This standard is applicable to the analysis of various grades of high-purity quartz sand.
SJ 3228.6-1989 history
2016SJ/T 3328.6-2016 High purity quartz sand for electronic products Part 6 Determination of copper
1989SJ 3228.6-1989 Determination of Copper in high purity arenaceous quartz
SJ 3228.6-1989 Determination of Copper in high purity arenaceous quartz was changed to SJ/T 3328.6-2016 High purity quartz sand for electronic products Part 6 Determination of copper.