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| Bread |
| Thickener |
| Acidulant |
| Preservative |
| Sweetener |
| Nutrition enhancer |
| Pharmaceutical |
| Food flavor |
| Phosphate |
| Starch |
|
Item
|
Index
|
|
|
|
Technical Grade
|
|
Food Grade
|
|
|
|
Special
|
First
|
|
|
Na2S2O5 % ≥
|
96.5
|
95.0
|
96.5
|
|
Iron (Fe) ≤
|
50ppm
|
100ppm
|
30ppm
|
|
Clear degree
|
—
|
—
|
Through the test
|
|
Water-fast material % ≤
|
0.05
|
0.05
|
—
|
|
Heavy metal(Pb) % ≤
|
—
|
—
|
5ppm
|
|
Arsenic(As) ≤
|
1ppm
|
—
|
1ppm
|