GB/T 8639.1-1988 Chemical analysis methods for vanadium - Potassium permanganate-ammonium ferrous sulfate titration method for the determination of vanadium content

This standard is applicable to the determination of vanadium content in metallic vanadium. Determination range: >90%. This standard is not applicable to the determination of vanadium content in samples with chromium content >1%. This standard complies with GB 1467-1978 "General Principles and General Provisions for Chemical Analysis Methods for Metallurgical Products". GB/T 8639.1-1988 Chemical Analysis Method for Vanadium Potassium Permanganate-Ammonium Ferrous Sulfate Titration Method for Determination of Vanadium Content GB/T8639.1-1988 Standard Download Decompression Password: www.bzxz.net

National Standard of the People's Republic of China
Chemical Analysis Method
Determination of Vanadium Content by Potassium Permanganate-Ferrous Sulfate Titration Method
VamadiumoonteniPotasuka permsnganntneuooniumFeroeailpha.valumerlc method This standard is applicable to the determination of vanadium content in the metal, and the range is formulated. This standard shall not be later than the use of three 1 for the determination of pores in the sample: DC: 689.292
CP 2639. 1-82
This standard complies with the general specification and method of chemical analysis of 148-7% gold products-1.1 Method improvement
The sample is decomposed with modified decomposition, and the residual energy is quantified in the absence of medium. In the presence of calcite, the excess concentration of alcohol is used as an indicator of the basic annual acid content of the rich base, and the standard concentration of ferrous metal is used as the standard concentration of gold. 2 Trial production
2-11.× g/mL).
2-241,12e/mLJ.
2.3p 1. 0 ).
2.4 Potassium bis(2.0%)
2.5 Permanent flow(2)%)
2. Sun resistance reduction (15
2. N-phenyloxy formic acid indicator 10.2%: Collect 2N-phenyltransferase chrysanthemum nail can be mixed in 10mL of sodium flower,
2.9 Information from the qualified content: sieve 1.U3UV first in: 2G110 Y.2h high energy pentoxide (luminosity 99.99, official ten 40 cup, 2 into about 10, 12.1, make all the elements and 100% acid, take out and cool, add 20 ~ 25mL, heat and cool, add 50 volume of water sample to the car, push, the result is 12g
2.9 ferrous acid standard reduction (PeSU.·S+IL.O about 0.[ol/].2.9.1 matching
3. 211 machine to the efficiency of CFn5,-(N,1,SH,O strict E m burning machine, into 3D L rat (+5 environment maintenance, transfer to: G0 agency, please take 596 to swim, change 2.9.2 standard || tt || transfer 100ml.t, standard drop, divide into 200)mL dry form plate, with your fixed age when the time reduction, add 12m sparse limit (.1 and 3 acid reduction +2.31.%, reduce to room group, the following loss 4.3.54.3.7 whole work, three groups The standard is applied again. The difference between the positive numbers of the standard drop flow should not exceed 0.05 yuan L. Take the average value (if not, it is determined by the new teacher). Calculate the titer of the vanadium in the standard iron ore according to formula (1). Approved by the Nonferrous Metals Industry Corporation on January 11, 1986 318
1989-01-01
Where T
CB B639. 1—88bzxz.net
The concentration of ferrous chrysanthemate in the standard solution is /mL: The volume of ammonium sulfate standard solution consumed during the calibration is /mL;
The volume of ferrous chrysanthemate in the blank test consumed during the calibration is /mL.
The test sample passed through the 31 sieve hole
4 Analysis steps
4.7 Test sample
1.000 & Sample.
4.2 Blank test
For the sample, do a blank test
4.3 Determination
4.3./Put the sample (4.13) in 5 mL of flask, add about 10 mL of water, 40 mL of aldehyde (2.1), 15 mL of nitric acid (2.23), slowly, after the reaction stops, put it in a dry furnace and heat it until the test solution is completely dissolved and the sulfur is slightly sulphurized, then cool it down, 4.3.2 Rinse the wall of the flask with 10-20 mL of water, mix it. It needs to be heated again on the electric furnace until the sulfur is slightly sulphurized, remove it and cool it slightly, slowly add 80-10 mL of water, heat it to dissolve the salt, remove it and cool it to room temperature. 4.33 Transfer the test solution (4.3.2) into a 500 mL container bottle and add water to about 400 mL, cool it to room temperature, and then dilute it with water to a temperature of 100-1000 °C.
4.3 4 Collect 1DD.D3mL test solution (4. 3.3) and place in a 30mL solution, add 11mL of acid [2.1], 3mL of phosphine (2.3) and place in a flask at room temperature.
4.35 Add potassium permanganate solution (2.4) dropwise until it turns slightly red and does not disappear. Add 1~2 drops of excess, mix thoroughly, and place for 5~10mln4.36 Add 10mL of urea (2.57. Add iodine (2.6) dropwise until the red color just disappears and add 1~2 drops of excess, mix thoroughly, and place for 1min.
4.3. Add 3 drops of N-phenylenediamine (2.7) indicator, and gradually reduce with ferrous sulfate. When the filtrate changes from dense red to green, the analysis result is calculated according to (2): V(%) = 0.05-V/T (%) - T/tt/| Where: T/tt/| is the titration degree of the standard ferrous acid solution, mL; the volume of the standard ferrous acid solution consumed during the titration is m: the titration ratio of the test solution! Sample volume, g. The analysis result is expressed to two decimal places. (2
6) The difference in the analysis results between laboratories is not significant. The following table lists the following: s
Additional Notes:
This standard was drafted by Jinzhou Jiao Alloy Factory, and the current standard was drafted by Jinzhou Tietai Alloy Factory. The founders of this standard are Zhao Jinkai and Qiu Yintong. 226
A Specification
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