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Measuring method of iron

A measurement method, lithium iron phosphate technology, applied in the field of detection, can solve the problems of expensive instruments and consumables, high cost, cumbersome testing process, etc.

Active Publication Date: 2012-07-18
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the spectrophotometric method used in the prior art has disadvantages such as expensive instruments and consumables, cumbersome testing process, etc., and the cost is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Instruments and medicines: 10mL colorimetric tube, 100mL polyethylene bottle (with inner lining), potassium thiocyanide (analytical pure), nitric acid (analytical pure), 1000ppm Fe 3+ Iron standard solution (excellent grade)

[0041] Determination steps:

[0042] Configuration of potassium thiocyanate solution: Weigh 25 g of potassium thiocyanide, add pure water to dissolve, and set the volume to 100 mL to obtain a potassium thiocyanide solution with a mass volume concentration of 25% g / ml.

[0043] Sample pretreatment: take lithium iron phosphate and bake at a high temperature of 120° C. for 4 hours.

[0044] Test the dissolution of iron at room temperature: Weigh 5.0000g of lithium iron phosphate material, pipette 50mL of electrolyte solution and add it, shake it well and store it sealed for 2 days, filter it with qualitative double-layer filter paper, put the filtrate in a plastic beaker and label it, and get First test solution.

[0045] High-temperature test for...

Embodiment 2～4

[0050] Using the detection method in Example 1, respectively, the amount of iron dissolution was measured for lithium iron phosphate produced by different manufacturers.

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Abstract

The invention discloses a measuring method of iron. The measuring method comprises the following steps of: preparing multiple Fe<3+> standard solutions with different concentrations; respectively adding a first nitric acid solution and a first potassium thiocyanate solution into the multiple Fe<3+> standard solutions so as to carry out a color reaction; preparing a solution to be tested by taking a ferric phosphate lithium sample, and adding the second nitric acid solution and the second potassium thiocyanate solution into the solution to be tested so as to carry out the color reaction; and carrying out color comparison on the solution to be tested after the color reaction and the Fe<3+> standard solutions after multiple color reactions, thus obtaining iron content in the solution to be tested according to a color comparison result. Compared with the ration measuring method in the prior art, the measuring method provided by the invention utilizes a semi-quantitative colorimetric method to measure the iron content in the solution to be tested, the measured result of the method is exact and reliable, the operation is simple, the application is broad, and the cost is lower.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to an iron determination method. Background technique [0002] In recent years, with the increasing depletion of resources and the emergence of issues such as global warming, green and low-carbon lifestyles have been advocated. Among them, the development of electric vehicles and hybrid electric vehicles to partially replace internal combustion engine vehicles that consume fossil fuels is one of the main methods to solve the energy crisis and environmental degradation. Driving power is a key component that affects the popularization and use of electric vehicles. Today, widely used driving power includes lead-acid batteries, nickel metal hydride / nickel cadmium, lithium ion batteries, etc. Among various driving power sources, lithium-ion batteries have been extensively studied due to their advantages such as high energy density, good cycle performance, low self-discharge rate, long...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 姚瑞环王淑霞宋洁申津婧
Owner TIANJIN ENERGIES
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