SJ/T 10942-1996 Analysis of sulfur in color picture tube glass SJ/T10942-1996 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Analysis of sulfur(S)in color picture tube glass
GB9474.7-88
Reduced to SJ/T10942-96
This standard specifies the analysis of sulfur in glass and is applicable to the analysis of sulfur as an impurity in electronic glass such as color picture tubes and black and white picture tube glass shells. This method should be analyzed in accordance with the provisions of GB9000.1 "General Principles for Chemical Analysis of Electronic Glass". 1. Method Summary
The sample is decomposed with hydrofluoric acid and perchloric acid, dissolved in hydrochloric acid and then chlorinated to precipitate barium sulfate, filtered, burned and weighed, and the sulfur content in the sample is calculated.
2 Reagents and solutions
2.1 Hydrochloric acid 1:1;
2.2 Perchloric acid;
2.3 Hydrofluoric acid,Www.bzxZ.net
2.4 Nitric acid;
2.5 Fluoride solution 10%,
2.6 Magnesium nitrate,
2.7 Boric acid.
3 Analysis steps
3.1 Coarsely crush the sample, remove the iron and grind it in an agate mortar, pass it through a standard sieve with a pore size of 0.120mm, dry it at 110℃ for 1h, put it in a desiccator and cool it to room temperature for use. 3.2 Weigh 3.00g of the above powder sample (3.1) in a platinum dish, moisten it with a little water, add 1ml nitric acid, 10ml perchloric acid, 25ml hydrofluoric acid, and 0.2g magnesium nitrate, and mix well. Heat at low temperature for 2~3min, then gradually increase the temperature to evaporate until white pernitrogen smoke begins to appear. 3.3 Remove the platinum blood and let it cool, add 10ml of hydrofluoric acid and mix well. Continue heating and evaporating until white perchloric acid smoke appears for 5min. 3.4 Remove the platinum blood, cool it, and clean the inner wall of the platinum dish with 5ml of perchloric acid. Heat again until white perchloric acid smoke appears for 2~3min. 3.5 After cooling, add about 58 of boric acid, rinse the inner wall of the platinum dish with a small amount of water, shake it well, and heat and evaporate until it becomes a thick syrup. 3.6 After cooling, add 5~10ml of salt (1:1) and 50ml of hot water in sequence. Heat in a water bath to dissolve the soluble salts, then transfer to a 300ml beaker, dilute to 200ml with hot water, and heat to boiling. 3.7 Add 10ml of hot chlorinated solution while stirring, keep it slightly boiling for 10min, heat it in a water bath for 1n, and leave it at room temperature for more than 2h. 3.8 Filter with quick filter paper, wash the precipitate with hydrochloric acid (1:50) 4-5 times, and then wash with warm water until there is no chloride ion. 3.9 Put the precipitate together with the filter paper in a constant weight porcelain crucible, heat the filter paper at low temperature to ashing, and then burn it at 700-800℃ for 30 minutes. After cooling in a dryer, weigh it to constant weight.
4 Calculation
Approved by the Ministry of Electronics Industry of the People's Republic of China on April 29, 1988TTTKKAca
Implementation on December 1, 1988
The sulfur trioxide content in the sample is calculated according to the following formula. GB9474.7-88
SO % =× 0. 3430
W-sample amount, 8;
0.3430—conversion factor.
Additional Notes:
This standard was drafted by Factory 4100 of the Ministry of Electronics Industry and the Standardization Research Institute. 2
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