CN101738427A - On-line automatic potentiometric titration - Google Patents
On-line automatic potentiometric titration Download PDFInfo
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- CN101738427A CN101738427A CN200810203310A CN200810203310A CN101738427A CN 101738427 A CN101738427 A CN 101738427A CN 200810203310 A CN200810203310 A CN 200810203310A CN 200810203310 A CN200810203310 A CN 200810203310A CN 101738427 A CN101738427 A CN 101738427A
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- automatic potentiometric
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Abstract
The invention discloses an on-line automatic potentiometric titration, comprising the processes of sampling, titrating and cleaning, and is characterized in that the sampling process is as following: firstly adding a sample into a provale cup by a peristaltic pump, overflowing the sample in the provale cup through an overfall at the bottom of the provale cup; and the titrating process is as follows: a linear stepper motor is used to push a piston pump titration device to dropwise add the titration agent into the provale cup. The on-line automatic potentiometric titration of the invention ensures very high sampling accuracy, ensures repeatability of quantitative sampling within 0.2%, and is not affected by the service time; as the transmission precision of the linear stepper motor can reach 0.0005mm/mm, the highest resolution ratio can reach 0.0015mm, the resolution of the dropwise adding volume can reach 0.0003ml, the invention greatly improves the accuracy of on-line automatic titration, and can meet the requirements of high-precision on-line automatic potentiometric titration.
Description
Technical field
The present invention relates to a kind of potentiometric titration, specifically, relate to a kind of on-line automatic potentiometric titration.
Background technology
Potentiometric titration is that the indicator electrode and the contrast electrode that will be fit to insert in the detected solution, and the titrant of every adding certain volume is measured the one-time electrode potential value, and the current potential E that records to titration volume V mapping, is partly come to determine titration end-point by the hop of curve.Potentiometric titration mainly comprises sample introduction, titration and cleaning process.For the sample introduction process: the laboratory manual operation is to pipette the quantified sample volume by transfer pipet to add in the measuring cup, and automatical potentiometric titrimeter is that peristaltic pump commonly used regularly carries out sample introduction.For titration process: the laboratory manual operation is solenoid control buret commonly used or carries out titrimetry with piston pump that automatical potentiometric titrimeter peristaltic pump commonly used carries out titration.For cleaning process: laboratory manual operation manual cleaning the commonly used, automatical potentiometric titrimeter one road peristaltic pump that increases commonly used cleans.As seen, there are defectives such as accuracy is low, poor repeatability in manual operation method; Though automatic potentiometric titration has improved the accuracy of titration, but the repeatability of the timing sampling of peristaltic pump is also relatively poor, and service time is long more, its accuracy and repeatability are poorer, in addition, working time, the long pump line that also can make was out of shape, so the accuracy and the repeatability of existing automatic potentiometric titration still can not satisfy high-precision on-line automatic potentiometric titration requirement.
Summary of the invention
The technical problem to be solved in the present invention provides the on-line automatic potentiometric titration of a kind of precision of analysis height and good reproducibility, to overcome above-mentioned existing in prior technology defective and to satisfy high-precision on-line automatic potentiometric titration requirement.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows:
On-line automatic potentiometric titration provided by the invention, comprise sample introduction, titration and cleaning process, it is characterized in that: described sample introduction process is at first sample to be joined in the Measuring glass by peristaltic pump, and the overflow vent by the Measuring glass bottom overflows to the sample in the Measuring glass in the measuring cup then; Described titration process is to promote the piston pump titration apparatus by linear stepping motor titration reagent is added drop-wise in the measuring cup.
Described Measuring glass is made up of two cups up and down, and is provided with the underflow head piece in the bottom that the sidepiece of last cup is provided with overflow vent and lower cup body.
The sample introduction pipe that is connected between the overflow vent of described Measuring glass bottom and measuring cup is provided with the application of sample solenoid valve.
Described linear stepping motor adopts screw drive, and roller-compaction of screw rod.
Preferably be provided with the crack nut that oppositely disappears on the described screw rod.
The piston tube of described piston pump titration apparatus is the right cylinder hollow glass tube, and the internal diameter of glass tube immobilizes.
Compared with prior art, beneficial effect of the present invention is as follows:
1) because sample introduction process of the present invention is at first sample to be joined in the Measuring glass by peristaltic pump, with the overflow method measuring cup is carried out quantitative sample injection then, because of the overflow vent bore of Measuring glass very little, therefore sample injection unit of the present invention can guarantee very high sample introduction accuracy, quantitative repeatability is guaranteed in 0.2%, be not subjected to the influence of length service time.
2) because titration process of the present invention is by linear stepping motor promotion piston pump titration apparatus titration reagent to be added drop-wise to carry out titration in the measuring cup, because of the transmission accuracy of linear stepping motor can reach 0.0005mm/mm, highest resolution can reach 0.0015mm, the resolution that drips volume can reach 0.0003ml, therefore the present invention has improved the accuracy of titration greatly, can satisfy high-precision on-line automatic potentiometric titration requirement.
Description of drawings
Fig. 1 is a principle of work synoptic diagram of the present invention.
Among the figure: 1. solenoid valve for sampling; 2. peristaltic pump; 3. Measuring glass; 4. measuring cup; 5. linear stepping motor; 6. piston pump titration apparatus; 7. buret; 8-1. last overflow vent; 8-2. underflow head piece; 9. application of sample solenoid valve; 10. control module.
Embodiment
Below in conjunction with drawings and Examples the present invention is done further detailed, complete explanation:
Embodiment
As shown in Figure 1: on-line automatic potentiometric titration of the present invention, comprise sample introduction, titration and cleaning process, described sample introduction process is to open solenoid valve for sampling 1 and peristaltic pump 2 by control module 10, at first sample is joined in the Measuring glass 3 by peristaltic pump 2, the overflow vent 8-2 by the Measuring glass bottom overflows to the sample in the Measuring glass in the measuring cup 4 then; Described titration process is to promote piston pump titration apparatus 6 by linear stepping motor 5 titration reagent is added drop-wise in the measuring cup 4 by buret 7.
Described Measuring glass 3 is made up of two cups up and down, and the bottom that is provided with overflow vent 8-1 and lower cup body at the sidepiece of last cup is provided with underflow head piece 8-2, the underflow head piece 8-2 of Measuring glass lower cup body bottom is provided with application of sample solenoid valve 9 with the sample introduction pipe that 4 of measuring cups are connected, when peristaltic pump 2 joined sample in the Measuring glass 3, control module 10 can be closed application of sample solenoid valve 9; When the overflow vent 8-2 of sample bottom Measuring glass was added in the measuring cup 4, control module 10 can be closed solenoid valve for sampling 1 and peristaltic pump 2, and opened application of sample solenoid valve 9.
Described linear stepping motor 5 adopts screw drive, and roller-compaction of screw rod, preferably is provided with the crack nut that oppositely disappears on the screw rod.
The piston tube of described piston pump titration apparatus 6 is the right cylinder hollow glass tube, and the internal diameter of glass tube immobilizes.
Claims (6)
1. on-line automatic potentiometric titration, comprise sample introduction, titration and cleaning process, it is characterized in that: described sample introduction process is at first sample to be joined in the Measuring glass by peristaltic pump, and the overflow vent by the Measuring glass bottom overflows to the sample in the Measuring glass in the measuring cup then; Described titration process is to promote the piston pump titration apparatus by linear stepping motor titration reagent is added drop-wise in the measuring cup.
2. on-line automatic potentiometric titration according to claim 1 is characterized in that: described Measuring glass is made up of two cups up and down, and is provided with the underflow head piece in the bottom that the sidepiece of last cup is provided with overflow vent and lower cup body.
3. on-line automatic potentiometric titration according to claim 1 is characterized in that: the sample introduction pipe that the overflow vent of described Measuring glass bottom is connected with measuring cup is provided with the application of sample solenoid valve.
4. on-line automatic potentiometric titration according to claim 1 is characterized in that: described linear stepping motor adopts screw drive, and roller-compaction of screw rod.
5. on-line automatic potentiometric titration according to claim 4 is characterized in that: described screw rod is provided with the crack nut that oppositely disappears.
6. on-line automatic potentiometric titration according to claim 1 is characterized in that: the piston tube of described piston pump titration apparatus is the right cylinder hollow glass tube, and the internal diameter of glass tube immobilizes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810203310A CN101738427A (en) | 2008-11-25 | 2008-11-25 | On-line automatic potentiometric titration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810203310A CN101738427A (en) | 2008-11-25 | 2008-11-25 | On-line automatic potentiometric titration |
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| CN101738427A true CN101738427A (en) | 2010-06-16 |
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| CN200810203310A Pending CN101738427A (en) | 2008-11-25 | 2008-11-25 | On-line automatic potentiometric titration |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616471A (en) * | 2013-11-22 | 2014-03-05 | 安徽华业香料股份有限公司 | Detection method for esterification reaction in production process of hexyl salicylate |
| CN103675308A (en) * | 2013-12-30 | 2014-03-26 | 力合科技（湖南）股份有限公司 | On-line analyzer for aquatic VOCs (Volatile Organic Chemicals) |
| CN105116098A (en) * | 2015-09-10 | 2015-12-02 | 中国家用电器研究院 | Automatic titration method and application |
| CN105223257A (en) * | 2014-06-16 | 2016-01-06 | 上海宝钢工业技术服务有限公司 | The on-line determination method of zinc ion concentration in electroplate liquid |
| 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 |
| CN106290704A (en) * | 2015-06-23 | 2017-01-04 | 中美华世通生物医药科技（武汉）有限公司 | Titration system and titration method |
| CN106370777A (en) * | 2016-08-30 | 2017-02-01 | 济南海能仪器股份有限公司 | Potentiometric titration control method and device and potentiometric titration system and method |
| CN106706945A (en) * | 2016-12-30 | 2017-05-24 | 无锡博慧斯生物医药科技有限公司 | Automatic reagent dropping device and portable tester applying same |
| 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 |
| 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 |
| CN111505201A (en) * | 2020-04-24 | 2020-08-07 | 李莉 | Potentiometric titrator structure capable of automatically cleaning and discharging waste |
-
2008
- 2008-11-25 CN CN200810203310A patent/CN101738427A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616471A (en) * | 2013-11-22 | 2014-03-05 | 安徽华业香料股份有限公司 | Detection method for esterification reaction in production process of hexyl salicylate |
| CN103675308A (en) * | 2013-12-30 | 2014-03-26 | 力合科技（湖南）股份有限公司 | On-line analyzer for aquatic VOCs (Volatile Organic Chemicals) |
| CN103675308B (en) * | 2013-12-30 | 2016-03-30 | 力合科技（湖南）股份有限公司 | VOCs in-line analyzer in a kind of water |
| CN105223257B (en) * | 2014-06-16 | 2019-04-23 | 上海宝钢工业技术服务有限公司 | The on-line determination method of zinc ion concentration in electroplate liquid |
| CN105223257A (en) * | 2014-06-16 | 2016-01-06 | 上海宝钢工业技术服务有限公司 | The on-line determination method of zinc ion concentration in electroplate liquid |
| CN106290704A (en) * | 2015-06-23 | 2017-01-04 | 中美华世通生物医药科技（武汉）有限公司 | Titration system and titration method |
| CN105116098A (en) * | 2015-09-10 | 2015-12-02 | 中国家用电器研究院 | Automatic titration method and application |
| 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 |
| 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 |
| CN106370777A (en) * | 2016-08-30 | 2017-02-01 | 济南海能仪器股份有限公司 | Potentiometric titration control method and device and potentiometric titration system and method |
| CN106370777B (en) * | 2016-08-30 | 2018-10-02 | 济南海能仪器股份有限公司 | A kind of constant-current titration control method and device, constant-current titration system and method |
| CN106706945A (en) * | 2016-12-30 | 2017-05-24 | 无锡博慧斯生物医药科技有限公司 | Automatic reagent dropping device and portable tester applying same |
| 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 |
| CN109856221B (en) * | 2017-11-30 | 2021-06-01 | 中国科学院大连化学物理研究所 | On-line monitoring system for simultaneously detecting hydrazine nitrate and hydroxylamine nitrate |
| CN111505201A (en) * | 2020-04-24 | 2020-08-07 | 李莉 | Potentiometric titrator structure capable of automatically cleaning and discharging waste |
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Open date: 20100616 |