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Method and device for continuously analyzing pH value, phenolphthalein end-point alkalinity, total alkalinity and chloridion concentration

A technology of chloride ion concentration and phenolphthalein alkalinity, which is applied in the field of analytical chemistry, can solve problems such as low efficiency, and achieve the effects of improving work efficiency, shortening detection time, and shortening the time-consuming test process

Inactive Publication Date: 2012-07-18
SHENZHEN INST OF SPECIAL EQUIP INSPECTION & TEST
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Problems solved by technology

It takes more than half an hour for a skilled inspector to complete four items alone
Therefore, the existing technology is less effective in detecting the pH, alkalinity and chloride ion concentration of industrial circulating cooling water and boiler water

Method used

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  • Method and device for continuously analyzing pH value, phenolphthalein end-point alkalinity, total alkalinity and chloridion concentration
  • Method and device for continuously analyzing pH value, phenolphthalein end-point alkalinity, total alkalinity and chloridion concentration
  • Method and device for continuously analyzing pH value, phenolphthalein end-point alkalinity, total alkalinity and chloridion concentration

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Embodiment Construction

[0036]In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0037] Such as figure 1 , image 3 , Figure 4 Shown, in the first embodiment of the analysis method of continuous analysis pH value, phenolphthalein alkalinity, total alkalinity and chloride ion concentration of the present invention, analysis object is industrial boiler water, analyze its pH value, phenolphthalein alkalinity, total alkalinity degree and chloride ion concentration, the analytical method includes the following steps:

[0038] a. Fix the container containing the sample to be tested with a set volume on the titration table of the potentiometric titrator, use the standard acid solution adding unit to titrate the sample to be tested, and the pH electrode to collect the initial pH value and alkalinity of th...

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Abstract

The invention discloses a device and a method for continuously analyzing pH value, phenolphthalein end-point alkalinity, total alkalinity and chloridion concentration. The method comprises the following steps: a. using a standard acid liquid adding unit to perform alkalinity titration to a sample to be detected, and sequentially performing the alkalinity titration: phenolphthalein end-point alkalinity titration and total alkalinity titration, and respectively reading corresponding liquid volume values for titration in the titration end-point, calculating the phenolphthalein end-point alkalinity and the total alkalinity, wherein the initial pH value acquired by a pH electrode is the pH value of the sample to be detected; and b. performing chloridion potentiometric titration to the sample to be detected after the total alkalinity is completed, reading the liquid volume value for the titration when in the titration end-point and calculating the chloridion concentration. The device for continuously analyzing the pH value, the phenolphthalein end-point alkalinity, the total alkalinity and the chloridion concentration comprises a potentiometric titrimeter main machine with double electrode interfaces, the pH electrode (1), the standard acid liquid adding unit (2), a silver electrode (3), a silver nitrate standard liquid adding unit (4) and a control system. According to the invention, the detection time is greatly shortened, the working efficiency of the device is improved, and the sample consumption and the standard acid liquid consumption are saved.

Description

technical field [0001] The invention relates to a titration analysis method and device in the field of analytical chemistry, in particular to an analysis method and device for continuous analysis of pH value, phenolphthalein alkalinity, total alkalinity and chloride ion concentration. Background technique [0002] Industrial circulating cooling water and boiler water need to maintain a certain value of alkalinity in order to slow down the corrosion and scaling of metal pipes. According to national technical standards, alkalinity is further divided into phenolphthalein alkalinity and total alkalinity. Total alkalinity is also known as total alkalinity or methyl orange base. If the pH value and alkalinity are too small, it may be due to the acidic corrosion of the metal in contact with water; on the contrary, if the pH value and alkalinity are too high, it may be due to the alkaline corrosion of the metal in contact with water. For industrial circulating cooling water and bo...

Claims

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Application Information

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IPC IPC(8): G01N27/42
Inventor 张居光吴继权黄容
Owner SHENZHEN INST OF SPECIAL EQUIP INSPECTION & TEST
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