CN103954614B - Method for rapidly measuring concentration of sodium persulfate in aqueous solution - Google Patents
Method for rapidly measuring concentration of sodium persulfate in aqueous solution Download PDFInfo
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- CN103954614B CN103954614B CN201410159917.6A CN201410159917A CN103954614B CN 103954614 B CN103954614 B CN 103954614B CN 201410159917 A CN201410159917 A CN 201410159917A CN 103954614 B CN103954614 B CN 103954614B
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Abstract
The invention belongs to the technical field of environmental protection and in particular relates to a method for rapidly measuring the concentration of sodium persulfate in an aqueous solution. The method comprises the following steps: adding a mixed solution of 0.2ml of sodium persulfate, 15ml of KI and NaHCO3 into a conical flask, reacting in a dark place for 15-20 minutes, taking the product out of the conical flask within 20 minutes, adding 1ml of acetic acid, titrating by using sodium thiosulfate until the solution is changed into light yellow, adding a small amount of starch, shaking the flask for uniformly mixing the solution, so that the solution turns into black blue, and continuing to titrate until the solution is clarified; and calculating the mass of contained sodium persulfate in each liter of sample according to a calculation formula.
Description
Technical field
The invention belongs to environmental technology field and in particular in a kind of quick mensure aqueous solution sodium peroxydisulfate concentration side
Method.
Background technology
Directly add liquor kalii iodide in the experimentation of common iodimetric titration survey sodium peroxydisulfate concentration at present, need to be placed in dark place
Reaction just can carry out titration operation after 3 hours, time-consuming long in experiment, less efficient.
The principle of common iodimetric titration and experimental procedure:
(1) experimental principle
Iodine oxidation in potassium iodide can be obtained elemental iodine by sodium peroxydisulfate, then titrates simple substance iodine number with sodium thiosulfate, you can meter
Calculate sodium peroxydisulfate content in sample.
Formula is as follows:
Wherein: the quality of contained sodium peroxydisulfate: g/l in every liter of sample of y；
The molecular weight of m sodium peroxydisulfate: 238.104
The concentration of c sodium thiosulfate standard solution, mol/l；
V sodium thiosulfate standard solution titer, l；
v0The volume of taken sodium peroxydisulfate sample, l.
(2) preparation of solution needed for
0.01mol/l sodium thiosulfate standard solution (on experiment impact maximum, periodic calibrating or purchase)；
10% liquor kalii iodide: 10g potassium iodide is dissolved in 90g deionized water；
1% starch indicator: 1g soluble starch is dissolved in 99g water, is heated to seething with excitement and clarifies, add after cooling
0.125g benzoic acid is anti-corrosion.
(3) experimental procedure
Take appropriate amount of sample (0.2ml) in 100ml conical flask, add 40g deionization water as solvent, shake up, add 10ml
Liquor kalii iodide, covers tightly bottle stopper (now solution becomes orange), dark place is placed 3 hours, is titrated with sodium thiosulfate standard solution, extremely
Light yellow addition 2-3 drips starch indicator (solution turned blue black), be titrated to colourless to terminal.
Content of the invention
It is an object of the invention to provide a kind of method reducing sodium peroxydisulfate concentration in time-consuming quick mensure aqueous solution.
The method of sodium peroxydisulfate concentration in quick mensure aqueous solution proposed by the present invention, specific experiment step is as follows:
(1) prepare solution
Weigh 13.3gki, 3.33gnahco3In the deionized water of 100ml, stirring is until dissolve；
Weigh 2.5gna2s2o3, appropriate chcl3In 1l deionized water, stirring is until dissolve；
Weigh 2.452gk2cr2o7In 0.5l deionized water, stirring, until dissolving, takes 3ml to add 27ml deionized water dilute
Release；
(2) demarcation of sodium thiosulfate
Hypo solution is demarcated using front needs；
The conical flask of 100ml adds in 80ml deionized water, the k that diluted of 1ml sulphuric acid, 10ml2cr2o7、1gki；
Titrated with sodium thiosulfate, until solution is changed into light yellow, add a small amount of starch to make solution be changed into black-and-blue,
Continue titration until solution is clarified；Calculate:
Wherein: the concentration of n sodium thiosulfate standard solution, mol/l；
The concentration of c potassium dichromate, mol/l；
v1The volume of potassium dichromate, l；
v2The titer of sodium thiosulfate standard solution, l；
(3) mensure of sodium peroxydisulfate solution
0.2ml sodium peroxydisulfate, 15mlki and nahco is added in the conical flask of 100ml3Mixed liquor, be put in dark place anti-
Answer 15 ~ 20 minutes；
Add 1ml acetic acid, titrated with sodium thiosulfate, until solution is changed into light yellow, add a small amount of starch to make molten
Liquid is changed into black-and-blue, continues titration until solution is clarified；Calculate:
Wherein: the quality of contained sodium peroxydisulfate: g/l in every liter of sample of y；
The concentration of n sodium thiosulfate standard solution, mol/l；
The molecular weight of m sodium peroxydisulfate: 238.104
V sodium thiosulfate standard solution titer, l；
v0The volume of taken sodium peroxydisulfate sample, l.
It is directly to add liquor kalii iodide in common iodimetric titration, the present invention changes the reagent adding in experiment, by adding
Different reagent, changes the speed that reaction occurs, and improves the efficiency of reaction.
Specific embodiment
Measure the concentration of sodium peroxydisulfate using the present invention, prepare the required solution of experiment first, demarcate sodium thiosulfate
Concentration, then adds 0.2ml sodium peroxydisulfate, 15ml ki and nahco in the conical flask of 100ml3Mixed liquor, be put in dark place
Reaction 15 ~ 20 minutes, after reaction, adds 1ml acetic acid, shakes the bottle and make its mix homogeneously, titrated with sodium thiosulfate, directly
It is changed into light yellow to solution, adds a small amount of starch, shake the bottle and make its mix homogeneously, solution is changed into black-and-blue, continue titration straight
To solution clarification.Following table is 2 examples of present invention mensure sodium peroxydisulfate solution concentration:
Embodiment 1
Table 1:na2s2o8Concentration theoretical value
Table 2: quick iodimetric titration and common iodimetric titration survey na2s2o8Concentration compares
.
Embodiment 2
Table 3:na2s2o8Concentration theoretical value
Table 4: quick iodimetric titration and common iodimetric titration survey na2s2o8Concentration compares
.
The sodium peroxydisulfate concentration that this two quick iodimetric titration of embodiments explanation are surveyed is with theoretical value very close to accuracy is very
Height, and saved the experimental period of nearly 3 hours, improve efficiency.
Claims (1)
1. in a kind of quick mensure aqueous solution the method for sodium peroxydisulfate concentration it is characterised in that specifically comprising the following steps that
(1) prepare solution
Weigh 13.3gki, 3.33gnahco3In the deionized water of 100ml, stirring is until dissolve；
Weigh 2.5gna2s2o3, appropriate chcl3In 1l deionized water, stirring is until dissolve；
Weigh 2.452gk2cr2o7In 0.5l deionized water, stirring, until dissolving, takes 3ml to add the dilution of 27ml deionized water；
(2) demarcation of sodium thiosulfate
Hypo solution is demarcated using front needs；
The k that 80ml deionized water, 1ml sulphuric acid, 10ml diluted is added in the conical flask of 100ml2cr2o7、1gki；
Titrated with sodium thiosulfate, until solution is changed into light yellow, adds a small amount of starch to make solution be changed into black-and-blue, continue
Titration is until solution is clarified；Calculate:
Wherein: the concentration of n sodium thiosulfate standard solution, mol/l；
The concentration of c potassium dichromate, mol/l；
v1The volume of potassium dichromate, l；
v2The titer of sodium thiosulfate standard solution, l；
(3) mensure of sodium peroxydisulfate solution
0.2ml sodium peroxydisulfate, 15mlki and nahco is added in the conical flask of 100ml3Mixed liquor, be put in dark place reaction 15 ~
20 minutes；
Add 1ml acetic acid, titrated with sodium thiosulfate, until solution is changed into light yellow, add a small amount of starch so that solution is become
For black-and-blue, continue titration until solution clarification；Calculate:
Wherein: the quality of contained sodium peroxydisulfate: g/l in every liter of sample of y；
The concentration of n sodium thiosulfate standard solution, mol/l；
The molecular weight of m sodium peroxydisulfate: 238.104；
V sodium thiosulfate standard solution titer, l；
v0The volume of taken sodium peroxydisulfate sample, l.
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| CN106053766B (en) * | 2016-07-27 | 2018-06-26 | 武汉都市环保工程技术股份有限公司 | A kind of method of sodium peroxydisulfate content in quick measure soil |
| CN110749696B (en) * | 2019-12-04 | 2023-04-18 | 上田环境修复有限公司 | Method for detecting residual persulfate in environmental remediation engineering |
| CN110749695B (en) * | 2019-12-04 | 2023-01-17 | 上田环境修复有限公司 | Method for detecting residual medicament in environmental remediation engineering |
Citations (1)
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| CN102890087A (en) * | 2012-11-13 | 2013-01-23 | 宁夏医科大学 | Method for measuring artemisinin content in traditional Chinese medicinal materials such as Artemisia annua and samples containing artemisinin components |
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| JP4299696B2 (en) * | 2004-03-03 | 2009-07-22 | オルガノ株式会社 | Method for measuring persulfate concentration |
| JP2012194166A (en) * | 2011-03-16 | 2012-10-11 | Toyoko Kagaku Co Ltd | Method for measuring concentration of ammonium persulfate solution |
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| CN102890087A (en) * | 2012-11-13 | 2013-01-23 | 宁夏医科大学 | Method for measuring artemisinin content in traditional Chinese medicinal materials such as Artemisia annua and samples containing artemisinin components |
Non-Patent Citations (2)
| Title |
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| 催化碘量法测定钼;郑肇生等;《福州大学学报》;19831231(第4期);第107-115页 * |
| 孟庆云等.铁矿石、还原及焙烧铁矿产物中金属铁和全铁的测定--碘量法.《分析化学》.1980,第8卷(第4期),第390-391页. * |
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