Composite hardness analysis reagent

Abstract

Disclosed in the present application is a composite hardness analysis reagent. The composite hardness analysis reagent comprises a pH regulator, an indicator, a complexing agent, a masking agent, and a solvent. The mass percentages of the pH regulator, the indicator, the complexing agent, the masking agent, and the solvent are 40%-67.5%, 0.3%-2.0%, 0.5%-29.2%, 0.5%-1%, and 30%-50%, respectively. The reagent can accurately measure the hardness of water.

Description

A composite hardness analysis reagent

[0001] Cross-reference to Related Applications

[0002] This application claims priority to the Chinese patent application No. 202410984251.1, filed on July 22, 2024, and entitled "A composite hardness analysis reagent", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application belongs to the technical field of power plant chemical analysis, and relates to a composite hardness analysis reagent. BACKGROUND

[0004] Hardness is an important index for determining raw water treatment depth, controlling circulating cooling water concentration ratio, and preventing system fouling. The hardness of water is clearly defined in relevant national standards and industry standards. The hardness of water generally refers to metal cations such as Ca 2+ , Mg 2+ , Fe 2+ , Mn 2+ , Sr 2+ , Te 3+ , Al 3+ , which are easy to form insoluble salts. In industrial and domestic water, the content of Mn 2+ , Sr 2+ , Te 3+ , Al 3+ is very low and can be ignored, and the hardness is mainly composed of Ca 2+ , Mg 2+ , so the total amount of Ca 2+ , Mg 2+ is usually used as the definition of water hardness. The hardness is measured by EDTA standard solution complexometric titration method, and the size of the hardness is calculated according to the volume and concentration of the EDTA standard solution consumed when the titration end point is reached. According to the different judgment methods of the titration end point, it can be divided into volumetric method and potentiometric titration method.

[0005] 1) Volumetric method: the titration end point is determined by the color change of the added indicator. Hardness indicator can use chrome black T and acid chrome blue K. The advantage of volumetric method is intuitive and stable.

[0006] 2) Potentiometric titration method: it is a method for measuring the change of electric potential by using calcium ion electrode to determine the titration end point. The advantage is that it is not affected by the turbidity and colority of water sample.

[0007] The most commonly used hardness analysis method is the volumetric method, that is, first adjust the pH of the measured liquid to 10 with an ammonia-ammonium chloride buffer solution, use chromium black T as an indicator, and titrate with an EDTA standard solution. The hardness in water is calculated according to the amount of EDTA standard solution consumed as the color of the measured liquid changes.

[0008] With the development of hardness analysis technology, hardness analyzers based on the volumetric method have appeared on the market, which can be used for automatic analysis of water hardness. The volumetric method involves three solutions, which occupy a large volume of solution, which is not conducive to the integration of instruments and equipment. SUMMARY

[0009] The purpose of the present application is to overcome the above-mentioned shortcomings of the prior art, and to provide a composite hardness analysis reagent which can accurately measure the hardness of water.

[0010] To achieve the above-mentioned purpose, the present application discloses a composite hardness analysis reagent, which comprises a pH adjuster, an indicator, a complexing agent, a masking agent and a solvent.

[0011] As a further improvement of the composite hardness analysis reagent described in the present application, the pH adjuster is one or a mixture of the other two in any proportion selected from the group consisting of ammonium chloride and ethanolamine.

[0012] Further, the mass percentages of the pH adjuster, the indicator, the complexing agent, the masking agent and the solvent are 40% to 67.5%, 0.3% to 2.0%, 0.5% to 29.2%, 0.5% to 1% and 30% to 50%, respectively.

[0013] Further, the pH adjuster is one or a mixture of the other two in any proportion selected from the group consisting of ammonium chloride and ethanolamine.

[0014] Further, the indicator is one or a mixture of the other two in any proportion selected from the group consisting of chromium black T and acid chrome blue K.

[0015] Further, the complexing agent is disodium ethylenediaminetetraacetate.

[0016] Further, the masking agent is L-cysteine or triethanolamine.

[0017] Further, the solvent is ethylene glycol or diethanolamine.

[0018] Further, it comprises ammonium chloride, ethanolamine, chromium black T, EDTA-2Na, L-cysteine and diethanolamine, wherein the mass fractions of ammonium chloride, ethanolamine, chromium black T, EDTA-2Na, L-cysteine and diethanolamine are 7.5%, 44.0%, 0.5%, 3.5%, 1.0% and 43.0%, respectively.

[0019] Further, the composite hardness analysis reagent comprises ammonium chloride, diethanolamine, chrome black T, EDTA-2Na and triethanolamine, and the mass fractions of the ammonium chloride, diethanolamine, chrome black T, EDTA-2Na and triethanolamine are 9.5%, 52.0%, 1.0%, 3.5% and 35.0%, respectively.

[0020] Further, the composite hardness analysis reagent comprises ammonium chloride, diethanolamine, chrome black T, EDTA-2Na and triethanolamine, and the mass fractions of the ammonium chloride, diethanolamine, chrome black T, EDTA-2Na and triethanolamine are 9.5%, 52.0%, 1.0%, 3.5% and 35.0%, respectively.

[0021] The application has the following beneficial effects:

[0022] The composite hardness analysis reagent has the following beneficial effects: the pH value of the to-be-measured solution is adjusted by the pH adjuster, the complexing agent reacts with the to-be-measured solution, and the indicator ensures that the solution significantly changes color at the end point of the complexing reaction, so as to prepare for measuring the hardness in water, realize the analysis of the hardness in water by using a single system solution of composite components, avoid the independent addition of multiple reagents, and significantly change the end point color, so that the measurement result is accurate and reliable, and the reagent addition system is simplified. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings constituting a part of the specification use to provide further understanding of the application, and the schematic embodiments of the application and the description thereof are used to explain the application, and do not constitute an improper limitation on the application. In the drawings:

[0024] Fig. 1 is a test result graph of example one;

[0025] Fig. 2 is a test result graph of example two;

[0026] Fig. 3 is a test result graph of example three. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application.

[0028] In the description of the application, it should be understood that the terms "comprising" and "including" indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0029] It should also be understood that the terms used in the specification of the present application are only for the purpose of describing particular embodiments and do not intend to limit the present application. As used in the specification and the appended claims of the present application, unless otherwise clearly indicated by the context, the singular forms "a", "an" and "the" are intended to include the plural forms as well.

[0030] It should be further understood that the term "and / or" used in the specification and the appended claims of the present application means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations, for example, A and / or B can mean: A alone, A and B together, and B alone, the three cases. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0031] It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present application to describe the preset ranges, etc., these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from each other. For example, the first preset range can also be referred to as the second preset range, and similarly, the second preset range can also be referred to as the first preset range, without departing from the scope of the embodiments of the present application.

[0032] Depending on the context, the word "if" as used herein can be interpreted to mean "when" or "while" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detecting (a stated condition or event)" can be interpreted to mean "when determined" or "in response to determining" or "when detecting (a stated condition or event)" or "in response to detecting (a stated condition or event)".

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0034] Various structural schematic diagrams according to the embodiments disclosed in the present application are shown in the drawings. These diagrams are not drawn to scale, in which some details are enlarged for the purpose of clear expression, and some details can be omitted. The shapes of various regions, layers shown in the drawings and their relative size, positional relationship are only exemplary, and in actuality, there can be deviations due to manufacturing tolerances or technical limitations, and regions / layers with different shapes, sizes, relative positions can be additionally designed by those skilled in the art according to actual needs.

[0035] The composite hardness analysis reagent described in the present application comprises a pH adjusting agent, an indicator, a complexing agent, a masking agent and a solvent, wherein the mass percentages of the pH adjusting agent, the indicator, the complexing agent, the masking agent and the solvent are 40% to 67.5%, 0.3% to 2.0%, 0.5% to 29.2%, 0.5% to 1% and 30% to 50%, respectively.

[0036] As an embodiment of the present application, the pH adjusting agent is one or a mixture of two of ammonium chloride and ethanolamine in any ratio.

[0037] As an embodiment of the present application, the indicator is one or a mixture of two of chrome black T and acid chrome blue K in any ratio.

[0038] As an embodiment of the present application, the complexing agent is ethylenediaminetetraacetic acid disodium salt (EDTA-2Na).

[0039] As an embodiment of the present application, the masking agent is L-cysteine or triethanolamine.

[0040] As an embodiment of the present application, the solvent is ethylene glycol or diethanolamine.

[0041] Embodiment one

[0042] The hardness of the water sample to be measured in this embodiment is 100 mg / L-2000 mg / L (in terms of CaCO3), and the composition of the composite reagent is shown in Table 1.

[0043] Table 1

[0044] Example Two

[0045] The hardness of the water sample to be measured in this embodiment is 10 mg / L-100 mg / L (in terms of CaCO3). The composition of the composite reagent is shown in Table 2.

[0046] Table 2

[0047] Example Three

[0048] The hardness of the water sample to be measured in this embodiment is 0.1 mg / L-10 mg / L (in terms of CaCO3). The composition of the composite reagent is shown in Table 3.

[0049] Table 3

[0050] The composite hardness analysis reagent described in the present application is applied to an online hardness analyzer based on the volumetric method. The online hardness analyzer identifies the color of the titration end point by the reaction of the reagent with the solution to be measured, and calculates the hardness of the water sample to be measured. The composite hardness analysis reagent described in the present application is compared with the measurement results of the reagent added independently, and the results are shown in Table 4 (all hardnesses are in terms of CaCO3).

[0051] Table 4

[0052] Example Four

[0053] The composite hardness analysis reagent described in the present application includes a pH adjuster, an indicator, a complexing agent, a masking agent, and a solvent, wherein the mass percentages of the pH adjuster, the indicator, the complexing agent, the masking agent, and the solvent are 67.5%, 0.3%, 1.7%, 0.5%, and 30%, respectively.

[0054] The pH adjuster is ammonium chloride.

[0055] The indicator is chrome black T.

[0056] The complexing agent is ethylenediaminetetraacetic acid disodium salt (EDTA-2Na).

[0057] The masking agent is L-cysteine.

[0058] The solvent is diethanolamine.

[0059] Example Five

[0060] The composite hardness analysis reagent described in the application comprises a pH regulator, an indicator, a complexing agent, a masking agent and a solvent, wherein the mass percentages of the pH regulator, the indicator, the complexing agent, the masking agent and the solvent are 40%, 0.3%, 29.2%, 0.5% and 30% respectively.

[0061] The pH regulator is ethanolamine.

[0062] The indicator is chrome black T.

[0063] The complexing agent is ethylenediamine tetraacetic acid disodium salt (EDTA-2Na).

[0064] The masking agent is L-cysteine.

[0065] The solvent can be ethylene glycol.

[0066] Example Six

[0067] The composite hardness analysis reagent described in the application comprises a pH regulator, an indicator, a complexing agent, a masking agent and a solvent, wherein the mass percentages of the pH regulator, the indicator, the complexing agent, the masking agent and the solvent are 46.5%, 2.0%, 0.5%, 1% and 50% respectively.

[0068] The pH regulator is ammonium chloride.

[0069] The indicator is a mixture of chrome black T and acid chrome blue K in any ratio.

[0070] The complexing agent is ethylenediamine tetraacetic acid disodium salt (EDTA-2Na).

[0071] The masking agent is L-cysteine.

[0072] The solvent is ethylene glycol.

[0073] Example Seven

[0074] The composite hardness analysis reagent described in the application comprises a pH regulator, an indicator, a complexing agent, a masking agent and a solvent, wherein the mass percentages of the pH regulator, the indicator, the complexing agent, the masking agent and the solvent are 50%, 1.2%, 8%, 0.8% and 40% respectively.

[0075] The pH regulator is a mixture of ammonium chloride and ethanolamine in any ratio.

[0076] The indicator is acid chrome blue K.

[0077] The complexing agent is ethylenediamine tetraacetic acid disodium salt (EDTA-2Na).

[0078] The masking agent is L-cysteine.

[0079] The solvent is diethanolamine.

[0080] Example Eight

[0081] The composite hardness analysis reagent described in the application comprises a pH regulator, an indicator, a complexing agent, a masking agent and a solvent, wherein the mass percentages of the pH regulator, the indicator, the complexing agent, the masking agent and the solvent are 45%, 1%, 20%, 1% and 33% respectively.

[0082] The pH regulator is a mixture of ammonium chloride and ethanolamine in any ratio.

[0083] The indicator is a mixture of chrome black T and acid chrome blue K in any ratio.

[0084] The complexing agent is ethylenediaminetetraacetic acid disodium salt (EDTA-2Na).

[0085] The masking agent is triethanolamine.

[0086] The solvent can be ethylene glycol.

[0087] Example Nine

[0088] The composite hardness analysis reagent described in the application comprises a pH regulator, an indicator, a complexing agent, a masking agent and a solvent, wherein the mass percentages of the pH regulator, the indicator, the complexing agent, the masking agent and the solvent are 48%, 1.5%, 5%, 0.5% and 45% respectively.

[0089] The pH regulator is ethanolamine.

[0090] The indicator is acid chrome blue K.

[0091] The complexing agent is ethylenediaminetetraacetic acid disodium salt (EDTA-2Na).

[0092] The masking agent is triethanolamine.

[0093] The solvent is diethanolamine.

[0094] Example Ten

[0095] The composite hardness analysis reagent described in the application comprises a pH regulator, an indicator, a complexing agent, a masking agent and a solvent, wherein the mass percentages of the pH regulator, the indicator, the complexing agent, the masking agent and the solvent are 45%, 1%, 5%, 1% and 48% respectively.

[0096] The pH regulator is ammonium chloride.

[0097] The indicator is chrome black T.

[0098] The complexing agent is ethylenediaminetetraacetic acid disodium salt (EDTA-2Na).

[0099] The masking agent is L-cysteine.

[0100] The solvent is ethylene glycol amine.

[0101] Example Twelve

[0102] The composite hardness analysis reagent described in the present application comprises ammonium chloride, diethanolamine, acid chrome blue K, EDTA-2Na, triethanolamine, ethylene glycol and diethanolamine, wherein the mass fractions of ammonium chloride, diethanolamine, acid chrome blue K, EDTA-2Na, triethanolamine, ethylene glycol and diethanolamine are 15.0%, 52.5%, 1.0%, 0.5%, 1.0%, 20.0% and 10.0% respectively.

[0103] Example Thirteen

[0104] The composite hardness analysis reagent comprises a pH adjusting agent, an indicator, a complexing agent, a masking agent and a solvent.

[0105] Further, the mass percentages of the pH adjusting agent, the indicator, the complexing agent, the masking agent and the solvent are 67%, 1%, 1%, 1% and 30% respectively.

[0106] Further, the pH adjusting agent is a mixture of ammonium chloride and ethanolamine in any proportion.

[0107] Further, the indicator is a mixture of chrome black T and acid chrome blue K in any proportion.

[0108] Further, the complexing agent is ethylenediaminetetraacetic acid disodium salt.

[0109] Further, the masking agent is L-cysteine.

[0110] Further, the solvent is ethylene glycol.

[0111] Example Fourteen

[0112] The composite hardness analysis reagent comprises a pH adjusting agent, an indicator, a complexing agent, a masking agent and a solvent.

[0113] Further, the mass percentages of the pH adjusting agent, the indicator, the complexing agent, the masking agent and the solvent are 67%, 1%, 1%, 1% and 30% respectively.

[0114] Further, the pH adjusting agent is ethanolamine.

[0115] Further, the indicator is chrome black T.

[0116] Further, the complexing agent is disodium ethylenediaminetetraacetate.

[0117] Further, the masking agent is triethanolamine.

[0118] Further, the solvent is ethylene glycol.

[0119] Example Fifteen

[0120] The present example discloses a composite hardness analysis reagent, which comprises a pH adjusting agent, an indicator, a complexing agent, a masking agent and a solvent.

[0121] Further, the mass percentages of the pH adjusting agent, the indicator, the complexing agent, the masking agent and the solvent are 67%, 1%, 1%, 1% and 30% respectively.

[0122] Further, the pH adjusting agent is a mixture of ammonium chloride and ethanolamine in any ratio.

[0123] Further, the indicator is a mixture of chrome black T and acid chrome blue K in any ratio.

[0124] Further, the complexing agent is disodium ethylenediaminetetraacetate.

[0125] Further, the masking agent is L-cysteine.

[0126] Further, the solvent is diethanolamine.

[0127] Example Sixteen

[0128] The present example discloses a composite hardness analysis reagent, which comprises a pH adjusting agent, an indicator, a complexing agent, a masking agent and a solvent.

[0129] Further, the mass percentages of the pH adjusting agent, the indicator, the complexing agent, the masking agent and the solvent are 67%, 1%, 1%, 1% and 30% respectively.

[0130] Further, the pH adjusting agent is a mixture of ammonium chloride and ethanolamine in any ratio.

[0131] Further, the indicator is chrome black T.

[0132] Further, the complexing agent is disodium ethylenediaminetetraacetate.

[0133] Further, the masking agent is triethanolamine.

[0134] Further, the solvent is ethylene glycol.

[0135] Example Seventeen

[0136] The embodiment discloses a composite hardness analysis reagent, which comprises a pH regulator, an indicator, a complexing agent, a masking agent and a solvent.

[0137] Further, the mass percentages of the pH regulator, the indicator, the complexing agent, the masking agent and the solvent are 67%, 1%, 1%, 1% and 30% respectively.

[0138] Further, the pH regulator is ethanolamine.

[0139] Further, the indicator is acid chrome blue K.

[0140] Further, the complexing agent is ethylenediamine tetraacetic acid disodium salt.

[0141] Further, the masking agent is triethanolamine.

[0142] Further, the solvent is diethanolamine.

[0143] Embodiment eighteen

[0144] The embodiment discloses a composite hardness analysis reagent, which comprises a pH regulator, an indicator, a complexing agent, a masking agent and a solvent.

[0145] Further, the mass percentages of the pH regulator, the indicator, the complexing agent, the masking agent and the solvent are 67%, 1%, 1%, 1% and 30% respectively.

[0146] Further, the pH regulator is ammonium chloride.

[0147] Further, the indicator is chrome black T.

[0148] Further, the complexing agent is ethylenediamine tetraacetic acid disodium salt.

[0149] Further, the masking agent is L-cysteine.

[0150] Further, the solvent is ethylene glycol.

[0151] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0152] It is to be understood that the application is not limited to the precise construction herein described and illustrated in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope thereof. The scope of the application is limited only by the claims that follow.

[0153] The above merely provides the preferred embodiment of the present application, and is not intended to limit the present application. Any simple modification, change, and equivalent structural change made according to the technical essence of the present application to the above embodiment shall still fall within the protection scope of the technical scheme of the present application.

Claims

1. A composite hardness analysis reagent, characterized by, The pH regulator, the indicator, the complexing agent, the masking agent and the solvent.

2. The composite hardness assay reagent according to claim 1, wherein, The mass percentages of the pH regulator, the indicator, the complexing agent, the masking agent and the solvent are 40%-67.5%, 0.3%-2.0%, 0.5%-29.2%, 0.5%-1% and 30%-50% respectively.

3. The composite hardness assay reagent of claim 1, wherein The pH regulator is one or a mixture of both of ammonium chloride and ethanolamine in any proportion.

4. The composite hardness assay reagent of claim 1, wherein The indicator is one or a mixture of both of chrome black T and acid chrome blue K in any proportion.

5. The composite hardness assay reagent of claim 1, wherein The complexing agent is disodium salt of ethylenediaminetetraacetic acid.

6. The composite hardness assay reagent of claim 1, wherein The masking agent is L-cysteine or triethanolamine.

7. The composite hardness assay reagent of claim 1, wherein The solvent is ethylene glycol or diethanolamine.

8. The composite hardness assay reagent of claim 1, wherein, The pH regulator, the indicator, the complexing agent, the masking agent and the solvent are ammonium chloride, ethanolamine, chrome black T, EDTA-2Na, L-cysteine and diethanolamine, wherein the mass percentages of ammonium chloride, ethanolamine, chrome black T, EDTA-2Na, L-cysteine and diethanolamine are 7.5%, 44.0%, 0.5%, 3.5%, 1.0% and 43.0% respectively.

9. The composite hardness assay reagent of claim 1, wherein The pH regulator, the indicator, the complexing agent, the masking agent and the solvent are ammonium chloride, diethanolamine, chrome black T, EDTA-2Na and triethanolamine, wherein the mass percentages of ammonium chloride, diethanolamine, chrome black T, EDTA-2Na and triethanolamine are 9.5%, 52.0%, 1.0%, 3.5% and 35.0% respectively.

10. A composite hardness assay reagent, characterized by, The pH regulator, the indicator, the complexing agent, the masking agent and the solvent are ammonium chloride, diethanolamine, acid chrome blue K, EDTA-2Na, triethanolamine, ethylene glycol and diethanolamine, wherein the mass percentages of ammonium chloride, diethanolamine, acid chrome blue K, EDTA-2Na, triethanolamine, ethylene glycol and diethanolamine are 15.0%, 52.5%, 1.0%, 0.5%, 1.0%, 20.0% and 10.0% respectively.

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