CN103336089A - Simple calibrating method of sodium thiosulfate standard solution - Google Patents
Simple calibrating method of sodium thiosulfate standard solution Download PDFInfo
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- CN103336089A CN103336089A CN2013102336173A CN201310233617A CN103336089A CN 103336089 A CN103336089 A CN 103336089A CN 2013102336173 A CN2013102336173 A CN 2013102336173A CN 201310233617 A CN201310233617 A CN 201310233617A CN 103336089 A CN103336089 A CN 103336089A
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- standard solution
- sodium thiosulfate
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- titration
- available chlorine
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Abstract
The invention discloses a simple calibrating method of a sodium thiosulfate standard solution, which is used for quickly determining available chlorine content in a chlorine-containing disinfectant and chlorine dioxide. The invention belongs to the field of chemical analysis. The method comprises the following steps: titrating a prepared sodium thiosulfate standard solution by using a substance with known or unknown available chlorine concentratio and an original sodium thiosulfate standard solution, and calculating the concentration of the standard solution by the iodimetric principle. Compared with the sodium thiosulfate standard volumetric solution calibrating method in Chinese Standard GB/T601-2002, the result difference of the method disclosed by the invention does not exceed 1%, and thus, the method disclosed by the invention can be used for testing available chlorine concentration with low accuracy requirements. The invention simplifies the analysis procedure, and thus, quickly obtains the result; the invention reduces the types of reagents, thereby lowering the analysis cost; the invention avoids using heavy metal chemicals and carcinogens, thereby eliminating heavy metal pollution and carcinogen threat; the error is small, and thus, the invention is suitable for testing available chlorine content in the product with low accuracy requirements, and is especially suitable for terminal users in need of testing available chlorine products.
Description
Technical field
The present invention relates to a kind of simple calibrating method of sodium thiosulfate standard solution, belong to the chemical analysis field.The test of the product available chlorine content that suitable accuracy requirement is not really high is particularly suited for the terminal user that need are tested the product of available chlorine content.
Background technology
The people of modern society take chlorine-containing agent more or chlorine dioxide is implemented bleaching and virus killing, and available chlorine content is a primary index of this type of product efficacy of check.When analyzing effective chlorine, need prepare and demarcate the 0.1mol/L sodium thiosulfate standard solution, the scaling method of regulation sodium thiosulfate standard titration solution among the GB GB/T601-2002, method requires to demarcate with dry and constant weight 0.54g primary standard reagent potassium bichromate, but in this calibration process, potassium dichromate also is discharged and enters sewer.Potassium dichromate (K
2Cr
2O
7) be not only a heavy metal species, the strong oxidizer of carcinogenicity is still arranged, incorporated into by international cancer research institution (IARC) and be first kind carcinogen.The discharging of potassium dichromate is administered for local environment and to be brought heavy burden.
Each chlorine-containing disinfectant of China and chlorine dioxide production factory, agent and terminal user will detect available chlorine content, all to carry out the demarcation of hypo solution, for serialization production, can need more standard solution, adopt the operation of GB prescriptive procedure, need to consume many relatively potassium dichromates.
Seeking the alternative method of demarcating sodium thiosulfate standard solution, do not re-use potassium dichromate and demarcate, can simplify calibrating procedure, eliminate heavy metal pollution, again away from the threat of cancer material, is present urgent problem.
Summary of the invention
The invention provides a kind of simple calibrating method of sodium thiosulfate standard solution, in order to simplify procedures, separate removing heavy metals and cancer material and pollute.The present invention is enlightened by effective Determination Method of Chlorine, utilizes the material of known effective chlorine density to return a standard solution to be measured, calculates the concentration of standard solution thus; Perhaps use batch preparation, demarcate the standard solution that do not use up and the standard solution of following batch of concentration to be measured for preparing by state, the material of the unknown effective chlorine density of titration, the volume of two kinds of standard solution that contrast consumes also can calculate concentration of standard solution to be measured.
The present invention realizes with following technical scheme: a kind of simple calibrating method of sodium thiosulfate standard solution, the statement of its principle, instrument, reagent, analytical procedure, analysis result is identical substantially with the method for iodometric determination effective chlorine.It utilizes the material of known available chlorine content or the chemicals of original sodium thiosulfate standard solution and a unknown available chlorine content, by titration and then calculate the actual concentrations of this standard solution.
The material of described known available chlorine content is that available chlorine content is not less than 60% and the material of stable performance.
Further, described available chlorine content is not less than 60% material and comprises that available chlorine content is 60% calcium hypochlorite, 60% sodium dichloro cyanurate and 90% sym-closene.
The reaction principle of above-mentioned simple calibrating method is: in acid medium, iodine is separated out in the hypochlorite that chlorine-containing disinfectant decomposites and potassium iodide reaction.Be indicator with starch, with the chlorine-containing disinfectant titration sodium thiosulfate standard solution to be measured (or the material of the unknown available chlorine content difference original sodium thiosulfate standard solution of titration and sodium thiosulfate standard solution to be measured) of known effective chlorine density, the blue disappearance is terminal point.Reaction equation is as follows:
OCl
-+2I
-+?2H
+→H
2O+Cl
-+I
2
I
2+2S
2O
3 2-→S
4O
6 2-+2I
-
Described instrument and reagent: general experimental apparatus.Liquor kalii iodide, 100g/L; Sulfuric acid solution, 3+100.Measure 30mL sulfuric acid, slowly inject 1000mL water, cooling shakes up; Known effective chlorine density 60%-91% chlorine-containing disinfectant; Soluble starch solution, 10g/L.
The analytical procedure of described simple and easy method: the preparation of (1) sample solution: the material or the original sodium thiosulfate standard solution that take by weighing the known available chlorine content of 3.5g, place mortar, grinding is homogeneous latex emulsion, all moves in the 500mL volumetric flask then, be diluted with water to scale, shake up.(2) measure: draw the 25.00mL sample solution, place the port grinding bottle of band plug, add 20mL liquor kalii iodide and 10mL sulfuric acid solution.After in the dark placing 5min, to faint yellow, add the 1mL starch indicator with the titration of sodium thiosulfate standard titration solution, then solution is blue, continues titration again and is terminal point to blue the disappearance, and record consumes liquor capacity.The arithmetic mean of getting twice mensuration is measurement result, and the difference of twice measurement result is not more than 0.3%.
The computing formula of described analysis result: with the material titration standard solution to be measured of known effective chlorine density, computing formula is C=Xm/70.90V.C is the actual concentrations of sodium thiosulfate standard titration solution in the formula, mol/L; X is the effective chlorine density of chlorine-containing disinfecting material; M is the quality of sample, g; V is the volume of the sodium thiosulfate standard titration solution of titration consumption, mL; 70.90 be reduction coefficient.If with the original standard solution of material titration of unknown effective chlorine density and the standard solution of concentration to be measured, computing formula is C
1=C
0[1-(V
1-V
0)/V
0].C in the formula
1Concentration for sodium thiosulfate standard solution to be measured; C
0Concentration for original standard solution; V
0Be the liquor capacity that consumes with the original standard solution of the material titration of unknown effective chlorine density; V
1Drip the liquor capacity of the standard solution consumption of concentration to be measured for the material with unknown effective chlorine density.
The invention has the beneficial effects as follows: simplify routine analyzer, know the result fast; Reduce the agents useful for same kind, reduce analysis cost; Avoid using the chemicals with heavy metal and carcinogenicity, eliminate heavy metal pollution and cancer material and threaten; Error is less, is fit to the test to the not really high product available chlorine content of accuracy requirement, needing to be particularly suited for the terminal user of test effective chlorine product.
Embodiment
Further specify below in conjunction with the present invention of embodiment and effect.
Described instrument and reagent: general experimental apparatus.Liquor kalii iodide, 100g/L; Sulfuric acid solution, 3+100.Measure 30mL sulfuric acid, slowly inject 1000mL water, cooling shakes up; Known effective chlorine density 60%-91% chlorine-containing disinfectant (or sodium thiosulfate standard solution of last consignment of time preparation and definite concentration); Soluble starch solution, 10g/L.
Embodiment 1:
Take by weighing 26g sodium thiosulfate (Na
2S
2O
35H
2O) or the 16g Sodium Thio Sulphate(Anhydrous), add the 0.2g natrium carbonicum calcinatum, be dissolved in the 1000mL water, slowly boil the 10min cooled and filtered, to be calibrated.
Taking by weighing available chlorine content is the about 3.5g sample of 90.53% TCCA product (being accurate to 0.0002g), places mortar, grinds to be homogeneous latex emulsion, all moves in the 500mL volumetric flask then, is diluted with water to scale, shakes up.Draw the 25.00mL sample solution, place the port grinding bottle of band plug, add 20mL liquor kalii iodide and 10mL sulfuric acid solution.After in the dark placing 5min, to faint yellow, add the 1mL starch indicator with the titration of sodium thiosulfate standard titration solution, then solution is blue, continues titration again and is terminal point to blue the disappearance, and record consumes liquor capacity.Getting the arithmetic mean of measuring solution for twice is measurement result, and the difference of twice measurement result is not more than 0.3%.Used standard solution volume is 22.44mL, the substitution computing formula: C=X m/70.90V=90.53%*3.5/(70.90*22.44)=1.0030, namely this sodium thiosulfate standard solution concentration is 1.0030ml/L.
Embodiment 2:
Take by weighing 26g sodium thiosulfate (Na
2S
2O
35H
2O) or the 16g Sodium Thio Sulphate(Anhydrous), add the 0.2g natrium carbonicum calcinatum, be dissolved in the 1000mL water, slowly boil the 10min cooled and filtered, to be calibrated.
Take by weighing the about 3.5g sample of DCCNa product (being accurate to 0.0002g) of unknown available chlorine content, place mortar, grinding is homogeneous latex emulsion, all moves in the 500mL volumetric flask then, is diluted with water to scale, shakes up.Draw the 25.00mL sample solution, place the port grinding bottle of band plug, add 20mL liquor kalii iodide and 10mL sulfuric acid solution.After in the dark placing 5min, use the sodium thiosulfate standard solution of 1.0328ml/L and sodium thiosulfate standard solution volumetric soiutions to be calibrated to faint yellow respectively, add the 1mL starch indicator, then solution is blue, continue titration again and be terminal point to blue the disappearance, record consumes liquor capacity respectively.Getting the arithmetic mean of measuring solution for twice is measurement result, and the difference of twice measurement result is not more than 0.3%.Used standard solution volume is 21.04mL and 20.70mL, substitution computing formula: C
1=C
0[1-(V
1-V
0)/V
0]=1.0328*[1-(20.70-21.04)/21.04=1.0494, namely this sodium thiosulfate standard solution concentration is 1.0494ml/L.
Claims (2)
1. the simple calibrating method of a sodium thiosulfate standard solution, it is characterized in that, it utilizes the material of known available chlorine content or the chemicals of original sodium thiosulfate standard solution and a unknown available chlorine content, by titration and then calculate the actual concentrations of this standard solution; Concrete steps are:
(1) preparation of sample solution: the material or the original sodium thiosulfate standard solution that take by weighing the known available chlorine content of 3.5g place mortar, grind to be homogeneous latex emulsion, all move in the 500mL volumetric flask then, are diluted with water to scale, shake up;
(2) measure: draw the 25.00mL sample solution, place the port grinding bottle of band plug, add 20mL liquor kalii iodide and 10mL sulfuric acid solution; After in the dark placing 5min, to faint yellow, add the 1mL starch indicator with the titration of sodium thiosulfate standard titration solution, then solution is blue, continues titration again and is terminal point to blue the disappearance, and record consumes liquor capacity; The arithmetic mean of getting twice mensuration is measurement result, and the difference of twice measurement result is not more than 0.3%;
The computing formula of described analysis result:
With the material titration standard solution to be measured of known effective chlorine density, computing formula is C=X m/70.90V; In the formula: C is the actual concentrations of sodium thiosulfate standard titration solution, mol/L; X is the effective chlorine density of chlorine-containing disinfecting material; M is the quality of sample, g; V is the volume of the sodium thiosulfate standard titration solution of titration consumption, mL; 70.90 be reduction coefficient;
If with the original standard solution of material titration of unknown effective chlorine density and the standard solution of concentration to be measured, computing formula is: C
1=C
0[1-(V
1-V
0)/V
0]; In the formula: C
1Concentration for sodium thiosulfate standard solution to be measured; C
0Concentration for original standard solution; V
0Be the liquor capacity that consumes with the original standard solution of the material titration of unknown effective chlorine density; V
1Drip the liquor capacity of the standard solution consumption of concentration to be measured for the material with unknown effective chlorine density.
The material of described known available chlorine content is that available chlorine content is not less than 60% and the material of stable performance.
2. the simple calibrating method of a kind of sodium thiosulfate standard solution according to claim 1, it is characterized in that described available chlorine content is not less than 60% material and comprises that available chlorine content is 60% calcium hypochlorite, 60% sodium dichloro cyanurate and 90% sym-closene.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749170A (en) * | 2013-12-31 | 2015-07-01 | 北京有色金属与稀土应用研究所 | Analysis method for determining copper in tin-silver-copper solder through iodometry |
| CN107290475A (en) * | 2016-04-13 | 2017-10-24 | 深圳市博林达科技有限公司 | A kind of preparation method of standard liquid |
| CN113307316A (en) * | 2021-06-18 | 2021-08-27 | 中国人民解放军陆军防化学院 | Decontamination wastewater neutralization treatment composition and use method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58129256A (en) * | 1982-01-28 | 1983-08-02 | Tokuyama Soda Co Ltd | Method of quantitative analysis of stabilized chlorine dioxide |
| CN1106140A (en) * | 1994-06-27 | 1995-08-02 | 武汉市传染病医院 | Quick metering method of active chlorine in disinfectant |
| CN102778533A (en) * | 2012-08-13 | 2012-11-14 | 徐云 | Evaluation screening method and evaluation operating process for chlorine-containing disinfectants |
-
2013
- 2013-06-13 CN CN2013102336173A patent/CN103336089A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58129256A (en) * | 1982-01-28 | 1983-08-02 | Tokuyama Soda Co Ltd | Method of quantitative analysis of stabilized chlorine dioxide |
| CN1106140A (en) * | 1994-06-27 | 1995-08-02 | 武汉市传染病医院 | Quick metering method of active chlorine in disinfectant |
| CN102778533A (en) * | 2012-08-13 | 2012-11-14 | 徐云 | Evaluation screening method and evaluation operating process for chlorine-containing disinfectants |
Non-Patent Citations (3)
| Title |
|---|
| 付华 等: "浅析硫代硫酸钠标准溶液的配制和标定", 《城市建设理论研究（电子版）》 * |
| 付春香 等: "碘酸钾标定硫代硫酸钠及省略标定过程的讨论", 《科学与财富》 * |
| 苏红梅 等: "有效氯含量硫代硫酸钠简易测定方法", 《广西蚕业》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749170A (en) * | 2013-12-31 | 2015-07-01 | 北京有色金属与稀土应用研究所 | Analysis method for determining copper in tin-silver-copper solder through iodometry |
| CN107290475A (en) * | 2016-04-13 | 2017-10-24 | 深圳市博林达科技有限公司 | A kind of preparation method of standard liquid |
| CN113307316A (en) * | 2021-06-18 | 2021-08-27 | 中国人民解放军陆军防化学院 | Decontamination wastewater neutralization treatment composition and use method thereof |
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Application publication date: 20131002 |