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Index name | Index | |||
Excellent grade | First grade | Qualified | ||
Gallic acid content(dry base)/(%) | ¡Ý | 99.0 | 98.5 | 98.0 |
Loss on drying/(%) | ¡Ü | 10.0 | 10.0 | 10.0 |
Ignition residue/(%) | ¡Ü | 0.1 | 0.1 | - |
Arsenic/(¦Ìg/g) | ¡Ü | 3 | 3 | - |
Water soluble test | clear | clear | - | |
Gallotannic acid test | clear | clear | - | |
Sulphate(S062-)(%) | ¡Ü | 0.01 | 0.02 | - |
Chloride(CL-)/(%) | ¡Ü | 0.01 | 0.02 | - |
Chroma | ¡Ü | 180 | 250 | - |
Turbidity(NTU) | ¡Ü | 10 |
food grade:
Index name | Index | |
Gallic acid content(dry base)/(%) | ¡Ý | 99.5 |
Loss on drying/(%) | ¡Ü | 10.0 |
Ignition residue/(%) | ¡Ü | 0.05 |
Water soluble test | clear | |
Gallotannic acid test | clear | |
Sulphate(S062-)(%) | ¡Ü | 0.005 |
Chloride(CL-)/(%) | ¡Ü | 0.001 |
Chroma | ¡Ü | 120 |
Turbidity(NTU) | ¡Ü | 5 |
Iron/(¦Ìg/g) | ¡Ü | 5 |
gallic acid