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Volt-ampere method for detecting alkaline content of weakly alkaline water based on hydroquinone oxidization and application thereof

A technology of hydroquinone and weak alkaline water is applied in the field of electrochemical detection, which can solve the problems of complex analysis process, difficult sample preparation and high operating cost, and achieve the effects of high smoothness, wide polarization range and good conductivity.

Inactive Publication Date: 2019-08-09
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have disadvantages such as low precision, poor selectivity, low accuracy, high operating cost, difficult sample preparation, and complicated analysis process to varying degrees.

Method used

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  • Volt-ampere method for detecting alkaline content of weakly alkaline water based on hydroquinone oxidization and application thereof
  • Volt-ampere method for detecting alkaline content of weakly alkaline water based on hydroquinone oxidization and application thereof
  • Volt-ampere method for detecting alkaline content of weakly alkaline water based on hydroquinone oxidization and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Sodium bicarbonate (NaHCO 3 ) Preparation of standard solution: Weigh 0.0210g of sodium bicarbonate in a small beaker, add a small amount of water to dissolve it, then transfer it to a 25ml volumetric flask, rinse the beaker three times, transfer all the solution into the volumetric flask, and finally dilute with water to the tick mark. As mother solution (10mM) for later use.

[0035] 1. Bare glassy carbon electrode pretreatment: The bare glassy carbon electrode was polished with alumina powder with a particle size of 1.0 μm and alumina powder with a particle size of 0.3 μm in sequence, rinsed with double distilled water, and then ultrasonically treated in double distilled water for 30 Seconds, spare.

[0036] 2. Preparation of electrolytic solution: Add sodium bicarbonate (NaHCO 3 ) standard solution mother liquor and hydroquinone (QH 2 ), use 0.1mol / L KCl to set the volume to the mark, and obtain different electrolytic solutions respectively.

[0037] Electrolyt...

Embodiment 2

[0082] A Voltammetric Method for Detecting Alkali Content in Weak Alkaline Water Based on Hydroquinone Oxidation

[0083] (1) Establish a standard curve and linear regression equation between the peak current value of -0.13V and the concentration of sodium bicarbonate

[0084] 1. Preparation of a series of sodium bicarbonate standard solutions:

[0085] Preparation of sodium bicarbonate standard solution: Weigh 0.0105g of sodium bicarbonate in a small beaker, add a small amount of water to dissolve, then transfer it to a 25ml volumetric flask, rinse the beaker three times, and transfer all the solution into the volumetric flask. Finally dilute to the mark with water. As a mother solution (5mM) for later use.

[0086] In a 10mL volumetric flask, add sodium bicarbonate standard solution mother liquor and hydroquinone respectively, and then dilute to the mark with 0.1mol / L KCl to obtain hydroquinone with a final concentration of 0.5mmol / L, sodium bicarbonate The standard conce...

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Abstract

The invention discloses a volt-ampere method for detecting alkaline content of weakly alkaline water based on hydroquinone oxidization and application thereof. The volt-ampere method comprises the following steps: building a three-electrode system by taking a bare glassy carbon electrode as a working electrode, a platinum electrode as a counter electrode, and Hg / Hg2Cl2 as a reference electrode; building a standard curve and a linear regression equation for the variable quantity of -0.13V peak current value and a sodium carbonate standard solution concentration by scanning with a differential pulse method; and scanning with the differential pulse method to detect the 0.1 to 3V peak current value of the weakly alkaline water to be detected, and substituting the peak current value into the linear regression equation to calculate the sodium bicarbonate content of a sample solution to be detected. According to the volt-ampere method for detecting alkaline content of the weakly alkaline water based on hydroquinone oxidization, the detection limit is 2.0*10<-5>molL<-1>, and the sensitivity is 4.21([mu]A / mmolL<-1>). The method has the advantages of easiness in operation, high sensitivity,high stability and the like.

Description

technical field [0001] The invention relates to the technical field of electrochemical detection, in particular to a novel electrochemical method for measuring alkali content in weak alkaline water developed based on hydroquinone oxidation. Background technique [0002] The impact of acidity and alkalinity in drinking water on human health has always been a hot spot of concern. Although weakly acidic or weakly alkaline drinking water is not enough to adjust the acid-base balance of human body fluids, studies have shown that long-term drinking of weakly alkaline mineral water is beneficial to human health. It can enhance human blood circulation and cell metabolism, neutralize gastric acid, and improve Symptoms of indigestion, but excessive intake of alkaline substances can also damage health. Therefore, it is particularly important to determine the content of sodium bicarbonate in drinking water. [0003] Electrochemical detection is a method to determine the characteristic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48G01N33/18
CPCG01N27/48G01N33/18
Inventor 王建国邵翠敏张丽娟韩映辉林觅
Owner LIAONING UNIVERSITY
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