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Liquid droplet volume invariable microtitration capillary

A droplet volume and capillary technology, applied in the field of chemical analysis, can solve the problems of large thermal expansion coefficient, strong wetting effect, easy to break, etc.

Inactive Publication Date: 2008-08-06
蔡成翔
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the disadvantages of strong wetting effect and easy breakage of the glass microburette, and the large thermal expansion coefficient and easy deformation of the plastic microburette, and improve the stability of the volume of the droplet dripped from the tip of the tube, the present invention provides a capillary microburette, which can maintain The plastic tube has the advantages of low cost and the nozzle is not easy to break, and can maintain the characteristics of the transparent glass tube body and the stable tip diameter, so that the volume of the dripping droplet remains stable and uniform for a long time

Method used

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  • Liquid droplet volume invariable microtitration capillary

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specific Embodiment approach 2

[0014] Application of the present invention in capillary microburette weighing titration method: add indicator in a certain amount of liquid to be tested, drop standard solution to the end point with capillary microburette, weigh the mass before and after capillary microburette titration with electronic balance, difference The value is the quality of the standard solution consumed, based on which the content of the solution to be tested can be obtained.

specific Embodiment approach 3

[0015] The method of the present invention as a small measuring cylinder to measure 1.2mL solution: pinch a capillary microburette body (1) with a known accurate droplet volume (set to 0.02mL / drop) with fingers, suck the solution to the 1.5mL scale After the line (2), drop it into the designated container. When the liquid level drops to the 0.5mL mark, add another 10 drops of the solution.

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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 [0001] The invention belongs to the field of chemical analysis, and relates to a special microtitration device which can be used for capillary microburette meter drop titration, and the device can also be used for capillary microburette weighing titration, or used as a common capillary burette with scale for a small amount of liquid The amount to take. Background technique [0002] When a general liquid drops from a dropper, its drop volume is affected by factors such as temperature, viscosity, density, and the adsorption force of the dropper mouth. The viscosity and density of the solution change little at room temperature, so the drop volume is only related to the adsorption force of the dropper mouth, and the adsorption force is related to the contact area, dropper material and nozzle diameter. Therefore, in theory, the volume of a droplet dripped from a dropper at room temperature is a constant, and the volume of the liquid can be obtained by recording t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/18
Inventor 蔡成翔
Owner 蔡成翔
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