Method for quickly detecting low-concentration boric acid in aqueous solution by using pH meter

A rapid measurement and aqueous solution technology, applied in the field of analysis and detection, can solve the problems of high detection cost and expensive instruments, and achieve the effect of large measurement range, low detection cost, and low experimental environment requirements.

Inactive Publication Date: 2018-08-17
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method needs to use ICP-OES and ICP-MS equipment, which is easy to operate, fast and has good precision, but the experimental process needs to be carried out in a special laboratory, the equipment is expensive, and the detection cost is high

Method used

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  • Method for quickly detecting low-concentration boric acid in aqueous solution by using pH meter
  • Method for quickly detecting low-concentration boric acid in aqueous solution by using pH meter
  • Method for quickly detecting low-concentration boric acid in aqueous solution by using pH meter

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Embodiment approach

[0034] According to a preferred embodiment of the present invention, the solvent is water, preferably deionized water.

[0035] In the present invention, the boric acid and polyol are both soluble in water, and water is cheap and easy to obtain and safe to use.

[0036] In a further preferred embodiment, the mass concentration of boric acid in the prepared boric acid standard solution is 1-10 g / L, preferably 2-9 g / L, more preferably 3-8 g / L, such as 6.183 g / L .

[0037] The inventor found through research that under the condition of adding a certain amount of polyol, when the boric acid concentration is greater than 10g / L, as the boric acid concentration increases, the pH of the mixed solution obtained after adding the polyol changes less, which will cause The detection accuracy is reduced, so the present invention preferably controls the concentration of the boric acid standard solution to be less than 10g / L; when the concentration of boric acid is less than 1g / L, as the concentrat...

Embodiment 1

[0077] (1) Accurately weigh 6.183g of dried boric acid solid, dissolve it in deionized water, and then transfer to a 1L volumetric flask to make the volume with deionized water to obtain 6.183g / L boric acid standard solution; Amount of 150g of dried mannitol solid, dissolve it in deionized water, and then transfer to a 1L volumetric flask to make the volume with deionized water to obtain a standard solution of mannitol of 150g / L;

[0078] (2) Add 100mL deionized water to each of 10 conical flasks, and then add 0.1mL, 0.2mL, 0.3mL, 0.4mL, 0.5mL, 0.6mL, 0.7mL, 0.8mL, 0.9mL, 1mL boric acid standard The solutions are marked as standard solution 1 to standard solution 10. After mixing, adjust the pH of the solution to 5.50;

[0079] Add 20mL mannitol standard solution to the above solution, and measure the pH value of the mixed solution after mixing (repeating the measurement three times and then taking the average value). The results are shown in Table 1:

[0080] Table 1

[0081]

[008...

Embodiment 2

[0094] (1) Accurately weigh 6.183g of the dried boric acid solid, dissolve it in deionized water, then transfer it to a 1L volumetric flask and dilute with deionized water to obtain 6.183g / L boric acid standard solution; The amount of 10g dried N-methyl-D-glucosamine solid, dissolved in deionized water, and then transferred to a 1L volumetric flask with deionized water to make the volume up to 10g / L of N-methyl -D-glucosamine standard solution;

[0095] (2) Add 100mL of deionized water to each of 8 Erlenmeyer flasks, and then add 0μL, 40μL, 80μL, 120μL, 160μL, 200μL, 240μL, 280μL of boric acid standard solution, respectively marked as standard solution 1~standard solution 8. Adjust the pH of the solution to 5.50 after mixing;

[0096] Add 0.5 mL of N-methyl-D-glucosamine standard solution to the above solution, and measure the pH value of the mixed solution after mixing (repeating the measurement three times and then taking the average value). The results are shown in Table 3:

[0...

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Abstract

The invention discloses a method for rapidly detecting low-concentration boric acid in an aqueous solution. The method comprises the following steps: respectively preparing a boric acid standard solution and a reaction reagent standard solution; mixing the boric acid standard solution with the reaction reagent standard solution, detecting the pH value of the obtained mixed solution, and drawing astandard working curve of a relationship between the pH value and the mass of boric acid; and detecting the pH value of a solution obtained after mixing a boric acid solution sample to be detected with the reaction reagent standard solution, and calculating the mass of the boric acid in the boric acid solution sample to be detected according to the standard working curve. The method has the advantages of simplicity in operation, short reaction time, low cost, high accuracy, and large measurable concentration range of boric acid.

Description

Technical field [0001] The invention belongs to the field of analysis and detection, and specifically relates to a method for rapidly measuring low-concentration boric acid in an aqueous solution by using a pH meter. Background technique [0002] Boric acid is widely used in glass, enamel, ceramics, medicine, metallurgy, leather, dyes, pesticides, fertilizers, textiles and other industrial fields. In the manufacturing of glass (optical glass, acid-resistant glass, heat-resistant glass, glass fiber for insulating materials), adding boric acid can improve the heat resistance and transparency of glass products, increase mechanical strength, and shorten the melting time. In the enamel and ceramic industries, adding boric acid can enhance the gloss and fastness of enamel products, and is one of the components of glazes and pigments. In the metallurgical industry, boric acid can be used as an additive or cosolvent, especially boron steel has high hardness and good rolling ductility, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/22
CPCG01N31/221
Inventor 黄焜刘杰柏元勋刘会洲
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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