1 . characteristic : colorless crystals or white crystals powder |
2 . normal characteristic
|
molecular formula :
C6 H 8 O 7 .H 2 O
molecular weight : 210
|
structural formula :
 |
3. quality standard : |
test item |
unit |
standard of BP98 edition |
standard of USP26 edition |
enterprise standard |
characteristic |
|
colorless crystalloid or white crystalline powder |
colorless crystalloid or white crystalline powder |
colorless crystalloid or white crystalline powder |
distinguish solubility |
|
pass the test |
pass the test |
pass the test |
transparency |
|
20% water solution transparent |
|
20% water solution transparent |
assay |
% |
99.5-101.0 |
99.5-100.5 |
99.65-100.5 |
moisture |
% |
<9.0,>7.5 |
 8.8
|
<8.8,>8.2 |
barium |
|
pass the test |
|
pass the test |
calcium |
PPM |
200 |
|
100 |
iron |
PPM |
50 |
|
5 |
arsenic |
PPM |
1 |
3 |
0.5 |
heavy metal |
PPM |
10 |
10 |
5 |
oxalic acid |
PPM |
350 |
pass the test |
100 |
chloride |
PPM |
50 |
|
25 |
sulphate |
PPM |
150 |
pass the test |
<150 |
readily carbureted substance |
|
less than stardard |
less than stardard |
less than stardard |
sulphated ash |
% |
0.1 |
0.05 |
0.04 |
organic volatilize foreign substance |
|
|
pass the test |
pass the test |
lead |
PPM |
|
|
2 |
