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Device and method for automatically measuring ions in water by adopting color sensor

A color sensor, automatic measurement technology, applied in material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve the problems of hydrochloric acid solution dosage error, content error, different judgment end points, etc.

Inactive Publication Date: 2020-11-06
HKY TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

At present, the determination of carbonate / bicarbonate / hydroxide in water quality uses phenolphthalein and methyl orange as indicators, and titrates with standard hydrochloric acid of known concentration. Due to the color change pH range of phenolphthalein is 8.2-10.0, methyl orange The color change pH range of the indicator is 3.1-4.4. Within the color change range of the indicator, there is a problem that different personnel judge different end points, which may easily cause errors in the amount of hydrochloric acid solution, resulting in the existence of calculation of carbonate / bicarbonate / hydroxide content. Error, based on the above technical defects, this patent provides a method and device for automatically measuring carbonate and bicarbonate in water quality using a color sensor

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  • Device and method for automatically measuring ions in water by adopting color sensor
  • Device and method for automatically measuring ions in water by adopting color sensor

Examples

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Embodiment 1

[0072] In this embodiment, the initial color of the mixed solution after adding phenolphthalein is pink, and the method steps for measuring carbonate and bicarbonate in the water sample are as follows:

[0073] S1. Take 0.2-10mL of the water sample to be tested, record the actual sampling volume as V, add 50mL of deionized water boiled for 30 minutes, and record the color value of the solution at this time as the blank color value;

[0074] S2. Add 3 drops of phenolphthalein reagent (150 μL) to the mixed solution in step S1 through the second quantitative pump 11, measure the color value of the mixed solution at this time and record it as the initial color value, which should be pink at this time.

[0075] S3. The hydrochloric acid solution of known concentration is automatically added at a certain speed through the first quantitative pump 8 until the color of the water sample to be tested changes to the first special color value (the blank color value in step S1), and the addition is...

Embodiment 2

[0088] In this example, after adding phenolphthalein, the color of the mixed solution is still a blank color value, that is, there is no change. The method steps for measuring carbonate, bicarbonate and hydroxide in the water sample are as follows:

[0089] S1. Take 0.2-10mL of the water sample to be tested, record the actual sampling volume as V, add 50mL of deionized water boiled for 30 minutes, and record the color value of the solution at this time as the blank color value;

[0090] S2. Add 3 drops of phenolphthalein reagent (150μL) to the mixed solution in step S1 through the quantitative pump 2. Determine the color value of the mixed solution at this time and record it as the initial color value. At this time, it should still be the blank color value, that is, the color after adding phenolphthalein No change.

[0091] S3. Add 2 drops of methyl orange solution (100μL) to the mixed solution of S3 through the quantitative pump 3. After adding the methyl orange solution, the mixed ...

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Abstract

The invention relates to a device and method for automatically measuring ions in water by adopting a color sensor. The device comprises a measuring cell, a stirrer arranged in the measuring cell, a standard hydrochloric acid solution supply mechanism, a phenolphthalein solution supply mechanism and a methyl orange solution supply mechanism, wherein the standard hydrochloric acid solution supply mechanism, the phenolphthalein solution supply mechanism and the methyl orange solution supply mechanism are communicated with the measuring cell. A color sensor is arranged in the measuring cell and connected with a control system through a signal panel. According to the patent, the color sensor is adopted to identify the color mutation end point, automatic titration and measurement are carried out, manual titration and manual judgment of the end point are completely replaced, related standards and methods are completely met, and the contents of carbonate, bicarbonate and hydroxide in water canbe accurately measured in real time.

Description

Technical field [0001] The invention belongs to the field of chemical water quality analysis, and in particular relates to a device and method for automatically measuring the concentration of carbonate / bicarbonate / hydroxide ions in water by using a color sensor. Background technique [0002] Carbonate and bicarbonate are the main anions in the separated water in the mining industry such as crude oil. Measuring the carbonate and bicarbonate concentration of formation water during the mining process can help determine the hardness and type of formation water and the amount of carbon dioxide in the separated water. At present, the determination of carbonate / bicarbonate / hydroxide in water quality uses phenolphthalein and methyl orange as indicators, and titrates with standard hydrochloric acid of known concentration. Because the color change of phenolphthalein is in the range of 8.2-10.0, methyl orange The discoloration pH range of the indicator is 3.1-4.4. Within the discoloration r...

Claims

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Application Information

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IPC IPC(8): G01N21/79
CPCG01N21/79
Inventor 吕运昌陈云龙李蔚丁瑞峰边宝丽李擎
Owner HKY TECH
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