test item |
standard specification |
test date |
characters
|
white crystal or crystalline powder |
meet the requirement |
identification |
meet the requirement |
meet the requirement |
appearance of solution |
solution is clear and colourless |
solution is clear |
related substances |
any impurities not more than 0.1% |
0.033% |
the sum of impurities not more than 0.25% |
0.13% |
|
heavy metals |
≤20ppm |
<20ppm |
loss on drying |
≤0.5% |
0.17% |
sulphated ash |
≤0.1% |
0.04%
|
assay |
contains c9h8o4 99.5% - 101.0% |
99.58% |