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Method for detecting content of chloride ions in emulsion

A technology for chloride ion content and detection method, applied in the field of detection of chloride ion content in emulsion, can solve problems such as chloride ion can not be titrated, titration end point is not obvious, measurement precision is poor, etc., to shorten detection time and low cost , the effect that is beneficial to the application

Inactive Publication Date: 2012-04-18
SHANDONG XINMEIDA TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This operation is cumbersome and time-consuming
Moreover, due to the loss of silver nitrate precipitation and dissolution, it is easy to cause chloride ions to not be titrated, and the titration end point is not obvious, especially for emulsions with low chloride ion content, large analysis errors will be caused, and the measurement precision is poor.

Method used

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  • Method for detecting content of chloride ions in emulsion
  • Method for detecting content of chloride ions in emulsion

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Taking an emulsion with a chlorine content of 10-50 mg / L as an example, the mercury nitrate titration method of the present invention and the existing silver nitrate titration method are used to measure the chloride ion content.

[0024] 1. Use Mercury nitrate titration , carry out 3 groups of parallel experiments at the same time, the steps include: use a measuring cylinder to pipette 20ml of the emulsion sample, place it in a 250ml conical flask, add 30ml of absolute ethanol and shake well; use 0.2mol / L nitric acid to adjust the pH to 2.5-3.0 , plus 3 drops of 0.5wt% diphenylazocarbohydrazide solution as an indicator, use a microburette with a graduation value of 0.02ml, and titrate with 0.0141 mol / L mercury nitrate solution to a stable light purple as the end point , after the titration is completed, calculate the chlorine content according to the following formula: Chlorine content (mg / L) = C 硝酸汞 ×V 硝酸汞 × M 氯 / V 乳化液 =0.014mol / L×V 硝酸汞 ml×35.45g / mol×10 3 / 20ml....

Embodiment 2

[0031]Taking the emulsion with a chlorine content of 50 to 100 mg / L as an example, the mercury nitrate titration method of the present invention is used to carry out 3 groups of parallel tests at the same time. The steps include: pipette 20 ml of the emulsion sample with a measuring cylinder and place it in a 250 ml conical flask , add 30ml of absolute ethanol and shake well; use 0.2mol / L nitric acid to adjust the pH to 2.5~3.0, add 3 drops of 0.5wt% diphenylazocarbohydrazide solution as indicator, and use a division value of 0.02ml Titrate with 0.0141 mol / L mercuric nitrate solution until the end point is stable light purple red. After the titration is completed, calculate the chlorine content according to the following formula: Chlorine content (mg / L) = C 硝酸汞 ×V 硝酸汞 × M 氯 / V 乳化液 =0.014mol / L×V 硝酸汞 ml×35.45g / mol×10 3 / 20ml.

[0032] The volumes of the mercury nitrate solutions used in the three groups were 2.64ml, 2.70ml and 2.80ml respectively, and the chlorine content i...

Embodiment 3

[0034] Taking the emulsion with a chlorine content of 10 to 50 mg / L as an example, two groups of parallel experiments were carried out by using the mercury nitrate titration method of the present invention. , add 30ml of absolute ethanol and shake well; use 0.1mol / L nitric acid to adjust the pH to 2.5~3.0, add 3 drops of 0.5wt% diphenylazocarbohydrazide solution as indicator, and use a division value of 0.02ml Titrate with a 0.01 mol / L mercury nitrate solution to a stable light purple-red color as the end point. After the titration, the calculated chlorine contents are 47.11 mg / L and 49.19 mg / L, respectively, with an average value of 48.15 mg / L.

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Abstract

The invention discloses a method for detecting the content of chloride ions in an emulsion, comprising the following steps of: taking an emulsion, adding anhydrous ethanol into the emulsion; adjusting pH of the emulsion to 2.5-3.0 by nitric acid, adding dropwisely diphenylacarbazone as a indicator into the emulsion, carrying out titration by using a mercury nitrate aqueous solution until it becomes stable light claret as a terminal point; and calculating the content of chloride ions C mercury nitrate*V mercury nitrate *M chlorine / V emulsion after titration. With the adoption of the mercury nitrate titration method to replace an original silver nitrate titration method, the method provided by the invention can be used to determine chlorine content in a stable emulsion and a semi-stable emulsion for cold rolling. In comparison with an original method, the method provided by the invention has advantages of simple operation, little time consumption, shortened detection time, little operation error and low cost, and is more beneficial for application.

Description

technical field [0001] The invention relates to a method for detecting the content of chloride ions in an emulsion, in particular to a method for detecting the content of chloride ions which is convenient, fast and low in cost. Background technique [0002] During the cold rolling process, due to the work hardening of the material, the deformation resistance increases, the rolling pressure increases, and as the rolling speed increases, the roll heats up. Therefore, it is necessary to adopt the cold rolling process lubrication technology with both lubrication and cooling effects, that is, emulsion. The emulsion formed by the action of rolling oil and water is widely used in the production process of cold-rolled plates, and plays an important role in reducing friction, reducing rolling pressure, cooling rolls and controlling plate scratches. [0003] The intrusion of chloride ions in the emulsion has a certain corrosion effect on the strip steel, which can destroy the passiva...

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N31/22
Inventor 曹海霞刘成荣吕文文
Owner SHANDONG XINMEIDA TECH MATERIAL
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