CN102507856A - Peristaltic pump type weighing titrator and titration method thereof - Google Patents
Peristaltic pump type weighing titrator and titration method thereof Download PDFInfo
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- CN102507856A CN102507856A CN201110333635XA CN201110333635A CN102507856A CN 102507856 A CN102507856 A CN 102507856A CN 201110333635X A CN201110333635X A CN 201110333635XA CN 201110333635 A CN201110333635 A CN 201110333635A CN 102507856 A CN102507856 A CN 102507856A
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Abstract
The invention discloses an analytical chemistry instrument, in particular to a peristaltic pump type weighing titrator and a titration method thereof. The titrator comprises a titration unit, a measure and control unit and a weighing bottle. The titration unit comprises a titration tank, a peristaltic pump and capillaries, and an inlet and an outlet of the peristaltic pump are respectively communicated with the weighing bottle and the titration tank through the capillaries. An electrode is installed in the titration tank, an electric signal input end of the measure and control unit is connected with the electrode in the titration tank, and a control output end of the measure and control unit is connected with the peristaltic pump. The peristaltic pump type weighing titrator drives titrating solution through the peristaltic pump, determines titration progress through changes of electrode potentials measured by the measure and control unit, controls the peristaltic pump, acquires mass of the titrating solution through a weighing method, and accordingly improves titration accuracy. Simultaneously, the peristaltic pump type weighing titrator is simple in structure, convenient to use and low in cost, and a titration pipeline is small in volume, so that washing is facilitated.
Description
Technical field
The present invention relates to a kind of analytical chemistry instrument, specifically a kind of peristaltic pump formula weighing titrator and titration method thereof.
Background technology
Analysis by titration is the reagent solution with a kind of known accurate concentration; Be added drop-wise in the solution of measured matter; Up to added reagent and measured matter by till the stoichiometry quantitative reaction, according to the concentration of reagent solution and the amount of consumption, the method for calculating measured matter content.Autotitrator generally adopts the plunger type titration method in the market; Through the potential electrode potential change; Control plunger type automatic buret adds or stops to add vs, according to the step number of stepper motor or the rotation of plunger screw rod, obtains to add the volume of vs.This is a kind of method of volumetry; The restriction and the temperature variant influence of solution density of buret cubing precision but the defective that such method exists is; Volumetric analysis titration repeatability can only reach 0.1%, can't break through to higher titration precision, simultaneously plunger type automatic buret complex structure; Requirement on machining accuracy is high, and cost of manufacture is higher.
Also have some titrators to carry out titration with volume pump, volume pump titration precision is more more than ram pump difference, and this type of titrator is seldom arranged on the market.
Summary of the invention
The technical matters that the present invention will solve provide a kind of easily manufactured, use simple, cost is low, peristaltic pump formula weighing titrator and titration method thereof that the titration precision is high.
In order to solve the problems of the technologies described above; Peristaltic pump formula weighing titrator of the present invention comprises titration unit, measurement and control module and measuring cup; The titration unit comprises titration cell, peristaltic pump and kapillary, and the entrance and exit of peristaltic pump feeds in measuring cup and the titration cell through kapillary respectively; In the said titration cell electrode is installed, measures with the electric signal input end of control module and be connected with electrode in the titration cell, measurement is connected with peristaltic pump with the control output end of control module.
Can also be provided with the speed governing knob on the said peristaltic pump.
Be provided with stirring apparatus in the said titration cell.
A kind of titration method that adopts above-mentioned peristaltic pump formula weighing titrator may further comprise the steps:
(1) in measuring cup, pours earlier volumetric soiutions into, the kapillary that connects the peristaltic pump inlet is immersed be equipped with in the measuring cup of volumetric soiutions, the kapillary that connects the peristaltic pump outlet is fed waste liquid bottle earlier;
(2) the running peristaltic pump makes the volumetric soiutions rinse and is full of plastic capillary and the peristaltic pump pipeline;
(3) kapillary is shifted out measuring cup, the quality of measuring cup that volumetric soiutions is housed is carried out weighing;
(4) in titration cell, pour the solution of measured matter into, the kapillary that connects the peristaltic pump entrance and exit is inserted respectively in measuring cup and the titration cell, the startup peristaltic pump carries out titration,
(5) change control peristaltic pump high speed, low speed, stepping rotation or stop operating through measuring the electrode potential of measuring solution in the titration cell with control module;
(6) when the demonstration of electrode potential signal reaches titration end-point, once more kapillary is shifted out measuring cup, the quality of measuring cup and residual titration solution is carried out weighing, the difference of twice weighing result is the quality that vs consumes.
After adopting above-mentioned structure and method thereof; Drive vs through peristaltic pump,, control peristaltic pump high speed, low speed, stepping rotation or stop operating by measuring the process of confirming titration with control module potential electrode potential change; Adopt the quality of the method acquisition adding vs of weighing; Improve the titration precision, made titration repeatability can reach 0.05%-0.02%, in addition better.Add vs amount can from 1 the gram about to several hectograms, can realize microtitration, constant titration and super quantity titration, along with the increase of vs consumption; The titration precision is higher, and its apparatus structure is simple, easy to use simultaneously; Cost is also lower; The buret appearance of a street is long-pending little, is beneficial to rinse, has reduced the waste of vs; Vs only contacts peristaltic pump pipeline and plastic capillary, does not receive any pollution.
Description of drawings
Fig. 1 is the structural representation of peristaltic pump formula weighing titrator of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, peristaltic pump formula weighing titrator of the present invention and titration method thereof are done further explain.
Embodiment one:
As shown in the figure; Peristaltic pump formula weighing titrator of the present invention comprises titration unit, measurement and control module and measuring cup; The titration unit comprises titration cell 5, peristaltic pump 7 and kapillary 8, and the entrance and exit of peristaltic pump 7 feeds measuring cup 1 and titration cell 5 through kapillary 8 respectively; Electrode 6 is installed in the titration cell 5, measures with the electric signal input end of control module 3 and be connected, enough measure the electrode potential variation of solution in the titration process in the titration cell 5, and then determine whether approaching or reach reaction end so that can survey with electrode 6 in the titration cell.Measurement is connected with peristaltic pump 7 with the control output end of control module 3, can change according to measured electrode potential, according to rotating with approaching extent control peristaltic pump high speed, low speed, the stepping of reaction end or stopping operating.
On the further basis of peristaltic pump formula weighing titrator of the present invention, also be provided with stirring apparatus 4 in the above-mentioned titration cell 5, make vs and tested solvent to stir, stirring apparatus can directly drive and stir or indirect magnetically-actuated stirring.
The titration method of above-mentioned peristaltic pump formula weighing titrator, carry out according to following steps:
(1) in measuring cup, pours earlier volumetric soiutions into, a plastic capillary that connects peristaltic pump is immersed be equipped with in the measuring cup of volumetric soiutions, another root plastic capillary is put into waste liquid bottle;
(2) the running peristaltic pump makes the volumetric soiutions rinse and is full of plastic capillary and the peristaltic pump flexible pipe;
(3) extract plastic capillary, with the measuring cup of electronic balance weighing band bottle cap;
(4) in titration cell, pour the solution of measured matter into, two plastic capillary two ends are inserted respectively carry out titration in measuring cup and the titration cell;
(5) electrode is immersed in the titration cell solution, during titration, change, control peristaltic pump high speed, low speed, stepping rotation or stop operating through measuring the electrode potential of measuring solution in the titration cell with control module;
When (6) reaching titration end-point, extract plastic capillary once more, with electronic balance weighing measuring cup with cover, the difference of twice weighing result is the quality that vs consumes.
Embodiment two:
Can also be provided with speed governing knob (not shown) on the peristaltic pump 7 of peristaltic pump formula weighing titrator of the present invention, when carrying out titrimetry thus, carry out according to following steps:
(1) in measuring cup, pours earlier volumetric soiutions into, a capillary that connects peristaltic pump is immersed be equipped with in the measuring cup of volumetric soiutions, another capillary is put into waste liquid bottle;
(2) the running peristaltic pump makes the volumetric soiutions rinse and is full of plastic capillary and the peristaltic pump flexible pipe;
(3) extract plastic capillary, use the electronic balance weighing measuring cup;
(4) in titration cell, pour the solution of measured matter into, two capillaries are inserted respectively carry out titration in measuring cup and the titration cell;
The indicator that (5) can show the titration process splashes in the titration cell solution, in the titration process according to the titration process rotary peristaltic pump speed governing knob that shows, control peristaltic pump high speed, low speed, stepping rotation or stop operating;
When (6) reaching titration end-point, extract kapillary once more, with electronic balance weighing measuring cup with cover, the difference of twice weighing result is the quality that vs consumes.
Claims (4)
1. peristaltic pump formula weighing titrator; Comprise titration unit, measurement and control module and measuring cup; It is characterized in that: said titration unit comprises titration cell (5), peristaltic pump (7) and kapillary (8), and peristaltic pump (7) entrance and exit feeds in measuring cup (1) and the titration cell (5) through kapillary (8) respectively; Electrode (6) is installed in the said titration cell (5), measures with the electric signal input end of control module (3) and be connected with electrode (6) in the titration cell, measurement is connected with peristaltic pump (7) with the control output end of control module (3).
2. according to the described peristaltic pump formula of claim 1 weighing titrator, it is characterized in that: said peristaltic pump (7) is provided with the speed governing knob.
3. according to claim 1 or 3 described peristaltic pump formula weighing titrators, it is characterized in that: be provided with stirring apparatus (4) in the said titration cell (5).
4. titration method that adopts the said peristaltic pump formula of claim 1 weighing titrator is characterized in that may further comprise the steps:
1) in measuring cup, pours earlier volumetric soiutions into, the kapillary that connects the peristaltic pump inlet is immersed be equipped with in the measuring cup of volumetric soiutions, the kapillary that connects the peristaltic pump outlet is fed waste liquid bottle earlier;
2) the running peristaltic pump makes the volumetric soiutions rinse and is full of plastic capillary and the peristaltic pump pipeline;
3) kapillary is shifted out measuring cup, the quality of measuring cup that volumetric soiutions is housed is carried out weighing;
4) in titration cell, pour the solution of measured matter into, the kapillary that connects the peristaltic pump entrance and exit is inserted respectively in measuring cup and the titration cell, the startup peristaltic pump carries out titration,
5) change control peristaltic pump high speed, low speed, stepping rotation or stop operating through measuring the electrode potential of measuring solution in the titration cell with control module;
6) when the demonstration of electrode potential signal reaches titration end-point, once more kapillary is shifted out measuring cup, the quality of measuring cup and residual titration solution is carried out weighing, the difference of twice weighing result is the quality that vs consumes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110333635XA CN102507856A (en) | 2011-10-28 | 2011-10-28 | Peristaltic pump type weighing titrator and titration method thereof |
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| CN201110333635XA CN102507856A (en) | 2011-10-28 | 2011-10-28 | Peristaltic pump type weighing titrator and titration method thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105181889A (en) * | 2015-09-30 | 2015-12-23 | 王竞 | Liquid analysis method and device adopting potentiometric titration |
| CN105954343A (en) * | 2016-04-26 | 2016-09-21 | 重庆鹏凯精细化工有限公司 | Device for rapid determination of content of sodium chloride in hydroxyethyl/hydroxypropyl methyl cellulose |
| CN106168209A (en) * | 2016-08-23 | 2016-11-30 | 保定雷弗流体科技有限公司 | A kind of intelligent flow bearing calibration for peristaltic pump and system |
| CN106292759A (en) * | 2016-08-15 | 2017-01-04 | 深圳市清时捷科技有限公司 | Velocity control device, automatic titration device and titration control method are dripped in a kind of titration |
| CN106391156A (en) * | 2016-09-29 | 2017-02-15 | 上海化工研究院 | Electrically-controlled dropwise adding system for inductive gravity metering |
| CN106885872A (en) * | 2015-12-15 | 2017-06-23 | 青岛果核仪器科技有限公司 | A kind of smart electronicses acid alkaline titrimeter |
| CN107782843A (en) * | 2016-08-29 | 2018-03-09 | 开平市中青环保技术服务有限公司 | A kind of titer automatic gauge method in titrimetry using photoelectric measurement mode |
| CN111323531A (en) * | 2020-04-22 | 2020-06-23 | 上海昂林科学仪器股份有限公司 | Titration device and titration method for combining speed and speed in automatic titration process |
| CN115792267A (en) * | 2023-01-29 | 2023-03-14 | 山东天元盈康检测评价技术有限公司 | Quantitative titration device and implementation method thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105181889A (en) * | 2015-09-30 | 2015-12-23 | 王竞 | Liquid analysis method and device adopting potentiometric titration |
| CN106885872A (en) * | 2015-12-15 | 2017-06-23 | 青岛果核仪器科技有限公司 | A kind of smart electronicses acid alkaline titrimeter |
| CN105954343A (en) * | 2016-04-26 | 2016-09-21 | 重庆鹏凯精细化工有限公司 | Device for rapid determination of content of sodium chloride in hydroxyethyl/hydroxypropyl methyl cellulose |
| CN106292759A (en) * | 2016-08-15 | 2017-01-04 | 深圳市清时捷科技有限公司 | Velocity control device, automatic titration device and titration control method are dripped in a kind of titration |
| CN106168209A (en) * | 2016-08-23 | 2016-11-30 | 保定雷弗流体科技有限公司 | A kind of intelligent flow bearing calibration for peristaltic pump and system |
| CN106168209B (en) * | 2016-08-23 | 2017-12-15 | 保定雷弗流体科技有限公司 | A kind of intelligent flow bearing calibration and system for peristaltic pump |
| CN107782843A (en) * | 2016-08-29 | 2018-03-09 | 开平市中青环保技术服务有限公司 | A kind of titer automatic gauge method in titrimetry using photoelectric measurement mode |
| CN106391156A (en) * | 2016-09-29 | 2017-02-15 | 上海化工研究院 | Electrically-controlled dropwise adding system for inductive gravity metering |
| CN111323531A (en) * | 2020-04-22 | 2020-06-23 | 上海昂林科学仪器股份有限公司 | Titration device and titration method for combining speed and speed in automatic titration process |
| CN115792267A (en) * | 2023-01-29 | 2023-03-14 | 山东天元盈康检测评价技术有限公司 | Quantitative titration device and implementation method thereof |
| CN115792267B (en) * | 2023-01-29 | 2023-07-11 | 山东天元盈康检测评价技术有限公司 | Quantitative titration device and implementation method thereof |
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Application publication date: 20120620 |