Burette cleaning solution and cleaning method

Abstract

The invention discloses a burette cleaning solution and a burette cleaning method. The burette cleaning solution is prepared from the following components in percentage by mass: 11.26 percent to 15.77 percent of sodium hydroxide, 69.01 percent to 70.13 percent of absolute ethyl alcohol, 0.11 percent to 0.23 percent of baking soda, 0.11 percent to 0.36 percent of trisodium citrate and 15.77 percent to 18.02 percent of a solvent. The cleaning method comprises the following steps: preparing a cleaning solution; soaking the burette in the cleaning solution; and cleaning the soaked burette. The burette cleaning solution has the beneficial effects that the time for soaking the burette by the cleaning solution is shortened, the labor cost and the economic cost are reduced, the working efficiency is improved, and the use of a chromic acid cleaning solution which is high in operation risk, long in soaking time, serious in environmental pollution and difficult in waste liquid treatment can be effectively avoided; the burette cleaning agent not only can be applied to burette cleaning, but also is suitable for other common glass instruments containing the same pollutants, and also has a very good popularization effect in the same industry.

Description

Technical Field

[0001] The invention relates to a burette cleaning liquid and a cleaning method. Background Art

[0002] At present, the burette is a glass instrument commonly used in laboratories to accurately measure liquids. However, a burette with serious wall adhesion will greatly affect the analysis results of the test. Common contaminants in daily burettes are oil and certain organic matter. According to the nature of the contaminants in the burette, different cleaning solutions can be used to effectively clean the burette glass instrument through chemical or physical effects. The existing technology is that most laboratories have used chromic acid cleaning solution to clean burettes and other commonly used glass instruments. Although the cleaning effect of chromic acid cleaning solution is good, the preparation and use of chromic acid cleaning solution is more dangerous (concentrated sulfuric acid and potassium dichromate must be used in the preparation). For burettes with severe wall adhesion, the soaking time is longer (burettes with severe wall adhesion often need to be soaked for 24 hours). The waste liquid is toxic and difficult to handle and has great harm to the environment. In addition, the chromic acid cleaning solution not only takes a long time to soak, which is time-consuming and labor-intensive, but also the laboratory often needs to spare an equal number of burettes, resulting in higher costs for burettes and identification fees; some cleaning solutions are toxic and flammable organic solvents; some cleaning solutions will undergo violent chemical reactions during the preparation process, releasing a large amount of heat and nitrogen dioxide, and great attention must be paid to safety issues during the operation process; some cleaning solutions are easy to corrode glassware; some cleaning solutions will introduce other pollutants during cleaning, and require secondary treatment with a reducing agent to clean them. Summary of the invention

[0003] The invention discloses a burette cleaning liquid and a cleaning method to solve any of the above and other potential problems in the prior art.

[0004] In order to solve the above technical problems, the technical solution provided by the present invention is: a burette cleaning solution, wherein the mass percentages of the components of the burette cleaning solution are: 11.26% to 15.77% of sodium hydroxide, 69.01% to 70.13% of anhydrous ethanol, 0.11% to 0.23% of baking soda, 0.11% to 0.36% of trisodium citrate, and 15.77% to 18.02% of solvent.

[0005] Furthermore, the solvent is distilled water or deionized water (grade 3 or above).

[0006] Another object of the present invention is to provide a cleaning method using the above-mentioned burette cleaning solution, the cleaning method specifically comprising the following steps:

[0007] S1) preparing a cleaning solution;

[0008] S2) Soak the burette with the cleaning solution prepared in S1):

[0009] S3) cleaning the burette after soaking.

[0010] Further, the specific steps of S1) are:

[0011] S1.1) Weigh sodium hydroxide, anhydrous ethanol, baking soda, trisodium citrate and solvent according to the designed ratio;

[0012] S1.2) First, place sodium hydroxide, baking soda and trisodium citrate in a container, add a solvent and stir continuously to dissolve completely, then add anhydrous ethanol, stir evenly, transfer into a dark plastic reagent bottle, seal it, and let it stand at room temperature for 7-14 days to obtain a cleaning solution.

[0013] Further, the specific steps of S2) are:

[0014] S2.1) Dry the burette to be cleaned and set aside;

[0015] S2.2) Shake the cleaning solution prepared in S1) and pour it into the burette treated in S2.1), then clamp the burette on the titration stand and let it soak for 15 to 30 minutes;

[0016] S2.3) Remove the burette after soaking, pour the washing liquid back into the washing liquid bottle and seal it.

[0017] Further, the specific steps of S3) are:

[0018] S3.1) Rinse the burette inside and out with tap water 7-8 times after pouring out the washing solution, and then rinse the inside of the burette with distilled water or deionized water 1-2 times;

[0019] S3.2) Hang the washed burette upside down on the titration stand, let it stand for 5-10 minutes, and wipe off the moisture on the outer wall of the burette.

[0020] The beneficial effects of the present invention are as follows: due to the adoption of the above technical scheme, the cleaning solution of the present invention not only shortens the time for the cleaning solution to soak the burette, reduces labor and economic costs, but also greatly improves work efficiency. The cleaning solution is safer in preparation and use operation, and has minimal environmental pollution. The preparation and use method of the cleaning solution can be applied not only to the cleaning of the burette, but also to other commonly used glass instruments containing the same pollutants, and also has a good promotion effect in the same industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a flowchart of a method for cleaning a burette cleaning solution. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below by way of examples, but the scope of the present invention is not limited to these examples.

[0023] like Figure 1 As shown, the present invention provides a method for cleaning a burette cleaning fluid, the method comprising the following steps:

[0024] 1.1 Preparation of washing solution, 1.1 The specific process is:

[0025] 1.1.1 First clean the 1% electronic balance, then check the level of the electronic balance, then place a 500mL dry and clean beaker on the electronic balance to remove the skin, then add 50-70g analytical grade sodium hydroxide, 0.5-1.0g baking soda, and 0.5-1.6g trisodium citrate into the beaker. After weighing, remove the beaker and place it on the workbench;

[0026] 1.1.2 Use a 100mL measuring cup or measuring cylinder to measure 70-80mL of distilled water or deionized water and pour it into a 500mL beaker. Then use a glass rod to stir until the baking soda and trisodium citrate are completely dissolved. Then add anhydrous ethanol to the beaker until the 500mL mark on the beaker is reached. Continue to stir evenly with a glass rod. Then put it into a 500mL dark plastic reagent bottle, cover the reagent bottle cap, and attach a reagent preparation label.

[0027] 1.1.3 Store the prepared lotion in a cool and dry place at room temperature in a sealed container. After 7 to 14 days, the lotion will turn reddish brown and be set aside for later use. Remember to shake it well before each use. 1.2 Soak the burette with the lotion. The specific process of 1.2 is as follows:

[0028] 1.2.1 Pour the washing liquid which has been stored for about 7 to 14 days into a dry and clean small beaker;

[0029] 1.2.2 Pour the washing liquid in the small beaker into the entire burette, and then clamp the burette on the titration stand and let it soak for 15 to 30 minutes;

[0030] 1.3 Clean the burette after soaking. The specific process of 1.3 is:

[0031] 1.3.1 Remove the burette after soaking, pour the washing liquid back into the washing liquid bottle, and cover the washing liquid bottle;

[0032] 1.3.2 After pouring the washing solution, immediately rinse the burette inside and out with tap water for about 7 to 8 times until the washing solution is rinsed clean;

[0033] 1.3.3 Rinse the inside of the burette 1 to 2 times with distilled or deionized water;

[0034] 1.3.4 Hang the washed burette upside down on the titration stand and wait for 5-10 minutes until most of the water in the burette is filtered dry, then wipe the small amount of residual water on the surface of the burette with clean filter paper (at this time, you will find that the burette is clean and bright, and there is no wall hanging);

[0035] 1.3.5 Place the cleaned burette in the burette box to prevent dust and other contamination.

[0036] Embodiment 1:

[0037] Prepare 6 burettes with serious wall adhesion and soak them in the newly prepared washing solution according to the above steps for 15 minutes and 24 hours respectively. The results are shown in Table 2 below:

[0038] Table 1 Effects of soaking in the newly prepared lotion for 15 min and 24 h

[0039]

[0040] Summary: Following the above steps and soaking in the newly prepared lotion for 15 minutes or 24 hours respectively did not produce good results.

[0041] Embodiment 2:

[0042] Prepare 18 burettes with serious wall adhesion and soak them in the washing solution prepared for about 7 to 14 days according to the above steps for 5 minutes, 8 minutes, 10 minutes, 15 minutes, 20 minutes and 30 minutes respectively. The results are shown in Table 2 below:

[0043] Table 2 Effects of soaking in the lotion prepared for 7 to 14 days for 5 min, 8 min, 10 min, 15 min, 20 min, and 30 min respectively

[0044]

[0045]

[0046] Summary: According to the above operating steps, soak the burettes in the washing solution prepared about 7 to 14 days ago for 5 minutes, 8 minutes, 10 minutes, 15 minutes, 20 minutes and 30 minutes respectively. The experiment found that the burettes soaked in the washing solution prepared about 7 to 14 days ago for 15 minutes, 20 minutes and 30 minutes can achieve the effect of being clean and transparent without sticking to the wall.

[0047] Embodiment 3:

[0048] Prepare 6 burettes with serious wall adhesion and soak them in the washing solution prepared for about 7 to 14 days according to the above steps for 15 minutes, 20 minutes, and 30 minutes respectively. The results are shown in Table 3 below:

[0049] Table 3 Effects of soaking for 15min, 20min, and 30min respectively with lotion prepared for about 7 to 14 days

[0050]

[0051] Summary: According to the above steps, soak the burettes in the washing solution prepared about 7 to 14 days ago for 15 minutes, 20 minutes, and 30 minutes respectively. The experiment found that the burettes soaked in the washing solution prepared about 7 to 14 days ago can still achieve a clean and bright effect.

[0052] The above is a detailed introduction to a burette cleaning solution and cleaning method provided in the embodiments of the present application. The description of the above embodiments is only used to help understand the method and its core idea of ​​the present application; at the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

[0053] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different nouns to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. As mentioned throughout the specification and claims, "including" and "comprising" are open-ended terms, so they should be interpreted as "including / including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect. The subsequent description of the specification is a preferred embodiment of the present application, but the description is for the purpose of illustrating the general principles of the present application, and is not used to limit the scope of the present application. The scope of protection of the present application shall be determined by the definition of the attached claims.

[0054] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0055] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0056] The above description shows and describes several preferred embodiments of the present application, but as mentioned above, it should be understood that the present application is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the application concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the present application, and should be within the scope of protection of the claims attached to the present application.

Claims

1. A burette cleaning fluid, characterized in that: The mass percentages of the components of the burette cleaning solution are: 11.26% to 15.77% of sodium hydroxide, 69.01% to 70.13% of anhydrous ethanol, 0.11% to 0.23% of baking soda, 0.11% to 0.36% of trisodium citrate, and 15.77% to 18.02% of solvent.

2. The burette cleaning solution according to claim 1, characterized in that: The solvent is distilled water or deionized water.

3. A cleaning method using the burette cleaning solution as claimed in claim 1 or 2, characterized in that: The cleaning method specifically comprises the following steps: S1) preparing a cleaning solution; S2) Soak the burette with the cleaning solution prepared in S1): S3) cleaning the burette after soaking.

4. The cleaning method according to claim 3, characterized in that: The specific steps of S1) are: S1.1) Weigh sodium hydroxide, anhydrous ethanol, baking soda, trisodium citrate and solvent according to the designed ratio; S1.2) First, place sodium hydroxide, baking soda and trisodium citrate in a container, add solvent and continue stirring until completely dissolved, then add anhydrous ethanol, stir evenly, transfer into a dark plastic reagent bottle, seal, and let stand at room temperature for 7-14 days to obtain a cleaning solution.

5. The cleaning method according to claim 3, characterized in that: The specific steps of S2) are: S2.1) Dry the burette to be cleaned and set aside; S2.2) Shake the cleaning solution prepared in S1) and pour it into the burette treated in S2.1), then clamp the burette on the titration stand and let it soak for 15 to 30 minutes; S2.3) Remove the burette after soaking, pour the washing liquid back into the washing liquid bottle and seal it.

6. The cleaning method according to claim 3, characterized in that: The specific steps of S3) are: S3.1) Rinse the burette inside and outside with tap water 7-8 times after pouring out the washing solution, and then rinse the inside of the burette with distilled water or deionized water 1-2 times; S3.2) Hang the washed burette upside down on the titration stand, let it stand for 5-10 minutes, and wipe off the moisture on the outer wall of the burette.

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