Method for detecting silver element in magnesium-silver alloy
By optimizing the detection conditions of flame atomic absorption spectrometry, the detection range of silver in magnesium-silver alloys was expanded, solving the problems of limited detection range and insufficient accuracy in existing technologies, and achieving detection results with high sensitivity and high accuracy.
Patent Information
- Application Number
- CN202511954529.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-23
- Publication Date
- 2026-03-03
AI Technical Summary
Existing flame atomic absorption spectrometry cannot meet the detection requirements of low silver content in novel magnesium-silver alloys, and it suffers from limited detection range and insufficient accuracy.
By preparing a series of standard solutions and sample solutions, and combining them with flame atomic absorption spectrometry, the detection conditions are optimized, the detection range is expanded, and the accuracy is improved, making it suitable for the detection of silver in various novel magnesium-silver alloys.
It achieves highly sensitive detection of silver in magnesium-silver alloys, with the detection range expanded to 0.020 μg/mL. It is easy to operate, suitable for batch sample testing, and has high accuracy, meeting the detection needs of novel magnesium-silver alloys.
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Abstract
Description
Technical Field
[0001] This invention belongs to the field of metal material testing technology, specifically relating to a method for detecting silver in magnesium-silver alloys. Background Technology
[0002] Silver-containing magnesium alloys, with their lightweight, high strength, and high-temperature resistance, are widely used in various high-end manufacturing fields such as aerospace, electronics, automotive, and medical. The core advantages of adding silver to magnesium alloys lie in improved mechanical properties and optimized aging response. It can significantly enhance strength and hardness at both room temperature and high temperatures. Silver forms fine, dispersed intermetallic compounds with elements such as magnesium, aluminum, and zinc, effectively hindering dislocation movement and improving the alloy's resistance to softening at high temperatures. It can accelerate and enhance the aging strengthening process. Silver promotes the nucleation and uniform precipitation of strengthening phases during aging, refines the size of precipitated phases, shortens aging time, and allows the alloy to achieve a higher peak aging strengthening value. Appropriate amounts of silver can optimize the microstructure of magnesium alloys, reduce the segregation of harmful phases at grain boundaries, lower the probability of galvanic corrosion, and significantly improve the alloy's corrosion resistance in specific media. The silver content directly affects the structure and properties of magnesium-silver alloys; therefore, accurate detection of the silver content in magnesium-silver alloys is crucial.
[0003] Currently, commonly used methods for silver detection include ICP, X-ray fluorescence spectrometry, spectrophotometry, and flame atomic absorption spectrometry. Among these, ICP is susceptible to interference from coexisting elements; X-ray fluorescence spectrometry has low sensitivity and significant matrix effects; and spectrophotometry is relatively cumbersome, requiring a colorimetric reaction beforehand. Flame atomic absorption spectrometry is widely used due to its advantages of low interference, simple procedure, and rapid detection; however, the existing national standard GB / T 13748.6-2005 specifies a silver content determination range of only 1.00%~3.00%, which cannot meet the detection requirements for low silver content in novel magnesium-silver alloys. Summary of the Invention
[0004] The present invention aims to solve the problems existing in the above-mentioned background technology, and therefore provides a method for detecting silver element in magnesium-silver alloys. The purpose is to expand the detection range and ensure the detection accuracy, so as to meet the detection needs of silver element in various new magnesium-silver alloys.
[0005] A method for detecting silver in magnesium-silver alloys, comprising the following steps:
[0006] I. Preparation of a series of standard solutions:
[0007] Transfer 0 mL, 1.00 mL, 2.00 mL, 4.00 mL, 6.00 mL, 8.00 mL, and 10.00 mL of 0.1 mg / mL silver standard solution to seven 100 mL volumetric flasks. Add 50 mL of 20 mg / mL magnesium standard solution and 4 mL of thiourea aqueous solution to each flask. Dilute to volume with deionized water and mix well to obtain standard solutions with a silver mass fraction of 0.010% to 0.100%.
[0008] Transfer 0 mL, 1.00 mL, 2.00 mL, 4.00 mL, 6.00 mL, 8.00 mL, and 10.00 mL of 0.1 mg / mL silver standard solution to seven 100 mL volumetric flasks. Add 5 mL of 20 mg / mL magnesium standard solution and 4 mL of thiourea aqueous solution to each flask. Dilute to volume with deionized water and mix well to obtain standard solutions with a silver mass fraction of 0.100%–1.00%.
[0009] Transfer 0 mL, 1.00 mL, 2.00 mL, 4.00 mL, 6.00 mL, 8.00 mL, and 10.00 mL of 0.1 mg / mL silver standard solution to seven 100 mL volumetric flasks. Add 1 mL of 20 mg / mL magnesium standard solution and 4 mL of thiourea aqueous solution to each flask. Dilute to volume with deionized water and mix well to obtain standard solutions with a silver mass fraction of 1.00%–5.00%.
[0010] The above-obtained standard solutions with silver mass fractions of 0.010% to 0.100%, 0.100% to 1.00%, and 1.00% to 5.00% constitute a series of standard solutions.
[0011] II. Preparation of sample solution:
[0012] The magnesium-silver alloy sample to be tested was processed into fragments, and 1.000g was weighed and placed in a 250mL beaker. 30mL of nitric acid solution and 3~5 drops of hydrogen peroxide were added to obtain the sample solution.
[0013] III. Preparation of test solution based on silver content:
[0014] Based on the estimated silver content of the magnesium-silver alloy sample upon arrival, three types of solutions were prepared to obtain test solution A, test solution B, or test solution C.
[0015] IV. Testing and Calculation:
[0016] The series of standard solutions obtained in step one, along with test solutions A, B, or C, are placed in a flame atomic absorption spectrometer. Under the set working conditions, absorbance is measured using an air-acetylene lean flame and zeroing with water. A working curve is plotted with silver mass concentration on the x-axis and absorbance on the y-axis. The corresponding silver concentration is found from the plotted working curve based on the absorbance of test solutions A, B, or C. The silver content in test solutions A, B, or C is calculated using the formula, thus completing the detection.
[0017] Furthermore, the concentration of the thiourea aqueous solution described in steps one and three is 50 g / L.
[0018] Furthermore, the particle size of the debris mentioned in step two is 0.5~1mm.
[0019] Furthermore, the nitric acid solution mentioned in step two is prepared by mixing concentrated nitric acid and deionized water in a volume ratio of 1:1.
[0020] Furthermore, the hydrogen peroxide mentioned in step two has a concentration of ρ = 1.10 g / mL.
[0021] Furthermore, step three involves preparation in three different scenarios, as detailed below:
[0022] When the silver mass fraction is 0.100% to 1.00%, take all the above sample solutions and transfer them into a 100 mL volumetric flask. Add 10 mL of nitric acid and 4 mL of thiourea aqueous solution, then dilute to volume with deionizer and mix well to obtain test solution A.
[0023] Alternatively, when the silver mass fraction is 1.00% to 5.00%, take all of the above sample solutions and transfer them into a 100 mL volumetric flask. Add 10 mL of test solution A and 4 mL of thiourea aqueous solution, then dilute to volume with deionizer and mix well to obtain test solution B.
[0024] Alternatively, when the silver mass fraction is 1.00% to 5.00%, take all of the above sample solutions and transfer them to a 500 mL volumetric flask. Add 10 mL of test solution A and 4 mL of thiourea aqueous solution, then dilute to volume with deionizer and mix well to obtain the test solution C.
[0025] Furthermore, in step four, the series of standard solutions are paired with test solution A, test solution B, or test solution C as follows:
[0026] A series of standard solutions with a silver mass fraction of 0.010% to 0.100% are paired with test solution A;
[0027] A series of standard solutions with a silver mass fraction of 0.100% to 1.00% are paired with test solution B;
[0028] A series of standard solutions with a silver mass fraction of 1.00% to 5.00% are used to pair with test solution C.
[0029] Furthermore, the flame atomic absorption spectrometer described in step four has a measurement range of 190 nm to 990 nm.
[0030] Furthermore, the working conditions set in step four are as follows: a flame atomic absorption spectrometer is used with a wavelength of 328.1 nm, a silver hollow cathode lamp is used as the light source, the lamp current is 2.0 mA, the burner height is 6 mm, the gas flow rate is 1200 mL / min, the compressed air pressure is 0.28 MPa, and the slit width is 0.8 nm.
[0031] Furthermore, the formula shown in step four: Silver content is expressed as silver mass fraction w Ag The value is expressed as a percentage of mass, and the formula is as follows:
[0032] ρ—The mass concentration of silver in the analytical solution, obtained from the working curve, in µg / mL.
[0033] V0—The final volume of the sample solution, in mL.
[0034] V2 — The final volume of the test solution transferred, in mL.
[0035] m — the mass of the sample, in grams.
[0036] V1 — Volume of test solution transferred, in mL.
[0037] The advantages of this invention are:
[0038] This invention optimizes and improves flame atomic absorption spectrometry, expanding the detection range and ensuring detection accuracy to meet the detection needs of silver in various novel magnesium-silver alloys.
[0039] This invention utilizes flame atomic absorption spectrometry to absorb the characteristic spectral lines emitted by a hollow cathode lamp, exhibiting high selectivity and minimal interference from coexisting elements. It boasts high sensitivity, achieving a characteristic concentration of 0.020 μg / mL for silver detection. The operation is simple and efficient; samples can be detected directly after acid dissolution, eliminating the need for complex separation steps. The instrument is highly automated, making it suitable for routine analysis of batches of magnesium alloy samples. Detailed Implementation
[0040] The technical solution of the present invention is not limited to the specific embodiments listed below, but also includes any combination of the specific embodiments.
[0041] Specific Implementation Method 1: This implementation method provides a method for detecting silver in magnesium-silver alloys, which is carried out according to the following steps:
[0042] I. Preparation of a series of standard solutions:
[0043] Transfer 0 mL, 1.00 mL, 2.00 mL, 4.00 mL, 6.00 mL, 8.00 mL, and 10.00 mL of 0.1 mg / mL silver standard solution to seven 100 mL volumetric flasks. Add 50 mL of 20 mg / mL magnesium standard solution and 4 mL of thiourea aqueous solution to each flask. Dilute to volume with deionized water and mix well to obtain standard solutions with a silver mass fraction of 0.010% to 0.100%.
[0044] Transfer 0 mL, 1.00 mL, 2.00 mL, 4.00 mL, 6.00 mL, 8.00 mL, and 10.00 mL of 0.1 mg / mL silver standard solution to seven 100 mL volumetric flasks. Add 5 mL of 20 mg / mL magnesium standard solution and 4 mL of thiourea aqueous solution to each flask. Dilute to volume with deionized water and mix well to obtain standard solutions with a silver mass fraction of 0.100%–1.00%.
[0045] Transfer 0 mL, 1.00 mL, 2.00 mL, 4.00 mL, 6.00 mL, 8.00 mL, and 10.00 mL of 0.1 mg / mL silver standard solution to seven 100 mL volumetric flasks. Add 1 mL of 20 mg / mL magnesium standard solution and 4 mL of thiourea aqueous solution to each flask. Dilute to volume with deionized water and mix well to obtain standard solutions with a silver mass fraction of 1.00%–5.00%.
[0046] The above-obtained standard solutions with silver mass fractions of 0.010% to 0.100%, 0.100% to 1.00%, and 1.00% to 5.00% constitute a series of standard solutions.
[0047] II. Preparation of sample solution:
[0048] The magnesium-silver alloy sample to be tested was processed into fragments, and 1.000g was weighed and placed in a 250mL beaker. 30mL of nitric acid solution and 3~5 drops of hydrogen peroxide were added to obtain the sample solution.
[0049] III. Preparation of test solution based on silver content:
[0050] Based on the estimated silver content of the magnesium-silver alloy sample upon arrival, three types of solutions were prepared to obtain test solution A, test solution B, or test solution C.
[0051] IV. Testing and Calculation:
[0052] The series of standard solutions obtained in step one, along with test solutions A, B, or C, are placed in a flame atomic absorption spectrometer. Under the set working conditions, absorbance is measured using an air-acetylene lean flame and zeroing with water. A working curve is plotted with silver mass concentration on the x-axis and absorbance on the y-axis. The corresponding silver concentration is found from the plotted working curve based on the absorbance of test solutions A, B, or C. The silver content in test solutions A, B, or C is calculated using the formula, thus completing the detection.
[0053] Specific Implementation Method Two: This implementation method differs from Specific Implementation Method One in that the concentration of the thiourea aqueous solution described in steps one and three is 50 g / L. Everything else is the same as in Specific Implementation Method One.
[0054] Specific Implementation Method 3: This implementation method differs from Specific Implementation Method 1 in that the particle size of the debris in step 2 is 0.5~1mm. Everything else is the same as in Specific Implementation Method 1.
[0055] Specific Implementation Method Four: This implementation method differs from Specific Implementation Method One in that the nitric acid solution mentioned in step two is prepared by mixing concentrated nitric acid and deionized water at a volume ratio of 1:1. Other steps and parameters are the same as in Specific Implementation Method One.
[0056] Specific Implementation Method Five: This implementation method differs from Specific Implementation Method One in that the hydrogen peroxide in step two has a concentration of ρ = 1.10 g / mL. All other steps and parameters are the same as in Specific Implementation Method One.
[0057] The purpose of adding hydrogen peroxide in step two of this embodiment is to aid in dissolution.
[0058] Specific Implementation Method Six: This implementation method differs from Specific Implementation Method One in that step three involves preparation in three different scenarios, as detailed below:
[0059] When the silver mass fraction is 0.100% to 1.00%, take all the above sample solutions and transfer them into a 100 mL volumetric flask. Add 10 mL of nitric acid and 4 mL of thiourea aqueous solution, then dilute to volume with deionizer and mix well to obtain test solution A.
[0060] Alternatively, when the silver mass fraction is 1.00% to 5.00%, take all of the above sample solutions and transfer them into a 100 mL volumetric flask. Add 10 mL of test solution A and 4 mL of thiourea aqueous solution, then dilute to volume with deionizer and mix well to obtain test solution B.
[0061] Alternatively, when the silver mass fraction is 1.00%–5.00%, take all of the above sample solutions and transfer them to a 500 mL volumetric flask. Add 10 mL of test solution A and 4 mL of thiourea aqueous solution, then dilute to volume with deionizer and mix well to obtain test solution C. Other steps and parameters are the same as in Specific Implementation Method 1.
[0062] Specific Implementation Method Seven: This implementation method differs from Specific Implementation Method One in that, in step four, the series of standard solutions are paired with test solution A, test solution B, or test solution C as follows:
[0063] A series of standard solutions with a silver mass fraction of 0.010% to 0.100% are paired with test solution A;
[0064] A series of standard solutions with a silver mass fraction of 0.100% to 1.00% are paired with test solution B;
[0065] A series of standard solutions with a silver mass fraction of 1.00% to 5.00% are used to neutralize the test solution C. Other steps and parameters are the same as in Specific Implementation Method 1.
[0066] Specific Implementation Method Eight: This implementation method differs from Specific Implementation Method One in that the flame atomic absorption spectrometer described in step four has a measurement range of 190nm to 990nm. Other steps and parameters are the same as in Specific Implementation Method One.
[0067] Specific Implementation Method Nine: This implementation method differs from Specific Implementation Method One in that the working conditions set in step four are as follows: a flame atomic absorption spectrometer is used with a wavelength of 328.1 nm, a silver hollow cathode lamp as the light source, a lamp current of 2.0 mA, a burner height of 6 mm, a gas flow rate of 1200 mL / min, a compressed air pressure of 0.28 MPa, and a slit width of 0.8 nm. Other steps and parameters are the same as in Specific Implementation Method One.
[0068] Specific Implementation Method Ten: This implementation method differs from Specific Implementation Method One in that the formula shown in step four is: Silver content is expressed as silver mass fraction w Ag The value is expressed as a percentage of mass, and the formula is as follows:
[0069] ρ—The mass concentration of silver in the analytical solution, obtained from the working curve, in µg / mL.
[0070] V0—The final volume of the sample solution, in mL.
[0071] V2 — The final volume of the test solution transferred, in mL.
[0072] m — the mass of the sample, in grams.
[0073] V1 – Volume of test solution transferred, in mL. Other steps and parameters are the same as in Specific Implementation Method 1.
[0074] The beneficial effects of the present invention are verified through the following embodiments:
[0075] The following description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
[0076] Example:
[0077] A method for detecting silver in magnesium-silver alloys, comprising the following steps:
[0078] I. Preparation of a series of standard solutions:
[0079] Transfer 0 mL, 1.00 mL, 2.00 mL, 4.00 mL, 6.00 mL, 8.00 mL, and 10.00 mL of 0.1 mg / mL silver standard solution to seven 100 mL volumetric flasks. Add 50 mL of 20 mg / mL magnesium standard solution and 4 mL of thiourea aqueous solution to each flask. Dilute to volume with deionized water and mix well to obtain standard solutions with a silver mass fraction of 0.010% to 0.100%.
[0080] Transfer 0 mL, 1.00 mL, 2.00 mL, 4.00 mL, 6.00 mL, 8.00 mL, and 10.00 mL of 0.1 mg / mL silver standard solution to seven 100 mL volumetric flasks. Add 5 mL of 20 mg / mL magnesium standard solution and 4 mL of thiourea aqueous solution to each flask. Dilute to volume with deionized water and mix well to obtain standard solutions with a silver mass fraction of 0.100%–1.00%.
[0081] Transfer 0 mL, 1.00 mL, 2.00 mL, 4.00 mL, 6.00 mL, 8.00 mL, and 10.00 mL of 0.1 mg / mL silver standard solution to seven 100 mL volumetric flasks. Add 1 mL of 20 mg / mL magnesium standard solution and 4 mL of thiourea aqueous solution to each flask. Dilute to volume with deionized water and mix well to obtain standard solutions with a silver mass fraction of 1.00%–5.00%.
[0082] The above-obtained standard solutions with silver mass fractions of 0.010% to 0.100%, 0.100% to 1.00%, and 1.00% to 5.00% constitute a series of standard solutions.
[0083] II. Preparation of sample solution:
[0084] The magnesium-silver alloy sample to be tested was processed into fragments, and 1.000g was weighed and placed in a 250mL beaker. 30mL of nitric acid solution and 3~5 drops of hydrogen peroxide were added to obtain the sample solution.
[0085] III. Preparation of test solution based on silver content:
[0086] Based on the estimated silver content of the magnesium-silver alloy sample upon arrival, three types of solutions were prepared to obtain test solution A, test solution B, or test solution C.
[0087] IV. Testing and Calculation:
[0088] The series of standard solutions obtained in step one, along with test solutions A, B, or C, are placed in a flame atomic absorption spectrometer. Under the set working conditions, absorbance is measured using an air-acetylene lean flame and zeroing with water. A working curve is plotted with silver mass concentration on the x-axis and absorbance on the y-axis. The corresponding silver concentration is found from the plotted working curve based on the absorbance of test solutions A, B, or C. The silver content in test solutions A, B, or C is calculated using the formula, thus completing the detection.
[0089] In this embodiment, the concentration of the thiourea aqueous solution in steps one and three is 50 g / L.
[0090] The particle size of the debris in step two of this embodiment is 0.5 mm.
[0091] The nitric acid solution described in step two of this embodiment is prepared by mixing concentrated nitric acid and deionized water in a volume ratio of 1:1.
[0092] The hydrogen peroxide in step two of this embodiment has a concentration of ρ = 1.10 g / mL.
[0093] Step three of this embodiment involves preparation in three different scenarios, as detailed below:
[0094] When the silver mass fraction is 0.100% to 1.00%, take all the above sample solutions and transfer them into a 100 mL volumetric flask. Add 10 mL of nitric acid and 4 mL of thiourea aqueous solution, then dilute to volume with deionizer and mix well to obtain test solution A.
[0095] Alternatively, when the silver mass fraction is 1.00% to 5.00%, take all of the above sample solutions and transfer them into a 100 mL volumetric flask. Add 10 mL of test solution A and 4 mL of thiourea aqueous solution, then dilute to volume with deionizer and mix well to obtain test solution B.
[0096] Alternatively, when the silver mass fraction is 1.00% to 5.00%, take all of the above sample solutions and transfer them to a 500 mL volumetric flask. Add 10 mL of test solution A and 4 mL of thiourea aqueous solution, then dilute to volume with deionizer and mix well to obtain the test solution C.
[0097] In step four of this embodiment, the series of standard solutions are paired with test solution A, test solution B, or test solution C as follows:
[0098] A series of standard solutions with a silver mass fraction of 0.010% to 0.100% are paired with test solution A;
[0099] A series of standard solutions with a silver mass fraction of 0.100% to 1.00% are paired with test solution B;
[0100] A series of standard solutions with a silver mass fraction of 1.00% to 5.00% are used to pair with test solution C.
[0101] The flame atomic absorption spectrometer described in step four of this embodiment has a measurement range of 190nm to 990nm.
[0102] The working conditions set in step four of this embodiment are as follows: a flame atomic absorption spectrometer with a wavelength of 328.1 nm, a silver hollow cathode lamp as the light source, a lamp current of 2.0 mA, a burner height of 6 mm, a gas flow rate of 1200 mL / min, a compressed air pressure of 0.28 MPa, and a slit width of 0.8 nm.
[0103] The formula shown in step four of this embodiment: Silver content is expressed as silver mass fraction w Ag The value is expressed as a percentage of mass, and the formula is as follows:
[0104] ρ—The mass concentration of silver in the analytical solution, obtained from the working curve, in µg / mL.
[0105] V0—The final volume of the sample solution, in mL.
[0106] V2 — The final volume of the test solution transferred, in mL.
[0107] m — the mass of the sample, in grams.
[0108] V1 — Volume of test solution transferred, in mL.
[0109] 1. Conduct accuracy tests (0.01%~4.0%): Spike recovery
[0110] Weigh 1.000 g of pure magnesium (w(Mg)≥99.99%) and follow the analytical procedure. After separation, add Ag standard solution (0.1 mg / mL) to each sample. The simulated theoretical values are 0.01%, 0.1%, 1.0%, and 3.0%, respectively. The results are shown in Table 1. The experimental data show that under the optimal determination conditions, the spiked recovery rate for determining the silver content in magnesium alloys is between 97.4% and 102.5%. This method is simple, rapid, accurate, and reliable, and can meet the requirements for determining the silver content in magnesium and magnesium alloys from 0.010% to 5.00%.
[0111] Table 1 Results of Spiked Recovery Test
[0112]
[0113] 2. Actual sample testing
[0114] Actual samples of Mg-Ag (0.035), Mg-Ag (0.35), and Mg-Ag (3.50) were tested, and the results are shown in Table 2. The relative standard deviation was less than 5%, and the relative error was less than 5%, proving that the method can accurately determine the silver element in actual magnesium alloy samples within the detection range of 0.010% to 5.00% silver element.
[0115] Table 2 Actual Sample Testing
[0116]
Claims
1. A method for detecting silver in a magnesium-silver alloy, characterized in that, It is implemented in the following steps: I. Preparation of a series of standard solutions: Transfer 0 mL, 1.00 mL, 2.00 mL, 4.00 mL, 6.00 mL, 8.00 mL, and 10.00 mL of 0.1 mg / mL silver standard solution to seven 100 mL volumetric flasks. Add 50 mL of 20 mg / mL magnesium standard solution and 4 mL of thiourea aqueous solution to each flask. Dilute to volume with deionized water and mix well to obtain standard solutions with a silver mass fraction of 0.010% to 0.100%. Transfer 0 mL, 1.00 mL, 2.00 mL, 4.00 mL, 6.00 mL, 8.00 mL, and 10.00 mL of 0.1 mg / mL silver standard solution to seven 100 mL volumetric flasks. Add 5 mL of 20 mg / mL magnesium standard solution and 4 mL of thiourea aqueous solution to each flask. Dilute to volume with deionized water and mix well to obtain standard solutions with a silver mass fraction of 0.100%–1.00%. Transfer 0 mL, 1.00 mL, 2.00 mL, 4.00 mL, 6.00 mL, 8.00 mL, and 10.00 mL of 0.1 mg / mL silver standard solution to seven 100 mL volumetric flasks. Add 1 mL of 20 mg / mL magnesium standard solution and 4 mL of thiourea aqueous solution to each flask. Dilute to volume with deionized water and mix well to obtain standard solutions with a silver mass fraction of 1.00%–5.00%. The above-obtained standard solutions with silver mass fractions of 0.010% to 0.100%, 0.100% to 1.00%, and 1.00% to 5.00% constitute a series of standard solutions. II. Preparation of sample solution: The magnesium-silver alloy sample to be tested was processed into fragments, and 1.000g was weighed and placed in a 250mL beaker. 30mL of nitric acid solution and 3~5 drops of hydrogen peroxide were added to obtain the sample solution. III. Preparation of test solution based on silver content: Based on the estimated silver content of the magnesium-silver alloy sample upon arrival, three types of solutions were prepared to obtain test solution A, test solution B, or test solution C. IV. Testing and Calculation: The series of standard solutions obtained in step one, along with test solutions A, B, or C, are placed in a flame atomic absorption spectrometer. Under the set working conditions, absorbance is measured using an air-acetylene lean flame and zeroing with water. A working curve is plotted with silver mass concentration on the x-axis and absorbance on the y-axis. The corresponding silver concentration is found from the plotted working curve based on the absorbance of test solutions A, B, or C. The silver content in test solutions A, B, or C is calculated using the formula, thus completing the detection.
2. The method for detecting silver in a magnesium-silver alloy according to claim 1, characterized in that, The concentration of the thiourea aqueous solution mentioned in steps one and three is 50 g / L.
3. The method for detecting silver in a magnesium-silver alloy according to claim 1, characterized in that, The particle size of the debris mentioned in step two is 0.5~1mm.
4. The method for detecting silver in a magnesium-silver alloy according to claim 1, characterized in that, The nitric acid solution mentioned in step two is prepared by mixing concentrated nitric acid and deionized water in a volume ratio of 1:
1.
5. The method for detecting silver in a magnesium-silver alloy according to claim 1, characterized in that, The hydrogen peroxide mentioned in step two has a concentration of ρ = 1.10 g / mL.
6. The method for detecting silver in a magnesium-silver alloy according to claim 1, characterized in that, Step three involves three different preparation methods, as detailed below: When the silver mass fraction is 0.100% to 1.00%, take all the above sample solutions and transfer them into a 100 mL volumetric flask. Add 10 mL of nitric acid and 4 mL of thiourea aqueous solution, then dilute to volume with deionizer and mix well to obtain test solution A. Alternatively, when the silver mass fraction is 1.00% to 5.00%, take all of the above sample solutions and transfer them into a 100 mL volumetric flask. Add 10 mL of test solution A and 4 mL of thiourea aqueous solution, then dilute to volume with deionizer and mix well to obtain test solution B. Alternatively, when the silver mass fraction is 1.00% to 5.00%, take all of the above sample solutions and transfer them to a 500 mL volumetric flask. Add 10 mL of test solution A and 4 mL of thiourea aqueous solution, then dilute to volume with deionizer and mix well to obtain the test solution C.
7. The method for detecting silver in a magnesium-silver alloy according to claim 1, characterized in that, In step four, the series of standard solutions are paired with test solution A, test solution B, or test solution C as follows: A series of standard solutions with a silver mass fraction of 0.010% to 0.100% are paired with test solution A; A series of standard solutions with a silver mass fraction of 0.100% to 1.00% are paired with test solution B; A series of standard solutions with a silver mass fraction of 1.00% to 5.00% are used to pair with test solution C.
8. The method for detecting silver in a magnesium-silver alloy according to claim 1, characterized in that, The flame atomic absorption spectrometer described in step four has a measurement range of 190 nm to 990 nm.
9. The method for detecting silver in a magnesium-silver alloy according to claim 1, characterized in that, The working conditions set in step four are as follows: a flame atomic absorption spectrometer with a wavelength of 328.1 nm, a silver hollow cathode lamp as the light source, a lamp current of 2.0 mA, a burner height of 6 mm, a gas flow rate of 1200 mL / min, a compressed air pressure of 0.28 MPa, and a slit width of 0.8 nm.
10. The method for detecting silver in a magnesium-silver alloy according to claim 1, characterized in that, The formula shown in step four: Silver content is expressed as silver mass fraction w Ag The value is expressed as a percentage of mass, and the formula is as follows: ρ—The mass concentration of silver in the analytical solution, obtained from the working curve, in µg / mL. V0—The final volume of the sample solution, in mL. V2 — The final volume of the test solution transferred, in mL. m — the mass of the sample, in grams. V1 — Volume of test solution transferred, in mL.