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Device and method for measuring alkalinity of water sample

A technology of measuring device and measuring method, which is applied in the direction of measuring device, transmittance measurement, chemical method analysis, etc., can solve the problems of different judgment end points, phenolphthalein alkalinity total alkalinity content error, standard acid solution dosage error, etc., to achieve adaptability Strong environmental capabilities, guaranteed accuracy, online and real-time measurement effects

Pending Publication Date: 2021-12-10
HKY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And because the pH range of the discoloration of phenolphthalein is 8.2-10.0, the pH range of the discoloration of methyl orange is 3.1-4.4, within the discoloration range of the indicator, there is a problem that different personnel judge different end points, which may easily cause errors in the amount of standard acid solution. Causes errors in the calculation of phenolphthalein alkalinity and / or total alkalinity

Method used

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  • Device and method for measuring alkalinity of water sample
  • Device and method for measuring alkalinity of water sample
  • Device and method for measuring alkalinity of water sample

Examples

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Embodiment 1

[0050] Such as figure 1As shown, this embodiment discloses a water sample alkalinity measuring device, which includes a controller 1 , a measuring component 2 and a sample adding component 3 . Wherein the measuring part 2 comprises a water sample container 21, a transmitting module 22 and a receiving module 23, the water sample container 21 is used to place the water sample to be measured, the transmitting module 22 and the receiving module 23 are all electrically connected to the controller 1, and the transmitting module 22 and The receiving module 23 is relatively arranged on both sides of the water sample container 21. Under the control of the controller 1, the transmitting module 22 can stably emit light of a fixed wavelength, and the light is received by the receiving module 23 after passing through the water sample to be tested.

[0051] Further, the sample adding part 3 of the present embodiment includes a first quantitative pump 31, a second quantitative pump 32 and a ...

Embodiment 2

[0057] This embodiment discloses a method for measuring the alkalinity of a water sample, which is carried out by using the device for measuring the alkalinity of a water sample in Example 1, comprising the following steps:

[0058] Step (1), take the water sample to be tested and place it in the water sample container, record the volume of the water sample to be tested as V, and record the received voltage value of the water sample to be tested as the blank voltage value A0; After the 490nm transmitting module and receiving module are preheated for 5 minutes, to ensure that the accuracy of the transmitting module and receiving module itself is not affected by temperature changes, then take 100mL of the water sample to be tested and place it in the water sample container, that is, V=100mL.

[0059] Step (2), add phenolphthalein indicator to the water sample to be tested, record the received voltage value of the water sample to be tested as the initial voltage value A 1 ; where...

Embodiment 3

[0072] As another embodiment of the present invention, this embodiment also discloses a method for measuring the alkalinity of a water sample, which is carried out by using the device for measuring the alkalinity of a water sample in Example 1, comprising the following steps:

[0073] Step (1), take the water sample to be tested and place it in the water sample container, record the volume of the water sample to be tested as V, and record the received voltage value of the water sample to be tested as the blank voltage value A 0 ; Specifically, after preheating the transmitting module and receiving module containing a specific wavelength of 490nm for 5 minutes, to ensure that the accuracy of the transmitting module and receiving module itself will not be affected by temperature changes, then take 100mL of the water sample to be tested and place it in the water sample In the container, that is, V=100mL.

[0074] Step (2), add phenolphthalein indicator to the water sample to be t...

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Abstract

The invention relates to a device and a method for measuring the alkalinity of a water sample. The device comprises a controller, a measuring part and a sample adding part. The measuring part comprises a water sample container, an emitting module and a receiving module. Light emitted by the emitting module and the receiving module penetrates through a water sample to be measured, the received voltage value of the water sample to be measured is measured, so that two titration end points are accurately identified according to the change of the voltage value. Automatic titration and measurement are realized, manual titration and manual end point judgment are completely replaced, relevant standards and methods are met, and the phenolphthalein alkalinity and total alkalinity of water can be accurately measured in real time. Compared with the method for determining the color change range of an indicator by observing the color change of the indicator with naked eyes, the device and the method have the advantages that the problem that different persons judge different terminal points is avoided, the measurement accuracy is ensured, the environment adaptability is high, and online and real-time measurement can be realized.

Description

technical field [0001] The invention belongs to the technical field of ion content monitoring, and in particular relates to a water sample alkalinity measuring device and method. Background technique [0002] The alkalinity of water refers to the amount of substances in the water that can accept hydrogen ions, such as hydroxide, carbonate, bicarbonate, phosphate, hydrogen phosphate, silicate, bisilicate, sulfite , humate and ammonia, etc., are common alkaline substances in water, and they all react with acids. Alkalinity is a very important indicator for industrial boilers / industrial circulating cooling equipment. It is necessary to control the amount of sodium carbonate and other substances added according to the alkalinity to maintain the appropriate alkalinity of the boiler water components, so that calcium ions, magnesium ions, carbonic acid The content of ions such as root, phosphate and hydroxide is maintained at the optimal ratio, so that calcium and magnesium can fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/22G01N31/16G01N21/59
CPCG01N31/221G01N31/164G01N21/59
Inventor 吕运昌陈云龙边宝丽
Owner HKY TECH
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