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Potentiometric titration determining method of boric acid in water-based adhesive

A technology of potentiometric titration and determination method, which is applied in the direction of chemical analysis by titration, can solve the problems of unfavorable laboratory operation, unfavorable continuous operation, and high instrument requirements, and achieves simple sample processing, short test time, and equipment investment. less effect

Inactive Publication Date: 2015-11-18
CHINA TOBACCO GUANGXI IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN102680561A reports a method for determining the content of boric acid in water-based rubber for tobacco use. The method requires high instrument requirements and is not conducive to simple laboratory operations. GB / T8294-2008 specifies the method for determining the content of boric acid in natural rubber latex. This method takes a long time , is not conducive to continuous operation

Method used

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  • Potentiometric titration determining method of boric acid in water-based adhesive
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  • Potentiometric titration determining method of boric acid in water-based adhesive

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Embodiment 1

[0032] 1, the reagent used in the present invention and preparation thereof

[0033] (1) Preparation of 0.01mol / L sodium hydroxide solution: Weigh 0.4g of sodium hydroxide into a 100mL beaker, let it cool to room temperature, then transfer to a 1000mL plastic volumetric flask, and dilute to the mark with distilled water.

[0034] (2) There are two methods for calibration of 0.01mol / L sodium hydroxide solution:

[0035] Method 1: ① Preparation of boric acid solution: Accurately weigh 5 g of boric acid reference material (purity ≥ 99.9%), dissolve in water, transfer to a 1000 mL plastic volumetric flask, and add water to volume.

[0036] ② Accurately pipette 2.0 mL of boric acid solution into a beaker, add 60 mL of water, and while stirring, add hydrochloric acid solution drop by drop until the pH value of the solution is in the range of 2.0 to 5.6. Titrate with sodium hydroxide solution while stirring until the pH value of the solution reaches 7.2-8.1. Add 5mL of mannitol sat...

Embodiment 2

[0052]Determination steps of boric acid content in water-based glue with acidity meter: Weigh 5g of water-based glue sample and add it to a beaker, add 20mL of water, use a magnetic stirrer to rotate at a speed of 600rpm, add 0.5% hydrochloric acid to adjust the pH value of the solution at In the range of 2.0 to 5.6, keep stirring the treated sample, add 0.03mol / L sodium hydroxide to roughly adjust the pH value of the solution to about 5.0, and then use 0.01mol / L sodium hydroxide to adjust the pH value of the solution to 7.2, Add 2mL of mannitol saturated solution, continue to stir, the pH value of the solution drops immediately, after about 1min, adjust the burette to zero, titrate with 0.01mol / L sodium hydroxide standard solution, the pH value returns to 7.2, and record the required Volume of sodium hydroxide standard solution. And simultaneously measure the volume of the sodium hydroxide standard titration solution required for the blank sample, use the formula Calculate ...

Embodiment 3

[0060] Determination steps of boric acid content in water-based glue with automatic potentiometric titrator: Weigh 20g of water-based glue sample into a beaker, add 60mL of water, use an electric stirrer to rotate at a speed of 1200rpm, add 1% hydrochloric acid to adjust the pH of the solution If the value is in the range of 2.0 to 5.6, stir the treated sample continuously, add 0.03mol / L sodium hydroxide, adjust the pH value of the solution to 7.6, add 12mL mannitol saturated solution, the pH value of the solution will drop immediately, Titrate with 0.03mol / L sodium hydroxide standard solution, the pH value returns to 7.6, and record the volume of sodium hydroxide standard solution required at this time. And simultaneously measure the volume of the sodium hydroxide standard titration solution required for the blank sample, use the formula Calculate the boric acid content.

[0061] In the formula:

[0062] X—the content of boric acid in the sample, in milligrams per kilogram...

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Abstract

The invention discloses a potentiometric titration determining method of boric acid in water-based adhesive. According to the potentiometric titration determining method, boric acid in a system is titrated with sodium hydroxide so as to adjust pH value of the system to a certain value; a mannitol saturated solution is added for complexing boric acid in the system and reducing pH value of the system; a second time of titration is carried out with sodium hydroxide, and when pH value of the system is increased to be equal to the pH value before complexing, the volume of sodium hydroxide consumed at the moment is recorded, and the boric acid content of the system is calculated further. The potentiometric titration determining method is capable of realizing continuous operation of manual titration and an automatic potentiometric titrator; operation is simple and rapid; and detection range is wide.

Description

technical field [0001] The invention relates to a method for measuring boric acid by potentiometric titration, in particular to a method for measuring boric acid by potentiometric titration in water-based glue. Background technique [0002] Water-based adhesive is a water-soluble adhesive, which is divided into aqueous solution-based water-based adhesive, water-dispersed or emulsion-type water-based adhesive, water-based dispersion, etc. Due to its advantages of safe use and low cost, it is widely used in packaging printing, paper making and cigarette manufacturing. Since the main solvent of water-based glue is water, there may be a certain amount of boric acid in the water quality of the raw materials. High boric acid content is prone to skin irritation, conjunctivitis, and bronchitis. Therefore, it is necessary to analyze and study the content of boric acid in water-based adhesives, but there are few research methods for water-based adhesives. [0003] At present, the d...

Claims

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Application Information

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IPC IPC(8): G01N31/16
Inventor 吴晶晶李小兰田兆福陈志燕周芸黄善松黄世杰曾德芬范忠蒋光辉白家峰
Owner CHINA TOBACCO GUANGXI IND
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