| 摘要 |
The invention pertains to an aqueous solution of a sodium salt xNa<+> yH<+> of the chelating compound of formula (I): wherein x = 2.1 - 2.7, y = 0.9 - 0.3, and x + y = 3. The invention further pertains to a container comprising at least 0.5 kg of said aqueous solution and to a method of preparing an aqueous solution comprising at least 45wt% of the sodium salt xNa<+> yH<+> of the chelating compound of formula (I) from Na3-HEDTA, comprising the steps of electrodialysing an aqueous solution containing less than 42 wt% of Na3-HEDTA using a bipolar membrane, thereby converting the trisodium salt solution to the solution of the sodium salt of formula (I) with x = 2.1 - 2.7, y = 0.9 - 0.3, and x + y = 3. |
