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Device and method for automatically measuring ions in water by adopting anti-pollution pH electrode

An automatic measurement and anti-pollution technology, applied in measuring devices, chemical method analysis, chemical analysis by titration, etc., can solve problems such as inability to measure online and in real time

Inactive Publication Date: 2020-11-06
HKY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above two schemes can only be measured offline in the laboratory, and cannot be measured online and in real time, which has certain limitations

Method used

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  • Device and method for automatically measuring ions in water by adopting anti-pollution pH electrode
  • Device and method for automatically measuring ions in water by adopting anti-pollution pH electrode

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Embodiment 1

[0075] The initial pH of the water sample in this embodiment is greater than 8.5, and the method steps of measuring carbonate, bicarbonate and hydroxide in this water sample are as follows:

[0076] S1. Take 5-10 mL of the water sample to be tested, record the actual sampling volume as V, and add 50 mL of deionized water boiled for 30 minutes;

[0077] S2. Add a hydrochloric acid solution with a known concentration of c(HCl) to the water sample to be tested, and automatically titrate to the pH of the water sample to be tested to the first characteristic end point through devices such as a quantitative pump, and record the time of adding the hydrochloric acid solution Volume V1 and concentration c.

[0078] S3. Continue to add hydrochloric acid solution with a known concentration of c(HCl) to the mixed solution in step S2, automatically titrate to the pH of the water sample to be tested to the second characteristic end point by a quantitative pump, and record the volume V2 of t...

Embodiment 2

[0090] The initial pH of the water sample in this embodiment is less than 8.5, and the method steps of measuring carbonate, bicarbonate and hydroxide in this water sample are as follows:

[0091] S1. Take 5-10 mL of the water sample to be tested, record the actual sampling volume as V, and add 50 mL of deionized water boiled for 30 minutes;

[0092] S2. Add a hydrochloric acid solution with a known concentration of c(HCl) to the mixed solution of S1, and automatically titrate to the pH of the water sample to be tested to the second characteristic end point through a quantitative pump and other devices, and record the time of adding the hydrochloric acid solution Volume V2.

[0093] S3, calculating the contents of carbonate, bicarbonate and hydroxide in the water sample. Calculated as follows:

[0094] At this point only HCO is in the solution 3- :

[0095] ρ(HCO 3- )=(V2×61.02×c(HCl) / V

[0096] Among them, ρ(HCO 3- ) represents the concentration of bicarbonate, the unit...

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Abstract

The invention relates to a device and method for automatically measuring ions in water by adopting an anti-pollution pH electrode. The device comprises a measuring cell, a stirrer arranged in the measuring cell and a standard hydrochloric acid solution supply mechanism communicated with the measuring cell. A pH electrode and an ORP electrode are arranged in the measuring cell, and the pH electrodeand the ORP electrode are connected with a control system through a signal plate; the standard hydrochloric acid solution supply mechanism comprises a standard hydrochloric acid solution pool and a standard hydrochloric acid solution supply pipe connected with the standard hydrochloric acid solution pool, the end of the standard hydrochloric acid solution supply pipe is connected with the measuring pool, and a metering pump is installed on the standard hydrochloric acid solution supply pipe. According to the device, the titration end point is recognized through the pH electrode and the oxidation-reduction electrode, the device can adapt to pollution of impurities in separation water of oil fields, mining and the like, titration is directly conducted through a hydrochloric acid standard solution, phenolphthalein and methyl orange indicators do not need to be added, and the content of carbonate radicals, bicarbonate radicals and hydroxyl radicals in water can be accurately measured in real time.

Description

technical field [0001] The invention belongs to the field of chemical water quality analysis, in particular to a device and method for automatically measuring the concentration of carbonate / bicarbonate / hydroxide ions in water by using an anti-pollution pH electrode. Background technique [0002] Carbonate and bicarbonate are the main anions in the separated water of crude oil and other mining industries. Determining the concentration of carbonate and bicarbonate in the formation water during the mining process is helpful to determine the hardness and type of the 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. 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 t...

Claims

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Application Information

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IPC IPC(8): G01N31/16
CPCG01N31/164
Inventor 吕运昌陈云龙李蔚丁瑞峰边宝丽李擎
Owner HKY TECH
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