Liquid analysis method and device adopting potentiometric titration
A liquid analysis device and the technology of potentiometric titration, which are applied in the field of analytical chemistry, can solve the problems of low accuracy, no indicator, and difficulty in indicating the end point, and achieve the effect of simple operation and high measurement accuracy
Inactive Publication Date: 2015-12-23
王竞
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Problems solved by technology
[0003] The common titration method relies on the color change of the indicator to indicate the end point of the titration, but the accuracy of this method is not high. If the solution to be tested is colored or turbid, it is difficult to indicate the end point, or no suitable indicator can be found at all.
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[0036] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.
[0037] figure 1 The flow chart of the liquid analysis method using the potentiometric titration method provided by the embodiment of the present invention. Combine below figure 1 The liquid analysis method using the potentiometric titration method provided in this example will be described.
[0038] The method comprises the steps of:
[0039] Step 110, pre-cleaning the analysis cup;
[0040] Specifically, before liquid analysis, the analysis cup needs to be emptied and cleaned first. Cleaning can use deionized water and other cleaning liquids, and the number of cleanings is preferably twice.
[0041] Specific steps for pre-cleaning may include:
[0042] Step 111, draining the analysis cup;
[0043] Step 112, injecting cleaning liquid into the analysis cup and stirring;
[0044] Step 113, drain the cleaning liqu...
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An embodiment of the invention relates to a liquid analysis method and device adopting potentiometric titration. The method comprises the following steps: a to-be-analyzed solution is added to an analysis cup; a reference electrode and an indicator electrode are inserted into the to-be-analyzed solution, wherein the potential of the reference electrode is constant, and the potential of the indicator electrode has a functional relation with the activity of to-be-detected ions in the to-be-analyzed solution; the to-be-analyzed solution is quantified, redundant solution is drained, and a set quantity of the to-be-analyzed solution is left; a titration reagent is added to the to-be-analyzed solution at a set titration rate, the mixture is stirred continuously, so that the activity of the to-be-detected ions in the to-be-analyzed solution changes continuously, and the potential of the indicator electrode changes continuously; when the potential change rate of the indicator electrode surpasses the set threshold value, a titration end-point trigger signal is generated, and continuous adding of the titration reagent is stopped according to the titration end-point trigger signal; the activity of the to-be-detected ions in the to-be-analyzed solution is determined according to the dosage of the added titration reagent.
Description
technical field [0001] The invention relates to the technical field of analytical chemistry, in particular to a liquid analysis method and device using potentiometric titration. Background technique [0002] Liquid analysis is widely used in various fields. Among them, the titration analysis method is a kind of chemical analysis method. A reagent solution whose exact concentration is known is added dropwise to the solution of the substance to be tested until the chemical reaction is complete, and then according to the concentration of the reagent solution used and the The volume can be used to obtain the content of the measured component. This method is called titration analysis. [0003] The common titration method relies on the color change of the indicator to indicate the end point of the titration, but the accuracy of this method is not high. If the solution to be tested is colored or turbid, it is difficult to indicate the end point, or no suitable indicator can be fou...
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IPC IPC(8): G01N31/16G01N27/26
Inventor 王竞张晓宁
Owner 王竞