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Method for testing fluorine ions in industrial sewage

An inspection method and technology for industrial sewage, which are applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by causing chemical reactions to occur in materials, etc., can solve the problems of complicated and cumbersome methods, and it is difficult to quickly grasp the operation procedures.

Inactive Publication Date: 2019-04-05
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The method is complex and cumbersome, and the equipment and selected electrodes require long-term maintenance. As an analyst, it is difficult to quickly grasp the operating procedures

Method used

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Embodiment

[0027] (1) Adjustment of pH: Take 100mL of water sample in a 500mL Erlenmeyer flask, add dropwise NaOH solution to adjust the pH of the solution to 7-8, add an appropriate amount of AgNO 3 Solution, adjust the pH value of the solution=6~7, now the solution part is colorless;

[0028] (2) Elimination of interference: Dry filter the test solution, wash the filter paper several times, keep all the filtrate, add a few drops of sodium alizarin sulfonate solution to the filtrate, the solution is red, if it is yellow, add a small amount of NaOH solution to red ;

[0029] (3) Titration: Finally add HNO dropwise 3 Solution until the solution is just yellow, add 3mL of buffer solution, and then titrate with 0.01mol / L thorium nitrate standard solution until the end point is red and no yellow, and the volume V of thorium nitrate solution is consumed;

[0030] (4) Calculate F － Concentration, F － (g / L)=4×0.01×V×19 / 100.

[0031] The NaOH solution concentration described in step (1) is ...

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Abstract

The invention relates to environmental science, and specifically provides a novel detection method for analyzing fluorine ions in industrial sewage. The method comprises the following steps: taking proper amount of water samples in a triangular flask; dropping a NaOH solution to adjust the solution pH value to be 7 to 8; after dropping an AgNO3 solution, adjusting the solution pH value to be 6 to7; after that, performing dry filtration on a test solution, retaining whole filtrate, and adding a few drops of sodium alizarin sulfonate to the filtrate, and the solution is red; after that, dropping dilute HNO3 until the solution is just yellow, after adding a buffer solution, titrating with a thorium nitrate standard solution until the solution is red (without yellow), and taking the solutionas an end point; and finally, an analysis result of the fluoride ions in the sewage is obtained by calculation. The method of the invention is simple and rapid, an analysis period can be controlled within one hour, and the method is easily promoted in general sewage treatment laboratories.

Description

technical field [0001] This patent relates to environmental protection science, and especially provides a new testing method for analyzing fluoride ions in industrial sewage, which saves costs and improves analysis efficiency. Background technique [0002] Sewage analysis is a task that must be performed by industrial production enterprises to meet environmental protection standards. Only polluting components that meet the sewage requirements can be discharged. At present, many enterprises use the ion selective electrode method for analysis. The analysis procedure of this method is cumbersome, and the equipment needs long-term maintenance. In addition, the analysis procedure of the chemical analysis method is complicated, requires a large amount of chemical reagents, and the analysis period is long. For analysts who do not have a lot of analysis experience. It's hard to get to work quickly. People expect an analysis method with low investment, simple operation and accurate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 詹秀嫣苗峰杨丽张庸暴云飞
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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