Method for measuring mixed base concentration by combining pH electrode and flow injection analysis (FIA)

A flow injection, mixed alkali technology, applied in the analysis of materials, analysis by chemical reaction of materials, and material analysis by observing the influence of chemical indicators, etc., can solve problems such as expensive, complicated equipment, and troublesome operation. Achieve the effect of low cost, cheap instrument and easy operation

Active Publication Date: 2011-05-04
JIANGSU WELM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of these methods have the disadvantages of complicated equipment, expensive operation and troublesome operation.

Method used

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  • Method for measuring mixed base concentration by combining pH electrode and flow injection analysis (FIA)
  • Method for measuring mixed base concentration by combining pH electrode and flow injection analysis (FIA)
  • Method for measuring mixed base concentration by combining pH electrode and flow injection analysis (FIA)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] Reagent preparation: Take 10mL of filtered industrial wastewater into a 25mL volumetric flask, dilute to the mark with high-purity deionized water;

[0103] Experimental method: the pH value of the solution to be measured is 12.22, and then the solution to be tested is injected into the flow injection analysis to obtain the flow injection analysis peak, and the peak area is S=33.95; (12.22, 33.95) is brought into figure 2 In the pH-S coordinate system in , the coordinate point of the solution is between line a and line c, that is, 23.682x-252.42

[0104] Use the chromatographic work software to cut out the part of the peak with an output voltage greater than 105mV and the part of the peak with an output voltage greater than 165mV in the FIA ​​peak of the solution to be tested; use the software to integrate the areas of these two part peaks, and the peak areas are ...

Embodiment 2

[0108] Reagent preparation: Take 10mL of boiler water solution No. 1 into a 25mL volumetric flask, and dilute to the mark with high-purity deionized water.

[0109] Experimental method: measure the pH value of the solution to be tested to be 11.63, then inject the solution into the flow injection analysis to obtain the flow injection analysis peak, and the peak area is S=34.47. Put (11.63, 34.47) into figure 2 In the pH-S coordinate system in , the coordinate point of the solution is between line a and line c, that is, 23.682x-252.42

[0110] Use the chromatographic software to cut out some peaks with an output voltage greater than 105mV and some peaks with an output voltage greater than 165mV in the FIA ​​peak of the solution to be tested. Integrate the area of ​​these two partial peaks with chromatographic work software, peak area is respectively S1=46.61 and S2=16.82, p...

Embodiment 3

[0114] Reagent preparation: Take 10mL of the No. 2 boiler water solution into a 25mL volumetric flask, and dilute to the mark with high-purity deionized water.

[0115] Experimental method: the pH value of the solution to be determined is 10.87, and then the solution is injected into the flow injection analysis to obtain the flow injection analysis peak, and the peak area is S=36.06. Bring (10.87, 36.06) into figure 2 In the pH-S coordinate system in , the coordinate point of the mixed alkali is between line a and line d, that is, S > 31.25x-307.88, and X > 8.3, indicating that the components of the solution are sodium carbonate and sodium bicarbonate.

[0116] Use the chromatographic software to cut out some peaks with an output voltage greater than 105mV and some peaks with an output voltage greater than 165mV in the FIA ​​peak of the mixed alkali solution. Integrate the areas of these two partial peaks with the chromatographic work software, and the peak areas are respect...

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Abstract

The invention relates to a method for measuring the mixed base concentration by combining a pH electrode and aflow injection analysis (FIA), which is characterized by comprising the following steps: 1, establishing a flow analysis system; 2, formulating a standard curve on pH values of different solutions and the peak areas of FIA peaks; 3, formulating a standard curve on the concentrations of solutions with different components; 4, determining the components of the base solution to be measured; and 5, measuring the concentration of the base solution to be measured. The method for measuring the components and concentration of the mixed base has the advantages of no indicator, simpleness, fastness, low use cost and cheap instruments, and is easy to operate.

Description

technical field [0001] The invention relates to a method for industrial mixed alkali analysis, industrial boiler water quality analysis and industrial wastewater water quality analysis, in particular to a method for measuring the concentration of mixed alkali by combining pH electrode and flow injection analysis. Background technique [0002] At present, in the field of industrial application, manual double-indicator titration is still mostly used in the composition analysis of mixed alkalis. This method is not only slow and consumes a large amount of reagents, but also has low sensitivity. The Flow Injection Analysis (FIA) method has many advantages such as rapidity, accuracy, high degree of automation, strong versatility, and easy-to-use instruments. Therefore, the use of flow injection titration is expected to overcome many shortcomings of manual titration. Someone once combined flow injection analysis with a spectrophotometer to titrate strong and weak acids. The disad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G01N21/80G01N30/00
Inventor 宋启军张伯先
Owner JIANGSU WELM TECH
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