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A Potentiometric Titration Method for Measuring Fe2+ Concentration in Solution

A potentiometric titration and concentration technology, applied in the direction of material electrochemical variables, etc., can solve the problems of application limitations, color interference, high cost, etc., and achieve the effects of wide application range, cost reduction, and simple operation

Inactive Publication Date: 2016-02-03
QIQIHAR UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the chemical titration method is mainly potassium dichromate titration method, which is a common method for determining ferrous iron. 2+ Oxidized to Fe 3+ , due to the generated yellow Fe 3+ It will interfere with the color of the indicator (such as sodium diphenylamine sulfonate) indicating the end point of the titration. Therefore, phosphoric acid should be added in this method to make phosphoric acid and Fe 3+ Generate colorless complex ions to mask the color of ferric iron, but when the concentration of ferric iron generated exceeds the masking ability of phosphoric acid, the titration will fail because the end point cannot be found; the current potentiometric titration method is used to measure Fe in solution 2+ For ion content, two electrodes are required: the inert metal platinum electrode is used as the indicating electrode, and the saturated calomel electrode is used as the reference electrode, which makes the cost higher, and because the calomel electrode and the platinum electrode can only be used in potentiometric titrators , making its application limited

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  • A Potentiometric Titration Method for Measuring Fe2+ Concentration in Solution
  • A Potentiometric Titration Method for Measuring Fe2+ Concentration in Solution
  • A Potentiometric Titration Method for Measuring Fe2+ Concentration in Solution

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specific Embodiment approach 1

[0012] Specific embodiment 1: In this embodiment, a method for measuring Fe in solution 2+ The potentiometric titration of concentration is carried out according to the following steps:

[0013] 1. Prepare titrant potassium dichromate standard aqueous solution or titrant hydrochloric acid standard mixed solution;

[0014] The concentration of potassium dichromate in the titrant potassium dichromate standard aqueous solution is 0.001672 mol / L to 0.01672 mol / L;

[0015] The preparation steps of the titrant hydrochloric acid standard mixture are as follows: dilute concentrated hydrochloric acid with distilled water into a hydrochloric acid aqueous solution with a HCl concentration of 0.3±0.005mol / L, and then calibrate the hydrochloric acid aqueous solution with a HCl concentration of 0.3±0.005mol / L Determine the exact concentration of HCl in the hydrochloric acid aqueous solution with a HCl concentration of 0.3±0.005mol / L as C. Dilute the hydrochloric acid solution with a concentration ...

specific Embodiment approach 2

[0019] Specific embodiment two: this embodiment is different from specific embodiment one in that: the preparation method of the titrant potassium dichromate standard aqueous solution in step one: first place the potassium dichromate at a temperature of 150°C to 180°C Dry for 2h~3h under conditions to obtain dry potassium dichromate, then weigh 4.9171g of dry potassium dichromate into a 100mL beaker, add deionized water and stir to dissolve, transfer to a 1000mL volumetric flask, use deionized water Dilute the volume to the mark to obtain a standard aqueous solution of potassium dichromate with a concentration of 0.01672mol / L, and then dilute it with deionized water for 0-10 times to obtain potassium dichromate with a concentration of 0.001672mol / L~0.01672mol / L Standard aqueous solution. Others are the same as the first embodiment.

specific Embodiment approach 3

[0020] Specific embodiment three: This embodiment is different from one of specific embodiments one or two in that the concentration of the titrant potassium dichromate standard aqueous solution in step one is 0.005 mol / L to 0.01 mol / L. Others are the same as the first or second embodiment.

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Abstract

The invention discloses a potentiometric titration method for measuring the concentration of Fe<2+> in a solution, relates to a potentiometric titration method and aims to solve the technical problems that the cost for measuring the content of Fe<2+> ions in the solution by the conventional potentiometric titration method is high because two electrodes, namely an inert metal platinum electrode serving as an indicating electrode and a saturated calomel electrode serving as a reference electrode, are required to be used and the application of the calomel electrode and the application the platinum electrode are limited because the two electrodes can be only used on a potentiometric titrator. The potentiometric titration method disclosed by the invention comprises the steps of 1, preparing a titration agent; and 2, measuring the concentration of the Fe<2+> in the solution by the potentiometric titration method. The potentiometric titration method disclosed by the invention is mainly applied to measurement of the concentration of the Fe<2+> in the solution.

Description

Technical field [0001] The invention relates to a potentiometric titration method. Background technique [0002] Iron element is an element widely present in nature, and an element widely contacted and used in human life. Iron-containing substances that need to be determined are also very common, such as food, medicine, feed, minerals, soil, water purifiers, chemical raw materials, fine chemical products, etc. With the widespread application of iron, people have also made continuous explorations and attempts on the determination of iron-containing substances. At present, the main methods for determining the content of divalent iron are chemical titration and potentiometric titration. Among them, the main chemical titration method is potassium dichromate titration method, which is a common method for the determination of divalent iron. This method is to use potassium dichromate to remove Fe under acidic conditions. 2+ Oxidized to Fe 3+ , Due to the generated yellow Fe 3+ It will...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/42
Inventor 翟丽萍李波王世伟刘军宋春丽
Owner QIQIHAR UNIVERSITY