Potassium citrate (also known as tripotassium citrate) is a potassium salt of citric acid with the molecular formula K3C6H5O7. It is a white, hygroscopic crystaler. It is odorless with a sae. It contains 38.28% potassium by mass. In the monohydrate form it is highly hygroscopic and deliquescent.
As a food additive, potassium citrate is used to regulate acidity and is known as E E332. Medicinally, it may be used to control kidney stones derived from either uric acid or cystine.
| Name of index | GB14889-94 | BP93 | BP98 |
| Appearance | White or light yellow crystal or powder | White or light yellow crystal or powder | White or light yellow crystal or powder |
| Content(K3C6H5O7) >=% | 99.0 | 99.0-101.0 | 99.0-101.0 |
| Heavy metal(AsPb) =<% | 0.001 | 0.001 | 0.001 |
| AS =<% | 0.0003 | – | 0.0001 |
| Loss on drying % | 3.0-6.0 | – | – |
| Moisture% | – | 4.0-7.0 | 4.0-7.0 |
| Cl =<% | – | 0.005 | 0.005 |
| Sulte Salt =<% | – | 0.015 | 0.015 |
| Qxalate Salt =<% | – | 0.03 | 0.03 |
| Sodium =<% | – | 0.3 | 0.3 |
| Alkalinity | Accord with the test | Accord with the test | Accord with the test |
| Readily Carbonisable Substances | – | Accord with the test | Accord with the test |
| Transparenly and color of sample | – | Accord with the test | Accord with the test |
| Pyrogens | – | – | Accord with the test |
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