USD $1.00-10.00 / Kilogram
we have gmp usp/ep standard
vitamin c(ascorbic acid)
characteristics |
white or almost white crystalline powder |
identification |
positive reaction |
melting point |
about 190℃ |
ph |
2.1-2.6 |
clarity of solution |
clear |
color of solution |
≤by2 |
copper |
≤ 5ppm |
heavy metals(lead) |
≤ 10ppm |
lead |
≤ 2ppm |
iron |
≤ 2ppm |
arsenic |
≤ 3ppm |
oxalic acid |
≤ 0.2% |
sulphated ash |
≤ 0.1% |
specific optical rotation |
+20.5°~+21.5° |
assay |
99.0%~100.5% |
organic volatile impurities |
pass |