This standard specifies the determination of copper in high-purity quartz sand. This standard is applicable to the analysis of various grades of high-purity quartz sand. SJ 3228.6-1989 Determination of copper in high-purity quartz sand SJ3228.6-1989 Standard download decompression password: www.bzxz.net
This standard specifies the determination of copper in high-purity quartz sand. This standard is applicable to the analysis of various grades of high-purity quartz sand.

Standard of the Ministry of Machinery and Electronics Industry of the People's Republic of China Determination of copper in high-purity quartz sand
1 Subject content and scope of application
1.1 Subject content
This standard specifies the determination of copper in high-purity quartz sand. 1.2 Scope of application
This standard is applicable to the analysis of high-purity quartz sand of various grades. 2 Reference standards
SJ3228.2—89 General rules for analysis of high-purity quartz sand. 3 Method summary
SJ3228.6—89
In a medium with a H of 5.7 to 9.2, iron is masked with citric acid, divalent copper and copper reagent form a yellow complex, which is extracted with isoamyl alcohol for colorimetric determination.
4 Reagents
4.1 Hydrofluoric acid: 40%
4.2 Nitric acid: 1:1,
4.3 Hydrochloric acid: 1.1#
4.4 Ammonium hydroxide: 1:1,
4.5 Phenol crisp indicator: 0.1% ethanol solutionbZxz.net
4.6 Ammonium citrate solution: 20%,
4.7 Copper reagent: 0.1%,
Weigh 0.1g of copper reagent and dissolve it in 100ml water. If there is precipitation, filter it and store it in a brown bottle. 4.8CuSO..5H,0,
4.9 Copper standard solution: 0.001mgm1-l. Weigh 0.393g of copper sulfate (CuSO, 5H, O) and dissolve it in water. Transfer it into a 1000ml volumetric flask, dilute to the scale, shake well and set aside.
5 Analysis steps
Accurately weigh 1 g of the sample dried at 110℃, place it in the lining of a high-pressure crucible, moisten it with water, add 6ml hydrofluoric acid: 1ml hydrochloric acid, gently shake the spoon, cover the lining, put it in a stainless steel sleeve, tighten the lid, place it in a constant temperature drying oven and dissolve it at 145℃ for 2h. After cooling to room temperature, open the lid and gently push out the lining. Place the diffuser on a 120℃ hot plate and evaporate to dryness. Add 2ml of 1:1 hydrochloric acid to dissolve the residue, transfer to a 25ml colorimetric tube with a 10ml scale, add 2ml of 20% ammonium citrate, add a drop of 0.1% phenolic indicator, neutralize with 1,1 ammonium hydroxide to a slightly reddish color, add 2ml of copper reagent and 2ml of isoamyl alcohol, dilute to 10ml with water, shake for 1min, and compare with the copper standard color scale. At the same time, use the same conditions as the reagent blank, and use a micropipette to drop the copper standard solution to prepare a standard color scale for comparison with the sample.
6 Calculation
m1000-·100
Cu (%)=
Where: the volume of the copper standard solution consumed. ml, C copper standard solution concentration. mg·ml-\, m-sample weight. g.
Additional Notes:
This standard was proposed by the Electronic Standardization Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the 18th Institute of the Ministry of Machinery and Electronics Industry and the Electronic Standardization Institute of the Ministry of Machinery and Electronics Industry.
The main drafters of this standard: Qin Guozhen, Liu Chengjun. 2
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