CN101236187A - Liquid droplet volume invariable microtitration capillary - Google Patents
Liquid droplet volume invariable microtitration capillary Download PDFInfo
- Publication number
- CN101236187A CN101236187A CNA2008100734832A CN200810073483A CN101236187A CN 101236187 A CN101236187 A CN 101236187A CN A2008100734832 A CNA2008100734832 A CN A2008100734832A CN 200810073483 A CN200810073483 A CN 200810073483A CN 101236187 A CN101236187 A CN 101236187A
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- capillary
- dropper
- droplet
- titration
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Abstract
The invention relates to a special micro-titration apparatus which has an even and stable liquid drop size and is applicable to a capillary micro-titration tube drop counting titration method. The invention comprises a plastic dropper with a hollow stainless steel capillary, wherein the body of the dropper (1) is made of soft transparent plastics riching in elasticity, the closed end of the dropper is enlarged, the middle section of the dropper has an even pipe diameter and volume calibration tails (2), and the other end of the dropper gradually tapers off to form a tip which is connected with the hard, flat-interface hollow stainless steel capillary (3). The device can also be applicable to a capillary micro-titration tube weighing titration method, or serve as a common dropper with graduations for measuring off small amount of liquid.
Description
Technical field
The invention belongs to chemical analysis field, relate to a kind of special-purpose microtitre device that capillary droplet fixed tube meter drips titrimetry that can be used for, this device also can be used for capillary droplet fixed tube gravimetric titration method, or is used for measuring of small amount of liquid as the common capillary burette of band scale.
Background technology
General liquid is when dropper drips, and its droplet size is subjected to the influence of factors such as temperature, viscosity, density and dropper mouth absorption affinity.The viscosity and the variable density of dissolved liquid are less, so droplet size is only relevant with the absorption affinity of dropper mouth, and absorption affinity is relevant with nozzle diameter with contact area, dropper material again.So in theory, the droplet size that oozes from a dropper under the normal temperature is a constant, can obtain liquid volume by the record number of drops.Find in the practical application that drop is more little, the stability of its volume is high more.Above principle is applied in the titrimetry, promptly is called capillary droplet fixed tube meter and drips titrimetry.It is a kind of be the micro-titration analytical approach of measurement unit with the titrant number of drops.The employed microtitre device of this method---capillary droplet fixed tube is drawn by simple glass or plastic dropper heating usually and forms, and generally should make its droplet size that oozes reach 0.02～0.005mL/ and drip, and can satisfy droplet size and stablize constant requirement.But this homemade capillary droplet fixed tube tip is very thin thin, often occurs some problems in the use: for example, with the capillary droplet fixed tube that glass tube draws, its most advanced and sophisticated tube wall thin and fragile of one side, the breakage that very easily fractures is inconvenient to take care of and use; Because the wetting action of glass is stronger, in case be stained with greasy dirt, its wetting action will descend and cause that the titration mouth of pipe and drop contact area change, and cause droplet size to change on the other hand.And for example, be the capillary droplet fixed tube of material with vinyon, its tube wall is thin on the one hand, tip is soft yielding; On the other hand because the big (stainless steel 1.2 * 10 of poly thermal expansivity
-5K
-1, glass 2.6 * 10
-5K
-1, tygon 1.5 * 10
-4K
-1), its tip diameter can change with temperature fluctuation; So its droplet size that oozes also is difficult for stable for extended periods of time.
Summary of the invention
The wetting action of glass microspheres fixed tube is strong in order to overcome, frangibility, big, the yielding deficiency of plastics droplet fixed tube thermal expansivity, improve the stability of tip drip drop volume, the invention provides a kind of capillary droplet fixed tube, it can keep that plastic tube is with low cost, the mouth of pipe advantage of frangibility not, can keep the characteristics that the glass pipe shaft is transparent, the tip bore is stable again, the drop volume size stable for extended periods of time that it is oozed is even.
The technical solution adopted for the present invention to solve the technical problems is: the pipe shaft of capillary droplet fixed tube is made with whippy transparent flexible plastics, and an end of sealing expands, the middle part uniform diameter, on scale mark is arranged; The other end of the pipe formation tip that is tapered connects a hard, flat mouthful hollow stainless steel capillary again on the tip.
The invention has the beneficial effects as follows that vinyon pipe shaft good springiness, transparency height, with low cost, easy to make, the scale mark on the pipe shaft also are convenient to estimate the liquid volume that sucks, maybe can replacing in a small amount, tube uses; Hollow Stainless Steel Capillary tip intensity height, not frangibility fragmentation, also not with water generation wetting action, add that its thermal expansivity is less than glass and plastics, therefore the stable performance of Stainless Steel Capillary tip is durable, and the mouth of pipe is stable with the contact interface that oozes drop, and droplet size varies with temperature less, its uniformity coefficient is better than glass and plastic capillary, can satisfy the relevant technologies requirement that capillary droplet fixed tube meter drips titrimetry.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is a longitudinal profile of the present invention structural map.
End softness and the high resilience that plastics pipe shaft (1) expands among the figure can suck or ooze with the finger pinching Liquid, the middle part of uniform diameter is with graduation mark (2), both has been convenient to estimate the liquid volume that sucks, can do again Be in a small amount tube use; The other end of the pipe formation tip that is tapered connects a hollow stainless steel wool again on the tip Tubule (3) has higher intensity and stable performance to guarantee the mouth of pipe.
If the present invention decides device as the special-purpose droplet that capillary droplet fixed tube meter drips titration, need to survey earlier before using Surely ooze the volume of drop, if decide device as the droplet of capillary droplet fixed tube gravimetric titration method, this step then Can omit. The assay method of droplet size is: with the end that expands of finger pinching pipe shaft (1) with in the discharge pipe Air stretches into tip (3) in the distilled water, unclamps finger to suck distilled water, can by graduation mark (2) Estimate the volume of suction; The droplet fixed tube is put into the electronic balance weighing, take out behind the record numerical value, with finger The pipe shaft that pinching expands (1) dropwise oozes after tens of the dripping again its quality of weighing, can ask according to following formula Go out the volume (on average) of drop:
Droplet size (milliliter/drip)=
The droplet fixed tube oozes ÷ of poor quality before and after the drop (density of water * ooze drop number)
The droplet size that every capillary droplet fixed tube oozes be measured and be marked to apparatus of the present invention can by manufacturer, uses with convenient.
Embodiment one
The present invention is dripped application in the titrimetry at capillary droplet fixed tube meter: add indicator in a certain amount of test solution to be measured, capillary droplet fixed tube with known accurate droplet size dropwise drips standard solution to terminal, write down the number of drops that titration consumes, can obtain the content of test solution to be measured.
Embodiment two
The application of the present invention in capillary droplet fixed tube gravimetric titration method: in a certain amount of test solution to be measured, add indicator, drip standard solution to terminal with capillary droplet fixed tube, with the quality before and after the titration of electronic balance weighing capillary droplet fixed tube, difference is the standard solution quality of consumption, can obtain the content of test solution to be measured in view of the above.
Embodiment three
The method of 1.2mL solution is measured in the present invention as little graduated cylinder: with the capillary droplet fixed tube pipe shaft (1) of a finger known accurate droplet size of pinching (being made as 0.02mL/ drips), suck this solution to 1.5mL scale mark (2) back it is splashed into specified containers, when treating that liquid level is reduced to the 0.5mL scale mark, 10 solution of many again droppings get final product.
Claims (2)
1, the constant capillary droplet fixed tube of a kind of droplet size, it comprises the plastic dropper with hollow stainless steel capillary, it is characterized in that pipe shaft (1) makes with nonrigid plastic, an end of sealing expands, the middle part uniform diameter, on volume markings line (2) is arranged; The other end of the pipe formation tip that is tapered connects a hollow stainless steel capillary (3) again on the tip.
2, capillary droplet fixed tube according to claim 1 is characterized in that described pipe shaft (1) is whippy transparent flexible plastics pipe, and tip is the hollow stainless steel capillary (3) of a hard, flat mouth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100734832A CN101236187A (en) | 2008-03-04 | 2008-03-04 | Liquid droplet volume invariable microtitration capillary |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100734832A CN101236187A (en) | 2008-03-04 | 2008-03-04 | Liquid droplet volume invariable microtitration capillary |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101236187A true CN101236187A (en) | 2008-08-06 |
Family
ID=39919950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100734832A Pending CN101236187A (en) | 2008-03-04 | 2008-03-04 | Liquid droplet volume invariable microtitration capillary |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101236187A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107084764A (en) * | 2017-05-09 | 2017-08-22 | 成都齐思科技有限责任公司 | A kind of mechanical seal leakage flow monitoring method |
| CN108181429A (en) * | 2018-01-25 | 2018-06-19 | 中国建筑材料科学研究总院有限公司 | A kind of chemical analysis titration kit and titration method |
-
2008
- 2008-03-04 CN CNA2008100734832A patent/CN101236187A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107084764A (en) * | 2017-05-09 | 2017-08-22 | 成都齐思科技有限责任公司 | A kind of mechanical seal leakage flow monitoring method |
| CN108181429A (en) * | 2018-01-25 | 2018-06-19 | 中国建筑材料科学研究总院有限公司 | A kind of chemical analysis titration kit and titration method |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| DD01 | Delivery of document by public notice |
Addressee: Cai Chengxiang Document name: Notification that Application Deemed to be Withdrawn |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080806 |