CN110873781A - Method for measuring content of hydrazine nitrate in single push-3 - Google Patents
Method for measuring content of hydrazine nitrate in single push-3 Download PDFInfo
- Publication number
- CN110873781A CN110873781A CN201911262737.XA CN201911262737A CN110873781A CN 110873781 A CN110873781 A CN 110873781A CN 201911262737 A CN201911262737 A CN 201911262737A CN 110873781 A CN110873781 A CN 110873781A
- Authority
- CN
- China
- Prior art keywords
- sample
- sodium hydroxide
- solution
- hydrazine nitrate
- content
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
Landscapes
- 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 measuring the content of hydrazine nitrate in single push-3, which comprises the following steps: adding a single push-3 sample into pure water to obtain a solution to be measured, and weighing the sample by using a decrement method to obtain the mass m of the sample; adding acetone into the solution to be detected, and fully and uniformly stirring; dropwise adding sodium hydroxide standard titration solution into the solution to be detected by using an automatic potentiometric titrator, and recording the volume V of the sodium hydroxide standard titration solution consumed until the titration end point1(ii) a Adding neutral formaldehyde into the solution to be detected, and fully and uniformly stirring; dropwise adding sodium hydroxide standard titration solution by using an automatic potentiometric titrator, and recording the volume V of the sodium hydroxide standard titration solution consumed until the titration end point2(ii) a According to the formula
And (3) calculating the content omega of the hydrazine nitrate in the sample, wherein C is the concentration of the sodium hydroxide standard titration solution. The invention also discloses a method for preparing the productSimple process, short reaction time, accurate identification of the test end point and wide application prospect.
Description
Technical Field
The invention relates to the field of liquid propellants, in particular to a method for measuring the content of hydrazine nitrate in a liquid propellant standard substance single push-3.
Background
Single propellant-3 is a novel low freezing point single-component propellant. It is composed of anhydrous hydrazine, hydrazine nitrate, ammonia and water according to a certain proportion. Can work normally at minus 30 ℃, has high density and good low-temperature starting performance, can save or simplify a heating and heat-insulating device, lightens the structural weight and improves the reliability of the system.
The content of hydrazine nitrate in the single push-3 can effectively control the quality of the propellant. At present, the traditional chemical capacity analysis method Q/Sd11-92 is widely adopted in the determination of the content of the hydrazine nitrate in the single push-3. The method has the advantages of low analysis efficiency, toxic gas release in the analysis process, easy human error caused by visual measurement judgment of the titration end point and the titration volume, small color difference of the titration end point of single push-3, more titration steps, and difficult achievement of analysis precision by adopting the traditional chemical analysis method.
In the existing report, the content of the monopropyl-3 component is measured by adopting a potentiometric titration method, but the content of the hydrazine nitrate cannot be directly and independently measured, the measuring steps are various, and the time consumption is long.
Disclosure of Invention
The invention aims to provide a method for measuring the content of hydrazine nitrate in single push-3, which can effectively measure the content of hydrazine nitrate in single push-3, and has the advantages of few measuring steps and short time consumption.
In order to achieve the aim, the invention provides a method for measuring the content of hydrazine nitrate in single push-3, which comprises the following steps:
a sampling step: adding a single push-3 sample into pure water to obtain a solution to be measured, and weighing the sample by using a decrement method to obtain the mass m of the sample;
a first sample processing step: adding acetone into the solution to be detected, and fully and uniformly stirring;
a first titration step: dropwise adding sodium hydroxide standard titration solution into the solution to be detected by using an automatic potentiometric titrator, and recording the volume V of the sodium hydroxide standard titration solution consumed until the titration end point1；
A second sample processing step: adding neutral formaldehyde into the solution to be detected, and fully and uniformly stirring;
a second titration step: dropwise adding sodium hydroxide standard titration solution by using an automatic potentiometric titrator, and recording the volume V of the sodium hydroxide standard titration solution consumed until the titration end point2；
Calculating the content of hydrazine nitrate: the hydrazine nitrate content ω in the sample was calculated according to the following formula:
in the formula: c-concentration of sodium hydroxide standard titration solution, mol/L;
V1volume of sodium hydroxide standard titration solution consumed after addition of acetone, mL;
V2-volume of sodium hydroxide standard titration solution consumed after addition of neutral formaldehyde, mL;
0.09506-hydrazine nitrate conversion coefficient,
m-sample mass, g.
Preferably, in the sampling step, pure water is filled in a beaker, a sample is sucked up by a syringe, the mass of the syringe is weighed, the syringe is pushed to add the sample into the beaker, the mass of the syringe is weighed again, and the difference between the two times of weighing is taken as the sample mass.
Preferably, the adding amount of the pure water is 20-80 mL.
Preferably, the mass of the sample is 0.2-0.5 g.
Preferably, in the first sample processing step, the acetone is an analytically pure reagent, and the addition amount is 3-7 mL.
Preferably, in the second sample processing step, the pH value of the formaldehyde is 8.00, and the addition amount of the formaldehyde is 0.5-2 mL.
Preferably, the concentration of the sodium hydroxide standard titration solution is 0.1022 mol/L.
According to the technical method, the method can effectively measure the content of the hydrazine nitrate in the single-prediction-3, has simple measuring steps, short reaction time and accurate test endpoint identification, and has wide application prospect.
Drawings
FIG. 1 is a titration curve diagram of titration to an endpoint by sodium hydroxide standard solution according to the method for measuring the content of hydrazine nitrate in single push-3 in accordance with one embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a method for measuring the content of hydrazine nitrate in single push-3, which is used for measuring the content of the hydrazine nitrate in the single push-3 of a liquid propellant standard substance by an automatic potentiometric titration method.
In the method for measuring the content of hydrazine nitrate in single push-3 of the embodiment, hydrazine nitrate, acetone and formaldehyde are subjected to condensation reaction to generate hydrazone, oxazine and nitric acid, sodium hydroxide standard titration solution is used for titration, and nitric acid generated by the neutralization reaction is neutralized, and the reaction principle is as follows:
HNO3+NaOH＝NaNO3+H2O
the method for measuring the content of hydrazine nitrate in single push-3 in the embodiment comprises the following steps of sampling, first sample processing, first titration, second sample processing, second titration and hydrazine nitrate content calculation:
(1) a sampling step: pure water is injected into the beaker, and the adding amount of the pure water can be 20-80 mL. The long needle syringe sucks a sample, the surface of the needle is wiped clean, the needle is sealed by a silica gel pad, and the syringe mass is weighed. Taking off the silica gel pad, immersing the needle head into the pure water in the beaker, pushing the injector to add the sample, wiping the surface of the needle head, sealing the needle head by using the silica gel pad, and weighing the mass of the injector again. The difference between the two weighings was taken as the sample mass. The sample was thus weighed by a subtractive method, giving the mass of the sample added to the beaker. The sample amount is, for example, 0.2 to 0.5 g.
(2) A first sample processing step: and adding 3-7 mL of acetone into the beaker containing the sample, fully stirring, and reacting to generate nitric acid. The acetone is an analytically pure reagent.
(3) A first titration step: and (3) titrating the solution to be detected to the end point by using a sodium hydroxide standard titration solution through an automatic potentiometric titrator, and recording the volume V1 of the consumed sodium hydroxide standard titration solution. Specifically, the titration endpoint can be measured using dynamic potentiometry (DET U) as shown in fig. 1. The volume of the sodium hydroxide standard titration solution in abscissa increases with the continuous addition of the sodium hydroxide standard titration solution. Due to the chemical reaction, the potential measured by the electrode changes continuously, and the potential represented by the ordinate decreases continuously. A sudden jump in potential occurs near the equivalence point (EP 1). The endpoint can be automatically identified according to the change of the potential in the titration process.
(4) A second sample processing step: to the solution, 0.5 to 2mL of neutral formaldehyde (pH 8.00) was added and sufficiently stirred.
(5) A second titration step: the solution to be tested is titrated to the end point by an automatic potentiometric titrator by using a sodium hydroxide standard titration solution, the titration end point can be automatically identified in the same way as the figure 1,recording the volume V of sodium hydroxide consumption standard titration solution2。
(6) A calculation step: calculating the hydrazine nitrate content omega in the sample to be detected:
in the formula: c-concentration of sodium hydroxide standard titration solution, mol/L;
V1-the volume of sodium hydroxide standard titration solution, mL, consumed after addition of acetone;
V2-the volume of the sodium hydroxide standard titration solution, mL, after addition of neutral formaldehyde;
0.09506-hydrazine nitrate conversion coefficient,
m-sample mass, g.
In the method for measuring the content of hydrazine nitrate in single push-3 according to the present embodiment, the concentration of the sodium hydroxide standard titration solution may be 0.1022 mol/L.
The above embodiments of the present invention will be further illustrated with reference to specific examples, wherein the raw materials used in the examples are conventional raw materials and commercially available products.
Example 1
60mL of pure water was poured into a 100mL beaker. The 1mL syringe sucks the sample, wipes off the residual sample outside the needle, and the needle is sealed with a silica gel pad. The syringe, sample and silica gel pad were weighed to a mass of 3.5733 g. The silica gel pad was removed and the needle was submerged in pure water in the beaker and the syringe was pushed to add the sample. Wiping off residual solution outside the needle head, and sealing the needle head with a silica gel pad. The syringe, sample and silica gel pad were weighed to a mass of 3.2372 g. The sample was weighed by the subtractive method and the mass of the added sample was 0.3361 g. Adding 4mL of acetone, fully stirring, titrating to an end point by using a sodium hydroxide standard titration solution through an automatic potentiometric titrator, and measuring the volume V of consumed sodium hydroxide18.3133 mL. Adding 0.5mL of neutral formaldehyde, titrating to an end point by an automatic potentiometric titrator by using a sodium hydroxide standard titration solution, and measuring the volume V of consumed sodium hydroxide20.1768 mL. Wherein the electrode used is a non-aqueous composite electrode. According to the formula
And calculating the content omega of the hydrazine nitrate in the sample to be detected to be 24.83%. From the beginning of titration of the sodium hydroxide solution to the completion of titration, the consumption time is 5 min.
In the formula: c, the concentration of the sodium hydroxide standard titration solution is 0.1022, mol/L;
V1-the volume of the sodium hydroxide standard titration solution, mL, is consumed after addition of acetone;
V2-the volume of the sodium hydroxide standard titration solution, mL, is consumed after the neutral formaldehyde is added;
0.09506-conversion coefficient of hydrazine nitrate,
m is sample mass, g.
Example 2
80mL of pure water was poured into a 100mL beaker. The 1mL syringe sucks the sample, wipes off the residual sample outside the needle, and the needle is sealed with a silica gel pad. The syringe, sample and silica gel pad were weighed to a mass of 3.6423 g. The silica gel pad was removed and the needle was submerged in pure water in the beaker and the syringe was pushed to add the sample. Wiping off residual solution outside the needle head, and sealing the needle head with a silica gel pad. The syringe, sample and silica gel pad were weighed to a mass of 3.3967 g. The sample was weighed by the subtractive method and the mass of the added sample was 0.2456 g. Then adding 5mL of acetone, fully stirring, titrating to an end point by using a sodium hydroxide standard titration solution through an automatic potentiometric titrator, and measuring the volume V of the consumed sodium hydroxide16.0976 mL. Adding 1mL of neutral formaldehyde, titrating to an end point by using a sodium hydroxide standard titration solution, and consuming the volume V of sodium hydroxide20.0946 mL. Wherein the electrode used is a non-aqueous composite electrode. According to the formula
And calculating the content omega of the hydrazine nitrate in the sample to be detected to be 24.89%. From the beginning of titration of the sodium hydroxide solution to the completion of titration, the consumption time is 5 min.
In the formula: c, the concentration of the sodium hydroxide standard titration solution is 0.1022, mol/L;
V1-the volume of the sodium hydroxide standard titration solution, mL, is consumed after addition of acetone;
V2-the volume of the sodium hydroxide standard titration solution, mL, is consumed after the neutral formaldehyde is added;
0.09506-conversion coefficient of hydrazine nitrate,
m is sample mass, g.
Example 3
80mL of pure water was poured into a 100mL beaker. The 1mL syringe sucks the sample, wipes off the residual sample outside the needle, and the needle is sealed with a silica gel pad. The syringe, sample and silica gel pad were weighed to a mass of 3.5896 g. The silica gel pad was removed and the needle was submerged in pure water in the beaker and the syringe was pushed to add the sample. Wiping off residual solution outside the needle head, and sealing the needle head with a silica gel pad. The syringe, sample and silica gel pad were weighed to a mass of 3.2891 g. The sample was weighed by the subtractive method and the mass of the added sample was 0.3005 g. 5mL of acetone was added, stirred well and titrated to the end point by an automated potentiometric titrator using a standard titration solution of sodium hydroxide, the volume of sodium hydroxide consumed V1 was 7.4451 mL. Adding 1.5mL of neutral formaldehyde, titrating to an end point by an automatic potentiometric titrator by using a sodium hydroxide standard titration solution, and measuring the volume V of consumed sodium hydroxide20.1506 mL. Wherein the electrode used is a non-aqueous composite electrode. According to the formula
And calculating the content omega of the hydrazine nitrate in the sample to be detected to be 24.88 percent. From the beginning of titration of the sodium hydroxide solution to the completion of titration, the consumption time is 5 min.
In the formula: the concentration of the sodium hydroxide standard titration solution is 0.1022, mol/L;
V1-the volume of the sodium hydroxide standard titration solution, mL, is consumed after addition of acetone;
V2-the volume of the sodium hydroxide standard titration solution, mL, is consumed after the neutral formaldehyde is added;
0.09506-conversion coefficient of hydrazine nitrate,
m is sample mass, g.
Example 4
70mL of pure water was poured into a 100mL beaker. The 1mL syringe sucks the sample, wipes off the residual sample outside the needle, and the needle is sealed with a silica gel pad. The syringe, sample and silica gel pad were weighed to a mass of 3.7008 g. The silica gel pad was removed and the needle was submerged in pure water in the beaker and the syringe was pushed to add the sample. Wiping off residual solution outside the needle head, and sealing the needle head with a silica gel pad. The syringe, sample and silica gel pad were weighed to a mass of 3.3114 g. The sample was weighed by the subtractive method and the mass of the added sample was 0.3894 g. Then adding 5mL of acetone, fully stirring, titrating to an end point by using a sodium hydroxide standard titration solution through an automatic potentiometric titrator, and measuring the volume V of the consumed sodium hydroxide19.6477 mL. Adding 1mL of neutral formaldehyde, titrating to an end point by an automatic potentiometric titrator by using a sodium hydroxide standard titration solution, and measuring the volume V of consumed sodium hydroxide2It was 0.2166 mL. Wherein the electrode used is a non-aqueous composite electrode. According to the formula
And calculating the content omega of the hydrazine nitrate in the sample to be detected to be 24.86 percent. From the beginning of titration of the sodium hydroxide solution to the completion of titration, the consumption time is 5 min.
In the formula: c, the concentration of the sodium hydroxide standard titration solution is 0.1022, mol/L;
V1-the volume of the sodium hydroxide standard titration solution, mL, is consumed after addition of acetone;
V2-the volume of the sodium hydroxide standard titration solution, mL, is consumed after the neutral formaldehyde is added;
0.09506-conversion coefficient of hydrazine nitrate,
m is sample mass, g.
Example 5
60mL of pure water was poured into a 100mL beaker. The 1mL syringe sucks the sample, wipes off the residual sample outside the needle, and the needle is sealed with a silica gel pad. The syringe, sample and silica gel pad were weighed to a mass of 3.5925 g. Taking off the silica gel pad, immersing the needle in the pure water in the beaker, and pushing the syringe to add the sampleAnd (5) preparing the product. Wiping off residual solution outside the needle head, and sealing the needle head with a silica gel pad. The syringe, sample and silica gel pad were weighed to a mass of 3.3089 g. The sample was weighed by the subtractive method and the mass of the added sample was 0.2836 g. Adding 3mL of acetone, fully stirring, titrating to an end point by using a sodium hydroxide standard titration solution through an automatic potentiometric titrator, and measuring the volume V of consumed sodium hydroxide17.0293 mL. Adding 0.5mL of neutral formaldehyde, titrating to an end point by an automatic potentiometric titrator by using a sodium hydroxide standard titration solution, and measuring the volume V of consumed sodium hydroxide20.1336 mL. Wherein the electrode used is a non-aqueous composite electrode. According to the formula
And calculating the content omega of the hydrazine nitrate in the sample to be detected to be 24.88 percent. From the beginning of titration of the sodium hydroxide solution to the completion of titration, the consumption time is 5 min.
In the formula: c, the concentration of the sodium hydroxide standard titration solution is 0.1022, mol/L;
V1-the volume of the sodium hydroxide standard titration solution, mL, is consumed after addition of acetone;
V2-the volume of the sodium hydroxide standard titration solution, mL, is consumed after the neutral formaldehyde is added;
0.09506-conversion coefficient of hydrazine nitrate,
m is sample mass, g.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.
Claims (7)
1. A method for measuring the content of hydrazine nitrate in single push-3 is characterized by comprising the following steps:
a sampling step: adding a single push-3 sample into pure water to obtain a solution to be measured, and weighing the sample by using a decrement method to obtain the mass m of the sample;
a first sample processing step: adding acetone into the solution to be detected, and fully and uniformly stirring;
a first titration step: dropwise adding sodium hydroxide standard titration solution into the solution to be detected by using an automatic potentiometric titrator, and recording the volume V of the sodium hydroxide standard titration solution consumed until the titration end point1；
A second sample processing step: adding neutral formaldehyde into the solution to be detected, and fully and uniformly stirring;
a second titration step: dropwise adding sodium hydroxide standard titration solution by using an automatic potentiometric titrator, and recording the volume V of the sodium hydroxide standard titration solution consumed until the titration end point2；
Calculating the content of hydrazine nitrate: the hydrazine nitrate content ω in the sample was calculated according to the following formula:
in the formula: c-concentration of sodium hydroxide standard titration solution, mol/L;
V1volume of sodium hydroxide standard titration solution consumed after addition of acetone, mL;
V2the volume of the sodium hydroxide standard titration solution consumed after addition of neutral formaldehyde, mL;
0.09506-hydrazine nitrate conversion coefficient,
m-sample mass, g.
2. The single push-3 hydrazine nitrate content measurement method according to claim 1, wherein in the sampling step, pure water is injected into a beaker, a sample is sucked up by a syringe, the mass of the syringe is weighed, the syringe is pushed to the beaker to add the sample, the mass of the syringe is weighed again, and the difference between the two times of weighing is taken as the sample mass.
3. The method for determining the content of hydrazine nitrate in single push-3 according to claim 2, wherein the addition amount of pure water is 20-80 mL.
4. The method for determining the content of hydrazine nitrate in single push-3 according to any one of claims 1 to 3, wherein the mass of the sample is 0.2 to 0.5 g.
5. The method for determining the content of hydrazine nitrate in single push-3 according to any one of claims 1 to 4, wherein in the first sample treatment step, the acetone is an analytically pure reagent, and the addition amount is 3 to 7 mL.
6. The method for determining the content of hydrazine nitrate in single push-3 according to any one of claims 1 to 5, wherein in the second sample treatment step, the pH value of the formaldehyde is 8.00, and the addition amount of the formaldehyde is 0.5 to 2 mL.
7. The method for determining the content of hydrazine nitrate in single push-3 according to any one of claims 1 to 6, wherein the concentration of the sodium hydroxide standard titration solution is 0.1022 mol/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911262737.XA CN110873781B (en) | 2019-12-10 | 2019-12-10 | Method for measuring content of hydrazine nitrate in single push-3 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911262737.XA CN110873781B (en) | 2019-12-10 | 2019-12-10 | Method for measuring content of hydrazine nitrate in single push-3 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110873781A true CN110873781A (en) | 2020-03-10 |
| CN110873781B CN110873781B (en) | 2022-04-01 |
Family
ID=69717729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911262737.XA Active CN110873781B (en) | 2019-12-10 | 2019-12-10 | Method for measuring content of hydrazine nitrate in single push-3 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110873781B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102788765A (en) * | 2012-08-13 | 2012-11-21 | 中国原子能科学研究院 | Determination method of hydrazinium mononitrate and hydroxylamine nitrate |
| CN109856221A (en) * | 2017-11-30 | 2019-06-07 | 中国科学院大连化学物理研究所 | On-line monitoring system that is a kind of while detecting hydrazine nitrate, hydroxylamine nitrate |
-
2019
- 2019-12-10 CN CN201911262737.XA patent/CN110873781B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102788765A (en) * | 2012-08-13 | 2012-11-21 | 中国原子能科学研究院 | Determination method of hydrazinium mononitrate and hydroxylamine nitrate |
| CN109856221A (en) * | 2017-11-30 | 2019-06-07 | 中国科学院大连化学物理研究所 | On-line monitoring system that is a kind of while detecting hydrazine nitrate, hydroxylamine nitrate |
Non-Patent Citations (7)
| Title |
|---|
| R.D.DWIGGINS ET AL.: "Investigation of mixtures of hydrazine,hydrazine nitrate and water", 《CONFIDENTIAL NAVORD REPORT》 * |
| 伍朝胜 等: "硝酸肼镍含量测定方法探讨", 《爆破器材》 * |
| 张有智 等: "自动电位滴定法分析液体推进剂单推三的研究", 《化学分析计量》 * |
| 曹希 等: "容量法测定硝酸肼和 U(Ⅳ)", 《核化学与放射化学》 * |
| 胡立荣 等: "单推三分析化验误差来源研究", 《宇航计测技术》 * |
| 邹展 等: "核废水中硝酸肼、硝酸羟胺的分析方法", 《工业用水与废水》 * |
| 邹展 等: "电位滴定法测硝酸肼", 《中国材料进展》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110873781B (en) | 2022-04-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106290334B (en) | The chemistry in detecting of cobalt and manganese content in cobalt manganese raw material | |
| CN103954617B (en) | Method for detecting content of lithium carbonate | |
| CN102539426A (en) | Method for determining phosphorus in silicon-manganese alloy | |
| CN106802318A (en) | A kind of assay method of hydrated cement paste chlorion fixed amount | |
| KR20130076700A (en) | Method for measuring hf content in lithium secondary battery electrolyte and analytical reagent composition used in the same | |
| CN107796912A (en) | The method for measurement of concentration of mixed acid solution | |
| CN110873781B (en) | Method for measuring content of hydrazine nitrate in single push-3 | |
| CN103776953A (en) | Determination method of content of cobalt in lithium battery ternary positive electrode material | |
| CN201429441Y (en) | Aluminium powder-evolved gas measurement apparatus | |
| CN112881587A (en) | Method and device for jointly measuring concentrations of free acid and divalent tin in electrotinning solution | |
| CN113008808A (en) | Method for detecting nickel, cobalt, manganese and sulfate radicals in precursor of ternary cathode material | |
| EP0285628B1 (en) | Method for determination of total carbonate content especially in biological fluids | |
| CN102608280B (en) | Stabilizer for measuring content of total sugar and reducing sugar by direct titration method and preparation method of stabilizer | |
| CN110702847A (en) | Method for quickly measuring sulfate radical content of vanadium battery electrolyte through temperature titration | |
| Berezin et al. | Practical limitations in determining vegetable oil acid values by a novel pH-metric method | |
| CN102087243A (en) | Method for measuring acid value of deep-color resin through potentiometric titration | |
| CN110487954B (en) | Sulfate radical detection method | |
| CN108645961B (en) | Method for measuring iodine content in feed raw materials | |
| CN102393417B (en) | Analytical method for mercuric chloride | |
| CN103592411A (en) | Method for testing capsule core release amount of concrete chemical self-repair microcapsule | |
| CN102944554A (en) | Rapid paraformaldehyde content measuring method | |
| CN111141730B (en) | Method for measuring iron content in gadolinium-iron alloy | |
| JPS59142462A (en) | Continuous quantitative analysis of total acid and total amino acid | |
| CN108982748A (en) | In a kind of measurement ethylene cracker in mixed ammonium/alkali solutions mixed base method | |
| CN117405820A (en) | Rapid detection method for betaine synthesis reaction progress |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |