This standard is applicable to the determination of the total amount of rare earth oxides in fluorescent grade yttrium oxide and europium oxide. Determination range: 95% to 100%. This standard complies with GB 1467-78 "General Principles and General Provisions for Chemical Analysis Methods for Metallurgical Products". GB/T 8762.1-1988 Determination of the total amount of rare earth oxides in fluorescent grade yttrium oxide and europium oxide - Disodium ethylenediaminetetraacetic acid volumetric method GB/T8762.1-1988 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Determination of total rare earth oxide content in fluorescent grade yttrium oxide and europium oxide-EDTA volumetric method
UDC661.866+661
.866.1 : 543.062
GB 8762.1-.88
This standard is applicable to the determination of the total amount of rare earth oxides in fluorescent grade yttrium oxide and europium oxide. Determination range: 95% to 100%. This standard complies with GB1467-78 "General Principles and General Provisions for Chemical Analysis Methods of Metallurgical Products". 1 Method Summary
The sample is dissolved in hydrochloric acid. At pH 5.5, with xylenol orange as the indicator, titrate to the endpoint with disodium ethylenediaminetetraacetic acid (EDTA) standard solution.
2 Reagents
2.1 Hydrochloric acid (1+1).
2.2 Ammonia (1+1).
2.3 Cresol orange solution, (0.1%).
2.4 Hexamethylenetetramine buffer solution (pH5.5): Weigh 200g hexamethylenetetramine in a 500mL beaker, add 200mL water to dissolve, add 70mL hydrochloric acid, mix well, place in a 1000mL volumetric flask, dilute to scale with water, and mix well. 2.5 Disodium ethylenediaminetetraacetic acid (EDTA) standard solution (0.02000mo1/L): Weigh 14.889g of standard EDTA dried at 80C for 2h in a 250mL beaker, dissolve in a small amount of water, transfer to a 2000mL volumetric flask, dilute to scale with water, and mix. The concentration of this standard solution is 0.02000mol/L. Www.bzxZ.net
2.6 Precision pH test paper.
2.7 Platinum 25~～30 mL).
3 Equipment
High temperature furnace (greater than 1000℃).
4 Analysis steps
4.1 Sample treatment
Put the sample in a platinum crucible (2.7), put it in a high temperature furnace at 1000℃ and burn it for 1h. After taking it out, put it in a desiccator and cool it to room temperature. 4.2 Determination quantity
Weigh 2 samples for determination and take the average value. 4.3 Sample quantity
Weigh 0.5000g of sample (4.1).
4.4 Determination
4.4.1 Place the sample (4.3) in a 100mL beaker, add 5mL hydrochloric acid (2.1), cover the surface blood, and slowly heat dissolve on an electric furnace. After cooling, transfer to a 100mL volumetric flask, dilute to the mark with water, and mix. 4.4.2 Transfer 10.00ml. of solution (4.4.1) to a 250mL conical flask, add 40mL water, adjust the solution pH to 5~5.5 with nitrogen water (2.2) and hydrochloric acid (2.1), add 10mL hexamethylenetetramine buffer solution (2.1), and mix. Add two drops of cresol orange solution (2.3) and titrate with EDTA standard solution (2.5) until the solution changes from purple to bright yellow, which is the end point. Record the volume of EDTA standard solution consumed.
Calculation of analysis results
Calculate the percentage of rare earth oxides in oxidation according to the following formula: Y,0(%) - 225. 81/2
Calculate the white content of rare earth oxides in oxidation according to the following formula: VMV,
m - V, X 103
Eu,0,(%) = 351. 91/2 :
t: V is the volume consumed by disodium ethylenediaminetetraacetic acid (EDTA) standard solution, mLM — the concentration of disodium ethylenediaminetetraacetic acid (EDTA) standard solution, mol/L; total volume of test solution, mL;
—--the volume of test solution taken, mL;
6 is the allowable difference
sample volume.
The difference in analysis results between laboratories should not be greater than the allowable difference listed in the table below. Total amount of rare earth oxides
>99~～100
Additional remarks:
This standard was drafted by Beijing General Research Institute of Nonferrous Metals and Shanghai Yuelong Chemical Plant. This standard was drafted by Shanghai Yuelong Chemical Plant. The main drafters of this standard are Lu Shixin and Lin Wenying. Allowable difference
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