| 摘要 |
Iron-contg. prepn used as an NMR contrast medium contains as essential components (1) an iron cmpd (01. - 10% wt, (0.5-5%) (as Fe)); (2) sodium and/or bi-carbonate (8 - 60%, (20-45%), and esp. 22-26% sodium carbonate or 20-45% sodium bicarbonate); (3) a neutralising agent (10 -70% (20-50%) and esp. 30-40%). Potassium carbonate may also be present as a preservative (0.2-12% wt, (0.3-3%) and esp. 0.4-1%). The prepn. is pref. an aq soln of pH 3- 5.5 (3.5 -4.6) but may be made up as dispersion for dilution or as tablets for dissolution before use. |
