Method, device and masking agent for the detection of zinc ions in water

Abstract

The application discloses a method and device for detecting zinc ions in water quality and a masking agent. The method comprises the following steps: obtaining a water quality sample to be detected; adding ammonia water into the water quality sample to be detected, mixing, and obtaining a first intermediate reaction product; adding a sodium citrate solution into the first intermediate reaction product, mixing, and obtaining a second intermediate reaction product; and detecting the second intermediate reaction product to determine the content of zinc ions in the water quality sample to be detected. The application solves the technical problem of low accuracy in detecting the content of zinc ions in a water quality sample with high contents of calcium ions and magnesium ions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water quality detection, in particular to a detection method, device and masking agent for zinc ions in water quality. BACKGROUND

[0002] Among the metals used by modern humans, zinc is the fourth most used heavy metal after iron, aluminum and copper. In recent years, with the rapid development of economy, the production and consumption of zinc have also grown rapidly. The waste of mining, pigments, smelting, electroplating, metal processing, chemical industry and other industries has become the main source of zinc heavy metal pollution in the environment. Therefore, it is of great significance to monitor the content of zinc ions in water quality. The commonly used methods for determining zinc include direct suction flame atomic absorption spectrophotometry, dithizone spectrophotometry and anodic stripping voltammetry. The detection process of these methods is relatively complex, and the detection equipment and personnel have high requirements, which is difficult to realize the automatic detection of the whole process by instrument. The zinc reagent spectrophotometry method is simple and has short detection time, but since the test solution in the zinc reagent spectrophotometry method is colored under weak alkaline conditions, the water quality sample with high content of calcium and magnesium ions will produce precipitate, thereby affecting the accuracy of the detection result. SUMMARY

[0003] The main purpose of the present application is to provide a detection method, device and masking agent for zinc ions in water quality, aiming to solve the technical problem of low accuracy of detecting the content of zinc ions in water quality samples with high content of calcium and magnesium ions in the prior art.

[0004] To achieve the above-mentioned purpose, the present application provides a detection method for zinc ions in water quality, which comprises the following steps:

[0005] Obtaining a water quality sample to be detected;

[0006] Adding ammonia water to the water quality sample to be detected, mixing to obtain a first intermediate reaction product;

[0007] Adding sodium citrate solution to the first intermediate reaction product, mixing to obtain a second intermediate reaction product;

[0008] Detecting the second intermediate reaction product to determine the content of zinc ions in the water quality sample to be detected.

[0009] Optionally, the concentration of the ammonia water is 2-5%, the concentration of the sodium citrate solution is 150-220 g / L, and the volume ratio of the water quality sample to be detected, the ammonia water and the sodium citrate solution in the sample solution to be detected is (4-6): 1: 1.

[0010] Optionally, the step of adding ammonia water into the water quality sample to be detected and mixing to obtain a first intermediate reaction product comprises:

[0011] The step of adding ammonia water into the water quality sample to be detected and mixing to obtain a first intermediate reaction product comprises:

[0012] Optionally, the step of adding sodium citrate solution into the first intermediate reaction product and mixing to obtain a second intermediate reaction product comprises:

[0013] The step of adding sodium citrate solution into the first intermediate reaction product and mixing to obtain a second intermediate reaction product comprises:

[0014] Optionally, the step of detecting the second intermediate reaction product to determine the content of zinc ions in the water quality sample to be detected comprises:

[0015] The step of detecting the second intermediate reaction product to determine the content of zinc ions in the water quality sample to be detected comprises:

[0016] The step of detecting the second intermediate reaction product to determine the content of zinc ions in the water quality sample to be detected comprises:

[0017] The step of detecting the second intermediate reaction product to determine the content of zinc ions in the water quality sample to be detected comprises:

[0018] Optionally, the concentration of the zinc reagent solution is 1-3 g / L, and the ratio of the addition volume of the zinc reagent solution to the addition volume of the water quality sample to be detected is 8:1-12:1.

[0019] Optionally, 0.8-1.2 g of sodium hydroxide is added per 1 L of the zinc reagent solution.

[0020] Further, the application also provides a masking agent for the detection method of zinc ions in water quality as described above, wherein the masking agent comprises a first masking agent and a second masking agent, and the first masking agent is ammonia water and the second masking agent is sodium citrate solution.

[0021] Further, the application also provides a detection device for zinc ions in water quality, which comprises:

[0022] A water quality sample acquisition module is configured to acquire a water quality sample to be detected.

[0023] A first reagent adding module is configured to add ammonia water into the water quality sample to be detected and mix to obtain a first intermediate reaction product.

[0024] A second reagent adding module is configured to add sodium citrate solution into the first intermediate reaction product and mix to obtain a second intermediate reaction product.

[0025] a zinc ion determination module configured to determine the zinc ion content in the water quality sample to be detected by detecting the second intermediate reaction product.

[0026] Optionally, the zinc ion determination module is a colorimetric determination module, comprising:

[0027] a third reagent adding unit configured to add a zinc reagent solution to the sample solution to be detected, mix and stand for 5-15 minutes to obtain a sample solution to be colorimetrically detected;

[0028] a colorimetric unit configured to detect the absorbance value of the sample solution to be colorimetrically detected;

[0029] a calculation unit configured to calculate the zinc ion content in the water quality sample to be detected according to the absorbance value.

[0030] The application provides a method and device for detecting zinc ions in water quality and a masking agent. The method comprises the steps of obtaining a water quality sample to be detected, adding ammonia water to the water quality sample to be detected, mixing to obtain a first intermediate reaction product, adding a sodium citrate solution to the first intermediate reaction product, mixing to obtain a second intermediate reaction product, and detecting the second intermediate reaction product to determine the zinc ion content in the water quality sample to be detected. By adding ammonia water and a sodium citrate solution to the water quality sample, metal ions such as calcium and magnesium in the water quality sample are masked, thereby effectively avoiding precipitation of the water quality sample with high calcium and magnesium ion content under alkaline conditions and improving the detection accuracy of the zinc ion content in the water quality sample with high calcium and magnesium ion content. BRIEF DESCRIPTION OF DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and serve to explain the principles of the application together with the specification.

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, for those skilled in the art, other drawings can also be obtained based on these drawings without creative labor.

[0033] Figure 1 a flowchart of an embodiment of the method for detecting zinc ions in water quality of the application;

[0034] Figure 2 a structural schematic diagram of an embodiment of the device for detecting zinc ions in water quality of the application.

[0035] The objectives, functional characteristics and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0036] In order to make the above objectives, characteristics and advantages of the present application more apparent, clear and complete, the technical solutions in the embodiments of the present application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0037] Among the metals used by modern human beings, zinc is the fourth largest heavy metal in use after iron, aluminum and copper. In recent years, with the rapid development of economy, the production and consumption of zinc have also been rapidly increasing. The waste of mining, pigments, smelting, electroplating, metal processing, chemical industry and other industries has become the main source of zinc heavy metal pollution in the environment. Therefore, it is of great significance to monitor the content of zinc ions in water quality. The commonly used methods for determining zinc include direct suction flame atomic absorption spectrophotometry, dithizone spectrophotometry and anodic stripping voltammetry. The detection process of these methods is relatively complex, and the detection equipment and detection personnel are required to be high. It is difficult to realize the automatic detection of the whole process through the instrument, and it is necessary to periodically sample and send to the laboratory for detection by professional detection personnel. However, this periodic sampling method has a long detection cycle and poor timeliness, so the water quality online monitoring equipment is proposed. The water quality online monitoring equipment is often set near the water source, and the water sample is automatically collected and detected at regular intervals, and the detection results are uploaded. The detection personnel can remotely confirm the results. The above-mentioned commonly used methods for determining zinc are difficult to apply to water quality online monitoring equipment. The zinc reagent spectrophotometry has simple pretreatment, simple detection method and short detection time, and is very suitable for application in water quality online monitoring equipment. However, since the test solution in the zinc reagent spectrophotometry is colored under weak alkaline conditions, and the zinc reagent solution itself is unstable and easy to precipitate, the storage time at room temperature is not more than one month, so when used in online monitoring equipment, it is stored in alkaline solution. For water samples with high content of calcium and magnesium ions, calcium and magnesium ions will react with hydroxyl ions in the solution to form precipitates, thereby affecting the accuracy of the detection results.

[0038] The application adjusts the water quality sample to be detected to weak alkaline by ammonia water, provides an alkaline color developing environment for subsequent zinc ion determination, and the ammonia water can also complex with calcium and magnesium ions in the water quality sample to be detected, so that the calcium and magnesium ions and hydroxyl ions do not form a precipitate, the calcium and magnesium ions are masked, sodium citrate solution is further used to complex with nickel, chromium, lead and other metal ions in the water quality sample to be detected, the nickel, chromium, lead and other metal ions are masked, and then the second intermediate reaction product after the metal ions are masked is used for zinc ion determination, so that the accuracy of zinc ion detection in water quality is effectively improved. It is found through experimental detection that the masking agent used in the application has good masking effect on the water quality sample to be detected with calcium and magnesium ion content of 1200mg / L or less.

[0039] The embodiment of the application provides a water quality zinc ion detection method.

[0040] In step S10, a water quality sample to be detected is obtained.

[0041] In the embodiment, it should be noted that the water quality zinc ion detection method can be manually operated, or the corresponding program can be automatically executed by an automatic detection device.

[0042] The water quality sample to be detected is a water quality sample to be detected for zinc ion content detection. The content of other metal ions in the water quality sample to be detected may be high or low. If the total amount of calcium and magnesium ions is high, for example, 500mg / L, 800mg / L, 1200mg / L or the like, the ammonia water and sodium citrate solution can be used for masking. If the total amount of calcium and magnesium ions is low, the ammonia water plays a role of adjusting pH in the reaction system, and the sodium citrate plays a role of buffer, stabilizer and complexing agent in the reaction system, which can improve the stability of zinc ion detection and does not interfere with the detection of zinc ions. That is, the water quality zinc ion detection method of the embodiment has universal applicability. Although the ammonia water and sodium citrate solution in the embodiment can mask the metal ions other than zinc ions in the water quality sample to be detected, the water quality zinc ion detection method of the embodiment can also be used for detection of the water quality sample with low content of metal ions other than zinc ions.

[0043] The water quality sample to be detected is usually sewage meeting the national standard discharge requirement, and thus the pH value should be 6-9. In an implementable mode, after the step of obtaining the water quality sample to be detected, the method can further include detecting the pH value of the water quality sample to be detected. If the pH value of the water quality sample to be detected is less than 6 or greater than 9, the pH value of the water quality sample to be detected is adjusted to the range of 6-9, and then the step of adding ammonia water into the water quality sample to be detected, mixing and obtaining the first intermediate reaction product is performed. If the pH value of the water quality sample to be detected is greater than or equal to 6 and less than or equal to 9, the step of adding ammonia water into the water quality sample to be detected, mixing and obtaining the first intermediate reaction product is performed.

[0044] Specifically, a certain volume of the water quality sample to be detected is measured in a reaction container, wherein the sampling volume of the water quality sample to be detected can be determined according to actual needs, and the embodiment does not limit this.

[0045] Step S20, ammonia water is added into the water quality sample to be detected, mixed and uniformly, and a first intermediate reaction product is obtained.

[0046] In the embodiment, specifically, a certain volume of ammonia water is measured, the measured ammonia water is added into the reaction container, and mixed with the water quality sample to be detected in the reaction container to obtain the first intermediate reaction product.

[0047] Optionally, the step of adding ammonia water into the water quality sample to be detected, mixing and obtaining the first intermediate reaction product includes:

[0048] The ammonia water is added into the water quality sample to be detected, mixed and uniformly, and placed for 3-5 min to obtain the first intermediate reaction product.

[0049] In the embodiment, specifically, a certain volume of ammonia water is measured, the measured ammonia water is added into the reaction container, and mixed with the water quality sample to be detected in the reaction container to obtain the first intermediate reaction product.

[0050] Step S30, sodium citrate solution is added into the first intermediate reaction product, mixed and uniformly, and a second intermediate reaction product is obtained.

[0051] In the embodiment, specifically, a certain volume of sodium citrate solution is measured, the measured sodium citrate solution is added into the reaction container, and mixed with the first intermediate reaction product in the reaction container to obtain the second intermediate reaction product.

[0052] Optionally, the step of adding the sodium citrate solution into the first intermediate reaction product, mixing, and obtaining the second intermediate reaction product comprises:

[0053] The step of adding the sodium citrate solution into the first intermediate reaction product, mixing, and obtaining the second intermediate reaction product comprises:

[0054] In this embodiment, specifically, a certain volume of the sodium citrate solution is measured, the measured sodium citrate solution is added into the reaction container, mixed with the first intermediate reaction product in the reaction container, and left to stand for 3-5 minutes, for example, 3 minutes, 4 minutes, 5 minutes, etc., so that the sodium citrate solution fully reacts with the metal ions such as calcium, magnesium, nickel, chromium, and lead ions in the first intermediate reaction product to form a complex, and the second intermediate reaction product is obtained. It should be noted that when the total amount of calcium and magnesium ions in the to-be-detected sample is high, the ammonia water cannot fully complex with all the calcium and magnesium ions, and the free calcium and magnesium ions can further react with the sodium citrate solution to form a complex.

[0055] Optionally, the concentration of the ammonia water is 2-5%, the concentration of the sodium citrate solution is 150-220 g / L, and the volume ratio of the to-be-detected water quality sample, the ammonia water, and the sodium citrate solution in the to-be-detected sample solution is (4-6): 1: 1.

[0056] In this embodiment, specifically, the ammonia water is a water solution containing 2-5% (for example, 2%, 3%, 4%, 5%, etc.) ammonia, the concentration of the sodium citrate solution is 150-220 g / L (for example, 150 g / L, 180 g / L, 200 g / L, 220 g / L, etc.), and the volume ratio of the to-be-detected water quality sample, the ammonia water, and the sodium citrate solution in the to-be-detected sample solution is (4-6): 1: 1 (for example, 4: 1: 1, 5: 1: 1, 6: 1: 1, etc.).

[0057] Step S40, detecting the second intermediate reaction product to determine the content of zinc ions in the to-be-detected water quality sample.

[0058] In this embodiment, specifically, the second intermediate reaction product is detected for zinc ions, and according to the detection result, the content of zinc ions in the to-be-detected water quality sample can be determined by calculation. The zinc ion detection can be titration detection, colorimetric detection, etc.

[0059] Optionally, the step of detecting the second intermediate reaction product to determine the content of zinc ions in the to-be-detected water quality sample comprises:

[0060] Step S41, adding a zinc reagent solution into the second intermediate reaction product, mixing, and leaving to stand for 5-15 minutes to obtain a to-be-colorimetric sample solution.

[0061] Step S42, detecting the absorbance value of the colorimetric sample solution;

[0062] Step S43, calculating the zinc ion content in the water quality sample according to the absorbance value.

[0063] In this embodiment, specifically, a certain volume of zinc reagent solution is measured, the measured zinc reagent solution is added to the reaction container, mixed with the second intermediate reaction product in the reaction container, and left to react for 5-15 min, for example, 5 min, 8 min, 10 min, 12 min, 15 min, etc., so that the zinc ions in the second intermediate reaction product combine with the zinc reagent to generate a blue complex, obtaining a colorimetric sample solution, and the absorbance value of the colorimetric sample solution is detected by a spectrophotometer. The absorbance value is substituted into a preset standard curve, and the zinc ion content in the water quality sample to be detected can be calculated. The zinc reagent is o-2-(2-hydroxy-5-sulfophenylazo) benzylidene hydrazine benzoic acid, and the solvent of the zinc reagent solution is ethanol or methanol.

[0064] Optionally, the concentration of the zinc reagent solution is 1-3 g / L, and the ratio of the added volume of the zinc reagent solution to the added volume of the water quality sample to be detected is 8:1-12:1.

[0065] In this embodiment, specifically, the concentration of the zinc reagent solution is 1-3 g / L, for example, 1 g / L, 2 g / L, 3 g / L, etc., and the ratio of the added volume of the zinc reagent solution to the added volume of the water quality sample to be detected is 8:1-12:1, for example, 8:1, 10:1, 12:1, etc.

[0066] Optionally, 0.8-1.2 g of sodium hydroxide is added per 1 L of the zinc reagent solution.

[0067] In this embodiment, specifically, since the zinc reagent solution itself is very unstable and is prone to precipitation and deterioration, the storage time at room temperature does not exceed one month, so when used in online monitoring equipment, 0.8-1.2 g (for example, 0.8 g, 1.0 g, 1.2 g, etc.) of sodium hydroxide is added per 1 L of the zinc reagent solution to improve the stability of the zinc reagent solution and prolong its shelf life. For example, a 1 mol / L sodium hydroxide solution can be configured, and 20-30 mL of the 1 mol / L sodium hydroxide solution is added per 1 L of the zinc reagent solution according to the volume of the zinc reagent solution.

[0068] In an implementable manner, the step of detecting the second intermediate reaction product to determine the zinc ion content in the water quality sample to be detected comprises: measuring a volume of the second intermediate reaction product, adding a chromium black T solution and formaldehyde, titrating by an EDTA standard solution, and determining the zinc ion content in the water quality sample to be detected according to the volume of the EDTA standard solution consumed. The chromium black T solution is blue in itself, and forms a wine red complex with zinc ions in the reaction system in the presence of formaldehyde. Since the suitable pH value of the reaction system in this method is 10, which is an alkaline environment, hydroxyl ions in the alkaline environment are prone to form precipitates with calcium and magnesium ions in the water quality sample to be detected, thereby affecting the accuracy of the detection result. In this embodiment, the masking effect of ammonia and sodium citrate on metal ions such as calcium and magnesium ions can effectively avoid the precipitation in the titration process, and improve the detection accuracy of zinc ions in the water quality.

[0069] In this embodiment, the method for detecting zinc ions in water quality comprises the steps of: obtaining a water quality sample to be detected; adding ammonia to the water quality sample to be detected and mixing to obtain a first intermediate reaction product; adding a sodium citrate solution to the first intermediate reaction product and mixing to obtain a second intermediate reaction product; and detecting the second intermediate reaction product to determine the zinc ion content in the water quality sample to be detected. Through the above technical solution, ammonia and a sodium citrate solution are added to the water quality sample to mask calcium, magnesium and other metal ions in the water quality sample, thereby effectively avoiding the precipitation of water quality samples with high calcium and magnesium ion content under alkaline conditions, improving the detection accuracy of zinc ion content in water quality samples with high calcium and magnesium ion content. It is found through experimental detection that the masking agent used in this application has good masking effect on water quality samples to be detected with calcium and magnesium ion content of 1200 mg / L or less under alkaline conditions of 8-10, no precipitate is generated, and the color development effect is good, the recovery rate is high, and the detection accuracy is good.

[0070] Further, the application further provides a masking agent, which is applied to the method for detecting zinc ions in water quality as described above, and the masking agent comprises a first masking agent and a second masking agent, wherein the first masking agent is ammonia, and the second masking agent is a sodium citrate solution.

[0071] In an implementable manner, the concentration of the ammonia is 2-5%, for example, 2%, 3%, 4%, 5%, etc., and the concentration of the sodium citrate solution is 150-220 g / L, for example, 150 g / L, 180 g / L, 200 g / L, 220 g / L, etc.

[0072] In an implementable manner, the ratio of the addition amount of the ammonia to the addition amount of the sodium citrate solution when used is 1:1.

[0073] The masking agent provided by the present application solves the technical problem of low accuracy in detecting the content of zinc ions in a water quality sample with high contents of calcium ions and magnesium ions. Compared with the prior art, the water quality zinc ion detection device provided by the embodiment of the present application has the same beneficial effects as the water quality zinc ion detection method of the above-mentioned embodiment, and will not be described here.

[0074] Further, the present application also provides a water quality zinc ion detection device, referring to Figure 2 , the water quality zinc ion detection device comprises:

[0075] The water quality sample acquisition module 10 is used to acquire a water quality sample to be detected.

[0076] The first reagent adding module 20 is used to add ammonia water to the water quality sample to be detected, mix, and obtain a first intermediate reaction product.

[0077] The second reagent adding module 30 is used to add a sodium citrate solution to the first intermediate reaction product, mix, and obtain a second intermediate reaction product.

[0078] The zinc ion determination module 40 is used to detect the second intermediate reaction product and determine the content of zinc ions in the water quality sample to be detected.

[0079] In this embodiment, specifically, the water quality sample acquisition module 10 can include but is not limited to a conveying pipeline, a water pump, a water quality sample storage tank, a filter membrane, a timer, and / or a metering device, etc. The metering device is a device for quantitatively measuring a certain volume of liquid.

[0080] In an implementable manner, the water quality zinc ion detection device can further comprise a reactor, a water quality acquisition module, a waste liquid storage tank, etc. The water quality acquisition module is connected in communication with an external water source through a conveying pipeline. The water pump is used to pump water from the external water source to the water quality sample storage tank of the online monitoring system at regular time intervals to obtain a water quality sample. The water pump includes a peristaltic pump, a vacuum pump, a metering pump, etc.

[0081] The first reagent adding module 20 can include but is not limited to a conveying pipeline, a first reagent storage tank, a filter membrane, a timer, and / or a metering device, etc.

[0082] The second reagent adding module 30 can include but is not limited to a conveying pipeline, a second reagent storage tank, a filter membrane, a timer, and / or a metering device, etc.

[0083] It is easy to understand that the first reagent adding module 20 and the second reagent adding module 30 are two independent reagent adding modules, but it is not limited that the first reagent adding module 20 can only be used for adding ammonia water, and the second reagent adding module 30 can only be used for adding sodium citrate solution, that is, if the sodium citrate solution is stored in the first reagent storage tank, and the ammonia water is stored in the second reagent storage tank, the second reagent adding module 30 is used for adding the ammonia water into the water quality sample to be detected, and mixing to obtain a first intermediate reaction product, and the first reagent adding module 20 is used for adding the sodium citrate solution into the first intermediate reaction product, and mixing to obtain a second intermediate reaction product.

[0084] The zinc ion measuring module 40 can include, but is not limited to, a cuvette, a spectrophotometer, a burette, a conveying pipeline, a standard solution storage tank, a filter membrane, a sensor, a timer and / or a metering device, etc.

[0085] Optionally, the zinc ion measuring module 40 is a colorimetric measuring module, which includes:

[0086] A third reagent adding unit is configured to add a zinc reagent solution into the sample solution to be detected, mix, and stand for 5-15 min to obtain a sample solution to be colorimetrically detected;

[0087] A colorimetric unit is configured to detect an absorbance value of the sample solution to be colorimetrically detected;

[0088] A calculation unit is configured to calculate the content of zinc ions in the water quality sample according to the absorbance value.

[0089] The water quality zinc ion detection device provided by the application solves the technical problem of low accuracy of detecting the content of zinc ions in a water quality sample with high contents of calcium ions and magnesium ions in the prior art. Compared with the prior art, the water quality zinc ion detection device provided by the embodiment of the application has the same beneficial effects as the water quality zinc ion detection method described above, and thus will not be described here.

[0090] The above is only the preferred embodiment of the application, and does not limit the patent scope of the application, and any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent processing scope of the application.

Claims

1. A method for detecting zinc ions in water, characterized in that: The detection method of zinc ions in the water comprises the following steps: Obtain water samples to be tested; Add 2-5% ammonia water to the water sample to be tested, mix well, and let stand for 3-5 minutes to obtain a first intermediate reaction product; Adding 150-220 g / L of sodium citrate solution to the first intermediate reaction product, mixing, and letting it stand for 3-5 minutes to obtain a second intermediate reaction product, wherein the volume ratio of the water quality sample to be tested, the ammonia water, and the sodium citrate solution in the second intermediate reaction product is (4-6):1:1; Adding the zinc reagent solution to the second intermediate reaction product, mixing, and letting it stand for 5 to 15 minutes to obtain a sample solution to be compared; Detecting the absorbance value of the sample solution to be colorimetrically compared; The zinc ion content in the water sample to be tested is calculated according to the absorbance value.

2. the detection method of zinc ion in water quality as claimed in claim 1, is characterized in that, The concentration of the zinc reagent solution is 1-3 g / L, and the ratio of the added volume of the zinc reagent solution to the added volume of the water quality sample to be tested is 8:1-12:

1.

3. the detection method of zinc ion in water quality as claimed in claim 2, is characterized in that, Add 0.8-1.2 g of sodium hydroxide per 1 L of the zinc reagent solution.

4. A device for detecting zinc ions in water, characterized in that: The detection equipment of zinc ions in the water quality includes: A water quality sample acquisition module is used to obtain water quality samples to be tested; A first reagent adding module is used to add 2-5% ammonia water to the water quality sample to be tested, mix it evenly, and let it stand for 3-5 minutes to obtain a first intermediate reaction product; A second reagent adding module is used to add 150-220 g / L of sodium citrate solution to the first intermediate reaction product, mix well, and let it stand for 3-5 minutes to obtain a second intermediate reaction product, wherein the volume ratio of the water quality sample to be tested, the ammonia water, and the sodium citrate solution in the second intermediate reaction product is (4-6):1:1; Colorimetric assay module, including: A third reagent adding unit is used to add a zinc reagent solution to the second intermediate reaction product, mix it evenly, and let it stand for 5 to 15 minutes to obtain a sample solution to be compared; A colorimetric unit, used to detect the absorbance value of the sample solution to be colorimetric; The calculation unit is used to calculate the zinc ion content in the water sample to be tested according to the absorbance value.

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