Test | Specification ACS grade |
Specification EP grade |
Specification Regular grade |
---|---|---|---|
Physical appearance | White crystals | White, colourless crystals, very deliquescent | White crystals |
Assay (by titrimetry) | 99.0 % min. | 98.0 to 100.5 % w/w min. | 99.0 % min. |
Chlorides | 20 ppm max. | 100 ppm max. | - |
Nitrates | 20 ppm max. | - | - |
Phosphates | 5 ppm max. | - | - |
Sulphates | 200 ppm max. | - | - |
Heavy metals (as Lead) | 20 ppm max. | - | - |
Substances darkened by H2SO4 |
Passes | - | - |
Iron | 10 ppm max. | - | - |
Residue on ignition (Ash) | 300 ppm max | - | - |
Insoluble matter | 100 ppm max | - | - |
Appearance of solution | - | Clear colourless | - |
Solubility | - | Very soluble in water, alcohol and methylene chloride | - |
Sulphated ash | - | 0.10% max | - |
Moisture content (by KF) |
- | - | 0.5% w/w max |
TRICHLOROACETIC ACID |