| Synonyms | Orthophosphoric acid |
| Monophosphoric acid |
| Definition | |
| Chemical name | Phosphoric acid |
| Einecs | 231-633-2 |
| Chemical formula | H3PO4 |
| Molecular weight | 98,0 |
| Assay | Phosphoric acid is commercially available as an aqueous solution at variable concentrations. Content not less than 67,0 % and not more than 85,7 %. |
| Description | Clear, colourless, viscous liquid |
| Identification | |
A.Positive tests for acid and for phosphate | |
| Purity | |
| Volatile acids | Not more than 10 mg/kg (as acetic acid) |
| Chlorides | Not more than 200 mg/kg (expressed as chlorine) |
| Nitrates | Not more than 5 mg/kg (as NaNO3) |
| Sulphates | Not more than 1 500 mg/kg (as CaSO4) |
| Fluoride | Not more than 10 mg/kg (expressed as fluorine) |
| Arsenic | Not more than 3 mg/kg |
| Cadmium | Not more than 1 mg/kg |
| Lead | Not more than 4 mg/kg |
| Mercury | Not more than 1 mg/kg |
| Note:
This specification refers to a 75 % aqueous solution
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