HG/T 2347.6-1992 γ. Determination of chloride in water-soluble Fe2O3 magnetic powder

HG/T 2347.6-1992 Determination of water-soluble chloride in γ.Fe2O3 magnetic powder HG/T2347.6-1992 Standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
Determination of water-soluble chloride in YFeO2 magnetic powder
1 Subject content and scope of application
This standard specifies the determination method for the total amount of water-soluble chloride in YFeO2 magnetic powder for magnetic recording HG/T2347.6-92
This standard is applicable to the determination of water-soluble chloride content in YFeO2 magnetic powder and modified powder for magnetic recording 2 Method Summary
The silver nitrate solution titration method is adopted.
3 Reagents and solutions
All reagents used are analytically pure.
3.1 Standard silver nitrate titration solution: c (AgNO) -0.01mol/L: 3.2 Potassium chromate solution:
K,Cro,) = 0. 5mol / L;
3.3 Distilled water or water with the same purity as distilled water. 4 Instruments and equipment
General laboratory instruments;
4.1 pH meter: accuracy 0.1 pH;
4.2 Glass filter: pore size 4~16μm. 5 Determination steps
Take at least two samples for parallel determination, 5.1 Weigh 10g of Y.FeO and magnetic powder sample (accurate to 0.001g), put it in a 500mL beaker, add 150mL distilled water, stir and boil for 5min, filter with a glass filter while hot, and rinse the Y, FeO and magnetic powder on the filter with hot distilled water 5~6 times. Transfer the filtrate to a 250mL volumetric flask, add distilled water to the scale, shake well, and set aside. 5.2 Use a pipette to draw 50mL of filtrate, inject it into a 250mL conical flask, add 1mL of potassium chromate solution, and slowly titrate with silver nitrate standard titration solution under sufficient shaking until the light reddish brown color does not disappear, and record the volume of silver nitrate standard titration solution consumed Vi
Blank test, add 1mL of potassium chromate solution to 50mL of distilled water, and use silver nitrate standard titration solution to drop until the color is consistent with the previous titration, and record the volume of silver nitrate standard titration solution consumed V. The endpoint can also be determined by potentiometric titration. 6 Calculation of determination results
Calculate the percentage of water-soluble chloride (in terms of CI) according to the following formula x Approved by the Ministry of Chemical Industry of the People's Republic of China on June 1, 1992 16
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1993-03-01 Implementation
Where: V.
Allowance difference
HG/T2347.6-92
x5×0.03546×100
The volume of standard silver nitrate solution (3.1) consumed in the blank test, mL; The volume of standard silver nitrate solution (3.1) consumed in the sample, mL; The mass of y·Fe,O, magnetic powder sample, g;
The mass of chloride ions equivalent to 1.00mL standard silver nitrate solution (c(AgNO.)) 0.01mo1/L), expressed in grams. bzxz.net
The allowable difference of the parallel determination results of this method is less than 10% of the higher value. The arithmetic mean of the parallel determination results is taken as the determination result and reported to the second decimal place. Additional notes:
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is managed by the Magnetic Recording Material Standardization Technical Management Unit of the Ministry of Chemical Industry. This standard was drafted by the First Film Factory of the Ministry of Chemical Industry and Guangzhou Magnetic Material Chemical Factory. Standards are available on mm.bzsoco.com. Free download of various standard industry materials
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