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Method for determining concentration of ferrovanadium ions in mixed solution

A mixed solution and ion concentration technology, applied in the field of electrolysis, can solve the problems of expensive instruments, inability to test mixed solutions of iron and vanadium, and inability to obtain the concentration

Pending Publication Date: 2022-04-15
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although ICP spectroscopy has high accuracy and low detection limit, the instrument is expensive and can only measure the concentration of total vanadium and total iron, but cannot obtain the concentration of iron and vanadium in each valence state
Moreover, the above methods are for testing iron or vanadium alone, and cannot test the mixed solution of iron and vanadium.

Method used

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  • Method for determining concentration of ferrovanadium ions in mixed solution

Examples

Experimental program
Comparison scheme
Effect test

preparation example

[0073] Solution 1: Prepare tetravalent vanadium (VO) with 3mol / L sulfuric acid 2+ ) Solution 1 with a concentration of 1.0 mol / L, and determine the concentration with a potentiometric titrator.

[0074] Solution 2: Prepare ferrous iron (Fe) with 3mol / L sulfuric acid 2+ ) Solution 2 with a concentration of 1.0 mol / L, and determine the concentration with a potentiometric titrator.

[0075] Solution 3: prepare ferric iron (Fe) with 3mol / L sulfuric acid 3+ ) Solution 3 with a concentration of 1.0 mol / L, and determine the concentration with a potentiometric titrator.

[0076] Solution 4: Electrolyze solution 1 to divalent vanadium (V 2+ ) concentration is 0.7mol / L, trivalent vanadium (V 3 + ) concentration is 0.3mol / L.

[0077] Solution 5: Prepare KMnO with a molar concentration of 0.02mol / L 4 solution as standard solution V, and for KMnO 4 The solution was calibrated with an accurate concentration of 0.0183mol / L.

[0078] Solution 6: Prepare a mixed buffer solution with a...

Embodiment 1

[0081] Take 0.5mL (solution one) tetravalent vanadium and 50ml (solution six) sulfuric acid phosphate buffer in a 100mL beaker. Using a fully automatic potentiometric titrator, drop (solution five) 0.0183mol / L of KMnO into the beaker 4 Standard solution, record the volume of potassium permanganate solution consumed when the first potential jump point is obtained, 5.5390mL. Continue to drop KMnO 4 solution, the solution is purple, indicating that all vanadium exists in the pentavalent state, KMnO 4 Excess solution.

[0082] The concentration of tetravalent vanadium is

[0083] C V(IV) = 5 x 5.5390 mL x 0.0183 mol / L ÷ (0.5 mL) = 1.0136 mol / L.

Embodiment 2

[0085] Take 0.5mL (solution two) of ferrous iron and 50ml (solution six) of sulfuric acid phosphate buffer in a 100mL beaker. Using a fully automatic potentiometric titrator, drop (solution five) 0.0183mol / L of KMnO into the beaker 4Standard solution, record the volume of potassium permanganate solution consumed when the first potential jump point is obtained: 6.0400mL. Continue to drop KMnO 4 solution, the solution is purple, indicating that all iron exists in the trivalent state, KMnO 4 Excess solution.

[0086] The concentration of ferrous iron is C FeII = 5 x 6.04 mL x 0.0183 mol / L ÷ (0.5 mL) = 1.1053 mol / L.

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Abstract

The invention discloses a method for determining the concentration of iron and vanadium ions in a mixed solution. The mixed solution contains iron ions and vanadium ions. The iron ions are selected from ferrous ions or / and ferric ions; the vanadium ions are selected from at least one of divalent vanadium ions, trivalent vanadium ions or tetravalent vanadium ions; the method at least comprises the following steps: titrating a mixed solution through a potassium permanganate standard solution, and indicating a potential corresponding to a potential jump point of the mixed solution in the titration process by using an electrode; and finally, calculating the concentration of ferrovanadium ions in the mixed solution according to the consumption of the potassium permanganate standard solution when the mixed solution reaches the potential jump point potential. The method can be used for accurately and quickly measuring the concentration of the ions with various valence states in the ferrovanadium electrolyte, and has the advantages of simplicity and convenience in operation and low cost.

Description

technical field [0001] The invention relates to a method for measuring the concentration of iron and vanadium ions in a mixed solution, belonging to the technical field of electrolysis. Background technique [0002] Hydrogen sulfide is a poisonous and harmful gas, which mainly comes from petroleum and natural gas extraction and processing, coal chemical industry and other industries. In recent years, the new technology of using indirect electrolysis to treat hydrogen sulfide has gradually attracted people's attention. In the indirect hydrogen sulfide electrolysis process, iron ion redox couples are used as the medium to electrolyze hydrogen sulfide at normal temperature and pressure to produce hydrogen at the same time. and isolate the sulfur. However, it was found during the operation of the reaction that the iron ions in the anode compartment and the vanadium ions in the cathode compartment penetrate each other through the electrolytic cell diaphragm. This interlinking o...

Claims

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Application Information

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IPC IPC(8): G01N31/16
Inventor 李灿郑曌雯刘铁峰张伟王庆楠刘欣毅
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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