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02
2025
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07
The determination of iron content in dysprosium iron alloy by potentiometric titration
I. Preface
Dysprosium-iron alloy is a kind of metallic alloy, which is an alloy containing the rare earth element dysprosium and iron. It is mainly used in neodymium iron boron permanent magnetic materials, manufacturing supermagnetostrictive alloys, optical and magnetic recording materials, nuclear fuel diluents, etc. Its price is not only influenced by supply and demand, but also closely related to its quality. This experiment aimed to determine whether the iron content in the dysprosium iron alloy produced by a certain manufacturer met the standards. The JH-T6 fully automatic potentiometric titrator was used for measurement, and the endpoint was determined based on the potential jump point to measure the content.
Ii. Instruments and Reagents
2.1 Instruments
JH-T6 fully automatic potentiometric titrator, composite platinum electrode, pipette, etc
2.2. Reagents
250g/L sodium tungstate solution, phosphorus-sulfur mixed acid, 100g/L sulfosalicylic acid, commercially available titanium trichloride solution, 0.003mol/L potassium dichromate, c(1/6 kCr2 O7)=0.01mol/L potassium dichromate, deionized water
Iii. Experimental Methods
3.1 Experimental Process:
Accurately transfer 5mL of the dissolved dysprosium iron alloy sample with a 5mL pipette and place it in the titration cup. Then, transfer 40mL of deionized water with a graduated cylinder and place it in
In the titration cup, add 10 ml of phosphorus-sulfur mixed acid, 1mL of sodium tungstate solution, and a few drops of titanium trichloride solution until blue appears, then add an excess of 1-2 drops.
Adjust to a light blue color with 0.003mol/L potassium dichromate solution and ignore the reading.
Add another 10mL of phosphorus-sulfur mixed acid, place it on the titration stand, start the prepared method, and use the calibrated 0.01mol/L potassium dichromate drop
The titration ends when the potential spike endpoint is reached.
3.2 Instrument Parameters
The parameter Settings of the JH-T6 fully automatic potentiometric titrator are shown in Table 1
Table 1 Parameter Settings of Titrator
| Titration type | Dynamic titration | method name | Determination of iron content in dysprosium iron alloy |
| Burette volume: |
10mL |
Burette volume: |
g |
|
Working electrode: |
Composite platinum electrode. |
Reference electrode: |
无 |
| Display unit: |
mV |
replacement speed: |
5 |
| Stirring speed |
7 |
Pre-stirring time |
5s |
| Electrode equilibrium time |
4s |
Electrode equilibrium potential |
1mv |
| Titration speed | Standard | Equilibrium potential before titration |
10mv |
| Pre-added volume: |
20mL |
Pre-titration stirring time: |
15s |
| Minimum addition volume |
0.02mL |
Final volume |
20mL |
| Potential spike |
200 |
Pre-controlled mv value |
无 |
| Correlation coefficient |
16.755 |
Result unit: |
% |
| Titrant name: | Potassium dichromate | Theoretical concentration: | 0.01(calibrated concentration) |
Iv. Results and Discussion
4.1 Experimental Results
The samples were tested and the experimental results are shown in Table 2
Table 2 Test Results of iron Content in dysprosium iron alloy
4.2. Conclusion
The content of dysprosium iron alloy was determined to be 19.82% through potentiometric titration in this test, which met the production requirements. Moreover, the use of instruments for judgment has decreased
It has eliminated human errors and greatly improved the accuracy of the experiment. Potentiometric titration is a good choice for testing such samples.
V. Precautions
When configuring and calibrating the concentration of potassium dichromate, it is necessary to distinguish whether it is c(1/6K2Cr2O7)/ (mol/L) or c(K2Cr2O7)/ (mol/L).
=0.01mol/L; otherwise, it will lead to problems with the results.
Vi. References
[1] GB/T 26416.4-2010 Determination of iron content in dysprosium iron Alloy.
Keyword:
potentiometric titration
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