​obtained for the series of standard solutions and establishing a regression equation for silver ions, the ICP-MS detection values ​​of the sample to be tested are substituted into the regression equation to obtain the silver ion concentration of the sample to be tested.

2. The detection method according to claim 1, characterized in that In step S1, in the process of collecting precipitation after artificial weather modification operations, first, based on the high-resolution artificial weather modification model system, a diffusion simulation of the silver iodide catalyst after artificial rain or snow by aircraft, artificial rain or snow on the ground, or artificial hail prevention operations on the ground in the key study area is carried out, and ground precipitation sampling points are set according to the diffusion path and diffusion area of ​​the silver iodide catalyst in combination with the terrain characteristics; rainwater samples from the beginning to the end of precipitation at the sampling points are collected as samples to be tested.

3. The detection method according to claim 2, characterized in that The setting of sampling points follows the following principles: the sampling points are set in the diffusion zone of the silver iodide catalyst; the sampling points are arranged in order from high to low along the diffusion concentration of the catalyst, and the spacing is as equal or close as possible according to the terrain characteristics; the sampling points are increased in the area with high silver iodide catalyst concentration, and the sampling points are reduced accordingly in the area with low concentration; the sampling points should avoid uninhabited areas, glacier areas and dangerous areas to ensure the safety of the sampling personnel; The collection and transportation of precipitation are both carried out using polyethylene containers and tools.

4. The detection method according to claim 1, characterized in that In step S3, the digestion of the sample to be tested is carried out in a microwave digestion instrument, and the parameters are set as follows: under a pressure of 800-1000W, the ramp time is 3-8 minutes, and the holding time is 3-8 minutes; under a pressure of 1400-1500W, the ramp time is 3-8 minutes, and the holding time is 15-25 minutes; the cooling process is under a pressure of 0W, and the holding time is 10-20 minutes.

5. The detection method according to claim 1, characterized in that The test solution, the series standard solution and the injection internal standard solution are all obtained by diluting nitric acid with a mass concentration of 3-10%.

6. The detection method according to claim 1, characterized in that In step S4, the concentrations of Ag in the series of standard solutions are 0, 2, 5, 10, 30, 60, 80, and 100 mg / L, respectively.

7. The detection method according to claim 1, characterized in that In step S6, the ICP-MS on-machine detection includes first adding 6 Li, 45 Sc, 72 Ge, 89 Y. 115 In, 159 Tb, 209 A mixed internal standard solution of Bi is prepared, and then under the set ICP-MS working conditions, the internal standard solution, a series of standard solutions and the solution to be tested are injected, and the ICP-MS detection values ​​are obtained respectively and the silver ion content of the solution to be tested is calculated.

8. The detection method according to claim 1, characterized in that The ICP-MS working condition parameters are as follows: RF power of 1500 W, RF voltage of 1.67 V, atomization chamber temperature of 2° C., sampling depth of 8.1 mm, carrier gas flow rate of 0.85 L / min, compensation gas flow rate of 0.21 L / min, and peristaltic pump rate of 0.1 rps.

9. A method for analyzing the silver ion content in precipitation after artificial weather modification operations, characterized in that: It includes the following steps: 1) obtaining the test data of the sample to be tested according to the detection method described in any one of claims 1 to 8, and dividing the test data into three categories: sample data after artificial rain / snow enhancement by aircraft, sample data after artificial rain / snow enhancement by ground, and sample data after artificial hail prevention by ground, and analyzing the distribution characteristics of silver ion content in precipitation under different operation modes in combination with GIS maps; 2) Analyze the impact of silver ion content on the ecological environment.

10. The analysis method according to claim 9, characterized in that In step 2), when the silver ion content in the test results is lower than 50μg / L, it indicates that the artificial weather modification operation has no impact on the ecological environment; when the silver ion content in the test results is higher than 50μg / L, the artificial weather modification operation should be suspended first to analyze whether the test result is caused by the artificial weather modification operation.

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