CN111879891A - Method for rapidly determining content of sulfite in industrial sulfuric acid - Google Patents
Method for rapidly determining content of sulfite in industrial sulfuric acid Download PDFInfo
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- CN111879891A CN111879891A CN202010625160.0A CN202010625160A CN111879891A CN 111879891 A CN111879891 A CN 111879891A CN 202010625160 A CN202010625160 A CN 202010625160A CN 111879891 A CN111879891 A CN 111879891A
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Abstract
The invention particularly relates to a method for rapidly determining the content of sulfite in industrial sulfuric acid, which belongs to the technical field of chemical analysis and detection and comprises the following steps: taking an industrial sulfuric acid sample with the mass m, and preparing to-be-detected solution; titrating the solution to be measured by adopting a closed titration device to obtain the volume V of the standard titration solution consumed at the titration end point; setting a blank test group to obtain the volume V of the standard titration solution consumed at the end point of titration0(ii) a According to m, V and V0Obtaining the content of sulfite radical in the industrial sulfuric acid; the closed titration apparatus comprises: the rubber plug is tightly plugged at the opening of the conical flask; the glass gas-guide tube and the burette respectively penetrate through the rubber plug to enable one end of the glass gas-guide tube to extend into the conical flask, and are respectively used for introducing nitrogen and discharging oxygen and titrating solution in the conical flask; the magnetic stirrer is positioned at the bottom of the conical flask and is used for stirring the solution in the conical flask.
Description
Technical Field
The invention belongs to the technical field of chemical analysis and detection, and particularly relates to a method for rapidly determining the content of sulfite in industrial sulfuric acid.
Background
The high sulfite content of industrial sulfuric acid is one of the main factors which leads to undesirable color, especially reddening of the sulfuric acid. The chromaticity of industrial sulfuric acid is an important detection index in the current national standard, and the index is taken as one of delivery indexes, and the failure of the index means that the sulfuric acid cannot be delivered from a factory. The common color incompatibility mainly refers to the phenomenon that sulfuric acid generates redness, blackness or greenness. The redness of sulfuric acid is caused by the reduction of selenious acid dissolved in sulfuric acid to amorphous selenium due to the reducibility of sulfite, and the selenium is scarlet. Therefore, the content of the sulfite in the sulfuric acid is analyzed by optimizing the detection technology of the sulfite in the industrial sulfuric acid, and the precipitation of the red amorphous selenium can be controlled, so that the color incompatibility of the sulfuric acid is avoided.
The domestic and foreign standards and literature have been reported to a lesser extent concerning the determination of sulphite in industrial sulphuric acid, of which Japanese Industrial Standard JIS K1322-1980, proposed more than thirty years ago, and national Standard GBT11198.12-1989, prepared with reference to this goal, have been abandoned and no new alternative standard has been issued. Among them, GBT11198.12-1989, iodine content determination for sulfur dioxide content in industrial sulfuric acid, relates to the determination of sulfur dioxide content in industrial sulfuric acid. Sulfur dioxide is linked to the determination of sulfite. However, the method has two major limitations, namely high lower limit of detection and poor measurement precision, and can not meet the current detection requirements.
Disclosure of Invention
In view of the above problems, the present invention has been made in order to provide a method for rapid determination of the sulfite content in industrial sulfuric acid that overcomes or at least partially solves the above problems.
The embodiment of the invention provides a method for rapidly determining the content of sulfite in industrial sulfuric acid, which comprises the following steps:
taking an industrial sulfuric acid sample with the mass m, and preparing to-be-detected solution;
titrating the solution to be measured by adopting a closed titration device to obtain the volume V of the standard titration solution consumed at the titration end point;
setting a blank test group to obtain the volume V of the standard titration solution consumed at the end point of titration0；
According to m, V and V0Obtaining the content of sulfite radical in the industrial sulfuric acid;
the closed titration apparatus comprises: the rubber plug is tightly plugged at the opening of the conical flask; the glass gas-guide tube and the burette respectively penetrate through the rubber plug to enable one end of the glass gas-guide tube to extend into the conical flask, and are respectively used for introducing nitrogen and discharging oxygen and titrating solution in the conical flask; the magnetic stirrer is positioned at the bottom of the conical flask and is used for stirring the solution in the conical flask.
Optionally, the number of the glass air ducts is two, one of the glass air ducts is an air inlet duct, the other glass air duct is an air outlet duct, the air inlet duct is immersed in the liquid in the conical flask but does not touch the magnetic stirrer in operation, and the air outlet duct is not in contact with the liquid in the conical flask.
Optionally, the step of taking an industrial sulfuric acid sample with mass m and preparing the industrial sulfuric acid sample into a solution to be detected includes:
preparing a sodium sulfite standard solution, a potassium iodate standard titration solution and a starch-potassium iodide indicator;
adding the sodium sulfite standard solution into a measuring container for bottoming, and adding water for dilution to obtain a diluted bottoming solution;
taking an industrial sulfuric acid sample with the mass m, adding the industrial sulfuric acid sample under a shaking condition, and then adding a starch-potassium iodide indicator to prepare a solution to be detected.
Optionally, the mass concentration of the sodium sulfite standard solution is 1.00 mg/mL.
Optionally, the preparation method of the sodium sulfite standard solution comprises the following steps:
drying the anhydrous sodium sulfite of the guaranteed reagent to a constant volume, cooling to room temperature, weighing 1.0000g of anhydrous sodium sulfite, dissolving with a proper amount of water, transferring into a 1000mL volumetric flask, fixing the volume with water, and mixing uniformly to obtain a sodium sulfite standard solution.
Optionally, the KIO in the potassium iodate standard titration solution3The molar concentration of (b) is 0.00026 mol/L.
Optionally, the preparation method of the potassium iodate standard titration solution comprises the following steps:
drying potassium iodate to constant weight at 178-182 ℃, then weighing 0.1113g, dissolving with a proper amount of water, then transferring into a 2000mL volumetric flask, fixing the volume with water, and mixing uniformly to obtain a standard titration solution of potassium iodate.
Optionally, the preparation method of the starch-potassium iodide indicator comprises the following steps:
weighing 2.0g of soluble starch, adding a small amount of water to prepare paste, adding 50mL of boiling water, heating and boiling under stirring, keeping for 1min after boiling, and cooling to obtain a starch solution;
weighing 4.0g of potassium iodide, and dissolving the potassium iodide in 10mL of water to obtain a potassium iodide solution;
and mixing the starch solution and the potassium iodide solution, diluting the mixture to 100mL by using water, and uniformly mixing to obtain the starch-potassium iodide indicator.
Optionally, the method includes the steps of adopting a closed titration apparatus to titrate the solution to be measured, and obtaining the volume V of the standard titration solution consumed at the titration end point, including:
adding the potassium iodate standard titration solution into the burette by adopting a closed titration device, and adjusting to zero point;
turning on a magnetic stirring switch, and enabling a magnetic stirrer in the conical flask to rotate at a constant speed;
and introducing nitrogen, after emptying oxygen, titrating the solution to be measured by using a potassium iodate standard titration solution, titrating to light blue to be a titration end point, continuously introducing nitrogen in the whole titration process to avoid air from entering, and obtaining the volume V of the standard titration solution consumed at the titration end point.
Optionally, said terms m, V and V0Obtaining the sulfite content in the industrial sulfuric acid, comprising:
m, V and V0Substituting the formula into the following formula to obtain the content of the sulfite in the industrial sulfuric acid, wherein the formula comprises the following steps:
in the formula (I), the compound is shown in the specification,
Wso3 -2represents the mass fraction of sulfite in%;
c represents the concentration of the standard titration solution of potassium iodate, and the unit is mol/L;
v represents the volume of the potassium iodate standard titration solution consumed by the titration test solution, and the unit is milliliter mL;
V0the volume of the potassium iodate standard titration solution consumed in the blank test is expressed in mL;
80 represents the molar mass of sulfite in grams per mole g/mol;
3, the ratio of the sulfite radical to the potassium iodate in the reaction equation is expressed and is dimensionless;
m represents the amount of sample in grams g.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
1) the method for rapidly determining the content of the sulfite in the industrial sulfuric acid provided by the embodiment of the invention considers the detection limit of an experimental method, primes the pre-quantitative sulfite in the solution to be detected, overcomes the problem of system error when the content of the sulfite is low, and enlarges the detection lower limit.
2) The method optimizes the precision of the experimental method, designs a set of closed titration device, and effectively avoids the risk of low analysis result caused by oxidation of sulfite.
3) To ensure operability of the titration unit in a closed apparatus, the titration endpoint is not shifted from the equivalence point by electromagnetic stirring.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of a method for rapidly determining the content of sulfite in industrial sulfuric acid according to an embodiment of the present invention;
FIG. 2 is a schematic view of a closed titration apparatus for rapid determination of sulfite content in industrial sulfuric acid according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the titration process for rapid determination of sulfite content in industrial sulfuric acid in an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods. As used herein, "water" generally refers to deionized water that meets the "deionized water GB national standard".
As an exemplary embodiment of the present invention, there is provided a method for rapidly determining a sulfite content in industrial sulfuric acid, as shown in fig. 1, the method comprising:
s1, taking an industrial sulfuric acid sample with the mass m, and preparing to obtain a solution to be detected;
s2, titrating the solution to be measured by adopting a closed titration device to obtain the volume V of the standard titration solution consumed at the titration end point;
s3, setting a blank test group, and obtaining the volume V of the standard titration solution consumed at the end point of titration0；
S4 according to m, V and V0Obtaining the content of sulfite radical in the industrial sulfuric acid;
the closed titration apparatus comprises: the rubber plug is tightly plugged at the opening of the conical flask; the glass gas-guide tube and the burette respectively penetrate through the rubber plug to enable one end of the glass gas-guide tube to extend into the conical flask, and are respectively used for introducing nitrogen and discharging oxygen and titrating solution in the conical flask; the magnetic stirrer is positioned at the bottom of the conical flask and is used for stirring the solution in the conical flask.
Example 1
The cone was washed, 5mL of sulfite standard solution (1.00mg/mL) was added, water was added to 200mL, and a 2g sample of industrial sulfuric acid (weighed to the nearest 0.0001g) was added slowly while shaking the body. 5mL of starch-potassium iodide indicator was added, and a magnetic stir bar was added. The experimental set-up was installed (see figure 2). The conical flask is arranged above the magnetic stirrer, and a rubber plug is tightly plugged at the mouth of the conical flask. The rubber plug is respectively connected with two glass air ducts (one air inlet and one air outlet) and a burette. The air inlet pipe is connected with nitrogen, and the height of the air inlet pipe is controlled to be completely submerged in liquid but not to touch the magnetic stirrer in operation. Adding a standard potassium iodate titration solution into the burette, adjusting to zero, vertically extending the burette into the rubber plug, and fixing the conical bottle and the burette by a titration frame. And turning on the magnetic stirring switch, and enabling the magnetic stirrer in the conical flask to rotate at a constant speed. After the oxygen was evacuated, the solution was titrated to light blue with 0.00026mol/L potassium iodate standard titration solution as the titration end point. The magnetic stirring was turned off and the nitrogen was turned off.
Samples 1#, 2#, 3# and 4# are test groups, and sample 5# is a blank group.
The sulfite was measured as shown in Table 1.
TABLE 1 example of analysis of sulfite in industrial sulfuric acid from a plant
| 1# | 2# | 3# | 4# | 5# | |
| Sulfite content w (%) | 0.0011 | 0.0007 | 0.0012 | 0.0009 | 0.087 |
As can be seen from Table 1, the sulfite content in the sulfuric acid samples No. 1, No. 2, No. 3 and No. 4 was 0.001, and the results of the colorimetric detection were acceptable. The practice proves that the production conditions of batches of sulfuric acid of 1#, 2#, 3#, and 4# are stable.
The sulfite content in the 5# sulfuric acid sample reaches 0.087, the chromaticity detection result is unqualified, and the practice proves that the 5# sulfuric acid production is abnormal.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for rapidly determining the content of sulfite in industrial sulfuric acid is characterized by comprising the following steps:
taking an industrial sulfuric acid sample with the mass m, and preparing to-be-detected solution;
titrating the solution to be measured by adopting a closed titration device to obtain the volume V of the standard titration solution consumed at the titration end point;
setting a blank test group to obtain the volume V of the standard titration solution consumed at the end point of titration0；
According to m, V and V0Obtaining the content of sulfite radical in the industrial sulfuric acid;
the closed titration apparatus comprises: the rubber plug is tightly plugged at the opening of the conical flask; the glass gas-guide tube and the burette respectively penetrate through the rubber plug to enable one end of the glass gas-guide tube to extend into the conical flask, and are respectively used for introducing nitrogen and discharging oxygen and titrating solution in the conical flask; the magnetic stirrer is positioned at the bottom of the conical flask and is used for stirring the solution in the conical flask.
2. The method for rapidly determining the content of the sulfite in the industrial sulfuric acid according to claim 1, wherein the number of the glass gas guide tubes is two, one of the glass gas guide tubes is an air inlet tube, the other glass gas guide tube is an air outlet tube, the air inlet tube is immersed in the liquid in the conical flask but does not touch a magnetic stirrer in operation, and the air outlet tube is not in contact with the liquid in the conical flask.
3. The method for rapidly determining the content of sulfite in industrial sulfuric acid according to claim 1, wherein the step of taking a mass m of industrial sulfuric acid sample and preparing the industrial sulfuric acid sample into a solution to be determined comprises the following steps:
preparing a sodium sulfite standard solution, a potassium iodate standard titration solution and a starch-potassium iodide indicator;
adding the sodium sulfite standard solution into a measuring container for bottoming, and adding water for dilution to obtain a diluted bottoming solution;
taking an industrial sulfuric acid sample with the mass m, adding the industrial sulfuric acid sample under a shaking condition, and then adding a starch-potassium iodide indicator to prepare a solution to be detected.
4. The method for rapidly determining the content of sulfite in industrial sulfuric acid according to claim 3, wherein the mass concentration of the standard solution of sodium sulfite is 1.00 mg/mL.
5. The method for rapidly determining the content of sulfite in industrial sulfuric acid according to claim 3 or 4, wherein the preparation method of the sodium sulfite standard solution is as follows:
drying the anhydrous sodium sulfite of the guaranteed reagent to a constant volume, cooling to room temperature, weighing 1.0000g of anhydrous sodium sulfite, dissolving with a proper amount of water, transferring into a 1000mL volumetric flask, fixing the volume with water, and mixing uniformly to obtain a sodium sulfite standard solution.
6. The method for rapidly determining the content of sulfite in industrial sulfuric acid as claimed in claim 3, wherein the KIO in the potassium iodate standard titration solution3The molar concentration of (b) is 0.00026 mol/L.
7. The method for rapidly determining the content of sulfite in industrial sulfuric acid according to claim 3 or 6, wherein the potassium iodate standard titration solution is prepared by the following method:
drying potassium iodate to constant weight at 178-182 ℃, then weighing 0.1113g, dissolving with a proper amount of water, then transferring into a 2000mL volumetric flask, fixing the volume with water, and mixing uniformly to obtain a standard titration solution of potassium iodate.
8. The method for rapidly determining the content of sulfite in industrial sulfuric acid according to claim 3, wherein the starch-potassium iodide indicator is prepared by the following steps:
weighing 2.0g of soluble starch, adding a small amount of water to prepare paste, adding 50mL of boiling water, heating and boiling under stirring, keeping for 1min after boiling, and cooling to obtain a starch solution;
weighing 4.0g of potassium iodide, and dissolving the potassium iodide in 10mL of water to obtain a potassium iodide solution;
and mixing the starch solution and the potassium iodide solution, diluting the mixture to 100mL by using water, and uniformly mixing to obtain the starch-potassium iodide indicator.
9. The method for rapidly determining the content of sulfite in industrial sulfuric acid according to claim 1, wherein the titrating the solution to be determined by using a closed titration apparatus to obtain the volume V of the standard titration solution consumed at the titration endpoint comprises:
adding the potassium iodate standard titration solution into the burette by adopting a closed titration device, and adjusting to zero point;
turning on a magnetic stirring switch, and enabling a magnetic stirrer in the conical flask to rotate at a constant speed;
and introducing nitrogen, after emptying oxygen, titrating the solution to be measured by using a potassium iodate standard titration solution, titrating to light blue to be a titration end point, continuously introducing nitrogen in the whole titration process to avoid air from entering, and obtaining the volume V of the standard titration solution consumed at the titration end point.
10. The method for rapidly determining the content of sulfite in industrial sulfuric acid according to claim 1, wherein the values are in terms of m, V and V0Obtaining the sulfite content in the industrial sulfuric acid, comprising:
m, V and V0Substituting the formula into the following formula to obtain the content of the sulfite in the industrial sulfuric acid, wherein the formula comprises the following steps:
in the formula (I), the compound is shown in the specification,
Wso3 -2representing the mass fraction of sulfite in%;
c, representing the concentration of the standard titration solution of potassium iodate, wherein the unit is mol/L;
v, the volume of the potassium iodate standard titration solution consumed by the titration test solution is expressed in milliliter (mL);
V0the volume of the potassium iodate standard titration solution consumed in the blank test is expressed in mL;
m, representing the amount of sample in grams g.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114894960A (en) * | 2022-05-25 | 2022-08-12 | 重庆康普化学工业股份有限公司 | Method for detecting KOH moisture content |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6010664A (en) * | 1993-07-12 | 2000-01-04 | The Babcock & Wilcox Company | Oxidation detection for sulfite/sulfate systems |
| CN101609078A (en) * | 2009-07-16 | 2009-12-23 | 武汉钢铁(集团)公司 | The method of full iron in a kind of fast measuring sulfate slag |
| CN102879452A (en) * | 2012-09-21 | 2013-01-16 | 贵州红林机械有限公司 | Method for determining content of micro chlorine ions in surface treatment solution |
| CN103698328A (en) * | 2013-12-31 | 2014-04-02 | 中国农业科学院柑桔研究所 | Reducing sugar direct titration method capable of improving titration accuracy |
| CN103776820A (en) * | 2012-10-24 | 2014-05-07 | 北京有色金属与稀土应用研究所 | Method for measuring copper content in tin-silver-copper solder through iodometry |
| CN206725497U (en) * | 2017-05-16 | 2017-12-08 | 安徽出入境检验检疫局检验检疫技术中心 | A kind of automatics with concentration of reduced sugar in Food by Potentiometric Titration |
| CN108489978A (en) * | 2018-03-22 | 2018-09-04 | 长春黄金研究院有限公司 | The assay method of total sulfur in a kind of cyanating solution |
| CN109115940A (en) * | 2018-10-22 | 2019-01-01 | 北京科技大学 | A kind of iodine number method measuring oxygen vacancy concentration in bismuth ferrite based leadless piezoelectric ceramics |
-
2020
- 2020-06-30 CN CN202010625160.0A patent/CN111879891A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6010664A (en) * | 1993-07-12 | 2000-01-04 | The Babcock & Wilcox Company | Oxidation detection for sulfite/sulfate systems |
| CN101609078A (en) * | 2009-07-16 | 2009-12-23 | 武汉钢铁(集团)公司 | The method of full iron in a kind of fast measuring sulfate slag |
| CN102879452A (en) * | 2012-09-21 | 2013-01-16 | 贵州红林机械有限公司 | Method for determining content of micro chlorine ions in surface treatment solution |
| CN103776820A (en) * | 2012-10-24 | 2014-05-07 | 北京有色金属与稀土应用研究所 | Method for measuring copper content in tin-silver-copper solder through iodometry |
| CN103698328A (en) * | 2013-12-31 | 2014-04-02 | 中国农业科学院柑桔研究所 | Reducing sugar direct titration method capable of improving titration accuracy |
| CN206725497U (en) * | 2017-05-16 | 2017-12-08 | 安徽出入境检验检疫局检验检疫技术中心 | A kind of automatics with concentration of reduced sugar in Food by Potentiometric Titration |
| CN108489978A (en) * | 2018-03-22 | 2018-09-04 | 长春黄金研究院有限公司 | The assay method of total sulfur in a kind of cyanating solution |
| CN109115940A (en) * | 2018-10-22 | 2019-01-01 | 北京科技大学 | A kind of iodine number method measuring oxygen vacancy concentration in bismuth ferrite based leadless piezoelectric ceramics |
Non-Patent Citations (3)
| Title |
|---|
| 中华人民共和国国家质量监督检验检疫总局、中国国家标准化管理委员会: "GB/T 6730.17-2014 铁矿石 硫含量的测定 燃烧碘量法", 《GB/T 6730.17-2014 铁矿石 硫含量的测定 燃烧碘量法》 * |
| 吴世敏 等: "简明精细化工大辞典", 《简明精细化工大辞典》 * |
| 张穗忠 等: "电感耦合等离子体原子发射光谱法测量萤石中硫含量", 《武汉工程职业技术学院学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114894960A (en) * | 2022-05-25 | 2022-08-12 | 重庆康普化学工业股份有限公司 | Method for detecting KOH moisture content |
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