CN112526061A - Purity detection method for electronic-grade reagent - Google Patents
Purity detection method for electronic-grade reagent Download PDFInfo
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- CN112526061A CN112526061A CN202011347791.7A CN202011347791A CN112526061A CN 112526061 A CN112526061 A CN 112526061A CN 202011347791 A CN202011347791 A CN 202011347791A CN 112526061 A CN112526061 A CN 112526061A
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- Prior art keywords
- sulfuric acid
- concentrated sulfuric
- reagent
- purity
- acid reagent
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/16—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using titration
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Molecular Biology (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The invention discloses a method for detecting the purity of an electronic-grade reagent, which specifically comprises the following steps: weighing a quantitative concentrated sulfuric acid reagent of 2.0-2.25g, filling the concentrated sulfuric acid reagent into a volumetric flask pre-filled with 200ml of distilled water, and adding water for dilution after cooling to room temperature; step two: using a liquid taking tube to transfer 50ml of diluent into a detection bottle, and adding 4 drops of mixed indicator, wherein the solution is purple red; step three: titrating by using 0.2mol/L sodium hydroxide standard solution to form grayish green, namely the end point; step four: by the formula
Description
Technical Field
The invention relates to the technical field of production of electronic-grade reagents, in particular to a method for detecting the purity of an electronic-grade reagent.
Background
Concentrated sulfuric acid, having the chemical formula H2SO4, is a highly corrosive, strong mineral acid, typically a sulfuric acid solution having a mass fraction of greater than or equal to 70%. Concentrated sulfuric acid has strong oxidizing property at high concentration, and also has dehydrating property, strong corrosivity, difficult volatility, acidity and water absorbability.
In the prior art, the difficulty of detecting the concentration of the concentrated sulfuric acid reagent is relatively high, and the health of an operator is threatened, so that a method capable of accurately detecting the concentration of the concentrated sulfuric acid reagent is needed to be provided for production and use.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the defects in the background technology, the invention discloses a method for detecting the purity of an electronic-grade reagent.
The technical scheme is as follows: a method for detecting the purity of an electronic-grade reagent specifically comprises the following steps,
the method comprises the following steps: weighing a quantitative concentrated sulfuric acid reagent of 2.0-2.25g, filling the concentrated sulfuric acid reagent into a volumetric flask pre-filled with 200ml of distilled water, and adding water for dilution after cooling to room temperature;
step two: using a liquid taking tube to transfer 50ml of diluent into a detection bottle, and adding 4 drops of mixed indicator, wherein the solution is purple red;
step three: titrating by using 0.2mol/L sodium hydroxide standard solution to form grayish green, namely the end point;
step four: by the formula
And calculating the purity of the concentrated sulfuric acid reagent, wherein c is the standard concentration of sodium hydroxide, V is the volume of the consumed sodium hydroxide standard solution, m is the mass of the concentrated sulfuric acid reagent, and 98 is the molar mass of the concentrated sulfuric acid reagent.
In a preferred embodiment of the present invention, the volumetric flask has a capacity of 500 ml.
In a preferred embodiment of the present invention, the mixed indicator is methyl red-methylene blue mixed indicator.
In a preferred embodiment of the present invention, the mixed indicator is methyl red-methylene blue mixed indicator.
In a preferred embodiment of the present invention, the content of the methyl red solution is 4g/L, and the content of the methyl blue solution is 2 g/L.
In a preferred embodiment of the present invention, the concentrated sulfuric acid reagent is weighed by a subtractive method.
The invention realizes the following beneficial effects:
the invention can rapidly detect the concentration of the concentrated sulfuric acid reagent, and has relatively high working efficiency and relatively high detection precision.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
Examples
A method for detecting the purity of an electronic-grade reagent specifically comprises the following steps,
the method comprises the following steps: weighing a quantitative concentrated sulfuric acid reagent of 2.0-2.25g, filling the concentrated sulfuric acid reagent into a volumetric flask pre-filled with 200ml of distilled water, and adding water for dilution after cooling to room temperature;
step two: using a liquid taking tube to transfer 50ml of diluent into a detection bottle, and adding 4 drops of mixed indicator, wherein the solution is purple red;
step three: titrating by using 0.2mol/L sodium hydroxide standard solution to form grayish green, namely the end point;
step four: by the formula
And calculating the purity of the concentrated sulfuric acid reagent, wherein c is the standard concentration of sodium hydroxide, V is the volume of the consumed sodium hydroxide standard solution, m is the mass of the concentrated sulfuric acid reagent, and 98 is the molar mass of the concentrated sulfuric acid reagent.
In this example, the capacity of the volumetric flask is 500 ml.
In this example, the mixed indicator is specifically methyl red-methylene blue mixed indicator.
In this example, the mixed indicator is specifically methyl red-methylene blue mixed indicator.
In this example, the content of methyl red solution was 4g/L and the content of methyl blue solution was 2 g/L.
In this example, concentrated sulfuric acid reagent was weighed by a subtractive method.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (6)
1. The method for detecting the purity of the electronic-grade reagent is characterized by comprising the following steps of,
the method comprises the following steps: weighing a quantitative concentrated sulfuric acid reagent of 2.0-2.25g, filling the concentrated sulfuric acid reagent into a volumetric flask pre-filled with 200ml of distilled water, and adding water for dilution after cooling to room temperature;
step two: using a liquid taking tube to transfer 50ml of diluent into a detection bottle, and adding 4 drops of mixed indicator, wherein the solution is purple red;
step three: titrating by using 0.2mol/L sodium hydroxide standard solution to form grayish green, namely the end point;
step four: by the formula
And calculating the purity of the concentrated sulfuric acid reagent, wherein c is the standard concentration of sodium hydroxide, V is the volume of the consumed sodium hydroxide standard solution, m is the mass of the concentrated sulfuric acid reagent, and 98 is the molar mass of the concentrated sulfuric acid reagent.
2. The method for detecting the purity of an electronic grade reagent according to claim 1, wherein the volumetric flask has a capacity of 500 ml.
3. An electronic grade reagent purity testing method according to claim 1, wherein the mixed indicator is a methyl red-methylene blue mixed indicator.
4. An electronic grade reagent purity testing method according to claim 3, wherein said methyl red-methylene blue mixed indicator is formed by mixing 100mL of methyl red solution and 100mL of methylene blue solution.
5. The method according to claim 4, wherein the methyl red solution is 4g/L, and the methyl blue solution is 2 g/L.
6. The method for detecting the purity of the electronic-grade reagent according to claim 1, wherein the concentrated sulfuric acid reagent is weighed by a subtraction method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011347791.7A CN112526061A (en) | 2020-11-26 | 2020-11-26 | Purity detection method for electronic-grade reagent |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011347791.7A CN112526061A (en) | 2020-11-26 | 2020-11-26 | Purity detection method for electronic-grade reagent |
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| Publication Number | Publication Date |
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| CN112526061A true CN112526061A (en) | 2021-03-19 |
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| CN202011347791.7A Pending CN112526061A (en) | 2020-11-26 | 2020-11-26 | Purity detection method for electronic-grade reagent |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102062736A (en) * | 2010-11-22 | 2011-05-18 | 陕西巨川富万钾股份有限公司 | Method for fast determining contents of nitrogen, phosphorus and potassium in phosphorus-potassium-carbon ammonium |
| CN104215740A (en) * | 2014-09-25 | 2014-12-17 | 河南工信华鑫环保科技有限公司 | Acidity testing method for sulfuric acid solution containing copper and iron |
-
2020
- 2020-11-26 CN CN202011347791.7A patent/CN112526061A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102062736A (en) * | 2010-11-22 | 2011-05-18 | 陕西巨川富万钾股份有限公司 | Method for fast determining contents of nitrogen, phosphorus and potassium in phosphorus-potassium-carbon ammonium |
| CN104215740A (en) * | 2014-09-25 | 2014-12-17 | 河南工信华鑫环保科技有限公司 | Acidity testing method for sulfuric acid solution containing copper and iron |
Non-Patent Citations (1)
| Title |
|---|
| 方勤胜 等: "《硫化染料的生产与检验》", 30 September 1975, 上海人民出版社 * |
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Application publication date: 20210319 |